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xvii | |
Preface to the first edition |
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xix | |
Preface to the second edition |
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xxi | |
Preface to the third edition |
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xxiii | |
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I Large-scale controls and variability in drylands |
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1 | (82) |
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1 Arid environments: their nature and extent |
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3 | (14) |
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1.1 Geomorphology in arid environments |
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3 | (1) |
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1.2 Arid zone distinctiveness and the quest for explanation |
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4 | (1) |
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1.3 Arid zones: terminology and definitions |
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5 | (2) |
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5 | (1) |
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5 | (2) |
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1.4 The age of aridity on Earth |
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7 | (1) |
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1.5 The distribution of arid zones |
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8 | (1) |
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9 | (1) |
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1.6.1 Atmospheric stability |
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9 | (1) |
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9 | (1) |
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9 | (1) |
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1.6.4 Cold ocean currents |
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10 | (1) |
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10 | (1) |
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10 | (2) |
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1.8.1 Arid zone geomorphology |
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12 | (1) |
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1.9 Arid zone geomorphology and people |
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12 | (1) |
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1.10 Organisation of this book |
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13 | (4) |
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14 | (3) |
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17 | (10) |
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17 | (1) |
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2.2 Tectonic setting of drylands |
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18 | (1) |
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2.3 Uplift and erosion, subsidence and sedimentation |
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18 | (2) |
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20 | (1) |
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2.5 Existing erosional and depositional records in arid environments |
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21 | (2) |
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2.5.1 Drainage patterns and fluvial systems |
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21 | (1) |
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22 | (1) |
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22 | (1) |
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23 | (1) |
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2.6 Selected examples of the geomorphological impact of active tectonics in arid environments |
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23 | (1) |
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2.6.1 Tectonic disruption of fluvial systems |
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23 | (1) |
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2.6.2 Tectonic controls on alluvial sedimentation |
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23 | (1) |
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24 | (3) |
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24 | (3) |
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3 Climatic frameworks: legacies from the past |
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27 | (26) |
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27 | (1) |
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3.2 The significance of arid zone fluctuations in the past |
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27 | (12) |
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27 | (1) |
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3.2.2 The development of aridity in the Mesozoic and Cenozoic |
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28 | (1) |
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3.2.3 The Quaternary Period |
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29 | (1) |
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3.2.4 Sedimentary records |
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29 | (3) |
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3.2.5 Marine sediments and palaeoaridity |
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32 | (2) |
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34 | (1) |
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3.2.7 Geomorphological evidence of arid zone change |
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35 | (1) |
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3.2.8 Arid zone contraction |
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36 | (2) |
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3.2.9 Ecological evidence |
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38 | (1) |
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3.3 Dating arid zone fluctuations |
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39 | (1) |
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3.4 Climatic interpretations and issues |
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39 | (4) |
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3.4.1 Aridity during glacial times? |
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41 | (1) |
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3.4.2 Drivers of late glacial tropical aridity |
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42 | (1) |
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43 | (10) |
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44 | (9) |
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4 Dryland system variability |
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53 | (8) |
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4.1 A framework for dryland diversity |
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53 | (2) |
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4.2 Geomonotony: how unvarying are the `flat' drylands of the world? |
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55 | (2) |
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4.3 Within-dryland diversity |
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57 | (1) |
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58 | (3) |
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59 | (2) |
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5 Extraterrestrial arid surface processes |
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61 | (22) |
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61 | (1) |
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5.2 What does `aridity' mean beyond Earth? |
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61 | (1) |
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5.3 Why should planetary scientists understand terrestrial arid geomorphology? |
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62 | (1) |
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5.4 What can terrestrial geomorphologists learn from a solar system perspective? |
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63 | (1) |
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5.5 Mars: water-based aridity |
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64 | (8) |
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64 | (1) |
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5.5.2 The history of atmosphere--surface interactions |
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64 | (2) |
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5.5.3 Martian water cycle |
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66 | (1) |
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66 | (2) |
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5.5.5 The geomorphology of Mars |
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68 | (4) |
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72 | (1) |
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5.6 Titan: methane-based aridity? |
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72 | (4) |
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73 | (1) |
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74 | (1) |
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74 | (1) |
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5.6.4 Rock breakdown: process and form |
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75 | (1) |
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75 | (1) |
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75 | (1) |
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76 | (1) |
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5.7 Venus: extreme aridity |
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76 | (3) |
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5.7.1 Surface--atmosphere interaction |
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76 | (1) |
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76 | (1) |
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77 | (1) |
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78 | (1) |
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79 | (1) |
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79 | (4) |
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79 | (4) |
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II Surface processes and characteristics |
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83 | (152) |
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85 | (16) |
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85 | (2) |
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6.2 What makes arid environments unusual in terms of weathering systems? |
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87 | (1) |
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6.3 Theoretical underpinnings of weathering systems research |
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88 | (2) |
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6.4 Current weathering study methods |
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90 | (2) |
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6.5 Linking processes to form in arid weathering systems |
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92 | (3) |
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6.6 Explaining the development of weathering landforms in arid environments |
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95 | (2) |
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6.7 Weathering rates in arid environments |
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97 | (1) |
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6.8 Arid weathering and landscape evolution |
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97 | (1) |
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6.9 Scale and arid weathering systems |
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98 | (3) |
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98 | (1) |
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98 | (3) |
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101 | (30) |
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7.1 Introduction: the nature and significance of desert soils |
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101 | (2) |
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7.2 Taxonomy of desert soils |
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103 | (1) |
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7.2.1 A note on terminology of near-surface features in desert soils |
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104 | (1) |
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7.3 Some distinctive aspects of desert soil development |
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104 | (1) |
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7.4 Stone-mantled surfaces and desert pavements |
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105 | (1) |
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7.5 Inorganic seals at the soil surface |
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106 | (15) |
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7.5.1 Raindrop properties and raindrop impact seals |
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106 | (3) |
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7.5.2 Factors known to be significant in the formation of raindrop impact seals |
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109 | (1) |
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109 | (1) |
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7.5.4 Effects of seals on infiltration and erosion |
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110 | (1) |
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7.5.5 Biological soil crusts |
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111 | (1) |
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7.5.6 The habitats or niches exploited by microphytic plants in drylands |
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112 | (1) |
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7.5.7 The organisms forming biological soil crusts |
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113 | (1) |
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7.5.8 The classification of biological soil crusts |
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114 | (1) |
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7.5.9 Effects of biological soil crusts on infiltration and overland flow |
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115 | (4) |
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7.5.10 Effects of biological crusts on soil stability and erosion resistance |
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119 | (2) |
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7.5.11 Possible effects of climate change on biological soil crusts |
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121 | (1) |
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7.6 Vesicular soil structures |
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121 | (4) |
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7.6.1 Comparing the infiltrability of biological, raindrop impact and vesicular surfaces |
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122 | (1) |
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7.6.2 Spatial heterogeneity of desert soils |
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123 | (2) |
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125 | (6) |
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125 | (6) |
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8 Desert crusts and rock coatings |
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131 | (50) |
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131 | (1) |
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8.2 Sodium nitrate deposits |
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132 | (3) |
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8.2.1 General characteristics and distribution |
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132 | (1) |
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8.2.2 Micromorphology, chemistry and mode of formation |
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133 | (2) |
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135 | (2) |
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8.3.1 General characteristics and distribution |
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135 | (1) |
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8.3.2 Micromorphology and chemistry |
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136 | (1) |
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137 | (1) |
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137 | (4) |
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8.4.1 General characteristics |
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137 | (2) |
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139 | (1) |
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8.4.3 Micromorphology and chemistry |
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140 | (1) |
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140 | (1) |
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141 | (10) |
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8.5.1 General characteristics |
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141 | (2) |
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143 | (3) |
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8.5.3 Micromorphology and chemistry |
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146 | (2) |
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148 | (3) |
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151 | (7) |
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8.6.1 General characteristics |
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151 | (1) |
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152 | (1) |
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8.6.3 Micromorphology and chemistry |
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153 | (3) |
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156 | (2) |
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158 | (5) |
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8.7.1 General controls on formation |
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158 | (1) |
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159 | (3) |
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8.7.3 Silica glazes and iron films |
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162 | (1) |
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8.8 Palaeoenvironmental significance of crusts |
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163 | (18) |
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165 | (16) |
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9 Pavements and stone mantles |
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181 | (28) |
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181 | (1) |
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9.2 Surface types: hamadas and stony surfaces |
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181 | (4) |
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181 | (1) |
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9.2.2 Stony surfaces: gobi, serir, gibber plains and desert pavements |
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182 | (3) |
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9.3 General theories concerning stony surface formation |
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185 | (4) |
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186 | (1) |
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9.3.2 Concentration by surface wash and rain splash |
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186 | (1) |
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9.3.3 Upward migration of stones |
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187 | (1) |
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9.3.4 Accretion of aeolian fines |
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188 | (1) |
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9.3.5 Desert pavement formation by aeolian aggradation and development of an accretionary mantle |
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188 | (1) |
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9.4 Stone pavement characteristics |
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189 | (1) |
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189 | (1) |
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9.4.2 Surface clast concentration and characteristics |
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189 | (1) |
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9.5 Processes of pavement formation |
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190 | (2) |
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9.6 Processes of clast size reduction in pavements |
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192 | (2) |
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192 | (2) |
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9.7 Secondary characteristics of pavement surfaces and regional differences in pavement formation |
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194 | (1) |
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9.7.1 Presence of calcium carbonate and carbonate collars |
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194 | (1) |
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194 | (1) |
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9.7.3 Development of varnish |
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194 | (1) |
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194 | (1) |
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195 | (1) |
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195 | (1) |
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9.7.7 Development of ventifacted surfaces |
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195 | (1) |
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9.8 Secondary modifications to pavement surfaces |
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195 | (3) |
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9.8.1 Patterns in pavement |
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195 | (1) |
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9.8.2 Animal burrowing, vegetation and stone displacement |
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195 | (2) |
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9.8.3 Regeneration of surfaces by rainfall and runoff events |
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197 | (1) |
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198 | (1) |
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9.8.5 Off-road vehicle disturbance |
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198 | (1) |
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9.8.6 Removal of stones for agriculture |
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198 | (1) |
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9.9 Ecohydrology of pavement surfaces |
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198 | (2) |
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9.9.1 Infiltration in pavements and runoff potential |
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199 | (1) |
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9.9.2 Ecohydrologic relationships and vegetation associations |
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199 | (1) |
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9.10 Relative and absolute dating of geomorphic surfaces based on pavement development |
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200 | (2) |
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9.10.1 Changes in surface characteristics |
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200 | (1) |
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9.10.2 Pavement characteristics and geomorphic surface ages |
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201 | (1) |
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9.10.3 Pavement surfaces as a tool in geomorphic assessment |
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201 | (1) |
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202 | (7) |
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204 | (5) |
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209 | (26) |
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209 | (3) |
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10.1.1 Contexts of slope systems |
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209 | (3) |
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212 | (10) |
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10.2.1 Processes and rates of badland evolution |
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219 | (3) |
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222 | (6) |
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10.3.1 Bare rock or slick-rock slopes |
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222 | (4) |
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10.3.2 Distinctive landforms of rock- and debris-mantled slopes |
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226 | (2) |
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228 | (7) |
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229 | (6) |
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235 | (190) |
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11 Runoff generation, overland flow and erosion on hillslopes |
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237 | (32) |
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237 | (3) |
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11.2 Infiltration processes |
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240 | (1) |
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11.3 Factors affecting infiltration |
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241 | (7) |
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11.3.1 Controls at the surface--atmosphere interface |
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241 | (5) |
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11.3.2 Subsurface controls |
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246 | (2) |
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248 | (6) |
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11.4.1 Ponding and surface storage |
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248 | (2) |
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250 | (2) |
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11.4.3 Pipes and macropore flow |
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252 | (1) |
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11.4.4 Scales of overland flow |
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252 | (2) |
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11.5 Erosion processes on hillslopes |
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254 | (5) |
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255 | (1) |
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11.5.2 Unconcentrated overland-flow erosion |
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256 | (1) |
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11.5.3 Concentrated overland-flow erosion |
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256 | (3) |
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11.5.4 Patterns and scales of sediment transport |
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259 | (1) |
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259 | (10) |
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259 | (10) |
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12 Distinctiveness and diversity of arid zone river systems |
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269 | (32) |
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269 | (1) |
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12.2 Distinctiveness of dryland rivers |
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270 | (3) |
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12.3 Diversity of dryland rivers |
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273 | (16) |
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12.3.1 Higher energy dryland rivers: the Mediterranean region |
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274 | (6) |
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12.3.2 Moderate and lower energy dryland rivers: southern Africa |
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280 | (4) |
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12.3.3 Lower energy dryland rivers: Australia |
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284 | (5) |
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12.4 Reassessing distinctiveness and diversity |
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289 | (4) |
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12.4.1 Downstream flow decreases and localised flood patterns |
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291 | (1) |
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12.4.2 Induration of alluvial sediments |
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291 | (2) |
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12.4.3 Channel--vegetation interactions |
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293 | (1) |
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12.4.4 Fluvial--aeolian interactions |
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293 | (1) |
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293 | (8) |
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294 | (7) |
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13 Channel form, flows and sediments of endogenous ephemeral rivers in deserts |
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301 | (32) |
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301 | (1) |
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13.2 Rainfall and river discharge |
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302 | (7) |
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13.2.1 Storm characteristics |
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302 | (2) |
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13.2.2 Flash flood hydrograph |
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304 | (1) |
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13.2.3 Transmission losses |
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305 | (2) |
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13.2.4 Drainage basin size and water discharge |
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307 | (2) |
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13.3 Ephemeral river channel geometry |
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309 | (2) |
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309 | (1) |
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13.3.2 Channel bed morphology |
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309 | (2) |
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13.4 Fluvial sediment transport |
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311 | (9) |
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311 | (3) |
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13.4.2 Sediment transport in suspension |
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314 | (3) |
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13.4.3 Sediment transport along the stream bed |
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317 | (3) |
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13.5 Desert river deposits |
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320 | (4) |
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321 | (1) |
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13.5.2 Predominance of horizontal lamination in sand beds |
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322 | (2) |
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13.5.3 Mud drapes and mud intraclasts |
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324 | (1) |
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324 | (9) |
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327 | (6) |
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333 | (40) |
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14.1 Introduction: dryland alluvial fans -- an overview |
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333 | (5) |
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14.1.1 Definitions, local occurrence, general morphology |
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333 | (1) |
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14.1.2 Global occurrence and distribution of dryland alluvial fans |
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334 | (4) |
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14.1.3 The role of alluvial fans within dryland fluvial systems |
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338 | (1) |
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14.2 Process and form on dryland alluvial fans |
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338 | (7) |
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14.2.1 Sediment supply, transport and depositional processes |
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338 | (2) |
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14.2.2 Post-depositional modification of dry region fan surfaces |
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340 | (2) |
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14.2.3 Alluvial fan sediment sequences and spatial variations |
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342 | (3) |
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14.2.4 Alluvial fan morphology and style |
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345 | (1) |
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14.3 Factors controlling alluvial fan dynamics |
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345 | (13) |
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14.3.1 Passive factors: influence on fan morphology |
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347 | (4) |
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351 | (7) |
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14.4 Alluvial fan dynamics |
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358 | (4) |
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14.4.1 Expressions of fan dynamics |
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358 | (1) |
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14.4.2 Interactions between the dynamic controls: case studies of alluvial fan response to Late Quaternary environmental change |
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358 | (4) |
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14.5 Discussion: significance of dry-region alluvial fans |
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362 | (11) |
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14.5.1 Commonly held myths and outdated concepts |
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362 | (1) |
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14.5.2 Significance to science |
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362 | (1) |
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14.5.3 Significance of dry-region alluvial fans for society |
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363 | (1) |
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364 | (1) |
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364 | (9) |
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15 Pans, playas and salt lakes |
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373 | (30) |
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15.1 The nature and occurrence of pans, playas and salt lakes |
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373 | (6) |
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15.1.1 Play a and pan terminology |
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374 | (1) |
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15.1.2 General characteristics |
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374 | (2) |
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15.1.3 Origins and development of pans and playas |
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376 | (3) |
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15.2 Pan hydrology and hydrochemistry |
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379 | (7) |
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15.2.1 Inflow and water balance modelling |
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380 | (2) |
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15.2.2 Geochemical processes and mineral precipitation |
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382 | (2) |
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15.2.3 The importance of groundwater: classification of playa and pan types |
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384 | (1) |
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15.2.4 Implications of climate change and human impacts on playa hydrology |
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385 | (1) |
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15.3 Influences of pan hydrology and hydrochemistry on surface morphology |
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386 | (3) |
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386 | (2) |
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15.3.2 Surface dynamics: mapping pan surface morphologies using remote sensing |
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388 | (1) |
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15.4 Aeolian processes in pan environments |
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389 | (5) |
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15.4.1 Wind action on the pan surface |
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391 | (1) |
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15.4.2 The emission of fine panicles (dust): process and controls |
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391 | (1) |
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392 | (2) |
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394 | (1) |
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15.5 Pans and playas as palaeoenvironmental indicators |
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394 | (9) |
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15.5.1 Identification and dating of pan shorelines |
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394 | (1) |
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15.5.2 Dating and stratigraphy of lunette dunes |
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394 | (1) |
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15.5.3 Stable isotope studies and pan hydrochemical evolution |
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395 | (1) |
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395 | (8) |
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16 Groundwater controls and processes |
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403 | (22) |
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403 | (1) |
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16.2 Groundwater processes in valley and scarp development |
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404 | (9) |
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16.2.1 Erosion by exfiltrating water: definitions and mechanisms |
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404 | (1) |
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16.2.2 Seepage erosion and valley formation |
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404 | (4) |
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16.2.3 Characteristics of drainage networks developed by groundwater seepage erosion |
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408 | (3) |
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16.2.4 Parameters promoting the operation of groundwater seepage erosion processes |
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411 | (1) |
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16.2.5 Groundwater seepage erosion and environmental change |
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411 | (1) |
|
16.2.6 In situ deep-weathering and valley development |
|
|
412 | (1) |
|
16.3 Groundwater and pan/playa development |
|
|
413 | (1) |
|
16.4 Groundwater and aeolian processes |
|
|
414 | (11) |
|
|
418 | (7) |
|
|
425 | (144) |
|
17 Aeolian landscapes and bedforms |
|
|
427 | (28) |
|
|
|
427 | (1) |
|
17.2 Aeolian bedforms: scales and relationships |
|
|
427 | (3) |
|
17.2.1 Scale effects in aeolian bedform development |
|
|
430 | (1) |
|
17.3 The global distribution of sand seas |
|
|
430 | (7) |
|
17.3.1 Sand sea development |
|
|
432 | (1) |
|
17.3.2 Sediment supply in sand seas |
|
|
432 | (3) |
|
17.3.3 Sandflow conditions and sand sea development |
|
|
435 | (1) |
|
|
435 | (2) |
|
17.4 The global distribution of loess |
|
|
437 | (2) |
|
17.4.1 Loess production and distribution |
|
|
437 | (1) |
|
|
437 | (2) |
|
17.5 Dynamic aeolian landscapes in the Quaternary period |
|
|
439 | (9) |
|
17.5.1 Dating aeolian landscape change |
|
|
443 | (5) |
|
|
448 | (7) |
|
|
448 | (7) |
|
18 Sediment mobilisation by the wind |
|
|
455 | (32) |
|
|
|
455 | (1) |
|
18.2 The nature of windflow in deserts |
|
|
456 | (8) |
|
18.2.1 The turbulent velocity profile |
|
|
456 | (1) |
|
18.2.2 Measuring shear velocity (u) and wind stress |
|
|
457 | (3) |
|
18.2.3 Measuring aerodynamic roughness (z0) |
|
|
460 | (2) |
|
18.2.4 The effect of nonerodible roughness elements on velocity profiles |
|
|
462 | (2) |
|
|
464 | (2) |
|
|
464 | (2) |
|
18.4 Determining the threshold of grain entrainment |
|
|
466 | (2) |
|
18.5 Surface modifications to entrainment thresholds and transport flux |
|
|
468 | (3) |
|
|
468 | (1) |
|
|
469 | (1) |
|
|
469 | (2) |
|
18.6 Modes of sediment transport |
|
|
471 | (2) |
|
|
471 | (1) |
|
|
471 | (1) |
|
|
472 | (1) |
|
|
472 | (1) |
|
|
473 | (2) |
|
|
474 | (1) |
|
18.8 Prediction and measurement of sediment flux |
|
|
475 | (3) |
|
18.9 The role of turbulence in aeolian sediment transport |
|
|
478 | (1) |
|
|
479 | (8) |
|
|
479 | (8) |
|
19 Desert dune processes and dynamics |
|
|
487 | (30) |
|
|
|
487 | (1) |
|
19.2 Desert dune morphology |
|
|
487 | (1) |
|
19.3 Dune types and environments |
|
|
487 | (7) |
|
|
487 | (3) |
|
|
490 | (4) |
|
|
494 | (1) |
|
|
494 | (1) |
|
19.3.5 Zibars and sand sheets |
|
|
494 | (1) |
|
|
494 | (3) |
|
19.4.1 The stoss or windward slope |
|
|
495 | (2) |
|
|
497 | (1) |
|
|
497 | (5) |
|
19.5.1 Erosion and deposition patterns on dunes |
|
|
497 | (3) |
|
19.5.2 Long-term dune dynamics |
|
|
500 | (2) |
|
|
502 | (1) |
|
19.7 Controls of dune morphology |
|
|
503 | (6) |
|
19.7.1 Sediment characteristics |
|
|
503 | (1) |
|
|
503 | (1) |
|
|
504 | (1) |
|
|
505 | (1) |
|
19.7.5 Controls of dune size and spacing |
|
|
505 | (3) |
|
|
508 | (1) |
|
|
509 | (2) |
|
|
511 | (6) |
|
|
511 | (6) |
|
|
517 | (22) |
|
|
|
|
517 | (9) |
|
20.1.1 Dust in a geomorphological context |
|
|
517 | (5) |
|
|
522 | (2) |
|
|
524 | (1) |
|
20.1.4 Distribution of dust |
|
|
525 | (1) |
|
|
526 | (6) |
|
20.2.1 Bodele Depression, Chad |
|
|
526 | (2) |
|
20.2.2 Saharan Empty Quarter |
|
|
528 | (2) |
|
|
530 | (1) |
|
20.2.4 Southern Africa and Australia |
|
|
531 | (1) |
|
20.3 Temporal changes in dust |
|
|
532 | (1) |
|
20.3.1 Observational record |
|
|
532 | (1) |
|
20.4 Future climate change |
|
|
532 | (1) |
|
|
532 | (7) |
|
|
533 | (6) |
|
21 Wind erosion in drylands |
|
|
539 | (30) |
|
|
|
539 | (1) |
|
21.2 The physical setting: conditions for wind erosion |
|
|
540 | (24) |
|
21.2.1 Processes of aeolian erosion |
|
|
540 | (1) |
|
|
541 | (4) |
|
21.2.3 Yardang formative processes |
|
|
545 | (8) |
|
21.2.4 Inverted topography |
|
|
553 | (1) |
|
|
553 | (11) |
|
|
564 | (5) |
|
|
564 | (5) |
|
V Living with dryland geomorphology |
|
|
569 | (42) |
|
|
571 | (12) |
|
|
|
571 | (1) |
|
22.2 Human impacts on soils |
|
|
571 | (5) |
|
22.2.1 Terracing and rainwater harvesting |
|
|
571 | (2) |
|
22.2.2 Irrigated agriculture |
|
|
573 | (1) |
|
22.2.3 Accelerated erosion |
|
|
574 | (1) |
|
|
575 | (1) |
|
22.3 Human impacts on sand dunes |
|
|
576 | (1) |
|
22.4 Human impacts on rivers |
|
|
576 | (2) |
|
|
576 | (1) |
|
|
577 | (1) |
|
22.4.3 Changes in vegetation |
|
|
578 | (1) |
|
22.5 Cause and effect: the arroyo debate continues |
|
|
578 | (1) |
|
|
579 | (4) |
|
|
579 | (4) |
|
23 Geomorphological hazards in drylands |
|
|
583 | (16) |
|
|
|
583 | (1) |
|
|
583 | (3) |
|
23.2.1 Blowing sand and active dune movement |
|
|
583 | (2) |
|
23.2.2 Human disturbance of stable surfaces |
|
|
585 | (1) |
|
23.3 The aeolian dust hazard |
|
|
586 | (1) |
|
23.4 Agricultural wind erosion |
|
|
587 | (2) |
|
23.5 Drainage of inland water bodies |
|
|
589 | (4) |
|
|
593 | (1) |
|
|
594 | (5) |
|
|
595 | (4) |
|
24 Future climate change and arid zone geomorphology |
|
|
599 | (12) |
|
|
|
|
599 | (1) |
|
24.2 Climate change projections: basis and uncertainties |
|
|
599 | (1) |
|
24.3 Overview of global climate change projections in the context of arid zones |
|
|
600 | (3) |
|
24.3.1 Methods of establishing climate change impacts in arid zones |
|
|
602 | (1) |
|
24.4 Climate change and dunes |
|
|
603 | (2) |
|
24.5 Climate change and dust |
|
|
605 | (2) |
|
24.6 Climate change and fluvial systems |
|
|
607 | (1) |
|
|
607 | (4) |
|
|
608 | (3) |
Index |
|
611 | |