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首页> 外文期刊>Water resources research >Quantifying groundwater discharge to Cockburn River, southeastern Australia, using dissolved gas tracers ~(222)Rn and SF_6
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Quantifying groundwater discharge to Cockburn River, southeastern Australia, using dissolved gas tracers ~(222)Rn and SF_6

机译：使用溶解气体示踪剂〜（222）Rn和SF_6定量分析澳大利亚东南部Cockburn河的地下水排放量

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摘要

Groundwater discharge to the Cockburn River, southeast Australia, has been estimated from comparison of natural ~(222)Rn activities in groundwater and river water, interpreted using a numerical flow model that simulates longitudinal radon activities as a function of groundwater inflow, hyporheic exchange, evaporation, gas exchange with the atmosphere, and radioactive decay. An injection of SF_6 into the river to estimate the gas transfer velocity assisted in constraining the model. Previous estimates of groundwater inflow using ~(222)Rn activities have not considered possible input of radon due to exchange between river water and water in the hyporheic zone beneath the streambed. In this paper, radon input due to hyporheic exchange is estimated from measurements of radon production by hyporheic zone sediments and rates of water exchange between the river and the hyporheic zone. Total groundwater inflow to the Cockburn River is estimated to be 18500 m~3/d, although failure to consider hyporheic exchange would cause overestimation of the volume of groundwater inflow by approximately 70%.
机译：根据对地下水和河水中自然〜（222）Rn活度的比较，估算了澳大利亚东南部Cockburn河的地下水排放量，并使用数值流模型进行了解释，该模型模拟了纵向ra活动与地下水流入，水交换，蒸发，与大气的气体交换以及放射性衰变。向河中注入SF_6以估计气体传输速度，有助于约束该模型。以前使用〜（222）Rn活度估算的地下水入流量尚未考虑到possible的可能输入，这是由于河水与河床下方水流带中的水之间的交换所致。在本文中，通过低交换带沉积物的measurements生产量和河流与低交换带之间的水交换速率的测量值估算了低交换带引起的ra输入。考克伯恩河的地下水总流入量估计为18500 m〜3 / d，尽管不考虑低交换性会导致将地下水流入量高估约70％。

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