Application of Srh-2d To Predict Water and Sediment Delivery To Reservoirs

Natural and anthropogenic activities within a watershed can have marked effects on water and sediment delivery to reservoirs. A holistic approach is usually needed to quantify these effects and watershed modeling is typically used to achieve this. For sedimentation projects, the model used must be capable of predicting both upland and instream contributions, fluxes between the two domains, connectivity (or dis-connectivity) along the pathways, and ultimate material delivery to the watershed outlet.

Recent enhancements to SRH-2D have extended its application to watershed analyses, for predicting hillslope runoff and soil erosion, and stream flow and sediment transport throughout the watershed. Newly incorporated hydrologic modules now make it a good tool for performing a broad range hydrologic and hydraulic analyses for design and management purposes. Use of a conservative modeling approach and tighter coupling between terrestrial and instream processes, along with a flexibility in meshing and assignment of landscape properties to the mesh, makes the model particularly amenable to studies across different scales; both small and large.

This study provides a brief overview of the new enhancements to SRH-2D and demonstrates its application to two watersheds with different characteristics. We will highlight typical inputs, modeling steps, and distinct advantages of the model when performing sediment delivery and management analyses.