Saltwater dynamics due to cut-off wall installation in coastal unconfined aquifers : Experimental and numerical studies
Luyun, R. ; Momii, K. ; Nakagawa, K. LU
and Fujiyama, S.
(2008)
International Conference on Calibration and Reliability in Groundwater Modelling: Credibility of Modelling, ModelCARE2007
p.214-219
- Abstract
In the construction of subsurface dams in coastal aquifers, investigations of the movement and removal of residual saltwater in the storage area are not usually carried out because of difficulties in monitoring. Experimental and numerical studies were thus performed to understand the saltwater dynamics due to the installation of cut-off walls. Experimental results for cut-off walls with opening on the upper part of the aquifer showed the initial advance, gradual retreat and attenuation, and complete removal of the residual saltwater. A shorter cut-off wall exhibited faster attenuation of residual saltwater than a higher cutoff wall. Numerical simulation using SEAWAT verified the experimental results. Flow patterns showed dispersed... (More)
In the construction of subsurface dams in coastal aquifers, investigations of the movement and removal of residual saltwater in the storage area are not usually carried out because of difficulties in monitoring. Experimental and numerical studies were thus performed to understand the saltwater dynamics due to the installation of cut-off walls. Experimental results for cut-off walls with opening on the upper part of the aquifer showed the initial advance, gradual retreat and attenuation, and complete removal of the residual saltwater. A shorter cut-off wall exhibited faster attenuation of residual saltwater than a higher cutoff wall. Numerical simulation using SEAWAT verified the experimental results. Flow patterns showed dispersed saltwater was carried by the freshwater discharge along the mixing zone and over the cut-off wall forming a circulation flow in the residual saltwater region, and eventually all the remaining saltwater in the storage area was flushed out. Numerical results also revealed a minimum cut-off wall height limit to achieve complete removal of the residual saltwater. For cut-off walls with opening on the lower part of the aquifer, experimental results showed that more effective attenuation of the saltwater wedge occurred with deeper cutoff wall penetration, which is in general agreement with numerical results.
(Less)
- author
- Luyun, R.
; Momii, K.
; Nakagawa, K.
LU
and Fujiyama, S.
- publishing date
- 2008-11-07
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- Coastal aquifer, Cut-off wall, Saltwater intrusion, SEAWAT, Subsurface dam
- host publication
- Proceedings of an International Conference on Calibration and Reliability in Groundwater Modelling : Credibility of Modelling, ModelCARE2007 - Credibility of Modelling, ModelCARE2007
- edition
- 320
- pages
- 6 pages
- conference name
- International Conference on Calibration and Reliability in Groundwater Modelling: Credibility of Modelling, ModelCARE2007
- conference location
- Copenhagen, Denmark
- conference dates
- 2007-09-09 - 2007-09-13
- external identifiers
-
- scopus:55249083530
- ISBN
- 9781901502497
- language
- English
- LU publication?
- no
- id
- 3a3dd45e-3aff-4172-9ca0-35a0990cb313
- date added to LUP
- 2019-01-02 01:33:40
- date last changed
- 2022-01-31 08:10:45
@inproceedings{3a3dd45e-3aff-4172-9ca0-35a0990cb313,
abstract = {{<p>In the construction of subsurface dams in coastal aquifers, investigations of the movement and removal of residual saltwater in the storage area are not usually carried out because of difficulties in monitoring. Experimental and numerical studies were thus performed to understand the saltwater dynamics due to the installation of cut-off walls. Experimental results for cut-off walls with opening on the upper part of the aquifer showed the initial advance, gradual retreat and attenuation, and complete removal of the residual saltwater. A shorter cut-off wall exhibited faster attenuation of residual saltwater than a higher cutoff wall. Numerical simulation using SEAWAT verified the experimental results. Flow patterns showed dispersed saltwater was carried by the freshwater discharge along the mixing zone and over the cut-off wall forming a circulation flow in the residual saltwater region, and eventually all the remaining saltwater in the storage area was flushed out. Numerical results also revealed a minimum cut-off wall height limit to achieve complete removal of the residual saltwater. For cut-off walls with opening on the lower part of the aquifer, experimental results showed that more effective attenuation of the saltwater wedge occurred with deeper cutoff wall penetration, which is in general agreement with numerical results.</p>}},
author = {{Luyun, R. and Momii, K. and Nakagawa, K. and Fujiyama, S.}},
booktitle = {{Proceedings of an International Conference on Calibration and Reliability in Groundwater Modelling : Credibility of Modelling, ModelCARE2007}},
isbn = {{9781901502497}},
keywords = {{Coastal aquifer; Cut-off wall; Saltwater intrusion; SEAWAT; Subsurface dam}},
language = {{eng}},
month = {{11}},
pages = {{214--219}},
title = {{Saltwater dynamics due to cut-off wall installation in coastal unconfined aquifers : Experimental and numerical studies}},
year = {{2008}},
}