1Hanoi University of Natural Resources and Environment
Flood is one of the most dangerous natural disaster in Vietnam. Assessing flood hazard is a long term ambition of the society, especially in low-land cities where almost its communities expose to flood caused by heavy rainfall over its upstream river basin. In order to do that, designing flood events is one of the very first step. This paper evaluates some methods of flood design and give an advise for choosing relavant method in Vietnam which have been test in Vu Gia Thu Bon river basin. The procedure includes several steps: 1. Design a storm event which cause heavy rainfall over the basin; 2. Estimate the Arial Reduction Factor (ARF); 3. Estimate the flood peak; and 4. Design the flood events. The first step have been done by develop IDF curve over the basin; then several combination methods of Arial Reduction Fator and flood peak estimation have been applied and evaluated to choose the most relevant one with respect to literatural flood peak values. The result show that, USWB method for ARF identification in combination with Rational method for flood peak estimation give a very good result for flood hazard design.
Cite this paper
Truong Van Anh, Le Thu Trang (2019), Identification of relevant method for flood events design an approach to flood hazard assessment at river basin scale. Vietnam Journal of Hydrometeorology, 3, 62-70.
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