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Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole
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Published on: August 26, 2019

Computing Flow-Field Distortion Coefficients from Well-Construction and Formation Properties.

E Randall Bayless1, Chad J Ostheimer2, Robert A Darner

  • 1U.S. Geological Survey (retired), Ohio-Kentucky-Indiana Water Science Center, Indianapolis, IN.

Ground Water
|July 3, 2026
PubMed
Summary
This summary is machine-generated.

Groundwater velocity measurements require correction for borehole acceleration. This study provides an Excel tool using Drost et al.

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Area of Science:

  • Hydrogeology
  • Environmental Engineering
  • Geophysics

Background:

  • Direct groundwater velocity measurements using borehole flowmeters are affected by flow-field distortion.
  • This distortion, also known as borehole acceleration, alters flowline paths around well screens.
  • Accurate groundwater velocity estimation necessitates correcting for these distortions.

Purpose of the Study:

  • To develop a computational tool for correcting groundwater velocity measurements.
  • To simplify the application of theoretical equations for flow-field distortion.
  • To improve the accuracy of direct groundwater velocity measurements in screened wells.

Main Methods:

  • Programmed Drost et al.'s (1968) theoretical equation into an Excel workbook.
  • Incorporated inputs for well construction and geologic formation hydraulic properties.
  • Utilized tables for physical and hydraulic properties of well components and gravel packs.

Main Results:

  • The workbook facilitates computation of the flow-field distortion coefficient.
  • Flowline convergence/divergence is linked to hydraulic conductivity contrasts.
  • A method is provided to adjust measured velocities for more accurate formation velocity estimates.

Conclusions:

  • The developed Excel workbook aids groundwater-flowmeter users in correcting velocity data.
  • Accurate groundwater velocity assessment is crucial for understanding aquifer dynamics.
  • The tool accounts for the impact of well design on flow patterns.