Geologic framework and hydrostratigraphy of the Edwards and Trinity aquifers within northern Medina County, Texas

Clark, Allen L.; Morris, Robert E.; Pedraza, Diana E.

doi:10.3133/sim3461

Cited by 2 publications

(5 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The correlation between these lithology classes is also opposite to that of carbonate rocks. Sedimentary units are relatively widespread at the surface across this basin and often overlie carbonate rocks (Clark et al., 2020). These results from the random forest regression are supported by the distribution of points on the PCA biplot which shows that variations in major chemical constituents follow increases in carbonate lithology as well as increases in sedimentary units.…”

Section: Discussionmentioning

confidence: 99%

“…Karst features are common and host several large and productive aquifers that intersect the Colorado River watershed near the Gulf Coast. The major structural feature intersecting the Colorado River is the inactive late Oligocene to early Miocene Balcones fault zone, which is a network of NE‐striking high‐angle normal faults (Figure 1d) that predominantly dip southeast (Clark et al., 2020). The upper Colorado River is dominated by carbonate outcrops with gypsum inclusions (Leifeste & Lansford, 1968; Richter et al., 1991).…”

Section: Methodsmentioning

confidence: 99%

“…This systematic change in lithology and thus mineralogy across the watershed may control solute contributions to the Colorado River. Quaternary sedimentary deposits (conglomerates, sandstones, and mudstones), Cretaceous sedimentary carbonates, and gypsum and halite units are common rock types across the Colorado River basin (Clark et al., 2020). Karst features are common and host several large and productive aquifers that intersect the Colorado River watershed near the Gulf Coast.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Regional Drivers of Stream Chemical Behavior: Leveraging Lithology, Land Use, and Climate Gradients Across the Colorado River, Texas USA

Mark

Ricketts

et al. 2022

Water Resources Research

View full text Add to dashboard Cite

Understanding relationships between stream chemistry and watershed factors: land use/land cover, climate, and lithology are crucial to improving our knowledge of critical zone processes that influence water quality. We compiled major ion data from >100 monitoring stations collected over 60 years (1958–2018) across the Colorado River Watershed in Texas (103,000 km2). We paired this river chemistry data with complementary lithology, land use, climate, and stream discharge information. Machine learning techniques were used to produce new insights on controls of stream water chemical behavior, which were validated using traditional multivariate analyses. Studies on stream flow and chemistry in the American west and globally have shown strong relationships between major ion chemical composition, climate, and lithology which hold true for the Colorado River basin in this study. Reactive minerals, including carbonates and evaporites, dominate major ion chemistry across the upper, low‐precipitation regions of the watershed. Upstream and middle reaches of the Colorado River showed shifts from Na‐Cl‐SO4 dominated water from multiple sources including dissolution of gypsum and halite in shallow groundwater, and agricultural activities, to Ca‐HCO3 water types controlled by carbonate dissolution. In the lower portion of the watershed multiple analyses demonstrate that stream chemistry is more influenced by greater precipitation and the presence of silicate minerals than the middle and upstream reaches. This study demonstrates the power of applying machine learning approaches to publicly available long term water chemistry data sets to improve the understanding of watershed interactions with surficial lithology, salinity sources, and anthropogenic influences of water quality.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Regional Drivers of Stream Chemical Behavior: Leveraging Lithology, Land Use, and Climate Gradients Across the Colorado River, Texas USA

Mark

Ricketts

et al. 2022

Water Resources Research

View full text Add to dashboard Cite

show abstract

“…The western, upthrown fault block is composed of Lower Cretaceous limestones, including the Glen Rose, and the Edwards and Walnut formations (Fredericksburg Group) (Figure 1). These limestones mainly consist of hard limestone layers interbedded with softer marly/clay-rich layers [41][42][43][44].…”

Section: Climatic and Geologic Settingsmentioning

confidence: 99%

“…The Del Rio Clay is a laminated, calcareous, and gypsiferous mudstone with varying amounts of pyrite [45]. The clay in the Del Rio Formation exhibits a shrink-swell behavior and is primarily composed of montmorillonite, smectite, and kaolinite, with minor amounts of illite [43,46,47]. These minerals exhibit very low shear strength when saturated with water [48].…”

Section: Climatic and Geologic Settingsmentioning

confidence: 99%

Kinematics and Controlling Factors of Slow-Moving Landslides in Central Texas: A Multisource Data Fusion Approach

Gebremichael,

Hernandez,

Alsleben

et al. 2024

Geosciences

View full text Add to dashboard Cite

The Austin metropolitan area has experienced unprecedented economic and population growth over the past two decades. This rapid growth is leading communities to settle in areas susceptible to landslides, necessitating a comprehensive analysis of landslide risks and the development of early warning systems. This could be accomplished with better confidence for slow-moving landslides, whose occurrences could be forecasted by monitoring precursory ground displacement. This study employed a combination of ground- and satellite-based observations and techniques to assess the kinematics of slow-moving landslides and identify the controlling and triggering factors that contribute to their occurrence. By closely examining landslide events in the Shoal Creek area, potential failure modes across the study area were inferred. The findings revealed that landslide-prone areas are undergoing creep deformation at an extremely slow rate (up to −4.29 mm/yr). These areas lie on moderate to steep slopes (>22°) and are predominantly composed of clay-rich units belonging to the Del Rio and Eagle Ford formations. Based on the incidents at Shoal Creek, episodes of intense rainfall acting on the landslide-prone areas are determined to be the main trigger for landslide processes in the region.

show abstract

Geologic framework and hydrostratigraphy of the Edwards and Trinity aquifers within northern Medina County, Texas

Abstract: Geologic framework and hydrostratigraphy of the Edwards and Trinity aquifers within northern Medina County, Texas Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83). Altitude, as used in this report, refers to distance above the vertical datum.

Cited by 2 publications

References 27 publications

Regional Drivers of Stream Chemical Behavior: Leveraging Lithology, Land Use, and Climate Gradients Across the Colorado River, Texas USA

Regional Drivers of Stream Chemical Behavior: Leveraging Lithology, Land Use, and Climate Gradients Across the Colorado River, Texas USA

Kinematics and Controlling Factors of Slow-Moving Landslides in Central Texas: A Multisource Data Fusion Approach

Contact Info

Product

Resources

About