摘要
根据动力学原理选取了产流雨量(R)、沙比系数(S)、沟道密度(L)、陡壁密度(W)、比表面积(F)、人口密度(P)和治理率(C)共7个影响土壤侵蚀的因子,并尽可能地利用遥感信息获取其量化数据。采用灰色系统理论,建立了黄土丘陵沟壑区流域土壤侵蚀的灰色系统模型:(?)s=RS(0.296 23L+0.40337W+10.1478F)-0.283C-151本模型平均相对误差7.48%,最大相对误差12.38%,形式简明,适应性较广,可用于定量研究试验小流域各侵蚀类型强度。结果表明,研究区内面蚀侵蚀量最大,沟蚀次之,重力侵蚀最小,分别占总量的46.8%,35.1%和18.1%。
This paper deals with a new method to form a model of soil erosion in the watershed with remote sensing information and grey sys- tem theory.According to the dynamics principle of soil erosion,the study selects runoff-producing rainfall,the coefficient of sand to silt in the loess,gully density,cliff density,the ratio of level projection area to its surface area,population density,the ratio of harnessed area to the whole area of the watershed which related to the soil erosion,as the factors, and obtains their data from remote sensing information as far as possible. The soil erosion model for the hilly and gullied region in the loess plateau had been set up using grey system theory as follow, M_S=RS(0.29623L+0.40337W+10.1478F)-0.283C-151 The model is concise in form,the relative error in average of the results is 7.48%,and the largest is 12.38%.It could be used widely to forecast soil erosion.Using the model conclusion might be gotten in the studied watershed,that is,erosion amount by surface erosion is the greatest (46.8%),gully erosion the greater(35.1%)and gravity erosion Lhe least (18.1%).
出处
《水土保持学报》
CSCD
北大核心
1991年第1期27-32,共6页
Journal of Soil and Water Conservation
关键词
土壤侵蚀
产流雨量
灰色系统
soil erosion
runoff-producing rainfall
grey system
