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首页> 外文期刊>Hydrogeology journal >A radioisotope tracer investigation to determine the direction of groundwater movement adjacent to a tidal creek during spring and neap tides
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A radioisotope tracer investigation to determine the direction of groundwater movement adjacent to a tidal creek during spring and neap tides

机译：放射性同位素示踪剂调查，以确定春季和潮汐潮汐时潮汐小溪附近的地下水运动方向

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摘要

A radioisotope tracer (Br-82) was injected into a sand aquifer adjacent to a tidal creek at Hat Head, New South Wales, Australia. The injection was timed to coincide with the falling limb of a spring tide in August 2001 and was repeated in July 2002 during a period of neap tides. The tracer movement was detected using gamma logging and fixed gamma detectors in a bore 0.9 m from an injection bore and in a line approximately perpendicular to the creek. Movement of the tracer was detected by comparing measured gamma activity with calibrated activities determined under laboratory conditions. Net movement of the tracer indicated approximately 0.001 m/day laterally towards the creek and 0.07 m/day vertically upward during spring tide conditions. This pattern is reversed during neap tide conditions with little net vertical movement but horizontal movement of 0.15 m/day. The measurements indicated an oscillatory motion coinciding with the tide but lagging the tide by approximately 4.5-6.5 h. The vertical flow during spring tides indicates that vertical movement of the saline interface occurs and results in mixing of different water types beneath the banks of the creek.
机译：将放射性同位素示踪剂（Br-82）注入澳大利亚新南威尔士州Hat Head靠近潮汐小溪的含水层中。注射的时间定于2001年8月的一次春季潮落，并在2002年7月的一次小潮期间再次注射。使用伽马测井仪和固定伽马探测器在距注入孔0.9 m的孔内和大致垂直于小溪的直线中检测到示踪剂的运动。通过将测得的伽马活性与实验室条件下确定的校准活性进行比较，可以检测示踪剂的运动。示踪剂的净运动表明，在春季潮汐条件下，向小溪侧向大约移动0.001 m / day，垂直向上向大方向移动0.07 m / day。在潮汐条件下，这种模式被反转，净垂直运动很少，但水平运动为0.15 m / day。测量结果表明，潮汐运动与潮汐一致，但滞后潮汐约4.5-6.5 h。春季潮汐期间的垂直流表明发生了盐分界面的垂直运动，并导致小溪两岸以下不同类型的水混合。

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