Development of Rainfall-Sediment-Runoff Model in the Upper Brantas River, Indonesia
作成者 Takara, Kaoru, Sayama, Takahiro, Nakayama, Daichi, Tachikawa, Yasuto
日本十進分類法 (NDC) 517, 450
内容 研究概要:A distributed rainfall-sediment-runoff model is constructed to investigate flood and sediment movement on a catchment scale. The model treats spatial data sets such as topography and land cover effectively by applying GIS (geoglaphical information system) and remote sensing techniques. This research uses GIS to produce a DEM (digital elevation model) and remotely sensed data to classify land cover. The model constructed here is a grid-cell-based distributed model. The grid-cell-based kinematic wave model calculates rainfall-runoff and sediment is yielded when overland How occurs on each grid-cell with surface volcanic soil layer. A primitive model (Takara, 2000) assumed that sediment was yielded with infiltration depth D regardless of energy of overland flow, which has limitation to transport sediment on each grid-cell. Considering a transportation capacity of overland flow on each grid-cell makes it possible to model both sediment yield processes and sediment deposit processes. The unit stream power theory decides the transportation capacity. Yielded sediment in slope grid-cells moves in the flow direction derived from the DEM to river grid-cells, on which bed load and suspended load are calculated. The model is applied to the Lesti River basin (625 km^2) located in the upper Brantas River basin, and simulates sediment runoff during a rainy season from November 1995 to April 1996.
コンテンツの種類 研究報告書 Research Paper
掲載誌情報 共同利用研究会報告集 page.121-130 (2002)
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