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

被引:10
作者
Izady, Azizallah [1 ]
Khorshidi, Mohammad Sadegh [1 ]
Nikoo, Mohammad Reza [2 ]
Al-Maktoumi, Ali [1 ,3 ]
Chen, Mingjie [1 ]
Al-Mamari, Hilal [1 ]
Gandomi, Amir H. [4 ]
机构
[1] Sultan Qaboos Univ, Water Res Ctr, Muscat, Oman
[2] Sultan Qaboos Univ, Dept Civil & Architectural Engn, Muscat, Oman
[3] Sultan Qaboos Univ, Coll Agr & Marine Sci, Dept Soils Water & Agr Engn, Muscat, Oman
[4] Univ Technol Sydney, Fac Engn & IT, Ultimo, NSW 2007, Australia
关键词
Subsurface dam; Water allocation; Conditional value-at-risk; Optimization; MODFLOW; Falaj; SUITABLE SITES; GROUNDWATER; CONSTRUCTION; FLUCTUATION; RESERVOIR; RECHARGE; QUALITY;
D O I
10.1007/s11269-021-02946-9
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
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.
引用
收藏
页码:4275 / 4290
页数:16
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