An Assessment of Structural Measures for Flood-prone Lowlands with High Population Density along the Keelung River in Taiwan |
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| Authors: | Lung-Sheng Hsieh Ming-Hsi Hsu Ming-Hsu Li |
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| Institution: | (1) National Science and Technology Center for Disaster Reduction, Taipei, Taiwan, ROC;(2) Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan, ROC;(3) Institute of Hydrological Sciences, National Central University, Taiwan, ROC |
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| Abstract: | Midstream of the Keelung River Basin in Northern Taiwan has become highly urbanized and densely populated area. Flood inundation
along riversides frequently occurred during typhoons or rainstorms. Three protection measures, including constructions of
high-level protection levees, a diversion channel, and a detention reservoir, were proposed for flood mitigation. The main
purpose of this study is to evaluate the flood mitigation performance of the three proposed structural measures by using combined
hydrologic analyses and hydraulic routings. A semi-distributed parallel-type linear reservoirs rainfall-runoff model was used
for estimating the surface runoff. Furthermore, a 1-D dynamic channel routing model was coupled with a two-dimensional inundation
model to simulate the hydraulic characteristics of river flooding and overland flow. Simulation results of flood stages, runoff
peak discharges, and inundation extent under design rainfall scenarios were chosen as the criteria for evaluation. The results
showed a diversion channel is superior to the other two measures for flood mitigation of the study area. After the process
of environmental impact assessment, a revised diversion channel approach has been approved for construction as the major structural
measure. |
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| Keywords: | flood-prone lowlands flood inundation flood mitigation inundation model structural measures |
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