Research On The Assessment Of Soil Wind Erosion In Hebei Province Based On Wind Erosion Model

Soil erosion which caused the land degradation is one of global environmental problems, also contributed to the occurrence of land desertification in arid, semi-arid and sub-humid region. China is one of the countries which most severely affected by soil erosion hazard in the world. The area happened and affected by soil erosion has accounted for more than half of the land area, owing to a large area of arid and semi-arid regions of our country.Serious soil erosion is not only harm to erosion source area, taking away a lot of surface particulate matter, but also result in the loss of surface fine material, soil nutrient and organic matter. And it will cause the land degradation and desertification, leading to area of farmland and grassland ecosystem productivity reduced, declining the regional ecological service function, affecting the sustainable development of ecological environment and Social Economy of erosion source area. Soil erosion also produces a wide range of dust storms and air pollution problems, affecting people’s normal production and health of surrounding area. In recent years, China scholar’s research on soil wind erosion mainly concentrated in the arid and semi arid area. In fact, the soil wind erosion in semi humid area have occurred from time to time. And it can cause the area of atmospheric particulate matter increased, causing serious environmental pollution problems.The terrain of Hebei province is from northwest to southeast, landform types is complete as well as the soil types. Hebei is located in the northeast of the North China Plain and the inner ring of Beijing and Tianjin, which is very important in geography position. According to the survey, Hebei province is one of the most serious soil erosion in China. The standard of division in traditional wind erosion area is according to whether it will cause the soil degradation. The wind erosion of traditional erosion zones in Hebei Province and its neighboring areas although not cause soil degradation. Hebei Province and its neighboring areas of wind erosion of traditional erosion zones, however, its contribution to air pollution should not be overlooked.This article used the wind erosion Model which was used in the first national water survey. The model of traditional wind erosion region was extended to the northern semi-humid. The embryonic form of the model is created based on wind tunnel test results by the domestic scholars, and the model is applied and gradually improved in Beijng and Tianjin sandstorm source control project. The model is composed respectively of arable land, forest and grassland, sand erosion prediction model. And the article discussed the suitability of this application, including the selection of land use types and the determination of vegetation coverage in the non-growth season.In this paper,the study area is including all the spatial extent of Hebei Province, based on MODIS data and sites measured data.Applying the mainstream erosion model approach using GIS and Remote sensing technology to deal with the remote sensing data,and then obtained soil erosion factors. Then substituted these factors into the soil erosion model,calculating for each month of the soil erosion modulus of Hebei province. we get the annual soil erosion modulus of Hebei Province by image element addition method based on IDL platform. Then according to the classification and grading criteria soil erosion in our nation,soil erosion in Hebei province, was classified and quantitative evaluated. And the article discussed the spatial distribution differences of soil erosion and impact factors. Through the above analysis and evaluation in order to provide a scientific basis for the land degradation and the prevention of air pollution.The evaluation result demonstrated that space difference of wind erosion intensity was obvious in Hebei province. Mired erosion accounting for about 65.36% of the total area of Hebei Province was the largest, which mainly distributed in Hebei plain, and the west and north mountain in Hebei province. Followed by the slight erosion, accounting for about 12.46% of Hebei Province, which was mainly distributed in Bashang plateau, and northwest of Hebei which is covered with mountain and basin. Moderate and strong wind erosion which accounted the smallest area, a total of less than 0.1% of Hebei province, was mainly distributed in the northern region of sand. Through the above analysis and evaluation in order to provide a scientific basis for the land degradation and the prevention of air pollution.