By Limin Zhang, Ming Peng, Dongsheng Chang, Yao Xu
This e-book integrates the actual approaches of dam breaching and the mathematical points of possibility evaluation in a concise demeanour
• the 1st e-book that introduces the explanations, strategies and results of dam failures
• Integrates the actual tactics of dam breaching and the mathematical elements of hazard evaluate in a concise manner
• Emphasizes integrating concept and perform to raised show the appliance of chance evaluation and determination methodologies to genuine cases
• Intends to formulate dam-breaching emergency administration steps in a systematic constitution
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Additional resources for Dam failure mechanisms and risk assessment
Note that ‘at risk’ here means the possibility of a failure mode associated with a specific potential location. For instance, overtopping may be due to insufficient capacity of the spillway in a dam system. The two primary failure causes, overtopping and internal erosion, can be discussed in relation to these potential locations at risk. 8. 1 Analysis of Homogeneous and Composite Earthfill Dams Dam failures due to overtopping often occur in the flood season. As presented before, insufficient spillway capacity is a major reason for overtopping.
A reinforced outlet channel and flood gates were constructed in 1773 in order to control runoff from rainstorms or snowmelt. However, on 22 October 1774, the residual landslide dam still failed completely by overtopping (Schuster and Evans, 2011). 2 Engineering Mitigation Measures for Landslide Dams When a landslide dam forms and threatens people either upstream or downstream of the dam, immediate engineering measures must be taken to stabilize the blockage, prevent the lake water from reaching dangerous levels, or control the erosion rate before breaching.
Some landslide dams tend to have short life whenever small landslides block a stream with a large drainage area or inflow rate. Besides, landslide dams of predominantly soft, low density, fine‐grained or liquefiable sediment lack resistance to erosion and may not last long. 3 Failure Modes Without channelized spillways or other protected outlets, landslide dams commonly fail by overtopping. 8 compares the failure modes of landslide dams and constructed man‐made earth and rockfill dams. 2% (2 cases) by slope failure.
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