Assessment of Floodwater Behavior in Van Coc Lake, Hanoi in Event of Emergency Situation

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X
本文フルテキスト
Van Coc Lake located in the Dan Phuong and Phuc Tho, Hanoi, Vietnam has an area of 30.83 km2. It is usually dry and includes arable land and residential areas. However, to protect Hanoi City from catastrophic floods, in emergency situations, it receives the floodwater from the Red River as a regulating reservoir and drains the floodwater to the downstream Day River through the Day weir. We performed numerical simulations to assess the movement of floodwater in this lake and evaluated the impact of floodwater on its residential areas. A two-dimensional depth-integrated hydrodynamic model was constructed to simulate inundation in this lake. The model was validated and the effects of Manning’s coefficient of roughness were examined. In case of emergency, it has to receive an inflow of 2,500 m3/s into the area. Inflow rates of 1,200 and 600 m3/s were also examined to compare the results. The simulation results indicate that this lake was entirely inundated in 13, 28, and 56 h by inflow rates of 2,500, 1,200, and 600 m3/s, respectively. Between 66% and 99% of residential areas were inundated. The areas with highest velocity were primarily focused behind the gate with a velocity of 1.5–1.8 m/s.
刊行年月日
作成者 Sai Hong ANH Toshinori TABATA Kazuaki HIRAMATSU Masayoshi HARADA Le Viet SON
著者キーワード Day weir Red River two-dimensional depth-integrated model flood disaster
公開者 Japan International Research Center for Agricultural Sciences
受付日 2018-05-29
受理日 2018-10-30
53
3
開始ページ 181
終了ページ 190
DOI 10.6090/jarq.53.181
言語 eng

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