Erosion Hazard Index of a Small Catchment in the Loess Plateau Based on Terrain Analysis
The Loess Plateau, with its heavily soil erosion, is limited in water resources and sensitive to hydrological environments. The eco-hydrological model TOPOG uses a sophisticated analysis of topography to describe the hydrological characteristics of a catchment in detail. This paper describes an integrated terrain analysis and steady-state hydrological modeling study of a small catchment on the Lvergou watershed, Loess Plateau China using TOPOG. The terrain analysis was based on a DEM (digital elevation model). The topographic attributes of each element, which included slope, aspect, upslope contributing area, and potential incident solar radiation, were calculated automatically. By setting different parameters, the results of steady-state simulation illustrated that the mapped distribution of Py (variable excess stream power index) and H (erosion hazard index) varied as a consequence of these different data inputs. Pv increased with an increase in uniform rainfall excess rate (Q); A comparison was made between a set of uniform Q and uniform fraction of soil exposed rainfall (Cr) values, and TOPOG was found to predict the expected trend that erosion hazard within the catchment increased with increasing uniform Q and uniform Cr values, and H increased sharply in the case of higher Q and Cr.
TOPOG model variable excess stream power index erosion hazard index terrain analysis Loess Plateau
LI Hai-guang YU Xin-xiao XIN Zhong-bao LV Xi-zhi
Key Laboratory of Soil and Water Conservation & Combating Desertification of Ministry of Education, School of Water and Soil Conservation Beijing Forest Universitv Beijing 100083.P.R.China
国际会议
西安
英文
679-683
2010-10-11（万方平台首次上网日期，不代表论文的发表时间）