| Liaoning Province has its own unique natural environment and erosion development characteristics.At present,Liaoning Province is seriously affected by the development of erosion gully,which has seriously threatened the sustainable development of workers and peasants in the region.However,there are few studies on the development rules and influencing factors of erosion gully in Liaoning Province.The lack of theoretical basis severely limits the scientific and effective prevention and control of erosion gully in this area.In view of this,the paper defines the study area as Liaoning Province.In order to investigate the distribution and development characteristics of erosion gully in Liaoning Province,and the influence of topography,vegetation,human,soil,and rainfall factors on the development of erosion gully in the study area,a comparative analysis was made of the development of erosion gully in typical regions of Liaoning Province(Fumeng County and Kuandian County).First,the research is divided into two levels:large-scale and small-scale.The paper summarized the characteristics of erosion gully distribution,quantitative development,length development,area development,erosion gully density development and gully crack development in Liaoning Province.It is believed that the newly added erosion gully in the study area are mostly“short and small”,Tieling City and Jinzhou City have increased the concentration of indicators for the erosion gully in Liaoning Province in the past five years.Further analysis of the impact of various factors in Liaoning Province on the development of erosion gully,it can be found,from the topographical point of view,the density of erosion gully in Liaoning Province tends to stabilize and then decrease as the elevation increases.The density of erosion gully has a parabolic trend with the increase of slope.When the slopes are<3oand>8o,the slope is not the most important factor affecting the development of erosion gully.When the slope length is 600~800 m,the change value of the erosion density is the largest(47.05 m/km~2),and in the area where the slope length is>1000m,the change value of the erosion gully density is small and it has no significant relationship with the change of the slope length.From the perspective of vegetation cover factors,When the vegetation coverage is less than 45%,the density of erosion gully is directly proportional to the vegetation coverage;when the vegetation coverage is greater than 45%,the erosion trench density is inversely proportional to the vegetation coverage.From the perspective of land use factors,The density of erosion gully in the study area reached a peak of 0.24 km/km~2in the plough area and reached a secondary peak of 0.2 km/km~2in the forest area.From the soil factor,The change of the density of erosion gully is 0.24 km/km~2 in the cinnamon soil area.In terms of rainfall factors,the maximum value of erosion density in Liaoning Province is 0.22 km/km~2 when the rainfall erosivity is between 1600 and 2000 MJ·mm/(hm~2·h).Further analysis of the differences in the development of erosion gully in Fumeng County and Kuandian County,it can be found,among all the influencing factors,the erosion gully in the forest area of Fumeng County were the most developed(WI?0.57),and the development of erosion gully was slow(WI?-5.2)from 2000~2500m;the erosion gully in Kuandian County had the most severe development(WI?1.36),the development of erosion gully was slow(WI?-3.12)from 1000~1500m.By comparing the remote sensing images,it can be seen that the cultivated land is the main land use type produced by the erosion gully in the two places,and the vegetation in Fumeng County has little impact on the development of the erosion gully.By comparing the remote sensing images,it can be seen that the cultivated land is the main land use type produced by the erosion gully in the two places,and the vegetation in Fumeng County has little impact on the development of the erosion gully.The density of erosion gully in the two places decreases with increasing distance from residential areas.Human activities have a greater impact on the development of erosion gully in Kuandian County than in Fumeng County.Human activities intensify the development of erosion gully.However,in the area more than 2000m away from the residential area,there is no distribution of erosion gully in the two counties,and other factors in addition to human activities should be considered in this area.By comparing the types of soil,the changes of the density of erosion gully in Fumeng and Kuandian counties peaked at 374.75 m/km~2 and 119.36 m/km~2respectively.The main innovative research ideas of this paper lie in the comparative analysis of erosion gully in typical areas and the coupling analysis of the factors affecting provincial erosion gully.The comparison of the distribution and development characteristics of erosion gully under the latest erosion trench data framework has effectively avoided the one-sided understanding of the development of erosion gully to some extent.The main innovative findings of the thesis lie in revealing the differences in the development of erosion gully in typical areas and the differences in the factors of changes in erosion gully in the dominant areas,as well as certain zoning characteristics of the distribution and development characteristics of erosion gully in Liaoning Province.Explored and clarified the impact of the continuous growth characteristics of erosion gully on the development of erosion gully.A coupling analysis method for the influence of various factors of the erosion trench on the development of the erosion trench was explored.It reveals that the erosion ditches in Liaoning Province are controlled by the regional differentiation rules of erosion development under internal and external forces.Based on comparative analysis of erosion gully in typical areas,the factors that govern the development of erosion gully in the two areas are proposed,the development of erosion gully in Liaoning Province has been studied in depth from large-scale and small-scale. |
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