チャオプラヤ川流域ナコンサワンにおける洪水解析および応用型タンクモデルの試み

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  • Flood Analysis and Trial of Applied Tank Model at Nakhon Sawan in the Chao Phraya River Basin.
  • Flood Analysis and Trial of Applied Tan

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In 1995, Thailand suffered from serious flood disaster. In Hydrology Division of the Royal Irrigation Department (RID), stress has been placed on flood problems again. In the present study, we studied relation between discharge of the Chao Phraya River at Nakhon Sawan and that from the upstream basin during flood period of 1994 to 1996. In and around low flat area near the Nakhon Sawan confluence point, habitual flooding and inundation occur particularly along the Yom and Nan Rivers, resulting in natural flood retarding effect. Flood storage volume in 1996 was calculated approximately 4.0 thousand million m3 for the study area, and actual capacity was estimated larger than that. Around a half of the upstream flood discharge originates from the Nan River. Also, we tried to make a simple and practical applied tank model which represents flood retarding effect. Main input data are sum of the three daily discharges on the Ping, Yom and Nan Rivers, and output is the Chao Phraya River daily discharge at Nakhon Sawan (RID C. 2 station). The obtained model, consisting of a river channel tank and three retarding area tanks, presented comparatively fine results. We discussed on probable effect induced by preparedness against flood in 1996. It was presented that degree of model adaptability to other floods may be variable, depending on selected floods for calibration.

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