연구의 선진화와 생산성 향상에
필요한 최적의 소프트웨어와 컨설팅을
공급하도록 노력하겠습니다.

SEDZLJ Sub-model


Two sediment models are currently available in the EFDC_DSI model. These may be selected by choosing either “Use EFDC Sediment Model” or “Use SEDZLJ Sediment Model.” The SEDZLJ Sediment sub-model is now implemented in EFDC_Explorer along with hydro-mechanical devices (HMK). EFDC_Explorer can display SEDZLJ results including sediment fluxes and active layer thicknesses. However, at this time, the user cannot create, edit or view the input data.


SEDZLJ has been developed by Sandia National Laboratories, and the SEDZLJ EFDC User Manual is downloadable from this site. In his paper on this sub-model, the primary developer, Scott C. James, provides a detailed description of how recently-developed sediment dynamics formulations are incorporated into the United States Environmental Protection Agency’s EFDC. The new approach is an extension of previous models and accounts for multiple sediment size classes, has a unified treatment of suspended load and bedload, and appropriately replicates bed armouring. The resulting flow, transport, and sediment dynamics model is an improvement to previous models because it may directly incorporate site-specific data, while maintaining a physically consistent, unified treatment of bedload and suspended load. Experimental data from a noncohesive sediment erosion experiment in a straight channel helped validate the numerical model. In the simulation, unknown parameters representing the active layer thickness and the erosion rates of the two largest sediment size classes when they are newly deposited are identified from the available data.


SEDZLJ