Dynamic Analysis Of Soil Erosion In Huairou District,Beijing Based On Remote Sensing

In recent years,China’s ecological and environmental protection has still focused on soil erosion.The area of soil erosion still accounts for more than a quarter of China’s land area.The area is widely distributed and comprehensive management is difficult.As the capital of China,Beijing’s soil erosion status cannot be ignored.The main type of soil erosion in Beijing is hydraulic erosion.Based on the Beijing Soil Loss Equation(BJSLE),combined with GIS and RS,the paper uses 2010,2015,and 2019 as the research years to quantitatively analyze the situation and spatial pattern distribution of soil erosion in Huairou District,Beijing from 2010 to 2019.Dynamic analysis of water and soil loss in the district,and find out the influencing factors that lead to the change of water and soil loss in Huairou District from the discharge,elevation,and slope,and analyze the distribution law and characteristics of water and soil loss in Huairou District.The main research results of the thesis are as follows:Obtain the calculation method of the six factors in the Beijing soil loss equation applicable to the study area and analyze the distribution characteristics,and multiply the six factors in the soil erosion model in Arc GIS to obtain the soil erosion intensity classification of the study area in 2010,2015,and 2019.Figure,analysis of the temporal and spatial distribution characteristics of soil erosion through the transfer matrix.The results show that the spatial distribution characteristics of topographic factors are more significant,consistent with the overall topography of the study area,and the value of the soil and water conservation engineering measures of cultivated land is positively correlated with the slope length and slope factor;from 2010 to 2019,the annual average soil of the study area The erosion intensity is in the category of mild erosion,the area of soil erosion is gradually decreasing,and the area of strong erosion,extreme erosion,and severe erosion has a significant decline rate,and the situation of soil erosion is showing a positive trend.The SCS-CN runoff generation model was introduced to analyze the impact of the runoff rate on the dynamic changes of soil erosion.The soil erosion intensity classification maps in 2010,2015,and 2019 were spatially superimposed with the elevation and slope classification maps of the study area to analyze the geography.The influence of factors on the dynamic changes of soil erosion in the study area.The results show that: different erosion levels have different changes as the flow rate increases.The middle runoff areas are more likely to produce soil erosion.Measures such as returning farmland to forests should be taken in the middle runoff areas to reduce runoff and achieve the purpose of reducing soil erosion;The area of soil erosion under different elevations in the study area is decreasing year by year.Soil erosion is mainly distributed in the area with an elevation of200 m-1000 m,and more concentrated in the area with an elevation of 400 m-600 m.The main land use type in this area is cultivated grassland.The massive outflow of population in mountainous areas has led to the abandonment of cultivated land and concentrated soil erosion here;The area of soil erosion in the study area increases with the increase of slope,and the increase of slope directly leads to the increase of runoff and the speed of runoff,which aggravates the process of soil erosion.