Analysis of Gully Erosion Development Based on LIDAR and GIS

The combination of LIDAR and GIS is an important method in the quantitative research of slopegully erosion of hill.In this study,the gully can be regarded as a composition of numerous sections,the variation characteristics of a plurality of continuous sections reflect the gully erosion development characteristics.Based on the soil loss data collected from 4events of individual rainfall experiments measured by LIDAR,we used the GIS desktop software to turn the data to DEM,and then extract the width and length by cross-section analysis.The results showed that the position of 3.5mto 5.5mwas the most active gully erosion site and the key position moved up as the rainfalls went on;the headwater erosion occurred in the early and medium term of the erosion,the collapse and erosion of the gully cliff were the main process.Cross-section analysis is an effective method to study the temporal and spatial patterns of gully erosion development,and provids a new way on the quantitative research of soil erosion.