養浜砂浜海岸域における不圧地下水の動態観測とその意義 Field Observations of Unconfined Groundwater Dynamics in a Nourished Sand Beach
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This paper describes the evolutions of sea level and unconfined groundwater table in a nourished sand beach that were measured over one year. Careful time-series analyses identified seasonable variations of the sea level and of the groundwater levels at the three observation wells installed. The groundwater levels proved to be consistently higher landwards, indicating the fresh groundwater discharge (FGD) into the sea. The rate of the FGD was evaluated in two steps. First, the transmissivity of the unconfined aquifer was assessed through analyses of the measured fluctuations of the groundwater levels that responded systematically to four major tidal constituents. Then the identified aquifer constant was incorporated into theoretical equations of FGD and of the related seawater intrusion into the beach.
- PROCEEDINGS OF COASTAL ENGINEERING, JSCE
PROCEEDINGS OF COASTAL ENGINEERING, JSCE (54), 721-725, 2007
Japan Society of Civil Engineers