| Abstract: | In addition to variable density flow, the lateral and vertical heterogeneity of submarine sediments creates important controls on coastal aquifer systems. Submarine confining units produce semi-confined offshore aquifers that are recharged on shore. These low-permeability deposits are usually either late Pleistocene to Holocene in age, or date to the period of the last interglacial highstand. Extensive confining units consisting of peat form in tropical mangrove swamps, and in salt marshes and freshwater marshes and swamps at mid-latitudes. At higher latitudes, fine-grained glaciomarine sediments are widespread. The net effect of these shallow confining units is that groundwater from land often flows farther offshore before discharging than would normally be expected. In many settings, the presence of such confining units is critical to determining how and where pollutants from land will be discharged into coastal waters. Alternatively, these confining units may also protect fresh groundwater supplies from saltwater intrusion into coastal wells. |
| Genre: | Conference Paper |
| ProdID: | 70033633 |
| Citation Author: | Bratton, J. F. |
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| Citation End Page: | 36 |
| Citation Issue: | 312 |
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| Citation Language: | English |
| Citation Larger Work Title: | IAHS-AISH Publication |
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| Citation Number Of Pages: | 9 |
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| Citation Search Results Text: | The importance of shallow confining units to submarine groundwater flow; 2007; Conference Paper; IAHS-AISH Publication; Bratton, J. F. |
| Citation Start Page: | 28 |
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| Citation Year: | 2007 |
| Type: | citation/reference |
| Text: | The importance of shallow confining units to submarine groundwater flow; 2007; Conference Paper; IAHS-AISH Publication; Bratton, J. F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 2007 00:00 -0600 |
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