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Related Experiment Videos

Ground water whirls.

Kick Hemker1, Elmer van den Berg, Mark Bakker

  • 1Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081HV Amsterdam, The Netherlands. kick.hemker@falw.vu.nl

Ground Water
|March 24, 2004
PubMed
Summary
This summary is machine-generated.

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Ground water whirls, or spiraling flow lines, form in layered aquifers with differing hydraulic conductivities. These phenomena, driven by anisotropic layers, influence groundwater flow patterns around wells and in uniform flow fields.

Area of Science:

  • Hydrogeology
  • Geophysics
  • Fluid Dynamics

Background:

  • Layered aquifers exhibit complex groundwater flow due to variations in hydraulic conductivity.
  • Anisotropy in hydraulic conductivity significantly impacts groundwater movement, particularly in layered systems.
  • Understanding these flow patterns is crucial for effective groundwater resource management and contaminant transport modeling.

Purpose of the Study:

  • To investigate the occurrence and characteristics of ground water whirls in layered anisotropic aquifers.
  • To analyze the relationship between aquifer layering, hydraulic conductivity anisotropy, and the formation of ground water whirls.
  • To determine the impact of whirls on groundwater flow patterns, especially in the vicinity of wells.

Main Methods:

  • Numerical experiments were conducted using steady-state groundwater flow models.

Related Experiment Videos

  • Simulations focused on layered aquifers with differing anisotropic horizontal hydraulic conductivities in adjacent layers.
  • Analysis involved visualizing and quantifying the spiraling flow lines (ground water whirls).

    • Main Results:

    • Spiraling flow lines, termed ground water whirls, were observed in layered anisotropic aquifers.
    • Anisotropic layered blocks in uniform flow generate whirls aligned with the flow direction.
    • The number of whirls correlates with the number of interfaces between layers with differing anisotropic properties.
    • Flow to a well in a two-layer anisotropic aquifer with perpendicular principal directions results in whirls within specific quadrants.
    • A single anisotropic layer in an otherwise isotropic aquifer near a well generates eight whirls, with adjacent whirls rotating oppositely.

    Conclusions:

    • Layered anisotropy is a key factor in the formation of ground water whirls.
    • Ground water whirls significantly alter local flow fields, impacting groundwater flow to wells.
    • The study provides insights into complex flow dynamics in heterogeneous aquifers, essential for hydrogeological modeling.