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Quantitative evaluation for the effect of bed-rock groundwater flow to the regional hydrological cycle.

基岩地下水流对区域水文循环影响的定量评价

基本信息

批准号：
05402017
负责人：
SHIMADA Jun
金额：
$ 22.02万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

项目摘要

The study on the bedrock groundwater flow is limited in Japan because of its less yield capacity as a groundwater resources. However, recently the study for these bedrock groundwater has become important because of the construction of the deep underground civil structure. It cab be thought that the relatively high driving force of the bedrock gorundwater be exist in the mountanious and humid country as Japan.Alluvial fan which exists between mountain range and flat plain is a turning point of the ground surface inclination. These place must have the strong upward groundwater flow in the bedrock. Depend on this idea, the present study has selected the Imaichi alluvial fan, Tochigi prefecture of Japan to study the groundwater flow both in the alluvial gravel aquifer and in the bedrock fracture aquifer and also to make clear the interrelation between them within the framework of the regional ground water flow.The used methods are the conventional groundwater investigation for the gravel aquifer, river water discharge analysis, paleo-hydrological investigation for the gravel aquifer, three dimensional steady state groundwater simulation of the regional scale, two boreholes with 200 m depths to leach bedrock aquifer penetrate gravel zone, groundwater potential measurement by using these boreholes, groundwater sampling from different depth of the bedrock aquifer by using boreholes and water chemistry analysis and environmental isotope analyzes (tritium, C-14, He-3, D and 0-18), groundwater temperature profile measurement. The investigation has been done for more than two years on the different seasons. The results of these measurements makes clear the regional groundwater flow of the study area including bedrock groundwater.

由于基岩地下水作为地下水资源的开采量较小，因此日本对基岩地下水流的研究十分有限。然而，近年来，由于深部地下土建结构的建设，对这些基岩地下水的研究变得越来越重要。可以认为，基岩峡谷水的驱动力较高，可能存在于日本那样的山地湿润地区，位于山脉与平坦平原之间的冲积扇是地表倾斜的转折点。这些地方的基岩中一定有强烈的向上流动的地下水。基于这一思路，本研究选择了日本户木县Imaichi冲积扇，研究了冲积砾石含水层和基岩裂隙含水层中的地下水流动，并在区域地下水流动的框架内弄清了两者之间的相互关系。所使用的方法有砾石含水层的常规地下水调查、河流径流分析、砾石含水层的古水文调查、区域尺度的三维稳态地下水模拟、两个200 m深的钻孔渗漏基岩含水层渗透砾石带、利用这些钻孔测量地下水潜势、利用钻孔和水化学分析以及环境同位素分析(氚、C-14、He-3、D和0-18)对基岩含水层不同深度的地下水进行采样，测量地下水温度剖面。这项调查已经进行了两年多，针对不同的季节。这些测量结果明确了研究区的区域地下水流动，包括基岩地下水。