Coupling Scheme of Inundation Processes into a Basin-wide Hydrological Model for Low-lying Rivers

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  • 流域水循環のモデル化における低平河川からの氾濫過程の導入方法
  • リュウイキスイ ジュンカン ノ モデルカ ニ オケル テイヘイ カセン カラ ノ ハンラン カテイ ノ ドウニュウ ホウホウ

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Abstract

In this paper, we describe the development of an inundation process model integrated with a basin-scale distributed hydrological model. The procedure applied for assessing the flood hazard uses a simple assumption that an inundated area is a reservoir, in which the water levels for the river and the surrounding reservoirs are equivalent. Inundated water levels were calculated with continuous equations of the reservoir with H-V and H-A relations in the area, in which the excess rate of surface flow above the maximum conveyance capacity of rivers is treated as an input to the inundated areas. To apply this inundation model, we used Aster GDEM, which is one of high-resolution digital elevation models to extract detailed topographical features. We applied the model to the Xebanfai River in the Laos PDR and carried out daily calculations for 5 years. By incorporating the inundation process model, the performance of the distributed water circulation model were improved in terms of calculated discharges showed that the peak discharges and their timing of occurrence. In addition, we rigorously validated the model by comparing the calculated inundation areas with those extracted from the ALOS/PALSAR images. The comparison revealed that the large-scale inundation processes in the lower reaches of the basin were precisely represented by the model, but also showed that additional analyses are required to improve the accuracy in the middle reaches and branches.

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