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...
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Autor*in:	H. Wei [verfasserIn] M. Yu [verfasserIn] D. Wang [verfasserIn] Y. Li [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2016

Übergeordnetes Werk:	In: Natural Hazards and Earth System Sciences - Copernicus Publications, 2004, 16(2016), 7, Seite 1541-1551
Übergeordnetes Werk:	volume:16 ; year:2016 ; number:7 ; pages:1541-1551

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc Journal toc

DOI / URN:	10.5194/nhess-16-1541-2016

Katalog-ID:	DOAJ074023535

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author	H. Wei
spellingShingle	H. Wei misc TD1-1066 misc GE1-350 misc QE1-996.5 misc Environmental technology. Sanitary engineering misc Geography. Anthropology. Recreation misc G misc Environmental sciences misc Geology Overtopping breaching of river levees constructed with cohesive sediments
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title	Overtopping breaching of river levees constructed with cohesive sediments
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title_full	Overtopping breaching of river levees constructed with cohesive sediments
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title_sort	overtopping breaching of river levees constructed with cohesive sediments
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title_auth	Overtopping breaching of river levees constructed with cohesive sediments
abstract	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.
abstractGer	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.
abstract_unstemmed	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.
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title_short	Overtopping breaching of river levees constructed with cohesive sediments
url	https://doi.org/10.5194/nhess-16-1541-2016 https://doaj.org/article/987e256618044c66906a430e32406a75 http://www.nat-hazards-earth-syst-sci.net/16/1541/2016/nhess-16-1541-2016.pdf https://doaj.org/toc/1561-8633 https://doaj.org/toc/1684-9981
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Overtopping breaching of river levees constructed with cohesive sediments

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