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| 西南喀斯特流域枯季地下水电导率特征及水-岩作用分析 |
| Characteristics of Groundwater Conductivity in Dry Season and Water-rock Interaction Implications in a Southwest Karst Basin |
| 投稿时间：2018-11-08 修订日期：2019-01-16 |
| DOI：10.14050/j.cnki.1672-9250.2019.47.055 |
| 中文关键词: 喀斯特流域;电导率;水动力条件;岩性;枯季 |
| 英文关键词: Karst basin;specific electrical conductivity;hydrodynamic condition;rock;dry season |
| 基金项目:国家自然科学基金国际合作重大项目（41571130071）；国家自然科学基金项目（41571020）；国家重点研发项目（2016YFC0502602）；国家重点基础研究发展计划（973计划）项目（2015CB452701）。 |
| 作者 | 单位 | | 朱彪1, 陈喜1,2, 张志才1, 彭韬3, 张乐辰4, 陈波3, 赵美刚3 | 1. 河海大学 水文水资源与水利工程科学国家重点实验室, 南京 210098
2. 天津大学 表层地球系统科学研究院, 天津 300072
3. 中国科学院普定喀斯特生态系统观测研究站 中国生态系统研究网络, 贵州 普定 562100
4. 华电电力科学研究院有限公司, 杭州 310030 |
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| 中文摘要: |
| 受特殊水文地质条件影响，西南喀斯特流域水动力过程与物质循环过程复杂，利用单一水文信息分析该地区水动力过程具有较大难度。地下水电导率受喀斯特水文地质条件影响显著，可以综合反映区域水动力条件与岩性特征。论文选取贵州普定县后寨河流域为研究区，通过野外调查及地下水电导率原位测定，结合流域地形、岩性及落水洞、岩溶泉等岩溶地貌空间分布规律，分析了喀斯特流域枯季地下水电导率空间分布及其受水-岩特征的影响。结果表明，山丘区地下水电导率较低，主要由于喀斯特山区是岩溶裂隙/管道网络发育的强径流区，水-岩接触时间较短。随高程降低，地下水电导率呈现增加趋势，表明地下水流速度减缓，水-岩接触时间变长。地下水电导率受岩性特征影响显著，石灰岩区水-岩作用强烈，易形成较高电导率地下水，平均电导率650 μS/cm，白云岩区水-岩作用减弱，地下水电导率降低，平均值523 μS/cm。 |
| 英文摘要: |
| The hydrodynamic and the material circulation processes in southwestern karst basins are very complex because of the special hydrogeological conditions. It is difficult to analyze the hydrodynamic process in these regions by using a single piece of hydrological information. Groundwater conductivity is affected by karst hydrogeological conditions, which comprehensively reflects regional hydrodynamic conditions and lithological characteristics. In this paper, the Houzhai River Basin in Puding County, Guizhou Province, is selected as the research area. Through field investigation and in-situ measurement of groundwater conductivity, combined with spatial distribution laws of karst topography, lithology, falling water caves and karst springs, the spatial distribution of groundwater conductivity and its influence by water-rock characteristics in the karst basin in dry season are analyzed. The results show that the groundwater conductivity in the hilly area, a strong runoff area with karst fissure/pipeline network development, is low because, mainly, the water-rock contact time is short. The conductivity of groundwater shows an increasing trend with the decrease of elevation, which indicates that the velocity of groundwater flow slows down and the water-rock contact time becomes longer. Groundwater conductivity is significantly affected by lithological characteristics. The water-rock interaction is strong in limestone areas, and it is easy to form groundwater with a high average conductivity of 650 μS/cm. The water-rock interaction is weakened in dolomite areas and the average groundwater conductivity is reduced to 523μS/cm. |
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