Abstract
The Atsumi Peninsula is located 60 km southeast of Nagoya City, and extends in the direction of ENE-WSW. Its maximum length is 35km and the maximum width is 7km.
Bed rock of this peninsula consists of Palaeozoic chert and covered with unconsolidated sand, gravel, silt and mud. The total thickness of unconsolidated rocks is 100m or more and sand and gravel layers contain groundwater, which was originally confined but has changed to unconfined groundwater due to the increased pumping in recent years.
The aquifer slopes toward the center of the Atsumi Bay. Its average specific yield is 324m3/d/m, for wells of 0.15-0.38m in diameter. The relation between T and Q/S is T=1. 15 Q/S in which T: transmissivility in m3/d/m, S: drawdown, in meter, Q a discharge of pumped well, in m3/d. The unit storage of groundwater in this area is estimated as 10.3×106m3/km2.
