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Optimal gate operation of a main drainage canal in a flat, low-lying, agricultural area using a tank model

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Abstract

Chiyoda basin is located in Saga Prefecture in Kyushu Island, Japan, and lies next to the tidal compartment of the Chikugo River to which the excess water in the basin is drained away. Chiyoda basin has a total area of about 1,100 ha and is a typical flat and low-lying paddy-cultivated area. The main problem in this basin is the appropriate operation of drainage structures during and after flood events in order to minimize the inundation damages for crop yield and to fulfill the irrigation requirement in the irrigation period. This paper presents a mathematical model of a drainage system in Chiyoda basin for calculating the flood inundation and optimizing the operation of gates in a main drainage canal. First, the algorithm of gate operation was simulated and the drainage model was then evaluated by comparing the simulated water levels with those observed during an actual rainfall event. The results show that the observed and simulated water levels are in good agreement, indicating that the proposed model is applicable for drainage and inundation analyses in flat, low-lying paddy-cultivated areas. Second, the optimization of gate operation was investigated by trial and error method using a stochastic rainfall time series with a return period of 30 years and the tidal conditions of spring and neap tides in the Chikugo River. Comparing a total inundation time, a total inundation area and maximum inundation depth in the paddy tanks at the upstream and the downstream ends, it was concluded that the present operation based on the gate operators’ experience was almost the optimal one, and the sooner start of opening operation and the later start of closing operation within the operationality of check gates were recommended to minimize the inundation damage. The present operation could be able to minimize the total inundation time, the total inundation area and the maximum inundation depths in paddy tanks and to meet fully both the drainage and the irrigation requirements.

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Acknowledgments

The authors wish to acknowledge the Chikugo River Basin Irrigation and Drainage Project Office, Kyushu Regional Agricultural Administration Office, the Ministry of Agriculture, Forestry and Fisheries of Japan for the acquisition of the in situ measurement data of the water levels in the main drainage canal. We appreciate the helpful cooperation in modeling the drainage network in Chiyoda basin provided by Gijutsu Kaihatsu Consultant Co., Ltd, Fukuoka, Japan. Partial financial support for this study was provided by JSPS Grants-in-Aid for Scientific Research (B) (project numbers: 16380163 and 19380138). We would also like to thank all of the project members for their invaluable discussions.

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Authors and Affiliations

  1. Laboratory of Drainage and Water Environment, Division of Regional Environment Sciences, Department of Bioproduction Environmental Sciences, Graduate School of Bioresourse and Bioenvironmental Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan

    Le Van Chinh

  2. Laboratory of Drainage and Water Environment, Division of Regional Environment Sciences, Department of Bioproduction Environmental Sciences, Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan

    Kazuaki Hiramatsu & Masayoshi Harada

  3. Natural and Environmental Science Course, Department of Agriculture, Faculty of Agriculture, Kochi University, B 200 Monobe, Nanko-ku, Kochi, 783-8502, Japan

    Makito Mori

Authors
  1. Le Van Chinh
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  2. Kazuaki Hiramatsu
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  3. Masayoshi Harada
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  4. Makito Mori
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Correspondence to Le Van Chinh.

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Van Chinh, L., Hiramatsu, K., Harada, M. et al. Optimal gate operation of a main drainage canal in a flat, low-lying, agricultural area using a tank model. Paddy Water Environ 6, 243–256 (2008). https://doi.org/10.1007/s10333-008-0129-7

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  • DOI: https://doi.org/10.1007/s10333-008-0129-7

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