Runoff Simulation In The Typical Watershed Of Loss Plateau Based On SWAT-SUFI Model And The Development Of Digital Watershed Management System

With the development of global climate change, the problem of shortage of waterresources and ecological environment deterioration in the Loess Plateau watershed has beenwidely concerned. The data landuse types, soil types, DEM and meteorological/hydrologicaldata (from1977-1989) in Tuweihe (Upper) Watershed (Yunlin city, Shaanxi) was collected.With the help of GIS software (ArcGIS), we used the SWAT model to establish the basinterrain, soil, landuse, and meteorology databases. The SWAT model was used to simulate therunoff in this Watershed, and the SWAT Error Checker tool was utilized to check the inputdata of the hydrological model. The SUFI-2algorithm in the SWAT-CUP software wasemployed to analyze sensitivity parameters and calibrate the parameters of this model. Therunoff data from1977-1983in Gaojiabao hydrological station was used to calibrate, and theresults of the calibration are: the correlation coefficient (R2) of the annual runoffs is0.53, andthe model efficiency coefficient (Ens) of the annual runoffs is0.46. In terms of the monthlyrunoffs, the results of the calibration are: the correlation coefficient (R2) is0.61, and themodel efficiency coefficient (Ens) is0.60. The model efficiency coefficient (Ens) of monthlyrunoffs from May to October is0.83, and the model efficiency coefficient (Ens) is0.80. Therunoff data from1984-1989was employed to verdict the results of simulation. The results ofthe calibration are: the correlation coefficient (R2) of the annual runoffs is0.59, and themodel efficiency coefficient (Ens) of the annual runoffs is0.02. As for the monthly runoffs,the results of the calibration are: the correlation coefficient (R2) is0.66, and the modelefficiency coefficient (Ens) of the annual runoffs is0.52. The model efficiency coefficient(Ens) of monthly runoffs from May to October is0.84, and the model efficiency coefficient(Ens) is0.79. The results show the SWAT model can substantially simulate the runoff ofTuweihe (Upper) Watershed. In this study, considering the WebGIS (Rich Client)techonology, with the help of the ArcGIS Server (for Silverlight) developing tool and VisualStudio2008platform, this paper also designed and developed a digital watershedmanagement and monitoring system, to achieve real-time dynamic monitoring data of hydrological stations in this watershed, and linked the simulation result of SWAT model andits database. This system could monitor and mange hydrological and meteorological data, andthe users could display and download the useful data depend their preference. It has a friendlyinterface, and is a great tool for the people whose work is involved with hydrology, waterresources and metrology.