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 indicates that WARMF model is 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 indicates that SS loads are concentrated mainly from May to August, which is the key period for non-point SS pollution control.EI02224-2324