| 重庆典型岩溶地下水系统水文地球化学特征研究 |
| 摘要点击 3934 全文点击 1879 投稿时间：2013-08-21 修订日期：2013-10-22 |
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| 中文关键词 岩溶 地下水系统 水文地球化学 δ18O δD 青木关 |
| 英文关键词 karst groundwater system hydrogeochemistry δ18O δD Qingmuguan |
| 作者 | 单位 | E-mail | | 杨平恒 | 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,重庆 400715
国土资源部岩溶动力学重点实验室,桂林 541004
国土资源部岩溶生态环境-重庆南川野外基地,重庆 408435 | balacne@swu.edu.cn | | 卢丙清 | 重庆市地质勘查开发局南江水文地质工程地质队,重庆 401121 | | | 贺秋芳 | 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,重庆 400715
国土资源部岩溶生态环境-重庆南川野外基地,重庆 408435 | | | 陈雪彬 | 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,重庆 400715
国土资源部岩溶生态环境-重庆南川野外基地,重庆 408435 | |
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| 中文摘要 |
| 以重庆青木关岩溶地下水系统为例，分析了地下水系统入口地表水和出口地下水两年的水文过程、物理化学及部分δD、δ18O数据，目的是掌握地下河系统地球化学在时间及空间上的特征及变化规律.结果表明，研究区地下水系统流量受降雨的影响存在丰水期和枯水期，地下水中化学组分在岩溶含水层运移的过程中受水岩作用、人类活动和雨水稀释作用的共同影响，并表现出较为明显的时间和空间规律性.地下河系统入口的地表水δD、δ18O值分布于重庆大气降水线的下方，地表水蒸发作用强烈，且旱季δD、δ18O值重于雨季，存在明显的季节效应；出口地下水的δ18O、δD值较入口偏负，且相对稳定，认为雨水主要是以通过落水洞直接灌入和通过岩溶非饱和带扩散流等两种形式转换为地下水. |
| 英文摘要 |
| The two-year hydrologic process, hydrochemistry, and a portion of δD, δ18O of both the surface water at the inlet and the groundwater at the outlet, were investigated to identify the spatial and temporal variations of hydrogeochemistry in the Qingmuguan karst groundwater system. Research results show that there are wet and dry periods in the groundwater system owing to the striking influence of seasonal rainfall. The evolution of the chemical compositions in the groundwater is significantly influenced by the water and rock interaction, anthropogenic activities and rainwater dilution. The variations of the chemical compositions in the groundwater exhibit obvious spatiality and temporality. The δD and δ18O of the surface water beneath the local Meteoric Water Line of Chonqing indicate that the surface water is strongly evaporated. Furthermore, the δD and δ18O of the surface water are more positive in the dry period than in the wet period, showing a distinct seasonal effect. The δD and δ18O of the groundwater are quite stable and much negative compared with those of the surface water, which suggests that the rainwater recharge the groundwater via two pathways, one directly through sinkholes and the other via the vadose zone. |
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