GIS-based channel flow and sediment transport simulation using CCHE1D coupled with AnnAGNPS

摘要

The Center for Computational Hydroscience and Engineering one-dimensional model simulates unsteady free-surface flows with nonequilibrium, nonuniform sediment transport in dendritic channel networks. Since the early 1990s, this channel network model and its software packages have been developed and continuously maintained and upgraded. Applications show that the channel network model is a useful tool for the assessment of the performance of best-management practices in a watershed when coupled with watershed modelling. In this study, version 3.0 of the channel network model has been integrated with version 5.41 of the Annualized AGricultural Non-Point Source model and the ArcGIS control module is developed to replace the ArcView GIS control module resulting in a new version, the Center for Computational Hydroscience and Engineering 1-Dimensional model version 3.2. A case study, performed for the Goodwin Creek Watershed, shows that time-series of flow discharges and observed annual sediment accumulation can be well simulated by the channel network model coupled with the Annualized AGricultural Non-Point Source model.