Small-Scale Flume Experiment to Investigate the Influence of Check Dam Opening on Upstream Deposition
Application of Directional Analysis Window in Geomorphometry
Influence of Landslides on Soil Erosion and Sediment Yield in a Watershed
52(4):205-217Chun-Ting Chang Ching-Nuo Chen Chin-Yu Lee  Yi-Lung Yeh
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|Influence of Landslides on Soil Erosion and Sediment Yield in a Watershed|
|Chun-Ting Chang Ching-Nuo Chen Chin-Yu Lee  Yi-Lung Yeh|
Landslides are one of the main reasons for the soil erosion of a watershed and increases in sediment yield. To explore the effects of landslides on soil erosion and sediment yield, a physiographic soil erosion–deposition model was used in conjunction with a Geographic Information System to simulate soil erosion and sediment yield caused by the typhoon rainfall events and heavy rainfall. The results indicated that the soil erosion and sediment yield
of landslide areas were both significantly higher than those of areas without landslides by 1.1-7.7 and 1.3-9.1 times,
respectively. The trend of increasing soil erosion and sediment yield is consistent with change in the trend of the landslide ratio in the watershed. Although the distribution of soil erosion areas had a similar trend in areas influenced and not influenced by landslide, the depth of erosion in landslide areas was more severe. According to area statistics on erosion depth, compared with the area without landslide, the area of erosion depth of <0.5 cm is reduced; landslide ratio and erosion depth increase with an increase in accumulated rainfall. The total area of erosion did not increase, but the erosion depth increased. The results from the study will aid management units in the development of reference adaptation strategies.
Key Words: Landslide Ratio, Physiographic Soil Erosion–Deposition Model, Soil Erosion, Sediment Yield
〔1〕Department of Soil and Water Conservation, National Pingtung University of Science and Technology, Pingtung, Taiwan, R.O.C.
〔2〕Department of Tropical Agriculture and International Cooperation, National Pingtung University of Science and Technology, Pingtung, Taiwan,
〔3〕Department of Civil Engineering, National Pingtung University of Science and Technology, Pingtung, Taiwan, R.O.C.
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Modeling of Soil Quality for Assessing Soil Health: Improving Soil Functions Its Sustainability
Case Studies for the Investigation of Large-scale Potential Landslides
52(4):231-240Chia-Hao Lu Jia-Tung Chen* Ching-Hui Huang Chao-Chin Pai Zhong-Fu Xiao
Ming-Yan Li Zhi-Wei Huang Chia-Wei Wu Fang-Tzu Kuo
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Disaster Prevention Education for Soil and Water Conservation: A Case Study on Large-scale Landslide Disaster Prevention