STUDY ON SOIL EROSION USING REMOTE SENSING TECHNIQUE IN THE LOESS PLATEAU OF THE NORTH SHAANXI PROVINCE

摘要

This paper introduces the study on soil erosion in the Loess Plateau of the North Shaanxi province using remote sensing data in two parts. The first part introduces the manners, process and results of surveying and mapping the types and intensity of soil erosion using landsat TM images on the scale of 1:100 000. Through surveying and mapping, 7 intensity grades and 46 types of soil erosion are devided, and their spatial distribution characteristics have been found out. The second one introduces a new model of soil erosion for predicting the amount of water erosion in small watersheds using aerial photos. The model is set up on the base of the Grey System Theory and the data of many years in six typical watersheds. According to the principle of dynamics of soil erosion and the evolution features of motive force in the erosive process. 7 factors are elected, and their data are obtained from aerial photos on the scale of 1: 10000 as far as possible. The model has concise form and good accuracy with only 7.48percent mean relative error and can be used to estimate the intensity of water erosion types and to provide reference basis for the plan of water and soil conservation.