Evaluation of the Impact of Urbanization and Climate Variation on Flood Hazards in Urban Areas – A Case Study of Taichung Metropolis
Date Issued
2011
Date
2011
Author(s)
Chen, Chia-Jung
Abstract
Recently, flood hazard has become progressively serious due to climate variations and urbanizations. The metropolitan area is a complex and sensitive system. The rainfall runoff process is primarily affected by the anthropogenic factors. The main objective of this research is to evaluate the impact of climate variations and urbanizations on flood hazards in Taichung metropolis. Two kinds of flood-inundation simulation modules, i.e. the separation algorithm and integration algorithm, linking the 1-D river routing model, the storm water management model and the 2-D inundation routing model, to study the interactions of regional drainage, surcharged manholes and surface runoff.
In addition, in order to validate the accuracy of the separation algorithm and integration algorithm, the Typhoon Kalmaegi event in 2008 is applied to verify the above two algorithms. In general, the simulated results have good agreement with the measured data. Based on the simulated results, the present research has revealed that the integration algorithm is more practical to simulate the rapid storm sewer drainage function than the separation one. The integration algorithm is allowed overland flow to return into storm sewer drainage system once again.
Finally, this research utilizes the integration algorithm as the computational model, considering the environmental factors of climate variations and urbanizations, to simulate the study case. In different urbanization setting, the study case is based on two kinds of landuse data which was supplied by Dept. of Land Administration in 1997 and 2007, respectively. In climate variations setting, the study case takes two periods (one is from 1980 to 1999 and the other is from 1980 to 2009) into account. Thus, the study case has four simulated scenarios. Based on a series of simulations, the results show that the urbanization causes more significant effect on inundation areas than climate variations. With the better urbanization, the flooding hazards will result in more damages in the metropolis.
Subjects
Urbanization
Climate Variation
Flood simulation
Taichung metropolis
Integration algorithm
Separation algorithm
Type
thesis
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