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通过对降雨条件下重庆雪玉洞地下河水文地球化学指标的监测,发现各种指标对降雨响应迅速,且存在相关性.采用主成分分析对各指标数据进行处理,提取能代表82.761%信息量的3个主成分,来分析降雨条件下岩溶地下河水文地球化学的特征及其成因.结果表明,以全Fe、全Mn、Al3+等浓度升高为代表的土壤淋失和以K+、Na+、Sr2+浓度降低、EC下降为代表的稀释效应,对水文地球化学特征变化的贡献率为41.718%,降雨加剧了岩溶区土壤的侵蚀,同时危及饮用水的安全,应引起相关部门的足够重视;岩溶水对白云岩的溶解和补给区农业活动、洞穴生物对水文地球化学特征变化的贡献率为29.958%;以Ca2+浓度升高为代表的岩溶水对灰岩的溶蚀作用对水文地球化学特征的贡献率为11.084%.
Through the monitoring of hydrogeochemical indexes of Xueyu Cave underground river under rainfall conditions, it was found that various indicators responded rapidly to rainfall, and there was a correlation between them.Primary component analysis was used to process each index data and the data could represent 82.761% of the information The results showed that the soil leaching represented by the increase of total Fe, total Mn, Al3 +, etc., with the three principal components of K, Na, Sr2 + concentration decreased, EC decreased as the representative of the dilution effect on the change of hydrogeochemical characteristics of the contribution rate of 41.718%, rainfall aggravated the karst soil erosion, while endangering the safety of drinking water, should cause enough attention of relevant departments; Karst The contribution of water to the dolomite dissolution and recharge area, the contribution of burrows to hydrogeochemical characteristics is 29.958%. The contribution of karst water, represented by the increase of Ca2 + concentration, to the limestone dissolution on the hydrogeochemical characteristics The rate was 11.084%.