PROPOSAL OF A MULTIPLE RESERVOIR OPERATION METHOD TO SATISFY BOTH FLOOD CONTROL AND WATER USE IN THE CHI RIVER BASIN, NORTHEASTERN THAILAND

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  • タイ東北部Chi川流域における治水・利水の両面を満足する複数貯水池運用方法の提案

Abstract

<p> In this study, we proposed a reservoir operation method for two major reservoirs in the Chi River Basin in northeastern Thailand, where specific reservoir operation rules for flood control purposes are not stipulate and agriculture is a major industry, to contribute to both flood control and water utilization in the basin.First, based on the water levels correlation between upstream and downstream, the flood trvel time from the dam reservoir to the downstream area, which is the flood-prone zone, was calculated, and the lead time for reservoir operation was calculated. Next, we attempted to reduce the water level in the downstream area of the reservoir by giving the increase or decrease of the water level in the downstream area, which is a point of concern, as an explanatory variable for the reservoir operation. The proposed reservoir operation method was applied to the 2017 flood, when dam inflows and downstream flood inundation were very large, and resulted in a 0.4 m reduction in the maximum inundation depth downstream while ensuring sufficient water storage for water use by the beginning of the dry season at both of the dams.</p>

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