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Related Experiment Video

Updated: May 27, 2026

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
07:14

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Published on: May 1, 2018

Spatial and temporal infiltration dynamics during managed aquifer recharge.

Andrew J Racz1, Andrew T Fisher, Calla M Schmidt

  • 1Department of Earth and Planetary Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA. aracz@ucsc.edu

Ground Water
|November 5, 2011
PubMed
Summary
This summary is machine-generated.

Quantifying natural groundwater recharge is challenging. Managed aquifer recharge (MAR) infiltration ponds offer semi-controlled conditions to measure recharge, revealing high initial rates that decrease over time.

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Area of Science:

  • Hydrology
  • Hydrogeology
  • Environmental Science

Background:

  • Natural groundwater recharge is difficult to quantify due to spatial and temporal variability.
  • Managed aquifer recharge (MAR) systems, specifically infiltration ponds, offer a semi-controlled environment to study recharge processes.
  • Understanding infiltration dynamics is crucial for effective water resource management and aquifer sustainability.

Purpose of the Study:

  • To compare whole-pond and point-specific methods for quantifying infiltration in a MAR pond.
  • To analyze the spatial and temporal variability of infiltration rates and soil hydraulic conductivity.
  • To investigate the 'variable source area' concept in relation to MAR infiltration.

Main Methods:

  • Instrumentation of a 3-hectare MAR infiltration pond.
  • Whole-pond infiltration determined using transient water budget analysis.
  • Point-specific infiltration measured using heat as a tracer and time series analysis at eight locations.
  • Calculation of soil hydraulic conductivity using head gradients and infiltration rates.

Main Results:

  • Whole-pond infiltration rates initially exceeded 1.0 m/d, sustained high rates for 40 days, then decreased significantly.
  • Point-specific infiltration rates showed high spatial and temporal variability, generally lower than whole-pond estimates.
  • Soil hydraulic conductivity initially increased then decreased by one to two orders of magnitude over 50-75 days.
  • Rapid infiltration locations shifted laterally, suggesting a 'variable source area' process.

Conclusions:

  • Whole-pond and point-specific methods provide different perspectives on MAR infiltration dynamics.
  • Infiltration in MAR ponds exhibits significant spatial and temporal variability, influenced by changing soil hydraulic properties.
  • The 'variable source area' concept may be applicable to understanding infiltration patterns in MAR systems.