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Effects of Aquifer Bed Slope and Sea Level on Saltwater Intrusion in Coastal Aquifers

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Department of Water and Water Structures Engineering, Faculty of Engineering, Zagazig University, Zagazig 44519, Egypt
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Civil Engineering Department, College of Engineering, Shaqra University, Dawadmi 11911, Saudi Arabia
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National Water Center, United Arab Emirates University, Al Ain P.O. Box 15551, UAE
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Author to whom correspondence should be addressed.
Hydrology 2020, 7(1), 5; https://doi.org/10.3390/hydrology7010005
Received: 8 November 2019 / Revised: 16 December 2019 / Accepted: 18 December 2019 / Published: 31 December 2019
The quality of groundwater resources in coastal aquifers is affected by saltwater intrusion. Over-abstraction of groundwater and seawater level rise due to climate change accelerate the intrusion process. This paper investigates the effects of aquifer bed slope and seaside slope on saltwater intrusion. The possible impacts of increasing seawater head due to sea level rise and decreasing groundwater level due to over-pumping and reduction in recharge are also investigated. A numerical model (SEAWAT) is applied to well-known Henry problem to assess the movement of the dispersion zone under different settings of bed and seaside slopes. The results showed that increasing seaside slope increased the intrusion of saltwater by 53.2% and 117% for slopes of 1:1 and 2:1, respectively. Increasing the bed slope toward the land decreased the intrusion length by 2% and 4.8%, respectively. On the other hand, increasing the bed slope toward the seaside increased the intrusion length by 3.6% and 6.4% for bed slopes of 20:1 and 10:1, respectively. The impacts of reducing the groundwater level at the land side and increasing the seawater level at the shoreline by 5% and 10% considering different slopes are studied. The intrusion length increased under both conditions. Unlike Henry problem, the current investigation considers inclined beds and sea boundaries and, hence, provides a better representation of the field conditions. View Full-Text
Keywords: coastal aquifer; seaside slope; bed slope; sea level; seawater intrusion; SEAWAT coastal aquifer; seaside slope; bed slope; sea level; seawater intrusion; SEAWAT
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Abd-Elhamid, H.F.; Abd-Elaty, I.; Sherif, M.M. Effects of Aquifer Bed Slope and Sea Level on Saltwater Intrusion in Coastal Aquifers. Hydrology 2020, 7, 5.

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