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岩溶水中锶元素来源于碳酸盐岩地层的溶解,其浓度受地层岩性及地下水径流条件的控制。通过对贵州荔波板寨地下河流域微量元素锶的水文地球化学特征分析,发现在纯碳酸盐岩流域范围内,岩溶水中锶浓度只受控于地下水径流条件,因而Ca/Sr值能良好的示踪岩溶区地下水循环。在本文中,以Ca/Sr值为判别依据,将板寨地下河流域7个水样点划分为3类,分别为管流带/饱水带水、地下河水及表层岩溶带水。通过对流域水文地质条件分析,地下河流域总排泄量由表层带岩溶水和管流带/饱水带岩溶水两个端元组成。径流切割结果表明,在2009年12月至2010年2月,虽然在地下河径流排泄量中饱水带岩溶水一直占有优势,但表层带岩溶水的贡献比也很可观,均大于40%。但受极端大旱气候的影响,2010年3月末表层岩溶带岩溶水几乎枯竭,其贡献比陡降至7.1%,说明降水对该流域岩溶水循环方式起着控制作用。
Strontium in karst water is derived from the dissolution of carbonate rocks and its concentration is controlled by lithology and groundwater runoff conditions. By analyzing the hydrogeochemical characteristics of trace elements strontium in Banpozhai subterranean stream in Libo, Guizhou Province, it is found that the strontium concentration in karst water is only controlled by the groundwater runoff in the pure carbonate watershed, and the Ca / Sr value is good Tracer karst groundwater circulation. In this paper, based on the Ca / Sr value, seven water sampling sites in the subterranean river basin of Banzhai are divided into three types, namely the tube flow zone / water zone, underground river and surface karst zone respectively. By analyzing the hydrogeological conditions of the river basin, the total discharge of the underground river basin is composed of two end units of karst water in the surface zone and karst water in the pipe flow zone / saturation zone. The results of runoff cutting show that although the karst water in the subsurface river runoff has been predominant over the period from December 2009 to February 2010, the contributing ratio of karst water in the surface zone is also quite significant, both of which are over 40%. However, due to extreme drought conditions, the karst water in epikarst was almost depleted at the end of March 2010, and its contribution dropped sharply to 7.1%. This shows that precipitation plays a controlling role in the karst water circulation in this basin.