Analysis Of Soil And Water Loss Regionalization In Yingchuan River Basin Of Tianshui City Based On 3S Technology

Soil erosion is one of the regional environmental problems that plague the world today.It has a wide range of influences and serious damage to the natural environment.It causes various soil erosion disasters,restricts the development of regional economy,and seriously endangers the normal life and life and property of human beings.This research is supported ry GIS technology,remote sensing technology,GPS technology,water and soil flow and prevention technologies.The Yingchuan River Basin in Tianshui City is used as the research area.The ArcGIS software operation platform is used,and SQL SERVER and Geodatabase areused as the database platform system.Survey of internal and external data of soil erosion influencing factors such as terrain data extraction,remote sensing image interpretation,meteorological factor collection,river network survey,soil data survey,etc.,using GIS spatial technology analysis method to establish the impact factors of soil erosion in Yingchuan River Basin GIS geospatial database.Based on the three-dimensional terrain model of the Yingchuan River Basin in Tianshui,a mathematical model for the severity of soil erosion was constructed and a water and soil conservation plan for the Yingchuan River Basin was developed.The main research work is as follows:(1)The topography and structure of the Yingchuan River Basin and the composition of the river network were investigated.Yingchuan River Basin involves 52 villages of Ma Runquan,Ganquan and Maiji 3 Towns in Maiji District,The total drainage area is 320.79 km2.It originates from the Qinling Mountains in the southwestern area of Maiji Mountain Scenic Area.The source is at the height of the valley and the peak of the slope.Steep;the terrain is high in the south and low in the north.It is the transitional zone between the two major geological tectonic regions of the western Fujian Lutai and the Chinese Qinling geosyncline.It is the two major geomorphological types of the Loess Plateau and the Qinling Mountains.The lowest altitude of the Yingchuan River Basin is 1088m,the highest altitude is 2191m,and the average altitude is 1552m.The average slope of the basin is 20.90 degrees,slope and steep slope area greater than 25 degrees are 124.29 km2,accounting for 38.76%.(2)According to the field investigation and sampling experiment of soil,the data of soil microaggregate content in the study area were obtained.The survey found that the Yingchuan River Basin has five types of soils,such as the yellow loess soil in the valley,the black loess on both sides of the mountain beam,the brown soil and the comprehensive soil in the Maijishan forest area,and the red clay formed in the small areas such as Jiahe Village and Maiji Village.the Lord.Through the experiment of soil micro-aggregation,it was found that the average content of water-stable aggregates of air-dried soil larger than 0.25mm:black loess 29.75g/kg,loess soil 55g/kg,comprehensive soil 119.75g/kg,brown soil 188g/kg,red clay reached 435.5 g/kg.(3)Based on SQL SERVER and Geodatabase database software platform,establish a geospatial database of soil erosion factors in Yingchuan River Basin.(4)Through the sample survey,the overall erosion and sediment yield intensity of the Yingchuan River Basin is calculated based on the model,and the soil erosion erosion and sediment yield values are divided into mild erosion zone,moderate erosion zone,intensity erosion zone and pole.Five eroded sediment yield intensity grading areas of intensity erosion zone and severe erosion zone.Among the erosion intensity grade distribution,the moderate erosion area is 28.10km2,accounting for 8.76%of the soil erosion area;the intensity erosion area is 186.07km2,accounting for 58.00%of the soil erosion area;the extremely strong erosion area is 99.44km2,accounting for the soil erosion area.31.00%;the area of severe erosion is 7.18km2,accounting for 2.24/%of the area of soil erosion.(5)According to the analysis results of soil erosion data model,the water and soil conservation plan of Yingchuan River Basin was formulated.It is proposed to implement comprehensive control of mountain,water,land,forest and road with small watershed as the unit,combining engineering measures and biological measures,combining slope measures with trench engineering,and controlling and developing control measures.It has played a good technical support role in the water and soil erosion control and planning of the water conservancy sector.