暴雨条件下岩溶槽谷区地下河水化学特征变化分析——以重庆青木关姜家泉为例  

Analysis of Diurnal Variation in Chemical Properties of Underground River Water in a Typical Karst Trough Valley Area Under Heavy Rain Scale——A Case Study Jiangjia Spring at Qingmuguan of Chongqing

作　　者：吴金权[1] 蒋勇军[1,2] 郑洁[1] 廖文娥[1] 罗建[1] 葸瑞[1] 

机构地区：[1]西南大学地理科学学院,重庆400715 [2]西南大学岩溶环境与石漠化治理研究所,重庆400715

出　　处：《西南大学学报（自然科学版）》2013年第10期146-152,共7页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41172331;41040026);中央高校基本科研业务费资助项目(XDJK2011B3003);国土资源部地质调查资助项目(1212011087119);国土资源部公益性行业科研专项资助项目(201111022);国土资源部岩溶动力学重点实验室开放课题资助项目(KDL2011-01);西南大学博士基金资助项目(SWU109050)

摘　　要：为研究岩溶地下河水化学指标在昼夜变化期间对暴雨响应的敏感性,以Multi3430便携式仪器和CDTP300作为基础监测,在暴雨条件、短时间尺度和高精度条件下,对重庆青木关姜家泉物理化学性质对暴雨及昼夜变化的响应进行监测研究,结果表明:地下河化学指标对环境变化反应敏感.暴雨期间,大量的Ca2+,HCO3-,NO3-等离子随雨水汇入地下河引起水质在短时间内变化较为明显,暴雨在一定程度上加速了碳酸盐岩的溶蚀,且K+,Na+,Ba2+等阳离子质量浓度也受到流量的影响;在暴雨结束数小时之后,表层岩溶带的高裂隙率和渗透性发挥作用,水动力作用和CO2效应逐渐占主导地位.Ca2+,HCO3-等离子质量浓度昼夜尺度变化总体表现为昼大于夜.The diurnal variation in physical and chemical properties of the underground water of Jiangjia Spring at Qingmuguan of Chongqing under heavy rain was monitored to study their response to rainfall. The results showed that the chemical indicators of the underground river were quite sensitive to environ- mental change. During the heavy rain, a lot of Ca^2＋ , HCO3^- and NO3^- plasma entered the underground river together with the rainwater and induced obvious change in water quality in a short time. The heavy rain accelerated, to a certain extent, carbonate erosion, and the concentrations of K^＋ , Na^＋ , Ba^2＋ were al so affected by the flow. A few hours after the end of the storm, the high fracture rate and permeability of the epikarst zone began to show their influences, and dynamic effects of water and CO2 effects gradually became dominant. As for the diurnal variations, the plasma concentrations of Ca^2＋ and HCO3^- were generally higher during the day than at night.

关 键 词：短时间尺度 岩溶作用 环境敏感性 化学特征 

分 类 号：P641.3[天文地球—地质矿产勘探] P641.134[天文地球—地质学]