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Predicting Runoff And Phosphorus Loads From Variable Source Areas A Terrain-Based Spatial Modelling Approach
Journal of Spatial Hydrology
Research has been conducted at Flaxley Agricultural Centre in South Australia to predict phosphorus loss in surface runoff from dairy pastures. Part of the research investigated if the topography based, spatially distributed hydrological model - TOPMODEL could be adapted to successfully predict phosphorus loads off dryland and irrigated catchments, where variable source area hydrology is considered a dominant process. This was carried out by integrating one season of field measured runoff and P load data with rainfall and evapotranspiration data. The methodology uses TOPMODEL to simulate runoff volume and spatial extent of saturated areas, using a topographic index - ln(As/tanB) …