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Water 2018, 10(2), 140; https://doi.org/10.3390/w10020140

The Total Risk Analysis of Large Dams under Flood Hazards

State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
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Received: 3 December 2017 / Revised: 20 January 2018 / Accepted: 24 January 2018 / Published: 1 February 2018
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Abstract

Dams and reservoirs are useful systems in water conservancy projects; however, they also pose a high-risk potential for large downstream areas. Flood, as the driving force of dam overtopping, is the main cause of dam failure. Dam floods and their risks are of interest to researchers and managers. In hydraulic engineering, there is a growing tendency to evaluate dam flood risk based on statistical and probabilistic methods that are unsuitable for the situations with rare historical data or low flood probability, so a more reasonable dam flood risk analysis method with fewer application restrictions is needed. Therefore, different from previous studies, this study develops a flood risk analysis method for large dams based on the concept of total risk factor (TRF) used initially in dam seismic risk analysis. The proposed method is not affected by the adequacy of historical data or the low probability of flood and is capable of analyzing the dam structure influence, the flood vulnerability of the dam site, and downstream risk as well as estimating the TRF of each dam and assigning corresponding risk classes to each dam. Application to large dams in the Dadu River Basin, Southwestern China, demonstrates that the proposed method provides quick risk estimation and comparison, which can help local management officials perform more detailed dam safety evaluations for useful risk management information. View Full-Text
Keywords: flood; total risk factor (TRF); the Dadu River Basin; reservoir routing; highest water level (HWL) of reservoir; cascade dams; risk rating; risk class flood; total risk factor (TRF); the Dadu River Basin; reservoir routing; highest water level (HWL) of reservoir; cascade dams; risk rating; risk class
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Chen, Y.; Lin, P. The Total Risk Analysis of Large Dams under Flood Hazards. Water 2018, 10, 140.

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