Seawater intrusion in coastal aquifers: Effects of seasonal variations in extraction and recharge rates
2001 (English)In: SWICA M3 Cyber Proceedings of First International Conference on Saltwater Intrusion and Coastal Aquifers - Monitoring, Modeling and Management / [ed] Ouazar, D. and Cheng, A.H.-D., 2001, 1-11 p.Conference paper (Refereed)
Over-exploitation of coastal aquifers causes seawater intrusion and eventuallycontamination of groundwater wells in many parts of the world. Artificial recharge oftreated wastewater can be used to avoid or control seawater intrusion. A commoncharacteristic of many coastal areas in Southern Europe is that most of the annualwater demand, and hence the amount of water that can be used for artificial recharge,is concentrated to a few summer months, whereas natural groundwater recharge takesplace during the winter months. This paper addresses the effects of seasonal variationsin pumping, as well as in artificial and natural recharge rates on the dynamics ofsaltwater intrusion and especially on the evolution of salinity in extractedgroundwater. Specifically, numerical simulations are performed to examine theseasonal variability effects for a given set of extraction and recharge locations, but forscenarios with different artificial recharge rates. Parameter values for describing theaquifer and its hydraulic-hydrological properties are taken from a coastal aquifer inIsrael. We show that predicted salinity in extracted groundwater under assumedtemporally constant pumping and recharge conditions differs from the mean value ofsalinity under seasonally variable conditions. For long-term predictions, theassumption of temporally constant conditions may yield relatively small (less than10%) over- or underestimation of average salinity during the periodic steady-statestage that results from seasonally variable conditions. For short-term predictions, upto the common planning period of 25 years after starting a new groundwatermanagement practice, the same assumption may lead to considerable (50-55%)underestimation of maximum salinity values under seasonally variable conditions.
Place, publisher, year, edition, pages
2001. 1-11 p.
Seawater intrusion, seasonal variability, artificial recharge
IdentifiersURN: urn:nbn:se:kth:diva-5140OAI: oai:DiVA.org:kth-5140DiVA: diva2:7938
QC 201010122005-05-252005-05-252010-10-12Bibliographically approved