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Remote Sensing for Land & Resources    2020, Vol. 32 Issue (2) : 138-145     DOI: 10.6046/gtzyyg.2020.02.18
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A method for extracting alluvial fan based on DEM and remote sensing data
Kaixuan LIANG1,2, Guifang ZHANG1,2,3(), Haoran ZHANG1,2
1. School of Earth Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
2. Guangdong Provincal Key Lab of Geodynamics and Geohazards, Guangzhou 510275, China
3. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai),Zhuhai 519000, China
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Abstract  

Based on DEM and remote sensing data, this paper proposes a new method for extracting alluvial fan by determining the fan apex point, leading edge points and side edge points. Firstly, the fan apex point is determined by hydrological analysis. Secondly, the fan leading edge points are determined by DEM elevation fitting curve according to the obvious slope break at the boundary of alluvial fan and alluvial plain. Finally, the side edge points are interpreted by DEM elevation fitting curve and remote sensing data. Taking the eastern foot of Helan Mountain as a study case, the authors detected that the alluvial fans extracted by the proposed method are more objective and stable than visual interpretation from available studies. Moreover, this method can extract the alluvial fan more effectively under the complex condition with vegetation coverage and human activities, which is difficult for visual interpretation. The method is significant for alluvial fan extraction and also for the research on landform and sedimentary characteristics of alluvial fan.
Keywords alluvial fan      fan leading edge      fan apex      side edge      DEM      Helan Mountain     
:  TP751.1  
Corresponding Authors: Guifang ZHANG     E-mail: zhgfang@mail.sysu.edu.cn
Issue Date: 18 June 2020
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Kaixuan LIANG
Guifang ZHANG
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Kaixuan LIANG,Guifang ZHANG,Haoran ZHANG. A method for extracting alluvial fan based on DEM and remote sensing data[J]. Remote Sensing for Land & Resources, 2020, 32(2): 138-145.
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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020.02.18     OR     https://www.gtzyyg.com/EN/Y2020/V32/I2/138
Fig.1  Alluvial fan of predimont mountain and elevation profile
Fig.2  Technical routes of this study
Fig.3  Extraction of fan apex point
Fig.4  Extraction of fan leading edge points
Fig.5  Extraction of fanside edge points
Fig.6  Results of fan apex point,leading edge points and side edge points
Fig.7  Outline connection and smoothness of alluvial fan
Fig.8  Location and remote sensing image of test area
Fig.9  Extraction result at the eastern foot of Helan Mountains
扇名 编号 扇面积/km2 扇面宽长比 扇顶角/(°)
本文方法 文献[26] 文献[15] 本文方法 文献[26] 文献[15] 本文方法 文献[26] 文献[15]
大武口 1 56.30 54.46 — 0.83 1.16 — 72 67 —
鬼头沟 2 29.73 28.64 — 0.61 1.06 — 110 95 —
大风沟 3 20.39 23.56 — 1.14 1.09 — 125 86 —
汝箕沟 4 6.94 9.09 — 0.98 1.11 — 110 85 —
小水沟 5 6.54 7.25 — 1.48 1.55 — 115 90 —
大水沟 6 9.16 14.07 29.80 1.02 1.65 0.65 105 131 103
西伏沟 7 14.80 27.60 19.04 0.74 0.69 0.65 95 77 122
插旗口 8 48.90 54.32 49.07 0.95 0.79 0.82 105 108 88
贺兰口 9 25.99 32.52 25.87 0.84 0.61 0.75 142 144 143
苏峪口 10 24.62 40.26 29.55 0.56 0.51 0.48 90 87 98
黄旗口 11 32.69 33.01 31.93 0.78 0.74 0.68 142 138 153
甘沟 12 56.89 61.05 34.22 0.80 0.59 0.51 60 57 63
山咀沟 13 14.62 13.02 — 0.97 1.12 — 180 131 —
Tab.1  Results comparison of adopted method and visual interpretation from other two studies
Fig.10  Results comparison of three studies
Fig.11  Complex condition of Rujigou alluvial fan
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