Soil Erosion:Applicability of the Sediment Routing Methods

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Ogden and Heileg (2001) performed a detailed study on the performance of the methods used in the CASC2D version 1.18 model and early versions of the GSSHA model and model and made several reccomendations to improve the formulation. Many of these formulation enhancements have included in the current version of GSSHA, v4 and higher. Additional features include the ability to specify the number, size, and specific gravity of particles, sediment detachment due to rainfall impact, refinement of the Kilinc Richardson model, and the addition of several other methods of computing transport capacity. This model has been tested against historical data sets and demonstrates improved capability over earlier versions of the model. Of note is that all sediment transport capacity equations in GSSHA contain some type of "erodibility" factor that varies betweend zero and unity. These factors are typically assigned according to land use and include the effect of many processes and contributing factors. Proper assignment of the erodibility relies on calibrating the factors with observed data. Calibrated model parameters should also be verified with independent observed data not used in the calibration effort.

GSSHA User's Manual

10 Soil Erosion
10.1     Overland Erosion Formulation
10.2     Channel Sediment Transport Formulation
10.3     Sediment in Lake
10.4     Applicability of the Sediment Routing Methods
10.5     Simulations with Soil Erosion