scholarly journals Pumping management of coastal aquifers using analytical models of saltwater intrusion

2003 ◽  
Vol 39 (12) ◽  
Author(s):  
Aristotelis Mantoglou
Keyword(s):  
Coastal Aquifers ◽  
Saltwater Intrusion ◽  
Analytical Models

Assessment of Saltwater Intrusion Vulnerability in the Coastal Aquifers in Ninh Thuan, Vietnam

2021 ◽  
pp. 703-712
Author(s):  
Quy Nhan Pham ◽  
Thi Thoang Ta ◽  
Thanh Le Tran ◽  
Thi Thu Pham ◽  
The Chuyen Nguyen
Keyword(s):  
Coastal Aquifers ◽  
Saltwater Intrusion

A note on saltwater intrusion in coastal aquifers

1990 ◽  
Vol 4 (2) ◽  
pp. 123-134 ◽  
Author(s):  
M. Sherif Mohsen ◽  
Vijay P. Singh ◽  
Abdelwahab M. Amer
Keyword(s):  
Coastal Aquifers ◽  
Saltwater Intrusion

scholarly journals Analysis of Saline Intrusion into a Coastal Aquifer: A Case History of Legacy Issues and Challenges to Water Security

2018 ◽  
Vol 8 (2) ◽  
pp. 16 ◽  
Author(s):  
Nara Somaratne ◽  
Glyn Ashman
Keyword(s):  
Seawater Intrusion ◽  
Coastal Aquifers ◽  
Coastal Aquifer ◽  
Discharge Rate ◽  
Analytical Models ◽  
Original Position ◽  
Saline Intrusion ◽  
Groundwater Extraction ◽  
Supply Source ◽  
Freshwater Lenses

Coastal aquifers are subject to seawater intrusion. Therefore, managing freshwater aquifers in coastal areas remain challenging. At present, determining safe yields from the coastal aquifers to prevent seawater intrusion is primarily based on the use of numerical simulation-optimization models or by the use of analytical models based on the Ghyben-Herzberg principle. This study examines the cause and effects of seawater intrusion into a coastal aquifer, Lincoln Basin in southern Eyre Peninsula, South Australia and shows that application of simple techniques would have prevented seawater intrusion. Three freshwater lenses, Lincoln A, B, and C of the Lincoln Basin, located about 13 km southwest of Port Lincoln township, have been developed as a town water supply source in 1960. The capacity of the basin has been assessed by three long-term pumping tests. Based on pump tests results, three areas were developed to supply 2×106 m3 per year distributed across three lenses as lens A : four wells to supply 0.84×106 m3, lens B: four wells to supply 0.5×106 m3 and lens C: four wells to supply 0.66 ×106 m3. Neither recharge to the freshwater lenses nor a water balance had been assessed, and a precautionary approach to groundwater extraction was not followed. The apparent driver for managing the basin was demand for the township. In this study, we assessed the recharge using two methods; water-table fluctuation (WTF) and the conventional chloride mass balance (CMB) method. Total recharge to the freshwater lenses is estimated at 1.6×106 m3 per year which is less than the average annual groundwater extraction from the basin during the 1961-1977 periods (average 2.14×106 m3). As a result mining of the groundwater storage has occurred in the basin leading to saline intrusion, upconing and lateral flow of brackish water into wellfield areas. The total volume extracted from the basin was 35×106 m3, which exceeded the average recharge over the 15 year period, 24×106 m3. Using analytical methods, the seawater/freshwater interface movement from its original position was estimated to be 35 m in lens A, 337 m in lens B and 188 m in lens C. For each pumping well at maximum discharge rate, the transient interface location directly underneath the well was calculated. This results in interface rises under pumping wells in lens A of 3.8 m, lens B of 0.5 m, and in lens C about 0.7 m. According to the risk-based groundwater allocation method, maximum extraction would have been as a proportion of 25% of the annual recharge. Thus, maximum annual abstraction limits for lens A, B and C would have been 210×103 m3, 72×103 m3 and 130×103 m3, totaling 412×103 m3.

Twenty five years of operational experience using GW modeling to evaluate sustainable use of coastal aquifers for major water supplies

2015 ◽  
Vol 10 (3) ◽  
pp. 465-473
Author(s):  
B. M. Harley ◽  
M. Gamache ◽  
K. K. Masterson ◽  
R. H. Fitzgerald
Keyword(s):  
Sustainable Development ◽  
Coastal Aquifers ◽  
Saltwater Intrusion ◽  
Large Scale ◽  
Groundwater Resources ◽  
Management Strategies ◽  
Operational Experience ◽  
Aquifer System ◽  
Southeastern Us ◽  
Groundwater Supply

The sustainable development and management of groundwater resources in coastal aquifers is complex and, historically, challenging to accomplish. Groundwater models play an essential role in addressing these complexities and providing the basis for planning future sustainable development. For more than 25 years, the authors have applied three-dimensional groundwater models to manage large scale coastal aquifers. The paper will present case studies demonstrating the application of groundwater models to evaluate conditions in complex coastal environments and to develop sustainable groundwater management strategies. These studies include Long Island, a sole source aquifer system in New York serving nearly 3 million people; aquifers in Southern California where injection barriers are used to prevent saltwater intrusion; and Savannah, Georgia in the southeastern US, where concentrated groundwater pumping has contributed to saltwater intrusion at a nearby resort island, and planning is underway to ensure a sustainable groundwater supply to both local industries and municipalities.

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