Design And Implementation Of Soil Erosion Model System For Watershed Scale

In recent years,soil erosion caused by over-exploitation and environmental destruction seriously threatens ecological security and the safety of people's property.Mastering the quantitative evaluation method of soil erosion is a prerequisite for rational and effective soil and water conservation work.However,the quantitative assessment of soil erosion at the watershed scale is complex and time-consuming.Therefore,it is very important to establish a comprehensive system that integrated the technology of 3S and other research results for simulating and calculating the soil erosion process in watershed scale.In this Thesis,based on the soil erosion model proposed by Fu et al.,a series of relevant model calculation principles are analyzed.According to the functional requirements and non-functional requirements of the watershed soil erosion model system,we designed and implemented a watershed soil erosion model system.The system can be used to calculate the soil erosion processes in watershed scale.The research contents and main results of this thesis are as follows:(1)Based on the watershed soil erosion model,we analyzed the Chinese soil erosion forecasting equation,the SCS-CN method,the flood peak discharge calculation,the Muskingum method,the current-carrying sand force calculation,the mud sand transport calculation methods,and a series of watershed soil erosion calculation methods.We also analyzed the purpose of the calculation,the calculation method and the calculation process of each module of the watershed soil erosion model.Then the theoretical basis for the design and implementation of the soil erosion model system for watershed scale was established.(2)A comprehensive analysis of the needs of the watershed soil erosion model system was conducted.And the overall architecture design and functional design of the system were determined.The system uses a three-tier structure.The main functions of the system,such as parameter setting and data management,data preprocessing,model calculation,data visualization and output of statistical results.(3)According to the system requirements analysis and system design plan,the watershed soil erosion model system was implemented with the C# program language and Geospatial Data Abstraction Library(GDAL).The main purpose this system is to calculate the processes of the watershed soil erosion model system automatically.For this purpose,a variety of different calculation schemes are designed and implemented for end users.In addition,in order to make the system more practical,a number of system functions including input data management,data visualization,data preprocessing,and calculation result statistics have also been realized.(4)The Chabagou basin was used as a research area to test and apply the watershed soil erosion model system.The experiment obtained a series of special data.And this thesis has analyzed the system calculation results.