Chemical Water Quality in the Groundwater in the Ooyanojima Island and its Surrounding Islands, Kumamoto Prefecture

H. Ueki, Y. Otawara
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Abstract

The purpose of this survey is to determine the chemical quality of the groundwaters in the Ooyanojima Island and its surrounding islands (Iwajima, Tobasejima, Yushima, and Nokamajima Island). These islands, a small island on the Ariake Sea and Yatsushiro Sea, is situated about fifty kilometers south west of Kumamoto City, Kumamoto Prefecture. In this article, 46 groundwater samples (38 shallow well waters and other samples) in this area were collected in September 1977 (partly during 1979 to 1983) and analyzed for the pH value, potassium permanganate consumed, total residue, major components and some ions dissolved in them. Based on the analytical results of many dissolved components, it was shown that the concentrations of the major components were widely varied in each well (table 1) . There were considerably a large amount of contents of Na+, Ca2+, HCO3—, Cl—, SO42—,and soluble silicate in the groundwaters in this area. The relations of the concentration of cations and anions in the groundwaters were Na+ )Ca2+ )Mg2+ )K+ and HCO3 )C1— )SO42—, respectively. By use of the key diagram method, the chemical composition of the groundwaters in this area was mainly devided into two different composition in each (fig. 2), namely noncarbonate hardness type (Ca—Cl•SO4 type) and carbonate hardness type (Ca—HCO3 type). The concentrations of chemical components dissolved in the shallow well waters were generally larger than that of dissolved in the deep well waters, except for total iron and soluble silicate. The concentrations of nitrate nitrogen in the shallow well waters in this area were found to be in the range of 0.2 — 39.1mg/1. Their arithmetic mean value (7.0mg/1) was markedly high and became about 10 times larger than that in the deep well waters, however, the source of that was not made to elucidate for this investigation. The concentration of soluble silicate in the groundwaters collected from the Cretaceos period
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熊本县卵之岛及其周边岛屿地下水化学水质研究
本次调查的目的是确定Ooyanojima岛及其周围岛屿(岩岛、富basejima岛、羽岛和野岛)地下水的化学质量。这些岛屿位于熊本县熊本市西南约50公里处,是有明海和八津海上的一个小岛。本文于1977年9月(部分时间为1979 ~ 1983年)采集了该地区46个地下水样品(38个浅层井水及其他样品),对其pH值、高锰酸钾消耗量、总残留量、主要组分及部分溶出离子进行了分析。根据许多溶解成分的分析结果,表明每口井中主要成分的浓度变化很大(表1)。该地区地下水中Na+、Ca2+、HCO3 -、Cl -、SO42 -和可溶性硅酸盐含量相当高。地下水中正阴离子浓度的关系分别为Na+)Ca2+)Mg2+)K+和HCO3)C1 -)SO42 -。利用关键图法,将该区地下水化学组成主要分为两种不同的组成(图2),即非碳酸盐硬度型(Ca-Cl•SO4型)和碳酸盐硬度型(Ca-HCO3型)。除总铁和可溶性硅酸盐外,浅井水中溶解的化学成分浓度普遍大于深井水。该地区浅层井水硝态氮浓度在0.2 ~ 39.1mg/1之间。它们的算术平均值(7.0mg/1)明显高,比深井水的平均值大了大约10倍,但其来源并未在本调查中说明。白垩纪收集的地下水中可溶性硅酸盐的浓度
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岩盤地下水の水質・同位体組成調査*(1) 特性曲線型有限要素法を用いた密度差のある地下水流動の数値解析-淡水・塩水2相流への応用 非定常地下水変動場における透水(量)係数の推定 A‘Characteristie’Finite Element Method for Dispersion-Convection Equation. The Fluctuation in Groundwater Level prior and after the Miyagi Oki Earthquakes.
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