Author(s): Cong V. Mai; E. C. Van Berchum; T. A. W. Van Corven; T. M. Hessels; D. Kuijk; J. Van Oosten; A. Zordrager
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Keywords: Inundation map; Flood protection; Flood management; System design; SOBEK; Huong River
Abstract: The Thua Thien-Hue province is located in the center of Vietnam. It is characterized by the short distance between the mountains in the west and the coast of the South China Sea in the east. Two large rivers flow through the province, fed by multiple smaller rivers from the mountains. The coastal zone of the Thua Thien-Hue province has a lot of water related problems. Tackling these problems requires an integrated approach that considers all problems, functions and stakeholders. This paper will aim to apply a Framework for Integrated Water Management to the Thua Thien-Hue province to minimize the water related problems in the future, with a primary concern towards flood protection. This framework assigns different return periods for flooding per area. A map is created that indicates the desired chance on flooding throughout the coastal and flood prone area of the Thua Thien-Hue province. Using a SOBEK 2D model, the flooding can be simulated. The results from this model show that the amount of water that enters the area is too large to apply traditional protection by raising dikes. Also, most houses are built near the riverbanks, making the implementation of dikes problematic. Two possible solutions were considered. The first, consisting of two bypasses, showed unrealistic as the capacity of the second bypass was insufficient. The second scenario, called “Lake Hue”, uses a reservoir as a retention area during extreme events. A dam regulates the discharge towards Hue City while a spillway towards an area with a lower population density takes care of excess water
Year: 2014