Author(s): Kei Koura; Naoki Koyama; Tadashi Yamada

Linked Author(s): Tadashi Yamada

Keywords: River basin management; Dam reservoir; Central vietnam

Abstract: In central region of Vietnam, typhoons in September to November have caused floods that have inundated low-lying area along the coast. In addition, the annual number of floods is on the rise, and future increases in precipitation are predicted, which may increase vulnerability to flooding. On the other hand, river basins in the central region of Vietnam have dam reservoirs, including those for flood control purposes, which could be utilized to reduce flood disaster damage. This study aimed to investigate the potential flood control effects of dam reservoirs in a river basin in Central Vietnam. We conducted a flood inundation analysis for the Huong River basin. The analysis was conducted for the case that the dam reservoirs in a river basin implemented prior flow and the case that the dam reservoirs fully stored rainfall in their catchment areas, and the potential flood control effects of the dam reservoirs were investigated based on the analysis results of river water levels and inundation depths. From this study, it is clear that if the dam reservoir had implemented prior flow, the river water level could have been reduced by about 70 cm and the inundation depth by about 20 cm to 40 cm. It is also cleared that if the dam reservoir were able to fully store rainfall in its catchment area, river water level could have been reduced by 2m to 3m and inundation depths by 50cm to 80cm.

DOI: https://doi.org/10.3850/978-90-833476-1-5_iahr40wc-p1458-cd

Year: 2023