A New Approach to Monitoring Groundwater/Surface Flow Relationships, Using 222Rn and SF6

天然~（222）Rn和有意引入的SF_6的测量 可用于准确检测和量化地下水输送 to stream流flow流. 实验，涉及同时 将在圣达菲河进行222 RN和SF6的测量 在佛罗里达。 222 Rn的异常高水平的检测 河流将允许识别地下水的位置 输入. SF6和222 Rn之间观察到的变化将用于 确定准确的气体交换率，这需要估计 地表排放的地下水成分。 的气体速率 交换，可以表示为复氧系数， 也是评估溪流水质的决定性因素。 因此，222 Rn和SF6一起测量将产生另一个 水质地球化学评价技术 系统. 水样中D/H和180/160比值的测定 在222 Rn调查期间从Sante Fe收集， 当降水量与 导出的地表径流和地下水的良好结合 组件最大化将提供独立检查， 根据222 Rn数据估算地下水输送量。 拟议中的研究将有利于水文学家和水 通过建立一个强大的新的地球化学 研究地下水之间相互联系的技术 表面流动。 此外，该研究还将提供 水文和水质数据库不易通过 常规方法。

The measurement of natural 222Rn and deliberately introduced SF6 can be used to accurately detect and quantify groundwater delivery to stream flow. Experiments, involving the simultaneous measurement of 222RN and SF6 will be conducted in the Santa Fe River in Florida. The detection of anomalously high levels of 222Rn in the stream will permit the identification of locations of groundwater input. The observed variations between SF6 and 222Rn will be used to determine accurate gas exchange rates, which are needed to estimate the groundwater component of surface discharge. The rate of gas exchange, which can be expressed as a reaeration coefficient, is also a determining factor in assessing water quality in a stream. Thus, the measurement of 222Rn and SF6 together will yield another geochemical technique for assessing the water quality of aquatic systems. Measurements of the D/H and 180/160 ratios in water samples collected from the Sante Fe during a 222Rn survey following a major precipitation event when the difference between the precipitation derived surface runoff and the well integrated groundwater component is maximized will provide an independent check on estimates of groundwater delivery based on the 222Rn data. The proposed research will benefit hydrologists and water resource managers by establishing a powerful new geochemical technique for examining the interconnections between groundwater and surface flow. In addition, the research will provide a hydrologic and water quality data base not easily obtained by conventional methods.