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日本冲绳县宫古岛的地质结构特殊,上层约20米是排水良好的石灰岩层,而在其下部是不透水的泥岩层。此地虽然年降雨量在200O—3000毫米(是东京的1.5倍),雨水随时通过石灰岩全部流入海中,在地表不能形成河流。自1988年夏季开始,该岛利用农林水产省和冲绳开发厅的国营事业费,开始用混凝土连续壁施工法在地下修建总贮水量为950万吨的“砂河地下水坝”,以后还将在该岛东侧再建造一个容量为1050万吨的福里
Miyakojima, Okinawa Prefecture, Japan has a special geological structure with a well-drained limestone layer of about 20 meters above the top and a water-impermeable mudstone layer below it. Although the annual rainfall here is 200-0-3000 mm (1.5 times that of Tokyo), rainwater can flow into the sea at any time through the limestone, and rivers can not form on the surface. Beginning in the summer of 1988, the island utilized the state-owned operating expenses of the Ministry of Agriculture, Forestry and Fisheries and the Okinawa Development Agency to start construction of a subsurface “Sand River Dam” with a total storage capacity of 9.5 million tons using the continuous concrete wall construction method, On the eastern side of the island, another 10.5 million tons of Furi was constructed