2002年のタイ王国・Chao Phraya川流域における洪水

概要

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The second largest flood in 2002 occurred in the Chao Phraya River basin, Kingdom of Thailand. The field survey was carried out in the middle and lower part of the Chao Phraya River basin two weeks after the peak of the flood terminated. The result indicated that middle basin, especially Ang Thong, Ayutthaya and Sing Buri cities had suffered a heavy damage. In the meantime, there was little serious damage from the inundation by river water in Bangkok city that is located in the lower basin area. The following two factors are mentioned as the reason; (1) In Bangkok, the flood discharge had been reduced by the time it reached the lower basin area because of the overtopping in the middle basin. (2) The flood discharge has been degreasing in the downstream of the Chao Phraya River basin year by year since the Bhumibol and the Sirikit dams were constructed in the upper basin. In addition, the evaluation of the provability was carried out on the flood in 2002 using the generalization extreme value distribution. The flood was estimated under the 10-year return period discharge and it turned out the flood with the high possibility of occurrence.
2004-08-31