人类活动影响下岩溶地下河水-岩作用强度时空差异分析
发布时间：2018-10-19 16:42
【摘要】：为探讨人为来源的硫酸和硝酸进入地下河系统后产生的水-岩作用时空差异,以受城镇排污和工农业活动影响的广西南丹县里湖地下河流域为研究对象,分别于2014年5月、10月及2015年1月、7月对里湖地下河水化学进行监测并分析其δ~(13)CDIC组成,结果表明:1里湖地下河流域为HCO_3-Ca型,受控于碳酸盐岩的自然风化溶解和人为产生的城镇污水、工业废水和农用肥料的影响,各离子浓度在旱季大于雨季,空间上从上游到下游整体呈现波动下降的趋势;2地下水[Ca~(2+)+Mg~(2+)]/[HCO_3~ ]当量比值在1.12~1.56之间,[SO_4~(2 )+NO_3~ ]/[HCO_3~ ]比值在0.11~0.50之间,揭示硫酸、硝酸参与了水-岩作用;3根据水化学方法计算得出碳酸溶蚀碳酸盐岩的比例介于28.04%~78.55%之间,平均为50.01%,溶解能力最强为下游的小龙洞处,季节上,在2014年5月其溶蚀能力均较弱,受多种因素影响,在流域的不同区域,碳酸溶蚀的最大强度出现在不同季节;硫酸和硝酸溶蚀碳酸盐岩的比例介于21.45%~71.96%之间,平均为49.71%,在农业活动的影响下,其溶蚀能力最强出现在2014年5月,受人类活动强度和水体自净作用的综合影响,其溶蚀强度总体上表现为中游农业活动区域上游城镇和工业排污区域下游人为活动较少干扰区域;4地下水δ~(13)C_(DIC)分布在 10.74‰~ 4.34‰之间,平均为 7.36‰,由δ13CDIC估算出的碳酸溶解碳酸盐岩形成的DIC的比例在34.32%~84.96%之间,2014年5月的农耕季节所占比例较低,与水化学方法估计出的结果一致,共同指示了农业活动对碳酸溶解碳酸盐岩的干扰。空间上,在流域水体CO_2脱气和水生植物代谢过程的扰动下,两种估算结果的响应受到干扰,还应根据具体情况,将水化学划分方法和同位素混合比例方法相结合,相互检验。
[Abstract]:In order to study the space-time difference of water-rock interaction between the water and rock in the underground river system after the anthropogenic sulfuric acid and nitric acid enter the underground river system, the underground river basin of Lihu in Nandan County, Guangxi, which is affected by urban sewage discharge and industrial and agricultural activities, is taken as the research object. Chemical monitoring and analysis of 未 ~ (13) CDIC composition of Lihu underground river were carried out in May, October, and January, 2015 and July, respectively. The results show that: 1) Lihu underground river basin belongs to HCO_3-Ca type. Controlled by the natural weathering dissolution of carbonate rocks and the effects of man-made municipal sewage, industrial wastewater and agricultural fertilizers, the concentrations of ions in dry season are greater than in rainy season. (2) the ratio of [Ca~ (2) Mg~ (2)] / [HCO_3~] in groundwater is between 1.12 and 1.56, and the ratio of [SO_4~ (2) NO_3~] / [HCO_3~] is between 0.11 and 0.50. (3) according to the calculation of hydrochemical method, the ratio of carbonated carbonate rock is between 28.04% and 78.55%, with an average value of 50.01. The dissolution capacity of carbonate rock is the strongest in the lower reaches of Xiaolong Cave, and in season, the dissolution capacity of carbonate rock is weak in May 2014. Under the influence of many factors, the maximum strength of carbonate solution appeared in different seasons in different regions of the basin, and the ratio of sulphuric acid and nitric acid dissolved carbonate rock was between 21.45% and 71.96%, with an average of 49.71%, which was affected by agricultural activities. Its dissolution capacity was strongest in May 2014, and was affected by the intensity of human activities and the self-purification of water body. Generally speaking, the dissolution intensity of groundwater is less disturbed by human activities in the upper reaches of towns and industrial sewage areas in the middle reaches of agricultural activities, and (4) the distribution of 未 ~ (13) C _ (DIC) in groundwater ranges from 10.74 鈥，
本文编号：2281726
[Abstract]:In order to study the space-time difference of water-rock interaction between the water and rock in the underground river system after the anthropogenic sulfuric acid and nitric acid enter the underground river system, the underground river basin of Lihu in Nandan County, Guangxi, which is affected by urban sewage discharge and industrial and agricultural activities, is taken as the research object. Chemical monitoring and analysis of 未 ~ (13) CDIC composition of Lihu underground river were carried out in May, October, and January, 2015 and July, respectively. The results show that: 1) Lihu underground river basin belongs to HCO_3-Ca type. Controlled by the natural weathering dissolution of carbonate rocks and the effects of man-made municipal sewage, industrial wastewater and agricultural fertilizers, the concentrations of ions in dry season are greater than in rainy season. (2) the ratio of [Ca~ (2) Mg~ (2)] / [HCO_3~] in groundwater is between 1.12 and 1.56, and the ratio of [SO_4~ (2) NO_3~] / [HCO_3~] is between 0.11 and 0.50. (3) according to the calculation of hydrochemical method, the ratio of carbonated carbonate rock is between 28.04% and 78.55%, with an average value of 50.01. The dissolution capacity of carbonate rock is the strongest in the lower reaches of Xiaolong Cave, and in season, the dissolution capacity of carbonate rock is weak in May 2014. Under the influence of many factors, the maximum strength of carbonate solution appeared in different seasons in different regions of the basin, and the ratio of sulphuric acid and nitric acid dissolved carbonate rock was between 21.45% and 71.96%, with an average of 49.71%, which was affected by agricultural activities. Its dissolution capacity was strongest in May 2014, and was affected by the intensity of human activities and the self-purification of water body. Generally speaking, the dissolution intensity of groundwater is less disturbed by human activities in the upper reaches of towns and industrial sewage areas in the middle reaches of agricultural activities, and (4) the distribution of 未 ~ (13) C _ (DIC) in groundwater ranges from 10.74 鈥，
本文编号：2281726
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