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首页> 外文期刊>Estuarine Coastal and Shelf Science >Pollutant advective spreading in beach sand exposed to high-energy tides
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Pollutant advective spreading in beach sand exposed to high-energy tides

机译：污染物对流扩散在暴露于高能潮的沙滩上

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This paper presents field measurements in which dye solute was injected into coastal sand to investigate contaminant advection in intertidal beach sand. The measurements show the pathways of a contaminated plume in the unsaturated zone during both the flood and ebb tides. A prescribed amount of dye tracer solution was directly injected through the topsoil, with average porosity 0.3521 +/- 0.01, at predetermined locations of the River Mersey's outer estuarial beach during ebb-tide. The injected dye was monitored, sampled and photographed over several tidal cycles. The distinctive features of the plume (full two dimensional cross-sections), sediments and water-table depth were sampled in-situ, close to the injection point (differing from previous contaminant monitoring tests in aquifers). The advective movement is attributed to tidal impact which is different from contaminant transport in aquifers. The experimental results show that plumes have significantly large spatial variability, diverging upwards and converging downwards, with a conical geometric shape which is different from the usual spherical/elliptical shape reported in literature. The mean vertical motion of the plume reaches three times the top-width within ten tidal cycles, exceeding the narrow bottom-width by a factor of order 2. The observed transport features of the plume within the beach sand have significant relevance to saltwater intrusion, surface water and groundwater quality. The field observations are unique and can serve as a valuable benchmark database for relevant numerical studies. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文介绍了现场测量，其中将染料溶质注入沿海沙滩中，以调查潮间带沙滩中的污染物对流。测量结果表明，在洪水和退潮期间，不饱和区中的污染羽流的路径。在退潮期间，将规定量的染料示踪剂溶液直接注入表层土壤中，平均孔隙度为0.3521 +/- 0.01，进入默西河外河口海滩的预定位置。在多个潮气周期中对注入的染料进行监控，采样和拍照。在靠近注入点的位置就地采样了羽状流（完整的二维横截面），沉积物和地下水位的独特特征（与之前在含水层中进行的污染物监测测试不同）。对流运动归因于潮汐影响，这与含水层中的污染物迁移不同。实验结果表明，羽流具有很大的空间变异性，向上发散和向下收敛，其圆锥形几何形状不同于文献中报道的通常的球形/椭圆形形状。羽流的平均垂直运动在十个潮汐周期内达到了顶部宽度的三倍，比狭窄的底部宽度高了2倍。观察到的海滩砂流中的羽流的运输特征与盐水入侵密切相关，地表水和地下水水质。现场观测是独特的，可以作为相关数值研究的宝贵基准数据库。 （C）2016 Elsevier Ltd.保留所有权利。

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