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首页> 外文期刊>Applied Geochemistry: Journal of the International Association of Geochemistry and Cosmochemistry >Flow of river water into a Karstic limestone aquifer. 1. Tracing the young fraction in groundwater mixtures in the Upper Floridan Aquifer near Valdosta, Georgia
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Flow of river water into a Karstic limestone aquifer. 1. Tracing the young fraction in groundwater mixtures in the Upper Floridan Aquifer near Valdosta, Georgia

机译：河流水流入岩溶石灰岩含水层。 1.在佐治亚州瓦尔多斯塔附近的上佛罗里达含水层中追踪地下水混合物中的年轻部分

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The quality of water in the Upper Floridan aquifer near Valdosta, Georgia is affected locally by discharge of Withlacoochee River water through sinkholes in the river bed. Data on transient tracers and other dissolved substances, including Cl-, H-3, tritiogenic helium-3 (He-3), chlorofluorocarbons (CFC-11, CFC-12, CFC-113), organic C (DOC), O-2 (DO), H2S CH4, delta(18)O, delta D, and C-14 were investigated as tracers of Withlacoochee River water in the Upper Floridan aquifer. The concentrations of all tracers were affected by dilution and mixing. Dissolved Cl-, delta(18)O, delta D, CFC-12, and the quantity (H-3 + He-3) are stable in water from the Upper Floridan aquifer, whereas DOC, DO, H2S, CH4, C-14, CFC-11, and CFC-113 are affected by microbial degradation and other geochemical processes occurring within the aquifer. Groundwater mixing fractions were determined by using dissolved Cl- and delta(18)O data, recognizing 3 end-member water types in the groundwater mixtures: (1) Withlacoochee River water (delta(18)O = - 2.5 +/- 0.3 parts per thousand. Cl- = 12.2 +/- 2 mg/l), (2) regional infiltration water (delta(18)O = -4.2 +/- 0.1 parts per thousand, Cl- = 2.3 +/- 0.1 mg/l), and (3) regional paleowater resident in the Upper Floridan aquifer (delta(18)O = -3.4 +/- 0.1 parts per thousand, Cl- = 2.6 +/- 0.1 mg/l) (uncertainties are +/- sigma). Error simulation procedures were used to define uncertainties in mixing fractions. Fractions of river water in groundwater range from 0 to 72% and average 10%. The influence of river-water discharge on the qualify of water in the Upper Floridan aquifer was traced from the sinkhole area on the Withlacoochee River 25 km SE in the direction of regional groundwater how. Infiltration of water is most significant to the N and NW of Valdosta, but becomes negligible to the S and SE in the direction of general thickening of post-Eocene confining beds overlying the Upper Floridan aquifer. (C) 1998 Elsevier Science Ltd. All rights reserved. [References: 40]
机译：佐治亚州瓦尔多斯塔附近的佛罗里达上层含水层的水质受河床下泄的Withlacoochee河水的局部影响。关于瞬态示踪剂和其​​他溶解物质的数据，包括Cl-，H-3，三变氦3（He-3），氯氟烃（CFC-11，CFC-12，CFC-113），有机C（DOC），O- 2（DO），H2S CH4，δ（18）O，δD和C-14被用作佛罗里达上层含水层中Withlacoochee河水的示踪剂。所有示踪剂的浓度都受到稀释和混合的影响。溶解的Cl-，δ（18）O，δD，CFC-12和量（H-3 + He-3）在佛罗里达上层含水层的水中是稳定的，而DOC，DO，H2S，CH4，C-如图14所示，CFC-11和CFC-113受微生物降解和含水层中发生的其他地球化学过程的影响。利用溶解的Cl-和delta（18）O数据确定了地下水混合物中的3种末端水类型，从而确定了地下水的混合比例：（1）Withlacoochee河水（delta（18）O =-2.5 +/- 0.3份Cl- = 12.2 +/- 2 mg / l），（2）区域渗透水（delta（18）O = -4.2 +/- 0.1份/千，Cl- = 2.3 +/- 0.1 mg / l ），以及（3）居住在上佛罗里达水层中的区域古水（δ（18）O = -3.4 +/- 0.1千分之一，Cl- = 2.6 +/- 0.1 mg / l）（不确定度为+/- sigma ）。误差模拟程序用于定义混合分数的不确定性。地下水中河水的比例范围从0到72％，平均为10％。河水排放对上佛罗里达水层水位的影响是从东南部25 km的Withlacoochee河上的污水坑区域向区域地下水方向追溯的。水的渗透对Valdosta的N和NW最为重要，但在覆盖上佛罗里达水层的始新世后封闭层的总体增厚方向上，对S和SE的影响可忽略不计。 （C）1998 Elsevier ScienceLtd。保留所有权利。 [参考：40]

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