The Rainfall Threshold of Dynamic Inundation Warning System

• Main Authors: Yun-Ying Chen, 陳昀瑛
• Other Authors: Yen-Chang Chen
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/n5g6m9

碩士 === 國立臺北科技大學 === 土木與防災研究所 === 99 === Taiwan during summer and autumn, typhoons often cause heavy rain in some areas it''s a disaster, especially the lower river area and low-lying areas suffered the pain of flooding.Whenever a typhoon rainstorms, often resulting in people''s lives and economic activities of the injury. Thus, if the pre-disaster to provide early warning information, in order to reduce disaster losses and the threat of flooding. In this study, FLO-2D flood model in 2005 to 2009, five typhoons and heavy rainfall events to simulate rainfall flooding Tsengwen the case, then geographic information system (GIS) layer overlaying a range of flooded towns, investigation and comparison with the actual flooding, for further analysis to explore; and simulation results by the flooding, in flood mode provides the choice of the future reference. In addition, in order to develop a simple simulation of flood warning judged mechanism to control the point of the catchment area 24 hours design storm, in the first, second warning level conditions, the analysis of possible flooding of the local rainfall warning value, the last that establishing a warning level can be further under the rain delay - the value of the relationship between rainfall warning. Simulation results show that the Tsengwen River flood prone area as mandarin area, within a large area, Shanhua area, Madou area and mountain areas. The control point in a catchment area, two under the warning level, 1,3,6,12,24-hour alert rainfall values were 67mm, 73mm, 78mm, 85mm, 95mm and 118mm, 127mm, 137mm, 144mm, 165mm .