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Soil erosion calculation in the hydro-fluctuation belt by adding water erosivity factor in the usle model

Journal of Mountain Science 2020年第9期17卷 2123-2135页

作者： XIN Zhi-yuan XIA Jian-guo College of Resources Sichuan Agricultural UniversityChengdu 611130China

Soils in the hydro-fluctuation belts of the reservoirs are most highly influenced by the special hydro-conditions and reservoir operation,leading to unique soil erosion process and largely accelerate soil erosion *** present study aimed to estimate soil erosion rate in the hydro-fluctuation belt of the Pubugou Reservoir,Southwest China,based on the framework of Universal Soil Loss Equation(usle).An attempt has been made to modify the original usle by including the reservoir water erosivity(W),a new factor into the *** erosion rate from different land use types were quantitatively estimated,using the usle and the modified usle *** observation showed that soil erosion rate in dry farmland,bare land and grassland was 4700,44600 and 5050 t/km2,*** erosion rate assessed by the modified usle was closely related to that recorded from the field monitoring *** findings of this study clearly highlight the importance of inclusion of the W factor to the original usle model while assessing soil erosion in the reservoir hydro-fluctuation belt.

关键词： modified usle Water erosivity Soil erosion Hydro-fluctuation belt Reservoir

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Assessment of soil erosion and sediment delivery ratio using remote sensing and GIS:a case study of upstream Chaobaihe River catchment, north China

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International Journal of Sediment Research 2008年第2期23卷 167-173页

作者： Weifeng ZHOU1 and Bingfang WU2 1 Doctor candidate,Graduate School of the Chinese Academy of Sciences(CAS),Beijing 100039,China 2 Prof.,Institute of Remote Sensing Applications,Chinese Academy of Sciences(CAS),Beijing 100101,China Doctor candidate Graduate School of the Chinese Academy of Sciences(CAS) Beijing 100039 China Prof. Institute of Remote Sensing Applications Chinese Academy of Sciences(CAS) Beijing 100101 China

Soil erosion in catchment areas reduces soil productivity and causes a loss of reservoir *** parametric models have been developed to predict soil erosion at drainage basins,hill slopes and field *** well-known Universal Soil Loss Equation(usle) represents a standardized *** reservoir,which sits on Chaobaihe River,is the main surface source of drinking water for Beijing,the capital of *** and soil loss are the main reasons for sediment to enter a *** yield is assessed using a version of the universal soil loss equation modified by Chinese *** year 2001 and 2002 data for factors in the equation are obtained from remote sensing or collected to form an analysis *** factors are computed and mapped using Geographic Information System *** on the complex database,the modified model is *** pixel-based computing the sediment yield per hydrological unit is *** model does not consider sediment deposition occurring on *** soil loss is often higher than the sum of those measured at catchment *** sediment delivery ratio(SDR) per hydrological unit is also *** study analyzes the main contributions of sediment yields on sub-basins of the Chaobaihe River to the Miyun Reservoir,and discusses the possible reasons for the difference between SDRs in 2001 and 2002 at different *** result shows that in the upper basin of the Miyun Reservoir,in 2001 the area of erosion that could be neglected was 8,202.76 km2,the area of low erosion 3,269.59 km2,the area of moderate erosion 3,400.97 km2,the area of high erosion 436.89 km2,the area of strong erosion 52.19 km2 and the area of severe erosion 3.13 *** highest soil loss was 70,353 t/*** in Fengning County in 2001,followed by 64,418 t/*** by Chicheng County in *** SDR in 2002 was lower than that in *** main reasons are the decreasing rainfall erosivity and total runoff.

关键词： modified usle Gross erosion Sediment delivery ratio

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