关键词: DHSVM模型, 高寒山区, 八宝河流域, 参数敏感性分析, 径流模拟

Abstract: Distributed-Hydrology-Soil-Vegetation-Model (DHSVM) is a grid-based distributed hydrological model and has been widely used to simulate hydrological processes at high spatiotemporal resolution across the world owing to its particular calculation of surface water and heat balance. However, its applicability in cold and alpine regions remains unclear. This paper employed DHSVM to simulate hydrological processes during the period of 2001 to 2009 at a 300 meters and 3 hours modeling resolutions in the Babao River basin, a representative mountainous river basin located within the Qilian Mountains in the cold region of Northwest China. The applicability was thus validated with observations at the basin outlet. Parametric sensitivity analysis shows that lateral conductivity, field capacity, leaf area index and albedo are some most sensitive parameters. The default model parameters lead to overestimation of potential evaporation, and consequent underestimation of streamflow simulation in summers. Using calibrated parameters, the model can achieve good simulation with Nash-Sutcliffe efficiency coefficients of 0.72 and 0.87 in the calibration period (2001-2004), and 0.60 and 0.74 in the validation period (2005-2009) for daily and monthly simulations, respectively. This study concludes that DHSVM is generally capable for simulating hydrological processes at high spatial and temporal resolutions in cold and alpine regions, although it is insufficient in representing freezing and thawing processes occurred in soil, resulting in lower accuracy of streamflow simulation in springs, which should be addressed in future when modelling in those areas.

Key words: DHSVM, cold and alpine region, the Babao River basin, sensitivity analysis, streamflow simulation