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.

研究了化学成分，氢和氧同位素，以分析奇诺川附近的小森林盆地中的起源和迁移行为，地下水和地表水。在大阪和瓦卡亚马城市都采样了雨水，并进行了分析。河水化学取决于雨季土壤水的径流，但是它在地下水的径流（不包括雨时期）上确实如此。与河水，溪流水和地下水相比，雨水的离子浓度较低。流水化学与河水化学几乎相同。但是，由于沉积岩和土壤的风化和化学反应，地下水化学与河水化学不同。可以澄清说，稳定的同位素比或河水取决于地下水的径流，而地下水的同位素比取决于盆地山脉的高度，以及雨水和河水之间的同位素比的差异表明表面径流是否存在还是存在不是。 Cl^ - 在Wakayama采样的降水中，大阪和Tondabayashi城市主要来自海洋。硝酸盐和硫酸盐的浓度源自大阪和Tondabayashi城市的城市活动，高于Wakayama City的硝酸盐和硫酸盐。大阪和Tondabayashi城市的平均pH值为5.2，低于Wakayama City的5.8。降水中的氧气和氢同位素比随时间变化。尽管有广泛的变化，但氧气和氢同位素比的时间序列在从Wakayama到大阪县的广泛区域中显示出几乎相同的值。因此，降水中的氧气和氢同位素比被认为取决于空气中的变化或氧和氢同位素比。