隣接する地下水流域間の地下水流入出に関する研究

抄録

  This study examined the geological structure and groundwater flow at the basin boundaries in Shirakawata basin and Higashi-soedo basin, the basin of main drinking water source of Miyako Island. From the results of the boring survey and the vertical electrical sounding, in northwestern part of Shirakawata basin, it was found a new continuous of groundwater with adjacent Higashi-soedo basin. In the northern part and northwest part of Higashi-soedo basin where the connection was pointed out with the adjacent basin, the situation was confirmed, and more detailed aquifer shape was revealed. Also, it became clear that the groundwater flowed out to the adjacent basin at these basin boundaries from the slope of groundwater surface in the vicinity. We estimated the outflow amount at these basin boundaries, from the cross sectional area of the outflow part, the hydraulic gradient of the groundwater, and the coefficient of permeability.