雪玉洞岩溶地下水、地表水Ca2+、Mg2+、Sr2+变化特征研究

王晓晓; 徐尚全; 沈立成

雪玉洞岩溶地下水、地表水Ca2+、Mg2+、Sr2+变化特征研究

西南大学地理科学学院/三峡库区生态环境教育部重点实验室

基金项目: 国家自然科学基金(41072192、41103068),重庆市科委院士专项(CSTC.2010BC7004),重庆市国土与房管局科技项目

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出版历程
- 收稿日期: 2012-11-28
- 刊出日期: 2013-03-25

Variations of Ca2+、Mg2+、Sr2+ in groundwater and surface water from the Xueyu cave

ey Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Geographical Sciences, Southwest University

摘要

摘要: 通过2011年对重庆丰都雪玉洞洞内滴水和地下河河水,上覆岩层中出露的表层岩溶泉水和雪玉洞附近龙河河水等不同类型水中Ca2+、Mg2+、Sr2+浓度及Mg/Ca、Sr/Ca值的研究,发现不同水的Ca2+、Mg2+、Sr2+随外界降水条件的改变而出现明显变化。表层岩溶泉水Ca2+变化能够敏感反应外界降水条件改变,滴水对外界降雨的反应滞后接近1个月,地下河Ca2+可以反应雨季和旱季的变化,地表河水Ca2+全年比较稳定,但是对特殊干旱天气有显著响应。2011年不同类型水的Mg2+、Sr2+全年变化趋势基本一致,在降水较多的3、5、10月呈低值,在其他降水较少的月份浓度相对较高。各离子的这种变化特征主要是受到稀释效应、CO2效应以及所在地层的岩性的影响。雪玉洞不同类型水的Mg/Ca、Sr/Ca值呈现出滴水>地表河>地下河>表层岩溶泉的特点,反映出不同类型水在含水介质中滞留时间的长短,并且Mg/Ca、Sr/Ca值在降水较多的月份降低,在降水较少的月份升高;受碳酸钙的前期沉淀和运移路径差异的影响,不同类型水的Mg/Ca、Sr/Ca值变化稍有不同。因此,不同类型水的离子变化及其比值对外界降水条件变化的响应特征和时间的不同,决定了在利用元素及其比值反映外界环境变化时也要区别对待。
- 岩溶地下水 /
- 地表水 /
- 水化学 /
- 环境变化 /
- 重庆雪玉洞
Abstract: A one year study of water geochemistry was performed in the Xueyu cave in 2011, the concentrations of Ca2+、Mg2+、Sr2+ and elemental ratios of Mg/Ca、Sr/Ca in drip water, groundwater and epikarst spring water from the overlaying bedrock as well as the surface water from the Long River were measured. The results indicate the variation of Ca2+、Mg2+、Sr2+ along with the precipitation was notable. The Ca2+ in epikarst spring water can response with the change of precipitation sensitively. The drop water responses to the change of precipitation may last for a month. The rainy season and the dry season can be reflected by the underground water. The content of Ca2+in the surface water was stable all year round but had pronounced reflection to extreme dry weather. The variations of Mg2+ and Sr2+ in different types of water were consistent with each other yearly in 2011, and the concentrations of Mg2+ and Sr2+ were lower in March, May and October with much rainfall, but higher in other months with little rainfall. The above changes in cation concentrations were related to the dilution effect, CO2 effect and lithology. The ratios of Mg/Ca and Sr/Ca in different kinds of waters from the Xueyu cave system ranged from high to low as follows: drip water, surface water, ground water and spring water, reflecting different detention time in the aquifer media and reacting time with bedrock. The ratios of Mg/Ca and Sr/Ca were low during wet period and high during dry period. For the impact of the former calcium carbonate precipitation and the variance in transport routes, there are slight differences in the ratios of Mg/Ca、Sr/Ca. Therefore, the change of ions concentration and their ratios in different types of water is different in the responding time and features to external precipitation, which deciding that it should make difference when determining external environmental changes with the elements and their ratios.
- karst groundwater /
- surface water /
- hydrochenmistry /
- environment change /
- the Xueyu cave

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