表层岩溶地下水出露地表后的脱气作用——以重庆市南川区柏树湾表层岩溶泉溪流为例

周小萍; 沈立成; 王鹏; 徐尚全; 林明珠

doi:10.3969/j.issn.1001-4810.2011.04.013

表层岩溶地下水出露地表后的脱气作用——以重庆市南川区柏树湾表层岩溶泉溪流为例

doi: 10.3969/j.issn.1001-4810.2011.04.013

1.
西南大学地理科学学院
2.
西南大学地理科学学院；西南大学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(编号:41072192)、重庆市科委院士基金(编号:CSTC,2010BC7004)

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出版历程
- 收稿日期: 2011-10-17
- 发布日期: 2011-12-25

Degasification of the outcropped epikarst water：A case study on the Baishuwan Spring in Nanchuan，Chongqing

1.
School of Geographical Sciences, Southwest University
2.
School of Geographical Sciences, Southwest University；Key Laboratory of the Three Gorge’s Eco-Environment, Ministry of Education, Southwest University

摘要

摘要: 以重庆市南川区柏树湾表层岩溶泉溪流为例,沿柏枝溪流程以一定间距监测水体中HCO3-的浓度及其pH、电导率、溶解氧等水化学参数,并初步探究溪流水的脱气效应。结果显示(1)表层岩溶地下水出露地表后,HCO3-浓度沿流程呈现出递减的规律;(2)HCO3-浓度递减的快慢反映了脱气作用的强弱,溪流脱气速率具有“枯水期>平水期>丰水期”的特点;(3)暴雨期间由于稀释效应HCO3-浓度递减趋势不明显,但降雨后期,递减又开始逐渐产生;(4)脱气效应在造成溪流水HCO3-浓度减小的同时,也导致电导率(EC)沿柏枝溪流程逐渐降低,而pH值逐渐升高;(5)沿途溶解氧(DO)昼夜变化表明,水生生物作用对脱气作用可能也有一定的影响,但其影响机制还有待进一步的研究。
- 表层岩溶泉 /
- HCO3-含量 /
- 脱气作用
Abstract: HCO3- Concentration, pH, conductivity (EC) and dissolved oxygen are monitored with certain space along the downstream of the Baishuwan Spring—the Baizhi Stream, and a preliminary study on the degasification of the karst water is conducted in the case study. The results show that (1)there is a decreasing trend in HCO3- concentration along the flow path; (2) the decreasing speed of HCO3- concentration reflects the speed of degasification and the degassing speed in different season assumes “drought period ＞ normal period ＞ rainy period”; (3) dilution effect of the rain water makes the decreasing trend unobvious, but after the rainfall, it starts to present a decreasing trend again; (4) degasification also causes the conductivity (EC) decline along the flow path, but pH values increase; (5) diurnal variation in dissolved oxygen (DO) along the flow path shows that the aquatic organism may have some influences on the degasification, but the influencing mechanism still needs further study.
- epikarst spring /
- HCO3- concentration /
- degasification

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