Flood damage map for the Huong River Basin : based on inundation depths, land use types and population density, using depth-damage curves, maximum damage values and depth-mortality curves

Chen, J. (2007) Flood damage map for the Huong River Basin : based on inundation depths, land use types and population density, using depth-damage curves, maximum damage values and depth-mortality curves.

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Abstract:In the last decade, the basin of the Huong River has been flooded several times causing damage all over the Thua Thien Hué Province. These floods are initiated by tropical storms which are accompanied by heavy rainfall. Economic and social consequences are significant and should be restricted in the future. This assignment contributes to creating an insight in the consequences, by developing a damage map based on inundation depths and the land use in the Huong River Basin. At the Vietnam National University of Hanoi, HEC-RAS software has been used to develop a model for inundation depths. Applying the discharges of the November 1999 flood in the Thua Thien Hué Province, an inundation map is created that is used as input for this assignment. Together with a damage function and spatial data about the settlements, the infrastructure and the agriculture, the damage map is created. The damage function consists of depth-damage curves and maximum damage values which are compatible to the several land use types. These are collected from preliminary damage assessments and literature concerning damage functions. The damage is calculated per land use type by multiplying the damage factor derived from the depth-damage curve with the maximum damage for the particular grid cell. The HEC-RAS inundation map that is used as input for the damage map, is compared with an observed inundation map of the November 1999 flood. The HEC-RAS model seems to be insufficient to simulate the inundated surface, but the data within its prediction of the inundated areas are qualitative more significant: 26 percent of this data is similar to the observed data. Also the accumulated damage of the resulting damage map is compared with the existing data of the November 1999 flood. The total damage based on the damage map corresponds reasonably with the reported damage in November 1999. Determining the damages and inundation surface per land use, it can be concluded that the rural settlements suffer most in case of a flood. This land use type should obtain the most attention for reducing flood consequences since it has great vulnerability for flooding and the fact that it is often located in heavily inundated areas. The method implemented for the damage map is also used for the mortality in the Huong River Basin, but now using the inundation depths and the population density for input. However, the obtained depth-mortality curve seems not to be valid since during the comparison with the data of the November 1999 flood, the mortality turned out to be highly overestimated.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering BSc (56952)
Link to this item:http://purl.utwente.nl/essays/68464
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