Geologic map database of the El Mirage Lake area, San Bernardino and Los Angeles Counties, California

Miller, David M.

doi:10.3133/ofr00222

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…SC Wash is the current trunk stream of the Holocene (Miller and Bedford, 2000) SC fan (Fig. 2), whose source area is located in the San Gabriel Mountains near the town of Wrightwood.…”

Section: Methodsmentioning

confidence: 99%

Resolving Structural Influences on Water‐Retention Properties of Alluvial Deposits

Winfield

Nimmo

Izbicki

et al. 2006

Vadose Zone Journal

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With the goal of improving property‐transfer model (PTM) predictions of unsaturated hydraulic properties, we investigated the influence of sedimentary structure, defined as particle arrangement during deposition, on laboratory‐measured water retention (water content vs. potential [θ(ψ)]) of 10 undisturbed core samples from alluvial deposits in the western Mojave Desert, California. The samples were classified as having fluvial or debris‐flow structure based on observed stratification and measured spread of particle‐size distribution. The θ(ψ) data were fit with the Rossi–Nimmo junction model, representing water retention with three parameters: the maximum water content (θmax), the ψ‐scaling parameter (ψo), and the shape parameter (λ). We examined trends between these hydraulic parameters and bulk physical properties, both textural—geometric mean, Mg, and geometric standard deviation, σg, of particle diameter—and structural—bulk density, ρb, the fraction of unfilled pore space at natural saturation, Ae, and porosity‐based randomness index, Φs, defined as the excess of total porosity over 0.3. Structural parameters Φs and Ae were greater for fluvial samples, indicating greater structural pore space and a possibly broader pore‐size distribution associated with a more systematic arrangement of particles. Multiple linear regression analysis and Mallow's Cp statistic identified combinations of textural and structural parameters for the most useful predictive models: for θmax, including Ae, Φs, and σg, and for both ψo and λ, including only textural parameters, although use of Ae can somewhat improve ψo predictions. Textural properties can explain most of the sample‐to‐sample variation in θ(ψ) independent of deposit type, but inclusion of the simple structural indicators Ae and Φs can improve PTM predictions, especially for the wettest part of the θ(ψ) curve.

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“…SC Wash is the current trunk stream of the Holocene (Miller and Bedford, 2000) SC fan (Fig. 2), whose source area is located in the San Gabriel Mountains near the town of Wrightwood.…”

Section: Methodsmentioning

confidence: 99%

Resolving Structural Influences on Water‐Retention Properties of Alluvial Deposits

Winfield

Nimmo

Izbicki

et al. 2006

Vadose Zone Journal

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“…The Mojave River groundwater basin (fig. A.2) includes large alluvial fan complexes eroded from the San Gabriel Mountains known as the Victorville and the Sheep Creek fans (Meisling and Weldon, 1989;Miller and Bedford, 2000;Stamos and others, 2001). These alluvial fans were deposited by streams that were tributaries to the Mojave River in the geologic past.…”

Section: A3 Chromium In Rock and Alluvium Within The Mojave River Dra...mentioning

confidence: 99%

Introduction to study area hydrogeology, chromium sources, site history, and purpose of study

Izbicki¹,

Groover²,

Miller³

et al. 2023

Professional Paper

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This study was developed by the U.S. Geological Survey (USGS) with input from a technical working group (TWG) composed of community members, the Lahontan Regional Water Quality Control Board (RWQCB), the Independent Review Panel Manager (Project Navigator, Ltd.), Pacific Gas and Electric Company (PG&E), and consultants for PG&E. The study was funded cooperatively under an agreement between the Lahontan RWQCB and the USGS. Funding for the study was provided by PG&E to the Lahontan RWQCB. Logistical support for field work, including access to wells, was provided by PG&E. The TWG met approximately quarterly during the study to provide input to the study, and the Hinkley community was updated annually on study progress.The authors thank the many people involved in the design and implementation of this study including the staff of the Lahontan RWQCB, the staff of PG&E and their consultants, and the staff of Project Navigator, Ltd. The authors also acknowledge and thank the many involved community members who allowed access to their properties for sample collection, and who collectively donated thousands of hours on behalf of the local community in support of this project and for resolution of other issues related to anthropogenic hexavalent chromium, Cr(VI), within the Hinkley area.

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Selected trace-elements in alluvium and rocks, western Mojave Desert, southern California

Groover

Izbicki

2019

Journal of Geochemical Exploration

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Geologic map database of the El Mirage Lake area, San Bernardino and Los Angeles Counties, California

Cited by 4 publications

References 19 publications

Resolving Structural Influences on Water‐Retention Properties of Alluvial Deposits

Resolving Structural Influences on Water‐Retention Properties of Alluvial Deposits

Introduction to study area hydrogeology, chromium sources, site history, and purpose of study

Selected trace-elements in alluvium and rocks, western Mojave Desert, southern California

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