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Study of groundwater flow system in mountainous bedrock aquifer and their evaluation as undeveloped water resources

山地基岩含水层地下水流系统研究及未开发水资源评价

基本信息

批准号：
14208064
负责人：
SHIMADA Jun
金额：
$ 38.36万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2005
项目状态：
已结题

项目摘要

Quaternary pyroclastic flow deposits are widely distributed in Japan, but their groundwater flow system has not been much studied. Relatively steep morphologic surface with humid temperate hydrological condition of our country should create active groundwater flow including coastal groundwater seepage-out. A 4.5 km^2 mountainous pyroclastic catchment has been selected in Uto peninsula, Kumamoto, Japan for this purpose and following four major themes has been taken to reveal the regional groundwater flow system :1.Precise hydrometric study in the head water catchment,2.isotope hydrological study with the help of groundwater potential measurement using deep observation boreholes,3.Self potential and resistivity survey, seepage meter measurement in the on- and off-shore area,4.Three dimensional groundwater flow simulationThe study was done from 2002 and 2005 with major hydrological observation system including 4 river discharge measurement and 8 different depths boreholes in the study catchment. The 3 dimensional groundwater flow system in the pyroclastic flow body has been cleared with the help of groundwater potential monitoring, SP measurement, environmental isotope study, and the simulation modeling. The SGD at the coastal area has shown the clear difference depend on the regional groundwater discharge estimated from water dudget calculation. Hydrometric observation at the headwater chatchment has shown the clear contribution of bedrock groundwater which also works as the recharge of the main groundwater body of the studied mountainous aquifer.

第四纪火山碎屑流沉积在日本分布广泛，但对其地下水流动系统研究较少。我国具有湿润温带水文条件的相对陡峭的地形面，应该会产生活跃的地下水流动，包括沿海地下水渗漏。为此，在日本熊本市宇藤半岛选取了一个面积为4.5 km2的山地火山碎屑集水区，从以下四个方面揭示了区域地下水流动系统：1.源头流域的精确水文研究；2.利用深井地下水势测量进行同位素水文研究；3.自然电位和电阻率测量；4.岸上和近海地区的渗流计测量；4.三维地下水流动模拟研究。通过地下水潜势监测、SP测量、环境同位素研究和模拟模拟，明确了火山碎屑流体内的三维地下水流系统。沿海地区的SGD显示出明显的差异，这取决于根据用水量计算得到的区域地下水流量。水源地水文观测表明，基岩地下水具有明显的补给作用，对所研究的山地含水层的主要地下水体具有补给作用。