Geophysical Methods for Investigating Ground-Water Recharge

Ferré, Ty P. A.; Binley, Andrew; Blasch, Kyle W.; Callegary, James B.; Crawford, Steven M.; Fink, James B.; Flint, Lorraine E.; Hoffmann, John P.; Izbicki, John A.; Levitt, Marc T.; Pool, D. R.; Scanlon, Bridget R.

doi:10.3133/pp17032

Cited by 5 publications

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“…The plot also shows the position of the wetting front estimated from sequential EM logs collected through the 5‐cm‐diameter PVC monitoring well within the borehole. These data were discussed by Ferré et al (2007) and are not otherwise discussed in this paper. Initially, the wetting front moved downward through the reworked alluvium underlying the pond at a rate exceeding 6 m/d.…”

Section: Resultsmentioning

confidence: 87%

Artificial Recharge Through a Thick, Heterogeneous Unsaturated Zone

Izbicki¹,

Flint

Stamos

2008

Groundwater

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Thick, heterogeneous unsaturated zones away from large streams in desert areas have not previously been considered suitable for artificial recharge from ponds. To test the potential for recharge in these settings, 1.3 x 10(6) m(3) of water was infiltrated through a 0.36-ha pond along Oro Grande Wash near Victorville, California, between October 2002 and January 2006. The pond overlies a regional pumping depression 117 m below land surface and is located where thickness and permeability of unsaturated deposits allowed infiltration and saturated alluvial deposits were sufficiently permeable to allow recovery of water. Because large changes in water levels caused by nearby pumping would obscure arrival of water at the water table, downward movement of water was measured using sensors in the unsaturated zone. The downward rate of water movement was initially as high as 6 m/d and decreased with depth to 0.07 m/d; the initial time to reach the water table was 3 years. After the unsaturated zone was wetted, water reached the water table in 1 year. Soluble salts and nitrate moved readily with the infiltrated water, whereas arsenic and chromium were less mobile. Numerical simulations done using the computer program TOUGH2 duplicated the downward rate of water movement, accumulation of water on perched zones, and its arrival at the water table. Assuming 10 x 10(6) m(3) of recharge annually for 20 years, a regional ground water flow model predicted water level rises of 30 m beneath the ponds, and rises exceeding 3 m in most wells serving the nearby urban area.

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Section: Resultsmentioning

confidence: 87%

Artificial Recharge Through a Thick, Heterogeneous Unsaturated Zone

Izbicki¹,

Flint

Stamos

2008

Groundwater

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“…Ground‐penetrating radar surveys can be performed rapidly and provide high vertical and horizontal resolutions. Under favorable conditions, GPR can be used in groundwater recharge studies (Ferré et al, 2007; Strobach et al, 2010). However, an inherent limitation of GPR for most MAR applications is its shallow depth of investigation, especially in electrically conductive media.…”

Section: Background and Motivationmentioning

confidence: 99%

Assessment of Managed Aquifer Recharge Sites Using a New Geophysical Imaging Method

Behroozmand

Auken

Knight

2019

Vadose Zone Journal

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Core Ideas We introduce a new geophysical imaging method to assess managed aquifer recharge sites. This method provides high‐resolution 3D imaging of the subsurface down to a minimum depth of 50 m. We introduce Resistivity Distribution Plot as a new approach to assign a saturated–unsaturated boundary. In many places around the world, much attention is focused on managed aquifer recharge (MAR) because of reduced groundwater levels due to droughts. To assess the suitability of a site for MAR, detailed three‐dimensional (3D) information about the subsurface materials and their hydraulic properties is needed. In areas where the groundwater level is at an intermediate depth (e.g., 20–40 m), such information is needed from the ground surface down to a minimum depth of ∼50 m. To achieve this goal, we used a new geophysical imaging system: a towed time‐domain electromagnetic system that is efficient for acquiring data at a significantly improved resolution and a scale needed for MAR. During a 2‐d period, we acquired ∼92 line‐kilometers of data in one almond [Prunus dulcis (Mill.) D.A. Webb] grove, one pistachio (Pistacia vera L.) grove, one open field, and two active recharge basins in the Tulare Irrigation District in the Central Valley of California. At each site, a detailed 3D resistivity model with a resolution down to the 10‐ by 10‐m scale is presented in terms of resistivity distribution plots, which are then used to assign a saturated–unsaturated boundary. In addition, we used a resistivity–lithology transform to interpret the resistivity models and create lithology maps at each site. We used this information to assess the suitability of each site for MAR.

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An overview of the hydrology of non‐perennial rivers and streams

et al. 2021

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Non‐perennial rivers and streams are ubiquitous on our planet. Although several metrics have been used to statistically group or compare streamflow characteristics, there is currently no widely used definition of how many days or over what reach length surface flow must cease in order to classify a river as non‐perennial. At the same time, the breadth of climate and geographic settings for non‐perennial rivers leads to diversity in their flow regimes, such as how often or how quickly they go dry. These rivers have a rich and expanding body of literature addressing their ecologic and geomorphic features, but are often said to be ignored by hydrologists. Yet there is much we do know about their hydrology in terms of streamflow generation processes, water losses, and variability in flow. We also know that while they are prevalent in arid regions, they occur across all climate types and experience a diverse set of natural and anthropogenic controls on streamflow. Furthermore, measuring and modeling the hydrology of these rivers presents a distinct set of challenges, and there are many research directions, which still require further attention. Therefore, we present an overview of the current understanding, methodologic challenges, knowledge gaps, and research directions for hydrologic understanding of non‐perennial rivers; critical topics in light of both growing global water scarcity and ever‐changing laws and policies that dictate whether and how much environmental protection these rivers receive. This article is categorized under: Science of Water > Science of Water

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Geophysical Methods for Investigating Ground-Water Recharge

Cited by 5 publications

References 0 publications

Artificial Recharge Through a Thick, Heterogeneous Unsaturated Zone

Artificial Recharge Through a Thick, Heterogeneous Unsaturated Zone

Assessment of Managed Aquifer Recharge Sites Using a New Geophysical Imaging Method

An overview of the hydrology of non‐perennial rivers and streams

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