基于WARMF模型的杭埠-丰乐河流域泥沙模拟的初步研究

研究了WARMF模型在杭埠-丰乐河流域的水文、泥沙模拟适应性能以及流域SS非点源时空变化特征。利用流域地貌-土壤分布对应关系、土壤剖面结构、地下水位埋深等条件,研究了子流域的平面分组与剖面土层结构的确定,较大程度上降低了模型参数的校准难度与不确定性。利用2000—2003年水文、泥沙观测数据,对模型水文、泥沙参数进行了校准与检验,表明:WARMF在研究区具有较好的水文、泥沙模拟适应性能。基于全流域—支流域—子流域三种尺度分析了流域SS非点源空间变化特征,表明:流域SS非点源入河负荷主要源于农林区贡献;杭埠河支流是泥沙流失控制的重点;A、B、C三级子流域是SS非点源控制的关键区。流域SS非点源出口负荷随时间变化研究表明,5—8月是SS非点源控制的关键时段。

Study on WARMF Model for SS Simulation in Hangbu-Fengle River Watershed

Watershed Analysis Risk Management Framework(WARMF)model was applied for hydrologic and sediment simulation and temporal and spatial variation features of suspended sediment in the Hangbu-Fengle River Watershed of Chao Lake.The catchments classification and soil profile were determined based on analysis of the relation between topography and soil type within the study area,the soil profile structure and groundwater table etc.Observed hydrologic data and suspended sediment data in 2000-2003 were used for model calibration and validation.Study on calibration and validation of hydrologic and sediment parameters indicated that WARMF model was applicable for hydrologic and sediment simulation in Hangbu-Fengle River watershed.Non-point sources spatial variation analysis at three levels of watershed-subwatershed-catchment indicates that the agricultural land and forest land are the major sources of SS.Hangbu River branch is the key area for non-point sources sediment control.The SS contribution from the Class A,Class B and Class C sub-catchments is 86.53%,so they can be considered as the key SS control zones.Study on temporal changes of non-point sources SS loads into the lake indicated that SS loads are concentrated mainly from May to August,which is the key period for non-point SS pollution control.