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Abstract
In order to explore submarine groundwater discharge in the vicinity of karst features that penetrate the confining layer of an offshore, partially confined aquifer, we constructed a three-dimensional groundwater model using the SUTRA (Saturated-Unsaturated TRAnsport) variable-density groundwater flow model. We ran a parameter sensitivity analysis, testing the effects of recharge rates, permeabilities of the aquifer and confining layer, and thickness of the confining layer. In all simulations, less than 20% of the freshwater recharge for the entire model exits through the sinkhole. Recirculated seawater usually accounts for 10-30% of the total outflow from the model. Often, the sinkhole lies seaward of the transition zone and acts as a recharge feature for recirculating seawater. The permeability ratio between aquifer and confining layer influences the configuration of the freshwater wedge the most; as confining layer permeability decreases, the wedge lengthens and the fraction of total discharge exiting through the sinkhole increases. Copyright ?? 2007 IAHS Press.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Effect of an offshore sinkhole perforation in a coastal confined aquifer on submarine groundwater discharge |
| ISBN | 9781901502046 |
| Issue | 312 |
| Year Published | 2007 |
| Language | English |
| Larger Work Title | IAHS-AISH Publication |
| First page | 256 |
| Last page | 263 |
| Conference Title | International Symposium: A New Focus on Groundwater - Seawater Interactions - 24th General Assembly of the In |
| Conference Location | Perugia |
| Conference Date | 2 July 2007 through 13 July 2007 |
| Google Analytic Metrics | Metrics page |