Enabling the Application of Large Footprint Open‐Bottom Permeameters Through New Shape Factors
Enabling the Application of Large Footprint Open‐Bottom Permeameters Through New Shape Factors
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DOI：
10.1029/2020wr029315
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发表时间：
2021-05
影响因子：
5.4
通讯作者：
V. Zlotnik;K. Cole;M. Cardenas;Anatoly Zlotnik
中科院分区：
文献类型：
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作者：
V. Zlotnik;K. Cole;M. Cardenas;Anatoly Zlotnik
开底渗透率计 (OBP) 通常用于估算水体下沉积物床的水力特性以及沉积物-水界面的通量。 OBP 流动情况的特定形状因子对于数据解释是必要的。它由渗透计管半径与管在沉积物中的穿透深度之比确定。以前的渗透计设计偏向于小半径，这允许更深的穿透和管的稳定性。此处提供的形状系数适用于大尺寸 OBP，可实现浅穿透和更大半径。通过 OBP 流体动力学的数值和分析模型研究，先前关于 OBP 形状因子的知识被推广到可能实际应用的整个半径与穿透比范围。结果揭示了大占地面积设计的优点，包括由于能够在更短的测试持续时间内施加更大的放电而具有更好的灵敏度。
Open‐bottom permeameters (OBP) are commonly used for estimating the hydraulic properties of sediment beds under water bodies and fluxes across the sediment‐water interface. The specific shape factor for an OBP flow situation is necessary for data interpretation. It is determined by the ratio of the permeameter tube radius to the tube's penetration depth within the sediment. Previous permeameter designs favored small radii which allowed for deeper penetration and stability of the tube. The shape factor is provided here for large footprint OBPs that allows for shallow penetration and greater radius. Through a numerical and analytical modeling study of the OBP hydrodynamics, previous knowledge on the OBP shape factor is generalized to the entire range of radius‐to‐penetration ratios that might be practically applied. The results reveal the advantages of the large footprint design, including better sensitivity due to the ability to impose larger discharge over a shorter test duration.