Tentative estimation of a submarine groundwater discharge by a water and salt budget analysis based on hydrographical observations offshore of Omae Beach, Osaka Bay, Japan
2009
Hayashi, M., Kobe Univ. (Japan) | Taniguchi, M. | Yamada, H.
A submarine groundwater discharge was estimated by water and salt budget analysis based on hydrographical observations offshore of Omae Beach, Osaka Bay, Japan. Those observations were carried out from August 22 to 23, 2006. The estimated submarine groundwater discharge and through-flow on the boundary sections were compared with observed submarine groundwater discharge and current speeds as well as with the results of tidal current simulation by POM. The difference between variations in water volume estimated by the observed water level and the calculated result was less than 0.3%. Estimated through-flows on the boundary section qualitatively agreed with the results of the tidal current simulation. Estimated submarine groundwater discharge was 5 times the observed discharge. This will be recognized when various factors are considered. This method is available for estimating the submarine groundwater discharge over an entire target area. The water budget of this area during the period studied was dominated by the through-flow. Sea water continuously flowed in from the southern boundary, influenced by not only the tidal current but also by the residual current. An outflow that corresponded to a tidal change was observed in the eastern boundary. The contribution of submarine groundwater discharge to volume variations in the area was estimated at 5 to 8%.
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