Study on multi-recharge areas and groundwater flow paths in closed groundwater system around urban area

城市周边封闭地下水系统多重补给区及地下水流路研究

• 批准号: 14550542
• 负责人: NAKAYA Shinji
• 金额: $ 2.3万
• 依托单位: Shinshu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550542/
• 关键词: groundwater; recharge zone; stable isotopic ratios; flow path; flow barrier; 自然トレーサー; 単純混合; インバージョン; 環境同位体; 涵養源; 水質; 断層; 同位体; 地球統計学; 硝酸性窒素

Most basins, which is located in a high or low land surrounded by mountains, depends considerably on groundwater for domestic, agricultural, industrial and urban uses. An understanding of recharge zone and the flow path of the groundwater provides important strategy into the resource management and prevention of groundwater contamination.We investigated stable isotope of oxygen and hydrogen and water quality of groundwater in order to identify the recharge zones and flow paths in the Matsumoto Basin and Osaka basin. In the Matsumoto Basin, all stable isotope data fell on a meteoric line widely. The spatial distributions of the oxygen and hydrogen stable isotopic ratios, water quality and altitude effect against oxygen stable isotope of groundwater indicate that flow systems of shallow groundwater and deep groundwater, five recharge zones and seven flow paths are distinguishable in the study region. The four flow paths of shallow and deep groundwater system are along river flows. The tw … More o flow paths through each of two inferred faults, which are covered by the alluvial thin layer, are estimated by lower δ ^<18>O and δ D values. A flow path through an inferred fault into the deeper aquifer is estimated by the comparison of water compositions and the stable isotope data of the deep groundwater with those of the shallow groundwater. The NO^-_3-N from three contamination sources partially exceeded the WHO standard migrates and spreads toward the urban area along the flow paths in both the shallow and deep groundwater system. After monitoring NO^-_3-N for three years, it became apparent that NO^-_3-N of groundwater maintains a constant concentration in a shallow groundwater system, while it increases in a deep groundwater system. A flow path works as a flow barrier and causes the basin to be a closed groundwater flow system. In the Osaka basin, most stable isotope data fell on a meteoric line widely, while some data fell on the line with more gentle slope than a meteoric line and larger δ ^<18>O than -7.1 ‰. The altitude effect against oxygen stable isotope of groundwater indicate that groundwaters in recharge zone have smaller δ ^<18>O than -7.1 ‰. The shallow and deep groundwaters with these anomalously high δ ^<18>O spatially distribute at many points in the basin, which are coincident with the large pumping wells. The spatial distributions of the oxygen and hydrogen stable isotopic ratios, Cl^-and altitude effect against oxygen stable isotope of groundwater suggest that groundwaters are formed by mixing meteoric water from recharge area with sea water and Uemach terrace works as a flow barrier and causes the eastern part of the basin to be a closed groundwater flow system. Less

大多数盆地位于群山环绕的高地或低地，在很大程度上依赖地下水用于家庭、农业、工业和城市用途。了解地下水补给带和流动路径，为地下水污染的资源管理和防治提供了重要的策略。为了识别松本盆地和大阪盆地的补给带和流动路径，对地下水中氧、氢稳定同位素和地下水水质进行了调查。在松本盆地，所有稳定的同位素数据广泛地落在一条流星线上。氧、氢稳定同位素比值、水质和海拔高度对地下水氧稳定同位素的空间分布特征表明，研究区存在浅层地下水和深层地下水的流动系统、5个补给带和7条流动路径。浅层地下水和深层地下水系统的四条流动路径都是沿河流动的。TW…通过较低的δ^&lt；18&gt；O和δD值估计出更多的流经两个被冲积薄层覆盖的推断断层的路径。通过对深层地下水和浅层地下水的水成分和稳定同位素数据的比较，估计了通过推断的断层进入深层含水层的流动路径。来自三个污染源的NO-3-N部分超标，在浅层地下水和深层地下水系统中均沿流动路径向市区迁移扩散。经过3年的监测，发现浅层地下水系统中地下水中的NO-3-N浓度保持不变，而深层地下水系统中的NO-3-N浓度有所增加。流动路径起到了流动屏障的作用，使盆地成为一个封闭的地下水流动系统。在大阪盆地，大多数稳定的同位素数据落在降雨线上，有些数据落在降雨线上，倾斜度比降雨线平缓，δ^&lt；18；O大于-7.1‰。海拔高度对地下水氧稳定同位素的影响表明，补给带地下水的δ小于-7.1‰。δ异常高的浅层和深部地下水在空间上分布于盆地内的多个点，与大型抽油井相吻合。氧、氢稳定同位素比值、氯离子和海拔高度对地下水氧稳定同位素的空间分布表明，地下水是补给区大气降水与海水混合形成的，乌马赫阶地起到了水流屏障的作用，使盆地东部成为一个封闭的地下水流动系统。较少

项目成果

Nakaya, S., T.Yoshida, N.Shioiri: "Percolation conditions in binary fractal fracture networks : applications to rock fractures, and active and seismogenic faults"J. Geophysical Research-Solid Earth. (印刷中). (2003)

Nakaya, S., T.Yoshida, N.Shioiri：“二元分形裂缝网络中的渗流条件：在岩石裂缝、活动断层和地震断层中的应用”J. 地球物理研究 - 固体地球（2003 年出版）。

酸素および水素同位体比と水質から見た長野県松本盆地中・南部地域の広域地下水流動系

从氧、氢同位素比和水质看长野县松本盆地中南部地区广域地下水流系统

• 发表时间: 2003
• 期刊: 日本地下水学会誌 45(2)
• 作者: 小宮洋行;中屋眞司;益田晴恵;日下部実
• 通讯作者: 日下部実

Determination of anisotropy of spatial correlation structure in a three-dimensional permeability field accompanied by shallow faults

浅层断层三维渗透率场空间关联结构各向异性测定

• 发表时间: 2002
• 期刊: Water Resour.Res. 38(8)
• 作者: Nakaya S.;T.Yohmei;A.Koike;T.Hirayama;T.Yoden;M.Nishigaki
• 通讯作者: M.Nishigaki

Nakaya S., T.Yohmei, A.Koike, T.Hirayama, T.Yoden, M.Nishigaki: "Spatial correlation structure in the three-dimensional permeability field accompanied by shallow faults"Proceedings of the International Groundwater Symposium /LBNL, Berkeley, California/USA

Nakaya S.、T.Yohmei、A.Koike、T.Hirayama、T.Yoden、M.Nishigaki：“伴随浅层断层的三维渗透率场中的空间相关结构”国际地下水研讨会论文集/LBNL，伯克利

地下水溶存成分から推定される大阪平野浅層地下水の涵養経路

根据地下水溶解成分估算大阪平原浅层地下水补给路径

• 发表时间: 2004
• 期刊: 地下水地盤環境に関するシンポジウム2004発表論文集
• 作者: Zaika;Y.;Y.Honjo;中屋眞司
• 通讯作者: 中屋眞司