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一、地下水利用概况日本为岛国,总面积为370000km~2。年降雨量为1788mm。河川分布广、径流量大。降雨与地表径流是地下水的主要补给来源。地下水大多数分布在沿海28个河流冲积平原和7个山间盆地。地下水赋存面积为93000km~2,约占总面积的25%。部分地区的地下水储存量为:关东平原5000×10~8m~3、浓尾平原4000×18~8m~3、大阪平原2800×10~8m~3。日本于1900年就开始应用凿井技术开采地下水。在经济高速发展时期,水井迅速增
First, the overview of groundwater utilization Japan as the island nation, with a total area of 370000km ~ 2. The annual rainfall is 1788mm. Widely distributed rivers, large runoff. Rainfall and surface runoff are the main sources of groundwater recharge. Most of the groundwater is distributed in 28 river alluvial plain and 7 mountain basins along the coast. Groundwater storage area of 93000km ~ 2, accounting for about 25% of the total area. The groundwater storage in some areas is 5000 × 10 ~ 8m ~ 3 in the Kanto Plain, 4000 × 18 ~ 8m ~ 3 in the thick tail, and 2800 × 10 ~ 8m ~ 3 in the Plain of Osaka. Japan started to apply sinking technology to groundwater in 1900. During the period of rapid economic development, the wells increased rapidly