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Evaluating temporal changes in hydraulic conductivities near karst-terrain dams: Dokan Dam (Kurdistan-Iraq)

Dafny, Elad, Tawfeeq, Kochar Jamal and Ghabraie, Kazem 2015, Evaluating temporal changes in hydraulic conductivities near karst-terrain dams: Dokan Dam (Kurdistan-Iraq), Journal of hydrology, vol. 529, no. Part 1, pp. 265-275, doi: 10.1016/j.jhydrol.2015.07.048.

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Title Evaluating temporal changes in hydraulic conductivities near karst-terrain dams: Dokan Dam (Kurdistan-Iraq)
Author(s) Dafny, Elad
Tawfeeq, Kochar Jamal
Ghabraie, KazemORCID iD for Ghabraie, Kazem orcid.org/0000-0002-1043-3403
Journal name Journal of hydrology
Volume number 529
Issue number Part 1
Start page 265
End page 275
Total pages 11
Publisher Elsevier B V
Place of publication Amsterdam, The Netherlands
Publication date 2015-10
ISSN 0022-1694
Keyword(s) hydraulic conductivity
dam
karst
temporal changes
seepage modeling
Summary Dam sites provide an outstanding opportunity to explore dynamic changes in the groundwater flow regime because of the high hydraulic gradient rapidly induced in their surroundings. This paper investigates the temporal changes of the hydraulic conductivities of the rocks and engineered structures via a thorough analysis of hydrological data collected at the Dokam Dam, Iraq, and a numerical model that simulates the Darcian component of the seepage. Analysis of the data indicates increased seepage with time and suggests that the hydraulic conductivity of the rocks increased as the conductivity of the grout curtain decreased. Conductivity changes on the order of 10-8m/s, in a 20-yr period were quantified using the numerical analysis. It is postulated that the changes in hydraulic properties in the vicinity of Dokan Dam are due to suspension of fine materials, interbedded in small fissures in the rocks, and re-settlement of these materials along the curtain. Consequently, the importance of the grout curtain to minimize the downstream seepage, not only as a result of the conductivity contrast with the rocks, but also as a barrier to suspended clay sediments, is demonstrated. The numerical analysis also helped us to estimate the proportion of the disconnected karstic conduit flow to the overall flow.
Language eng
DOI 10.1016/j.jhydrol.2015.07.048
Field of Research 090506 Structural Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30084200

Document type: Journal Article
Collection: School of Engineering
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