Detecting submarine groundwater discharge with synoptic surveys of sediment resistivity, radium, and salinity

Mathematics – Logic

Scientific paper

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Hydrology: Groundwater/Surface Water Interaction, Marine Geology And Geophysics: Marine Hydrogeology, Oceanography: Biological And Chemical: Radioactivity And Radioisotopes, Exploration Geophysics: Magnetic And Electrical Methods (5109), Geochemistry: Instruments And Techniques

Scientific paper

A synoptic geophysical and geochemical survey was used to investigate the occurrence and spatial distribution of submarine discharges of water to upper Nueces Bay, Texas. The 17 km survey incorporated continuous resistivity profiling; measurements of surface water salinity, temperature, and dissolved oxygen; and point measurements of dissolved Ra isotopes. The survey revealed areas of interleaving, vertical fingers of high and low conductivity extending up through 7 m of bay bottom sediments into the surface water, located within 100 m of surface salinity and dissolved Ra maxima along with peaks in water temperature and lows in dissolved oxygen. These results indicate either brackish submarine groundwater discharge or the leakage of oil field brine from submerged petroleum pipelines.

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