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Clarify of origin and migration of substances in subsurface environment using stable isotope

使用稳定同位素澄清地下环境中物质的来源和迁移

基本信息

批准号：
10650506
负责人：
HIRATA Tatemasa
金额：
$ 2.24万
依托单位：
Wakayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

Chemical composition, hydrogen and oxygen isotopes were studied for analyzing the origin and migration behavior or groundwater and surface water in the small forested basin near the Kinokawa. Also rain water was sampled at both Osaka and Wakayama cities and was analyzed. River water chemistry depended on the runoff of soil water in rainy period, however it did on the runoff of groundwater excluding the rainy period. Ionic concentrations of rain water were low as compared with those of river water, stream water and groundwater. Stream water chemistry was almost the same as river water chemistry. Groundwater chemistry, however, was different from river water chemistry due to the weathering and chemical reaction of the sedimentary rocks and soils. It was clarified that stable isotopic ratios or river waters depended on the runoff of groundwater of which isotopic ratios were determined by the height of mountains in the basins, and the differences of the isotopic ratios between rainwater and river water showed whether the surface runoff exists or not. Cl^- in precipitation sampled at Wakayama, Osaka and Tondabayashi cities were mainly derived from sea. Concentrations of nitrate and sulfate derived from productions accompanied with city activities in Osaka and Tondabayashi cities were higher than those in Wakayama city. The average pH values, 5.2 in Osaka and Tondabayashi cities were lower than 5.8 in Wakayama city. Oxygen and hydrogen isotopic ratios in precipitation were very variable with times. In spite of the variation widely, time series of Oxygen and hydrogen isotopic ratios showed almost the same values in the wide areas from Wakayama to Osaka prefecture. Therefore, Oxygen and hydrogen isotopic ratios in precipitation were thought to depend on the change or Oxygen and hydrogen isotopic ratios in air.

通过化学成分、氢、氧同位素的研究，分析了金川附近小型森林盆地地下水和地表水的成因和迁移行为。此外，还在大阪和和歌山市采集了雨水样本，并进行了分析。河流水化学主要依赖于雨季土壤水的径流，而不依赖于除雨季外的地下水径流。雨水的离子浓度低于河水、溪水和地下水的离子浓度。溪水化学与河水化学基本相同。然而，由于沉积岩和土壤的风化和化学反应，地下水化学不同于河流水化学。阐明了稳定的同位素比或河流水依赖于地下水径流，而地下水的同位素比由盆地中的山脉高度决定，而雨水和河水的同位素比的差异反映了地表径流的存在。和歌山市、大阪市和同大林市的降水中的氯离子主要来源于海洋。与城市活动相关的硝酸盐和硫酸盐在大阪和元大林市的浓度高于和歌山市。大阪和元大林市的平均pH值为5.2，低于和歌山市的5.8。降水中氧、氢同位素比值随时间变化很大。尽管变化很大，但从和歌山到大阪府的大范围内，氧和氢同位素比值的时间序列显示出几乎相同的值。因此，降水中的氧、氢同位素比被认为取决于空气中氧、氢同位素比的变化。