Spatial variability of submarine groundwater discharge,Ubatuba, Brazil |
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Authors: | Thomas Stieglitz Makoto Taniguchi Skyler Neylon |
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Institution: | 1. Marine Geophysical Laboratory, School of Mathematical and Physical Sciences, James Cook University, Townsville, Qld, Australia;2. Australian Institute of Marine Science, Townsville, Qld, Australia;3. Research Institute for Humanity and Nature, Kyoto, Japan;4. Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, LA, USA |
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Abstract: | Submarine groundwater discharge (SGD) is delivered into the oceans at various hydrogeological settings. Where coastal aquifers have spatial heterogeneous properties such as preferential flowpaths, SGD is also commonly heterogeneously distributed along the coast. SGD from a heterogeneous, fractured rock aquifer on the Ubatuba coast, Brazil has been investigated by depth profiling of ground conductivity. On spatial scales of <10 m, a significant variation in sub-surface conductivity and associated discharge rate is documented. These geophysical observations were used to identify preferential flowpaths, and to explain significant differences in average discharge rates observed in seepage meter records placed only a few metres apart from each other. This paper illustrates the utility of sub-surface conductivity measurements for accurate investigations of SGD fluxes. |
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Keywords: | conductivity sensors hydrology spatial variations groundwater coastal zone Brazil |
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