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A Falling-Head Method for Measuring Intertidal Sediment Hydraulic Conductivity

机译：落头法测量潮间带泥沙水力传导率

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摘要

This paper presents an in situ falling-head method for measuring hydraulic conductivity of beach sediments in tidal environment. A polyvinyl chloride (PVC) standpipe was vertically pushed into the submerged beach sediments so that its lower part was filled by a sediment column. During the experiment, the sediments were submerged by sea water and the standpipe top was higher than the sea level. The pipe was fully filled with sea water at the beginning of the experiment. Then the water level time series inside and outside the standpipe were recorded. Analytical solutions were derived to describe the relation among the sediment's hydraulic conductivity and the water levels inside and outside the standpipe and used to analyze the experiment data obtained from the intertidal zone of Puqian Bay, Haikou, Hainan Province, China. The water levels predicted by the analytical solution agreed very well with all the experiment data. Experiments for horizontal hydraulic conductivity estimation were also conducted using L-shaped standpipe which bends from vertical to horizontal in the beach sediments. The averaged hydraulic conductivity anisotropy ratio at the study area is about 2.9. After each in situ experiment, the sediments in the standpipe were stored in a plastic box and transported to university laboratory to measure the hydraulic conductivity using falling-head method. It is found that the in situ hydraulic conductivity averages one order of magnitude greater than the laboratory one, indicating that the original beach surface sediments were loose due to tidal and wave actions and that the samples were significantly compacted during the transportation to laboratory.
机译：本文提出了一种潮汐环境下原位落头法测量海滩沉积物水力传导率的方法。垂直将聚氯乙烯（PVC）竖管推入淹没的海滩沉积物中，使其下部由一个沉积柱填充。在实验过程中，沉积物被海水淹没，竖管顶部高于海平面。在实验开始时，管道中已充满海水。然后记录竖管内外的水位时间序列。推导了解析解来描述沉积物的水力传导率与竖管内外水位之间的关系，并用于分析从海南省海口市浦前湾潮间带获得的实验数据。分析解决方案预测的水位与所有实验数据非常吻合。还使用L形立管进行了水平水力传导率估算的实验，该立管在海滩沉积物中从垂直弯曲成水平。研究区域的平均水力传导率各向异性比约为2.9。每次原位实验后，将立管中的沉积物存储在一个塑料盒中，然后运到大学实验室，采用落头法测量水力传导率。结果发现，原地的水力传导率平均比实验室的高一个数量级，这表明原始海滩表面的沉积物由于潮汐和波浪作用而疏松，并且在运往实验室的过程中样品被显着压实。

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  • 来源
    《Ground water》 |2010年第2期|206-211|共6页
  • 作者

    Hailong Li; Pingping Sun; Shi Chen; Yuqiang Xia; Shuang Liu;

  • 作者单位

    Department of Civil and Environmental Engineering, Temple University, 1947 N. 12th Street, Philadelphia, PA 19122, USA School of Environmental Studies ft (M0E) Biogeology and Environmental Geology Lab, China University of Geosciences, Wuhan 430074, China Department of Mathematics, Anshan Normal University, Anshan 114005, China;

    School of Environmental Studies ft (M0E) Biogeology and Environmental Geology Lab, China University of Geosciences, Wuhan 430074, China Department of Hydrology Et Environmental Geology, Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China;

    School of Environmental Studies ft (M0E) Biogeology and Environmental Geology Lab, China University of Geosciences, Wuhan 430074, China Institute of Hydrogeology, Xi'an Branch, China Coal Research Institute, Xi'an 710054, China;

    School of Environmental Studies ft (M0E) Biogeology and Environmental Geology Lab, China University of Geosciences, Wuhan 430074, China;

    Department of Mathematics, Anshan Normal University, Anshan 114005, China;

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