モンスーン域ベトナムにおける降水の強度-期間-頻度曲線の構築

Abstract

降水の強度-期間-頻度曲線（rainfall Intensity-Duration-Frequency (IDF) relationship）は，水工計画や水工設計，様々な水資源プロジェクトにおいて最も共通に使われる有用なツールである。IDF曲線の構築はBernard(1932)によって初めてなされ，それ以来，多くの関係式が世界中で提案されてきた。しかしながら，そのような関係式を用いた降水の等値線図は，ベトナムを含めてアジアモンスーン域の多くの発展途上国で極めて需要が高いにも関わらず，充分作成されていない。本研究ではベトナムにおける7箇所の降雨観測所におけるIDF曲線を構築し，一般化IDF曲線をベトナム Red River Delta (RRD)を対象に構築する。

The rainfall Intensity-Duration-Frequency (IDF) relationship is one of the most commonly used tools in water resources engineering, either for planning, designing and operating of water resource projects, or for various engineering projects against floods. The establishment of such relationships was done as early as in 1932 (Bernard). Since then, many sets of relationships have been constructed for several parts of the globe. However, such map with rainfall intensity contours has not been constructed in many developing countries, including Vietnam. There is a high need for IDF curves in the monsoon region of Vietnam. This research is to construct IDF curves for seven stations in the monsoon area of Vietnam and to propose a generalized IDF formula using base rainfall depth, and base return period for Red River Delta (RRD) of Vietnam.