Evaluating temporal changes in hydraulic conductivities near karst-terrain dams: Dokan Dam (Kurdistan-Iraq)
Article
Article Title | Evaluating temporal changes in hydraulic conductivities near |
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ERA Journal ID | 1949 |
Article Category | Article |
Authors | Dafny, Elad (Author), Tawfeeq, Kochar Jamal (Author) and Ghabraie, Kazem (Author) |
Journal Title | Journal of Hydrology |
Journal Citation | 529 (Part 1), pp. 265-275 |
Number of Pages | 11 |
Year | 2015 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0022-1694 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.jhydrol.2015.07.048 |
Abstract | 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 10-8 m/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 |
Keywords | hydraulic conductivity; dam; karst; temporal changes; seepage modeling |
ANZSRC Field of Research 2020 | 490302. Numerical analysis |
370799. Hydrology not elsewhere classified | |
400513. Water resources engineering | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | School of Civil Engineering and Surveying |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q3117/evaluating-temporal-changes-in-hydraulic-conductivities-near-karst-terrain-dams-dokan-dam-kurdistan-iraq
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