KFU. Card publication. Clogging of toe drain drastically affects phreatic seepage in earth dams.

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FEDERAL UNIVERSITY

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CLOGGING OF TOE DRAIN DRASTICALLY AFFECTS PHREATIC SEEPAGE IN EARTH DAMS.

Form of presentation

Articles in international journals and collections

Year of publication

2024

Язык

русский

Authors, employees of KFU

Obnosov Yuriy Viktorovich, author

Other authors

Al-Maktomi Ali , author

Al-Yaqoubi Shahad , author

Kacimov Anvar Rashidovich, author

Bibliographic description in the original language

Shahad A Al-Yaqoubi, Ali Al-Maktoumi, Yurii Obnosov, Anvar Kacimov. Clogging of toe drain drastically affects phreatic seepage in earth dams. Advances in Water Resources (Elsevier), 190 (2024) 104737 (WoS IF=4.51, Q1)

Annotation

In aged levees, toe (blanket) drains get clogged with time due to seepage-induced suffusion and translocation of fine soil fractions from the upstream to the downstream part of the embankment. These particles deposit on the top of the drain (usually, Terzhagi's graded gravel) as a cake. Also, high hydraulic gradients in the vicinity of the drain move the fine particles into the body of the coarse filter material such that “internal colmation” takes place. In this paper 2-D seepage to a clogged drain is studied experimentally, analytically and numerically. In a sandbox, we illustrate the difference in the position of a phreatic surface and the seepage flow rate between an equipotential toe drain and a clogged one. In the analytical solution, a potential flow model is used and the Newmann (Kirkham-Brock) boundary condition on the clogged drain surface (horizontal segment) is imposed. A circular triangle is mapped conformally onto a reference half-plane, where Hilbert's boundary value problem for a holomorphic function is solved. For a given size of the levee, clogging causes a significant rise of the phreatic surface, although the seepage flow rate drops. In HYDRUS2-D simulations, a FEM-meshed Richards' equation for a saturated-unsaturated 2-D flow is used for solving in a composite polygon, which mimics a vertical cross-section of a rectangular levee and a clogged-colmated blanket drain. Numerical results are in rough agreement with the analytical model.

Keywords

earth dam, phreatic surface, 2-D seepage, clogged filter, sandbox experiments, analytical solution by complex potential-hodograph method, HYDRUS2-D simulations

The name of the journal

Advances in Water Resources

URL

https://doi.org/10.1016/j.advwatres.2024.104737

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=300904&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Obnosov Yuriy Viktorovich	ru_RU
dc.contributor.author	Al-Maktomi Ali	ru_RU
dc.contributor.author	Al-Yaqoubi Shahad	ru_RU
dc.contributor.author	Kacimov Anvar Rashidovich	ru_RU
dc.date.accessioned	2024-01-01T00:00:00Z	ru_RU
dc.date.available	2024-01-01T00:00:00Z	ru_RU
dc.date.issued	2024	ru_RU
dc.identifier.citation	Shahad A Al-Yaqoubi, Ali Al-Maktoumi, Yurii Obnosov, Anvar Kacimov. Clogging of toe drain drastically affects phreatic seepage in earth dams. Advances in Water Resources (Elsevier), 190 (2024) 104737 (WoS IF=4.51, Q1)	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=300904&p_lang=2	ru_RU
dc.description.abstract	Advances in Water Resources	ru_RU
dc.description.abstract	In aged levees, toe (blanket) drains get clogged with time due to seepage-induced suffusion and translocation of fine soil fractions from the upstream to the downstream part of the embankment. These particles deposit on the top of the drain (usually, Terzhagi's graded gravel) as a cake. Also, high hydraulic gradients in the vicinity of the drain move the fine particles into the body of the coarse filter material such that “internal colmation” takes place. In this paper 2-D seepage to a clogged drain is studied experimentally, analytically and numerically. In a sandbox, we illustrate the difference in the position of a phreatic surface and the seepage flow rate between an equipotential toe drain and a clogged one. In the analytical solution, a potential flow model is used and the Newmann (Kirkham-Brock) boundary condition on the clogged drain surface (horizontal segment) is imposed. A circular triangle is mapped conformally onto a reference half-plane, where Hilbert's boundary value problem for a holomorphic function is solved. For a given size of the levee, clogging causes a significant rise of the phreatic surface, although the seepage flow rate drops. In HYDRUS2-D simulations, a FEM-meshed Richards' equation for a saturated-unsaturated 2-D flow is used for solving in a composite polygon, which mimics a vertical cross-section of a rectangular levee and a clogged-colmated blanket drain. Numerical results are in rough agreement with the analytical model.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	earth dam	ru_RU
dc.subject	phreatic surface	ru_RU
dc.subject	2-D seepage	ru_RU
dc.subject	clogged filter	ru_RU
dc.subject	sandbox experiments	ru_RU
dc.subject	analytical solution by complex potential-hodograph method	ru_RU
dc.subject	HYDRUS2-D simulations	ru_RU
dc.title	Clogging of toe drain drastically affects phreatic seepage in earth dams.	ru_RU
dc.type	Articles in international journals and collections	ru_RU