SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Simulation of streamflow and sediment with the SWAT model in a data scarce catchment in the Three Gorges Region, China 
Authors:Bieger, K., G. Hormann and N. Fohrer 
Journal:Journal of Environmental Quality 
Volume (Issue):43(1) 
Article ID: 
URL (non-DOI journals): 
Broad Application Category:hydrologic and pollutant 
Primary Application Category:sediment loss and transport 
Secondary Application Category:hydrologic assessment 
Watershed Description:3,200 km^2 Xiangi River in Hubei Province in central China 
Calibration Summary: 
Validation Summary: 
General Comments:This article is part of a JEQ special SWAT section. 
Abstract:The Three Gorges Region in China is currently subject to a large-scale land use change, which was induced by the construction of the Three Gorges Dam on the Yangtze River. The relocation of towns, villages, and agricultural areas is expected to impact the water balance and increase erosion rates and sediment yields in the affected catchments. Hydrologic and water quality models are frequently used to assess the impact of land use changes on water resources. In this study, the eco-hydrological model SWAT is applied to the Xiangxi Catchment in the Three Gorges Region. This paper presents the calibration and validation of streamflow and sediment loads at Xingshan gauging station. The calibration of daily streamflow resulted in a satisfactory fit of simulated and observed data, which is indicated by NSE (Nash-Sutcliffe efficiency) values of 0.69 and 0.67 for the calibration (1981-1986) and validation (1988-1993) periods, respectively. In contrast, the model was not able to simulate the monthly average sediment loads correctly as indicated by very low NSE values of 0.47 (calibration) and 0.08 (validation). This might be due to a number of reasons including an inadequate representation of spatial rainfall variability by the available climate stations, insufficient input data, uncertainties in the model structure, or uncertainties in the observed sediment loads. The discussion of these possible reasons for the incorrect prediction of sediment loads by SWAT reveals the need for further research in the field of hydrological and water quality modeling in China.