Study On Wind Erosion In Ebinur Lake's Dry Lakebed

In the natural evolution process,influencing by population,arable land, vegetation and water volume entering Ebinur Lake,Ebinur lake brings about 1500 km2 dry lakebed in the northwest,where is the origin material of sandstorm and floating dust in Xinjiang.Therefore,analyzing and summarizing mechanism of wind erosion in Ebinur lake's dry lakebed will play a useful reference role to prevent and control the soil wind erosion scientifically and reasonable.Through classification and interpretation of remote sensing image,this paper separate Ebinur lake's dry lakebed as wind erosion area and quick soil area ,use photogrammetric technology to obtain DEM which is about Ebinur lake's dry lakebed,analyze the profile of Ebinur lake's dry lakebed , express characteristics of wind erosion patterns about dry lakebed and establish flooding model to speculate amounts of wind erosion in Ebinur lake's dry lakebed in near 50 years. According to changes of granularity's characteristics about five typical soil profile, this paper extract migrating discipline about wind erosion material in Ebinur lake's dry lakebed. Conclusions are as follows:1.This paper investigates extraction method of the boundary of wind erosion area and quick soil area.Influenceing by depression storage in high flow period,wind erosion area often show different gray scale and brightness in the remote sensing image.Choosing a typical gray value pixel in border area can extract the boundary of wind erosion area and quick soil area more accurately,rapidly.2.By means of digital photogrammetry technology,this paper obtain high-precision DEM .After testing the accuracy, standard deviation of test-point error is 0.0202m. The result shows that digital photogrammetry technology is the feasibility in quantitative research which is about wind erosion in Ebinur lake's dry lakebed .3.Using DEM data extracts the main wind direction's profile in wind erosion area and vertical direction of the main wind direction in quick soil area of Ebinur lake's dry lakebed ,results tell status of morphological characteristics of the main wind direction in wind erosion area and status of morphological characteristics of vertical direction of the main wind direction in quick soil area of Ebinur lake's dry lakebed.4.Establishing the flooding model extrapolates the total amount of wind erosion and the average annual amount of wind erosion of Ebinur lake's dry lakebed in the past 50 years.This paper also obtained distribution and area of Ebinur lake's dry lakebed and the amount of wind erosion of Ebinur lake's dry lakebed on the different depth wind erosion.5.Through analyzing changes of particle size characteristics of the five soil typical profile,this paper extracts material migration discipline and soil loss in the process of wind erosion.