2014 Volume 70 Issue 2 Pages I_1020-I_1025
Matsukawaura inlet in Fukushima Prefecture, Japan is located north side of Sendai Bay. Freshwater discharge including underwater flow into Matsukawaura inlet is estimated by a water budget method. The river flow is estimated as much as 1.1×108 m3 /yr. On the other hand, the groundwater flow is estimated as much as 8.2×106 m3 /yr. The river discharge and groundwater discharge into Matsukawaura inlet are estimated as 93.1 % and 6.9 %, respectively. The subaerial topography around an entrance is characterized by a flood tidal shoal and a connected channel, but not an ebb tidal shoal. Three dimensional water velocity distributions at an ebb tide are measured. Horizontal velocity distributions in surface layer and bottom layer were similar and the highest velocity was approximately 1.0 m/s during the field study. In addition, Chlorophyll-a concentration was ranged from 0.1to 9.9 μg/ℓ, and mean value was 3.6 μg/ℓ.
