Research On Runoff Calculation In Data-deficient Areas Based On GI

This paper takes the remote location,the relative lack of observation facilities such as hydro-meteorological stations,and the relative lack of hydrological forecasting data of the Abqin River as the research object,selects the upper basin of the Abqin River as the area for calculating the production and sink flow in the area of lack of data,and applies the SCS model to calculate the production and sink flow based on GIS with the help of Arc GIS software,and achieves the following results:1.Combining the rainfall data from 2000-2014 at nine meteorological stations including Raohe County near the Abqin River basin,with the help of spatial interpolation technology in Arc GIS software,the advantages and disadvantages of the interpolation results of different methods in the case of fewer interpolation sample points,and selecting the rainfall interpolation results of the best interpolation method as the source of rainfall data in the upper reaches of the Abqin River.2.With the help of various geographic data sites,by Arc GIS software analysis and processing to generate the distribution map of the water system of the Abqin River,the distribution map of soil types in the watershed,the map of topographic and geomorphological features and the distribution map of land use,to pave the way for a full understanding of the Abqin River watershed profile and to provide support for the determination of CN values of key parameters in the flow production calculation.3.With the help of sub-basin analysis tool of SWAT plug-in in Arc GIS software,sub-basins of the upper reaches of the Abqin River were divided,and parameters such as flow length,slope and area of each sub-basin were generated to apply the causeless unit line in SCS confluence model for confluence calculation.4.According to the evaluation criteria and relative error RE in the Hydrological Information and Forecasting Standard,we evaluate the calculation results of SCS confluence model to verify the strengths and weaknesses of the simulation results,and realize the research on the calculation of confluence based on GIS and the application of SCS model to the data deficient areas.The research on the calculation of rainfall runoff in the upper watershed of the Abqin River is worthy of reference and reference for scholars studying the same type of topics,and the results of the simulation of rainfall runoff can be used in flood forecasting in similar areas,the discussion of the law of rainfall runoff and the study of the law of rainfall runoff formation.