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CMG/WRD Cooperative Research and Talks
On December 13, Frank Manheim (CMG and EMRT/Reston) delivered a presentation at WRD's new New England District Office in Northborough, MA. The subject was cooperation with WRD and state researchers on the problem of submarine discharge of excess nutrients to the Rehoboth and Indian River Bays. Due to a major chicken-farming industry on the Delmarva Peninsula, the Delaware Bays (Rehoboth and Indian River) and the adjoining Assawoman Bay have among the highest ground-water-nutrient concentrations in coastal areas of the U.S. For example, whereas raw sewage has about 55 mg/l nitrate-N, ground waters near the bays have recorded up to 150 mg/l nitrate-N. A recent Delaware State nutrient management project reported that Indian River Bay may receive up to two times more nutrients from all sources than its capacity to accept them. The role of submarine discharge of nutrient-rich water into the bays is thought to be potentially large, but the pathways and volumes are poorly known. The CMG project contributes by accumulating geological framework data pertinent to this problem. Data are acquired using a specially designed database and displayed in GIS format (Laura Hayes, WHFC). The historic data are being integrated with new field information and other data types to contribute to a research consortium from the University of Delaware, WRD Delaware (David Krantz), and the Delaware Geological Survey (DGS). DGS researchers recently identified thermal anomalies attributed to submarine discharge by aircraft-based infrared surveys. When the University of Delaware completes its boat development, USGS will mobilize a new multichannel resistivity streamer system in conjunction with acoustic profiling. Ironically, on the same day, Dennis LeBlanc from the Northborough Office traveled to Woods Hole to present a talk on the WRD research on groundwater problems on Cape Cod. These talks are part of a new exchange series between the CMG and WRD offices.
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U. S. Department of the Interior | U.S. Geological SurveySound Waves Monthly Newsletter
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Updated December 02, 2016 @ 12:09 PM (THF)