Overtopping breaching of river levees constructed with cohesive sediments
Experiments were conducted in a bend flume to study the overtopping breaching process and the corresponding overflow rates of river levees constructed with cohesive sediments. The river and land regions were separated by the constructed levee in the bend flume. Results showed that the levee breachin...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-07-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | http://www.nat-hazards-earth-syst-sci.net/16/1541/2016/nhess-16-1541-2016.pdf |
| _version_ | 1818963991803723776 |
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| author | H. Wei M. Yu D. Wang Y. Li |
| author_facet | H. Wei M. Yu D. Wang Y. Li |
| author_sort | H. Wei |
| collection | DOAJ |
| description | Experiments were conducted in a bend flume to study the
overtopping breaching process and the corresponding overflow rates of river
levees constructed with cohesive sediments. The river and land regions were
separated by the constructed levee in the bend flume. Results showed that
the levee breaching process can be subdivided into a slope erosion stage, a
headcut retreat stage and a breach widening stage. Mechanisms such as flow
shear erosion, impinging jet erosion, side slope erosion and cantilever
collapse were discovered in the breaching process. The erosion
characteristics were determined by both flow and soil properties. Finally, a
depth-averaged 2-D flow model was used to simulate the levee breaching flow
rates, which is well expressed by the broad-crested weir flow formula. The
deduced discharge coefficient was smaller than that of common broad-crested
rectangular weirs because of the shape and roughness of the breach. |
| first_indexed | 2024-12-20T12:54:01Z |
| format | Article |
| id | doaj.art-987e256618044c66906a430e32406a75 |
| institution | Directory Open Access Journal |
| issn | 1561-8633 1684-9981 |
| language | English |
| last_indexed | 2024-12-20T12:54:01Z |
| publishDate | 2016-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Natural Hazards and Earth System Sciences |
| spelling | doaj.art-987e256618044c66906a430e32406a752022-12-21T19:40:06ZengCopernicus PublicationsNatural Hazards and Earth System Sciences1561-86331684-99812016-07-011671541155110.5194/nhess-16-1541-2016Overtopping breaching of river levees constructed with cohesive sedimentsH. Wei0M. Yu1D. Wang2Y. Li3State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, 430072 Wuhan, People's Republic of ChinaState Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, 430072 Wuhan, People's Republic of ChinaState Key Laboratory of Simulation and Regulation of River Basin Water Cycle, China Institute of Water Resources and Hydropower Research, 100038 Beijing, People's Republic of ChinaState Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, 430072 Wuhan, People's Republic of ChinaExperiments were conducted in a bend flume to study the overtopping breaching process and the corresponding overflow rates of river levees constructed with cohesive sediments. The river and land regions were separated by the constructed levee in the bend flume. Results showed that the levee breaching process can be subdivided into a slope erosion stage, a headcut retreat stage and a breach widening stage. Mechanisms such as flow shear erosion, impinging jet erosion, side slope erosion and cantilever collapse were discovered in the breaching process. The erosion characteristics were determined by both flow and soil properties. Finally, a depth-averaged 2-D flow model was used to simulate the levee breaching flow rates, which is well expressed by the broad-crested weir flow formula. The deduced discharge coefficient was smaller than that of common broad-crested rectangular weirs because of the shape and roughness of the breach.http://www.nat-hazards-earth-syst-sci.net/16/1541/2016/nhess-16-1541-2016.pdf |
| spellingShingle | H. Wei M. Yu D. Wang Y. Li Overtopping breaching of river levees constructed with cohesive sediments Natural Hazards and Earth System Sciences |
| title | Overtopping breaching of river levees constructed with cohesive sediments |
| title_full | Overtopping breaching of river levees constructed with cohesive sediments |
| title_fullStr | Overtopping breaching of river levees constructed with cohesive sediments |
| title_full_unstemmed | Overtopping breaching of river levees constructed with cohesive sediments |
| title_short | Overtopping breaching of river levees constructed with cohesive sediments |
| title_sort | overtopping breaching of river levees constructed with cohesive sediments |
| url | http://www.nat-hazards-earth-syst-sci.net/16/1541/2016/nhess-16-1541-2016.pdf |
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