Abstract
Failure modes for earth dams are extensively reviewed and analysed using a three-pronged approach including a literature review, physical observations of a representative earth dam site and finite element structural analysis of the dam wall. Several failure scenarios are used for predicting consequences in terms of downstream inundation and damage. The fluid flow component is performed using the mesh-free smoothed particle hydrodynamics method. For a representative earthen dam, piping and landslip are identified as key failure modes based on a combination of finite element analysis, theory and physical observations. Inundation behaviour is very different for the two failure modes. The landslip failure is the most critical one for the dam studied with flood water breaking the river bank and affecting surrounding property and farmland. For the piping failures, water flow from the initial pipes formed for significant periods before they collapse, but the flow rates are small compared with that of the much larger landslip mode. After failure, fragments of the collapsing wall block the breach and can considerably restrict the flood discharge. In some cases, the water pressure is able to push the obstructing material downstream and some minor flooding occurs, but in others cases the breach can remain blocked with little flooding occurring. A prototype risk framework is developed using the small database of the pre-computed flooding scenarios and key variables that affect inundation such as water level in the reservoir. This can be used to estimate inundation maps for as yet non-computed scenarios through interpolation and superposition techniques. The implementation of the risk framework is demonstrated by the estimation of inundation maps for two in-between non-computed reservoir levels. Inundation due to multiple breaches is also estimated by superposition of three single-breach scenarios. Results are compared against the simulated multiple breach. A preliminary implementation of this risk framework into a geographic information system is also described.
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Acknowledgments
We are grateful to AusAID for their financial support for the project on Landscape Scale Monitoring and Modelling. This paper presents outcomes from the second stage of this project. We greatly appreciate all assistance provided by Anhui Provincial Bureau of Surveying and Mapping and the local dam authorities for visiting the Sanwan reservoir. We also acknowledge the Anhui Provincial Bureau for providing the DTM of the Sanwan Reservoir region.
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Cleary, P.W., Prakash, M., Mead, S. et al. A scenario-based risk framework for determining consequences of different failure modes of earth dams. Nat Hazards 75, 1489–1530 (2015). https://doi.org/10.1007/s11069-014-1379-x
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DOI: https://doi.org/10.1007/s11069-014-1379-x