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首页> 外文期刊>Marine Chemistry >Estimating submarine groundwater discharge around Isola La Cura, northern Venice Lagoon (Italy), by using the radium quartet
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Estimating submarine groundwater discharge around Isola La Cura, northern Venice Lagoon (Italy), by using the radium quartet

机译：利用镭四方估计北威尼斯泻湖（意大利）伊索拉拉库拉附近的海底地下水排放量

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摘要

The four naturally-occurring radium isotopes (~(223)Ra, ~(224)Ra, ~(226)Ra and ~(228)Ra) were used to estimate the submarine groundwater discharge (SGD) in the Isola La Cura marsh area in the northern Venice Lagoon (Italy). By determining the radium contributors to the study area (river, coastal ocean and sediments) the radium excess in the lagoon water was quantified through a mass balance model. This radium excess is attributed to a submarine groundwater discharge source and represents the most important input of radium. Possible endmembers were considered from analysis of groundwater samples (subtidal and marsh piezometers, marsh wells and seepage meters) that were enriched in Ra by one to two orders of magnitude relative to surface waters. In particular, a permeable layer at 80 cm depth in the surrounding marsh is considered to be representative of the most likely SGD source, although similar radium activities were measured in other subtidal porewater samples collected in the Isola La Cura area. The estimated SGD flux to the study area ranged from 1 · 10~9 to 6 · 10~9 L-d~(-1), the same order of magnitude as the overall riverine input to the lagoon (3 · 10~9 Ld~(-1)). A major fraction of this SGD flux is likely recirculated seawater, as evidenced by the endmember salinity. The water residence time of 2 days was estimated by both using the shortest-lived radium isotope and estimating the volume of water exchanged between the lagoon and the open sea during a tidal cycle (tidal prism approach). This SGD flux could be used to estimate the input of other chemical species (metals, nutrients, etc.) via SGD which might affect the Venice Lagoon ecosystem.
机译：使用四种天然存在的镭同位素（〜（223）Ra，〜（224）Ra，〜（226）Ra和〜（228）Ra）估算Isola La Cura沼泽地区的海底地下水排放量（SGD）在北部威尼斯泻湖（意大利）。通过确定研究区域（河流，沿海海洋和沉积物）的镭元素，通过质量平衡模型对泻湖水中的镭过量进行了定量。镭的过量归因于海底地下水排放源，是镭最重要的输入。通过分析地下水样品（潮汐和沼泽压力计，沼泽井和渗流计）来考虑可能的最终成员，这些样品相对于地表水而言，其Ra富集了1-2个数量级。特别是，尽管在Isola La Cura地区收集的其他潮下带孔隙水样品中也测出了类似的镭活度，但周围沼泽中80厘米深的渗透层被认为是最可能的SGD源。估计进入研究区的SGD通量范围为1·10〜9至6·10〜9 Ld〜（-1），与整个泻湖河流输入量的数量级相同（3·10〜9 Ld〜（ -1））。正如最终成员的盐度所证明的那样，这种SGD流量的很大一部分可能是再循环海水。通过使用寿命最短的镭同位素和估计潮汐周期（潮汐棱镜法）在泻湖和公海之间交换的水量来估算2天的水停留时间。该SGD通量可用于通过SGD估计可能影响威尼斯泻湖生态系统的其他化学物种（金属，营养物等）的输入。

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