Abstract
The Tangjiashan dammed-lake is the largest dammed-lake induced by the M8.0 Wenchuan Earthquake on May 12, 2008 in Sichuan Province, China. The highest water level in Tangjiasha dammed-lake once reached 743.10 m elevation, with a volume of about 2.466 × 108 m3. After a spillway being evacuated on the debris dam, water level fell to about 713 m, with a volume of about 0.86 × 108 m3. After that, the dam succeeded in withstanding the impacts from floods or debris flows in following 3 years. Till September 2011, many engineering countermeasures were adopted in strengthening the dam and a plan to transform the dammed-lake into an earthquake relic tourist spot was proposed. This paper discussed the influencing factors acting on the process of the Tangjiashan Dam breaching and pays special attention to the final stage when the erosion turned weaker and the water level got lower slowly. It was found that the slope of downstream face of dam and the river bed elevating in the site adjacent to the outlet during the process of breaching play important roles in the cease of erosion. Recommendations in the future research in the Tangjishan dammed-lake are proposed.
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Acknowledgments
This work was supported by the Chinese State Key Basic Program (project 2011CB409902) and the Key Research Program of the Chinese Academy of Sciences (project KZZD-EW-05-01).
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Su, Zm., Cui, P., Yang, Qq., Ugai, K., Cai , F. (2013). The Future in the Tangjiashan Dammed-Lake Resulted from the M8.0 Wenchuan Earthquake: Discussion on Several Scientific Issues. In: Ugai, K., Yagi, H., Wakai, A. (eds) Earthquake-Induced Landslides. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-32238-9_98
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DOI: https://doi.org/10.1007/978-3-642-32238-9_98
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