Runoff Simulation Based On SWAT Model In The Raoyang River Basin

Hydrological model is a tool to research variation of hydrological phenomena so that water resources can be rationally allocated,also has great significance in industrial and agricultural production as well as in the study of the hydrological situation.This paper summarizes the research status and progress of distributed hydrological model and SWAT model,elaborated on the principles and structure of the SWAT model.To meet the needs of SWAT model,the research prepared DEM,land use map,soil map and meteorological data,and established spatial database combined with SWAT model database.The experiment has been divided into 27 sub-basins and 55 hydrological response unit,in order to achieve the level of sub-divided basin and hydrologic response units(HRU),to facilitate the description of distribute watershed.The key parameters to determine the impact of runoff simulation,simulation can achieve accuracy requirements,have a certain credibility.Error model calibration and verification of the period are within the permissible range,indicating that the model can be applied to Raoyang River and change the resolution under DEM context,analysis and simulation of runoff,studies have shown that the following DEM 250m resolution for runoff simulation of almost no impact.To runoff simulation based on SWAT model in the Yaoyang river,the experiment chooses 11 years from 1992 to 2002 Dongbaichengzi station daily runoff data to calibration,and use 2003 to 2006 Dongbaichengzi station daily runoff data to test.The results show that the SWAT model can be applied Raoyang Riv er more accurate after the simulation results of the Nash-Suttcliffe efficiency factor analysis.Finally,simulate the effects of changes in the sub-division and DEM resolution watershed study area daily runoff.