Dam overtopping risk assessment considering inspection program |
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| Authors: | Jan-Tai Kuo Yung-Chia Hsu Yeou-Koung Tung Keh-Chia Yeh Jian-De Wu |
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| Institution: | (1) Department of Civil Engineering and Hydrotech Research Institute, National Taiwan University, Taipei, Taiwan;(2) Department of Civil Engineering, National Taiwan University, Taipei, Taiwan;(3) Department of Civil Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong;(4) Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan |
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| Abstract: | Safety inspection of large dams in Taiwan is conducted every 5 years. The practice does not take into consideration uncertainty
of dam conditions. The goal of this study is to determine the optimal dam inspection interval under the consideration of overtopping
risk incorporating uncertainty gate availability. In earlier studies, assessment of overtopping risk only considered the uncertainties
in reservoir properties and natural randomness of hydrologic events without giving much thought to the availability of spillway
gates. As a result, the overtopping risk could be underestimated. In this study, an innovative concept is proposed to evaluate
dam overtopping by taking into account spillway gate availability. The framework consists of three parts: (1) evaluation of
conditional overtopping risk for different numbers of malfunctioning spillway gates; (2) evaluation of spillway gate availability;
and (3) dam inspection scheduling. Furthermore, considerations are given to overtopping risk, inspection cost, and dam break
cost for determining the optimal inspection schedule. The methodology is applied to the Shihmen Reservoir in Taiwan and to
evaluate its time-dependent overtopping risk. Results show that overtopping risk considering the availability of the spillway
gates is higher than the one without considering the availability of the spillway gates. |
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| Keywords: | Dam safety Dam inspection Overtopping risk Gate availability Fault tree |
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