Evaluation of barrier lake breach floods: Insights from recent case studies in China,WIREs Water

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Evaluation of barrier lake breach floods: Insights from recent case studies in China
WIREs Water ( IF 8.2 ) Pub Date : 2019-12-11 , DOI: 10.1002/wat2.1408
Zuyu Chen ₁ , Qiang Zhang ₂ , Shujing Chen ₃ , Lin Wang ₄ , Xingbo Zhou ₅

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Historically, China has experienced frequent barrier lake breach hazards, and several cases have been monitored during their occurrences using complete breach flood hydrographs. These have enabled the analysis of dam breaches to be improved by merging hydraulics and soil mechanics expertise. Some novel improvements to analytical methods have also been published. This study presents the authors' proposed hyperbolic soil erosion and lateral enlargement models, together with a numerical algorithm that enables easy calculation of the breach flood hydrograph. In general, the peak flows calculated using this improved method agree with field measurements and are less sensitive to input parameters. The research outcomes are presented on an Excel spreadsheet (DB‐IWHR, online download available), and these are self‐explanatory with minimal tutorials. This software will be of particular use in an emergency situation, when it is necessary to quickly evaluate the breach flood. This study reviews four large‐scale barrier lake breaches; the Yigong breach which documented a peak flow close to 100,000 m³/s and the recent Baige breaches featuring burst recurrences over a month‐long period.

更新日期：2019-12-11

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