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ASSESSMENT OF TWO PHYSICALLY BASED WATERSHED MODELS BASED ON THEIR PERFORMANCES OF SIMULATING SEDIMENT MOVEMENT OVER SMALL WATERSHEDS
Citation:
Kalin**, L. AND M M. Hantush*. ASSESSMENT OF TWO PHYSICALLY BASED WATERSHED MODELS BASED ON THEIR PERFORMANCES OF SIMULATING SEDIMENT MOVEMENT OVER SMALL WATERSHEDS. Presented at First Interagency Conference on Research in the Watersheds, Benson, AZ, 10/28-30/03.
Description:
Abstract: Two physically based and deterministic models, CASC2-D and KINEROS are evaluated and compared for their performances on modeling sediment movement on a small agricultural watershed over several events. Each model has different conceptualization of a watershed. CASC2-D divides the watershed into cells and flow and sediments are routed through these cells in a cascading fashion. Conversely, KINEROS divides the watershed into sub-watersheds and channel segments. Studies with KINEROS showed that the geomorphologic resolution which can adequately represent the sedimentograph is dependant on the size of the storm. Small storms entail more detail. A methodology is proposed for the selection of optimum resolution based on KINEROS. A similar study is conduct on CASC2-D to evaluate the effect of cell size on sedimentograph. Both the cell size in CASC2-D and the sub-watershed delineation in KINEROS are user dependent. The degree of user dependency of each model is compared. CASC2-D requires large amount of
data and time. KINEROS, on the other hand, entails relatively less data and effort. Accordingly, ease of use and computation times are also compared. These criterions will form the basis of model selection of an ongoing effort to enhance one of these models to handle BMPs (Best Management Practices) such as vegetative filter, strips, buffer zones, settling ponds, wetlands etc. (if not already available within the model).