Abstract
Although several physically based sediment runoff models have been proposed, sediment production and supply to river channels has not been considered in detail. In this paper, we introduce a freeze-thaw action model and gully erosion model for sediment production, and a talus erosion model for sediment supply. Each numerical model is connected to the sediment transport model proposed by Egashira and Matsuki (2000). Applying this combined model to a real mountainous basin, we confirm that this can express some sediment runoff characteristics in this geomorphological context; for example, seasonal variation of sediment runoff, temporal variation of the deposited sediment amount in the talus, and differences between upstream and downstream riverbed deformation.
