Optimal Water Allocation from Subsurface Dams: A Risk-Based Optimization Approach

Izady, A; Khorshidi, MS; Nikoo, MR; Al-Maktoumi, A; Chen, M; Al-Mamari, H; Gandomi, AH

Optimal Water Allocation from Subsurface Dams: A Risk-Based Optimization Approach

Izady, A Khorshidi, MS Nikoo, MR Al-Maktoumi, A Chen, M Al-Mamari, H Gandomi, AH

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Publisher:: Springer
Publication Type:: Journal Article
Citation:: Water Resources Management, 2021, 35, (12), pp. 4275-4290
Issue Date:: 2021-09-01

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Field	Value	Language
dc.contributor.author	Izady, A
dc.contributor.author	Khorshidi, MS
dc.contributor.author	Nikoo, MR
dc.contributor.author	Al-Maktoumi, A
dc.contributor.author	Chen, M
dc.contributor.author	Al-Mamari, H
dc.contributor.author	Gandomi, AH
dc.date.accessioned	2022-03-31T00:04:21Z
dc.date.available	2022-03-31T00:04:21Z
dc.date.issued	2021-09-01
dc.identifier.citation	Water Resources Management, 2021, 35, (12), pp. 4275-4290
dc.identifier.issn	0920-4741
dc.identifier.issn	1573-1650
dc.identifier.uri	http://hdl.handle.net/10453/155733
dc.description.abstract	Subsurface dams, strongly advocated in the 1992 United Nations Agenda-21, have been widely studied to increase groundwater storage capacity. However, an optimal allocation of augmented water with the construction of the subsurface dams to compensate for the water shortage during dry periods has not so far been investigated. This study, therefore, presents a risk-based simulation–optimization framework to determine optimal water allocation with subsurface dams, which minimizes the risk of water shortage in different climatic conditions. The developed framework was evaluated in Al-Aswad falaj, an ancient water supply system in which a gently sloping underground channel was dug to convey water from an aquifer via the gravity force to the surface for irrigation of downstream agricultural zones. The groundwater dynamics were modeled using MODFLOW UnStructured-Grid. The data of boreholes were used to generate a three-dimensional stratigraphic model, which was used to define materials and elevations of five-layer grid cells. The validated groundwater model was employed to assess the effects of the subsurface dam on the discharge of the falaj. A Conditional Value-at-Risk optimization model was also developed to minimize the risk of water shortage for the augmented discharge on downstream agricultural zones. Results show that discharge of the falaj is significantly augmented with a long-term average increase of 46.51%. Moreover, it was found that the developed framework decreases the water shortage percentage in 5% of the worst cases from 87%, 75%, and 32% to 53%, 32%, and 0% under the current and augmented discharge in dry, normal, and wet periods, respectively.
dc.language	English
dc.publisher	Springer
dc.relation.ispartof	Water Resources Management
dc.relation.isbasedon	10.1007/s11269-021-02946-9
dc.rights	The final publication is available at Springer via http://dx.doi.org/ 10.1007/s11269-021-02946-9
dc.rights	info:eu-repo/semantics/openAccess
dc.subject.classification	Environmental Engineering
dc.title	Optimal Water Allocation from Subsurface Dams: A Risk-Based Optimization Approach
dc.type	Journal Article
utslib.citation.volume	35
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
dc.date.updated	2022-03-31T00:04:18Z
pubs.issue	12
pubs.publication-status	Published
pubs.volume	35
utslib.citation.issue	12

Abstract:

Subsurface dams, strongly advocated in the 1992 United Nations Agenda-21, have been widely studied to increase groundwater storage capacity. However, an optimal allocation of augmented water with the construction of the subsurface dams to compensate for the water shortage during dry periods has not so far been investigated. This study, therefore, presents a risk-based simulation–optimization framework to determine optimal water allocation with subsurface dams, which minimizes the risk of water shortage in different climatic conditions. The developed framework was evaluated in Al-Aswad falaj, an ancient water supply system in which a gently sloping underground channel was dug to convey water from an aquifer via the gravity force to the surface for irrigation of downstream agricultural zones. The groundwater dynamics were modeled using MODFLOW UnStructured-Grid. The data of boreholes were used to generate a three-dimensional stratigraphic model, which was used to define materials and elevations of five-layer grid cells. The validated groundwater model was employed to assess the effects of the subsurface dam on the discharge of the falaj. A Conditional Value-at-Risk optimization model was also developed to minimize the risk of water shortage for the augmented discharge on downstream agricultural zones. Results show that discharge of the falaj is significantly augmented with a long-term average increase of 46.51%. Moreover, it was found that the developed framework decreases the water shortage percentage in 5% of the worst cases from 87%, 75%, and 32% to 53%, 32%, and 0% under the current and augmented discharge in dry, normal, and wet periods, respectively.

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http://hdl.handle.net/10453/155733