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University of Hawaii team reports new geophysical and tracer results suggesting deeper freshwater flow paths near Red Hill
Summary
SOEST researchers described gravity, resistivity and controlled‑source electromagnetic surveys along with dye tracer and in‑well flow measurements that indicate deeper, freshened groundwater pathways and provide data for updated groundwater models.
Don Thomas of the University of Hawai‘i School of Ocean and Earth Science and Technology (SOEST) briefed FTAC on Oct. 1 about multi‑method studies intended to improve understanding of groundwater flow around Red Hill and Pearl Harbor.
Thomas summarized geophysical work — gravity, resistivity and controlled‑source electromagnetic surveys — that the research team used to map subsurface structures and to distinguish salt‑saturated rock from zones of fresher groundwater. ‘‘In this case ... we have a significant freshwater saturated zone at a depth of, say, 75 meters down to about 225…
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