Study on warning and emergency stages of Tan-shui River

Keh-Chia Yeh*, M. J. Chen, E. T. Lin

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The purpose of this paper is to examine the existing warning stages of the target stations in the Tan-shui River basin and to propose suitable warning and emergency stages. First, historical damages during the flood periods and the hydrographs of water surface elevation of the target stations are analyzed. Necessary actions that the government and people should take are also discussed. Referring to the strategy adopted by other countries, such as Japan, America, and Mainland China, the definitions of the warning and emergency stages for Tan-shui River are proposed. Seventeen representative sets of historical typhoon floods are selected. On the basis of the inundation area and depth data, we analyze the rising speed of the floods, and the critical inundation elevations of the river banks or levees. Second, some circumstances should be considered including: (1) limited sample size of the historical typhoon floods, and (2) the uncertainties of the hydrological conditions, including the rainfall in the watershed and the sea level during typhoon period. Thus besides 17 sets of historical flood events, 187 synthetic sets of flood events are generated. Third, the rising speeds of the stages for the total 204 sets of food events at target stations are computed by using 1-D numerical channel-network hydraulic model. According to above approaches, the warning and emergency stages of the target stations in Tan-shui River can be determined more practically and precisely because the hydrological uncertainties of the watershed are considered.

Original languageEnglish
Title of host publicationWorld Water Congress 2005
Subtitle of host publicationImpacts of Global Climate Change - Proceedings of the 2005 World Water and Environmental Resources Congress
Number of pages1
DOIs
StatePublished - 1 Dec 2005
Event2005 World Water and Environmental Resources Congress - Anchorage, AK, United States
Duration: 15 May 200519 May 2005

Publication series

NameWorld Water Congress 2005: Impacts of Global Climate Change - Proceedings of the 2005 World Water and Environmental Resources Congress

Conference

Conference2005 World Water and Environmental Resources Congress
CountryUnited States
CityAnchorage, AK
Period15/05/0519/05/05

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