Study on gully erosion distribution in Northeast black soil areas based on Pleiades
Taking Pleiades remote sensing image as data source,erosion gully distribution of dates of typical black soil area in Northeast in 2013 are obtained,and according to the 1 ∶ 10 000 digital elevation model(DEM) data of study area range,such as slope,aspect and slope-shape were extracted,and the erosion gully density and strength are discussed with the impact of topographical factors,and erosion gully contributions characteristics in typical black soil areas of Northeast are analyzed comprehensively.Results show that:(1) Distribution of erosion gully region in study area is uniform relatively,but in the Northeast,is more dense.Meanwhile,erosion gully distributes around the surrounding low-lying areas mostly.(2) Gully density and strength express first increase and then decrease on the whole with the increase of the slope.Within the range of 5 °～ 10 °,gully density and strength are highest.(3) In study area,erosion gully density and intensity of southwest,south,and southeast aspect is much larger than the other aspect,while gully density and strength of the Northeast and the north aspect is lowest.(4) Concave slope is the main in study area,and the probability of the erosion gully in concave slope is almost double in convex slope.In straight slope gully erosion has the lowest probability.Compared with convex slope,concave slope due to the role of water convergence,can lead to the convergence of the runoff,which lead to erosion easily.
topographical factorserosion gullydigital elevation modeltypical black soil area in Northeast
NETL
NSTL
万方数据
维普
