Estimate Of The Wind Erosion Modules In Tianjin Province In Recent 10 Years Based On RWEQ Model

In this paper,taking Tianjin as the research area,the land use/land cover data of Tianjin for nearly 10 years were obtained by visual interpretation method.Then the wind speed data and soil texture data of the study area were transformed and then decomposed by the endogenous linear mixed model The vegetation fertility and withering vegetation coverage were obtained.Finally,using the Revised Wind Erosion Equation developed by the US Department of Agriculture to estimate the soil wind erosion in Tianjin for nearly 10 years.The land use/land cover and soil wind erosion in Tianjin were analyzed in the past 10 years.The results show:(1)Tianjin land use/land cover is mainly composed of dry land,artificial body surface and water body.During the period from 2005 to 2015,diyland and water body are mainly dominated by the main body,mining area,mining area,paddy field and grassland,The artificial plant surface of the new map unit up to the total area of 46.41%;sparse grass and bare soil is relatively stable.In the 60-type change map,the "dry land ? artificial object surface" pattern unit type change the most significant,an area of 514.82km2,scattered in the area except the six districts outside the city.(2)Based on the input requirements in the model,climate factor,soil erodibility factor,soil crust factor,soil surface roughness factor and comprehensive vegetation factor were calculated respectively.The wind erosion force in Tianjin is increasing,and the wind erosion force in the southern part of the coastal area starts to increase when it is affected by the sea land wind and the western Pacific subtropical high,and the wind erosion is rapidly decreasing with the offshore distance.In 2005 and 2015,the maximum soil erodibility factor in Tianjin was dominated by the coastal area of Binhai,and the crustal factor value is larger at the junction of the eastern part of Baodi and the northeastern and middle part of Ninghe.Tianjin soil roughness range between 0-0.6.Tianjin's growing vegetation coverage is very high,the growth of vegetation factors as a whole are very low.Binhai and the city of six in the summer of 2015,the winter of the integrated vegetation factor is basically the same,the other areas are low in summer,winter high.(3)In 2005 and 2015,the soil erosion modulus of Tianjin was concentrated at 0-10t/(km2·a),all of which were micro-wind erosion.Mainly in the winter,to farmland,or chard-based land use/cover type.In 2005,most of Tianjin had soil wind erosion,and the soil erosion area was the junction of Beichen,Xiqing and Wuqing.The second was the western part of Baodi,the northeast corner of Ninghe and the east,Jinnan.In 2005,the total area of wind erosion was 7527.25km2.According to this article,the 10 grades of micro-erosion were mainly first to fifth,of which 74.16%were fistr and second.In 2015,the area of wind erosion was 7223.5km2.Compared with that in 2005,the distribution range did not change obviously,and the wind erosion level was downgraded.Overall,nearly 10 years of Tianjin wind erosion tends to reduce.