Flood Mitigation Analysis For Abnormal Flood
Author(s)
C. Choi, J. Ahn & J. Yi
Abstract
Rainfall characteristics are changing due to climate change in Korea, as they are
across the rest of the world. While the average annual rainfall is increasing, the
number of rainy days is decreasing and that results in the increase of rainfall
intensity. Because of the increase in rainfall intensity, the frequency of abnormal
rainfall and floods is also increasing and can lead to extensive damage. It is
necessary to establish reasonable alternatives to mitigate flood damage. In order
to establish suitable disaster mitigation alternatives to overcome abnormal
flooding, the following methods are used. Firstly, a test basin which has a big
city in downstream vulnerable to flood damage is selected. Secondly, flood
vulnerability is evaluated by a variety of scenarios and flood mitigation
alternatives. Finally, the goal is to find out the best flood mitigation alternative
that can protect the city located downstream. Since the Namhangang River basin
selected for the test basin has only one reservoir, Chungju Reservoir, the flood
control capability is relatively small considering the basin area. Therefore, in the
case of flood occurrence which exceeds the flood control capacity of Chungju
Reservoir, Yeoju which is located downstream of Chungju Reservoir, may have
flood damage. In July of 2006, the flood was close to the design flood that
actually occurred in Yeoju. The July of 2006 flood event is first analyzed, and
the rainfall which is 1.2, 1.3, 1.4, 1.5 times greater than the actual rainfall is
generated and analyzed for the safety of Yeoju. On the basis of the analyzed
flood vulnerability of Chungju Reservoir, five alternatives are considered to
reduce the flood damage in Yeoju. As a result, the alternative of constructing a
new reservoir is found to be the most efficient alternative to mitigate the flood
damage in Yeoju.
Keywords: abnormal flood, flood vulnerability, flood mitigation analysis.
Keywords
abnormal flood, flood vulnerability, flood mitigation analysis
Related Book
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