Development of Distributed Rainfall Runoff Model and Evaluation of its Optimal Mesh Size in the Can Don Watershed in Southern Vietnam

DOI IR (HANDLE) Open Access
  • Okawa Karuna
    Laboratory of Water Environment Engineering, Course of Bioproduction Environmental Sciences, Department of Agro-environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University
  • Hiramatsu Kazuaki
    Laboratory of Water Environment Engineering, Division of Bioproduction Environmental Sciences, Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University
  • Trieu Anh Ngoc
    Division of Science, Technology and International Affairs, Thuyloi University, HCMC Campus, Vietnam
  • Harada Masayoshi
    Laboratory of Water Environment Engineering, Division of Bioproduction Environmental Sciences, Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University
  • Tabata Toshinori
    Laboratory of Water Environment Engineering, Division of Bioproduction Environmental Sciences, Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University
  • Ozaki Akinori
    Institute of Tropical Agriculture, Kyushu University

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Other Title
  • ベトナム南部Can Don流域における分布型降雨流出モデルの開発と最適メッシュサイズの検討

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Description

The purpose of this study is to develop a rainfall-runoff model that can be applied even in regions with scarce watershed and hydrological data, such as emerging countries in Southeast Asia, and that can predict long-term changes in runoff due to future regional development and climate change. Specifically, a distributed rainfall-runoff model was constructed in order to create a model that can reflect the spatiotemporal heterogeneity of rainfall and future land use changes for the Can Don watershed located in the southern part of Vietnam as the target watershed. Furthermore, focusing on the effect of the mesh size of the distributed rainfall-runoff model on the calculated discharge, the models with seven mesh sizes of 450m, 900m, 1800m, 2700m, 3600m, 4500m, and 9000m were constructed, and the rainfall runoff characteristics of models were examined in relation to topographical characteristics expressed by the models. / Based on the obtained data on the basin boundary, elevation, land use, rainfall and runoff discharge of the target watershed, the watershed models and input data for the rainfall-runoff model were generated. At that time, in order to reflect the land use area more accurately in the models, the tank models for each land use such as forest, paddy field, upland, and urban area were introduced to each mesh. As a result of the numerical calculations, it was concluded that the 4500m-mesh model was the most suitable for the Can Don watershed because it took a short calculation time and could appropriately express the discharge waveform, peak discharge, and total discharge for a year.

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