Unified Interior Regions

Region 6: Arkansas-Rio Grande-Texas-Gulf

Regions L2 Landing Page Tabs

Filter Total Items: 141
Date published: April 17, 2016
Status: Active

Macroclimatic Controls of Coastal Wetland Ecosystem Structure and Function

At the global-scale, macroclimatic drivers govern ecosystem structure and function in tidal saline wetlands (e.g., salt marshes, mangrove forests, salt flats). However, global reviews and models for these ecosystems typically do not directly include climatic drivers. The objective of this research is to examine and forecast the effects of macroclimatic drivers on wetland ecosystem structure...

Date published: April 17, 2016
Status: Active

Geographical Trends in Ecosystem Function and Biodiversity of Wetlands as a Surrogate for Climate Change

Extreme drought and temperature in the southeastern United States may become more frequent in the future, and any  extreme shifts in climate condition are likely to have effects on wetland ecosystem function. USGS research predicts the effects of climate change by shifts in function and biodiversity across existing  climate gradients in baldcypress swamps. 

Date published: April 16, 2016
Status: Active

GIS and Custom Application Support for the Gulf Coast Ecosystem Restoration Council

 The scientists at the Wetland and Aquatic Science Center (WARC) have provided coastal restoration project managers and decision makers with GIS planning, database and custom application capacity since 1992. The scope and complexity of this support has increased over the years and has resulted in the development of a comprehensive geospatial and advanced application teams that provide decision...

Date published: April 11, 2016
Status: Active

Nonindigenous Aquatic Species (NAS) Program

Welcome to the Nonindigenous Aquatic Species (NAS) information resource for the United States Geological Survey. Located at Gainesville, Florida, this site has been established as a central repository for spatially referenced biogeographic accounts of introduced aquatic species. The program provides scientific reports, online/realtime queries, spatial data sets, distribution maps, and general...

Date published: April 8, 2016
Status: Active

Modeling Landscape-Scale Habitat Relations for Landbirds During Migration: Science Support for the Gulf Coast Joint Venture

USGS uses weather surveillance radar data and landscape-scale habitat metrics to model bird-habitat connections along the western coast of the Gulf of Mexico.

Date published: April 8, 2016
Status: Active

RESTORE Science: Inventory of Gulf of Mexico Ecosystem Indicators Using an Ecological Resilience Framework

To effectively manage an ecosystem, resource managers need a way to evaluate its health and ability to function. Metrics that indicate ecosystem condition - or indicators - can be used to help determine how well management strategies work. 

Date published: June 13, 2015
Status: Active

Transboundary Aquifer Assessment Program (TAAP)

Transboundary aquifers are an essential source of water for United States – Mexico border communities. Declining water levels, deteriorating water quality, and increasing use of groundwater resources on both sides of the border raise concerns about the long-term availability of this supply.

The U.S. – Mexico Transboundary Aquifer Assessment Act (Public Law 109-448) of 2006 was enacted...

Date published: June 21, 2009
Status: Completed

NAWQA High Plains Regional Groundwater Study

As part of the National Water Quality Assessment Program (NAWQA), the USGS has evaluated ground-water quality in the High Plains aquifer system. Beginning in 1999 and continuing for a period of 6 years, the High Plains Regional Groundwater Study intensively investigated the...

Date published: August 8, 2003
Status: Completed

Texas Source-Water Susceptibility Assessment

In the State of Texas, both surface water (streams, canals, and reservoirs) and ground water are used as sources of public water supply (PWS). Surface water sources of public water supply are susceptible to contamination from point and nonpoint sources. To help protect sources of drinking water and to help develop protective yet cost-effective and risk-mitigated monitoring strategies, the...

Filter Total Items: 1,608
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Year Published: 2015

Soil respiration patterns and controls in limestone cedar glades

Aims Drivers of soil respiration (Rs) in rock outcrop ecosystems remain poorly understood. We investigated these drivers in limestone cedar glades, known for their concentrations of endemic plant species and for seasonal hydrologic extremes (xeric and saturated conditions), and compared our findings to those in temperate grasslands and semi-arid...

Cartwright, Jennifer M.; Hui, Dafeng
Cartwright, J.M., and Hui, D., 2015, Soil respiration patterns and controls in limestone cedar glades: Plant and Soil, v. 389, no. 1-2, p.157-169.

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Year Published: 2015

Using stable isotopes of carbon to investigate the seasonal variation of carbon transfer in a northwestern Arkansas cave

Stable-isotope analyses are valuable in karst settings, where characterizing biogeochemical cycling of carbon along groundwater flow paths is critical for understanding and protecting sensitive cave and karst water resources. This study quantified the seasonal changes in concentration and isotopic composition (δ13C) of aqueous and gaseous...

Knierim, Katherine J.; Pollock, Erik; Hays, Phillip D.; Khojasteh, Jam

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Year Published: 2015

Dry season mean monthly flow and harmonic mean flow regression equations for selected ungaged basins in Arkansas

The U.S. Geological Survey, in cooperation with the Arkansas Department of Environmental Quality, Southwestern Energy, the Arkansas Natural Resources Commission, and the Arkansas Game and Fish Commission, developed regression equations for estimation of dry season mean monthly flows and harmonic mean flows that are representative of natural...

Breaker, Brian K.
Breaker, B.K., 2015, Dry season mean monthly flow and harmonic mean flow regression equations for selected ungaged basins in Arkansas: U.S. Geological Survey Scientific Investigations Report 2015–5031, 25 p., http://dx.doi.org/10.3133/sir20155031.

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Year Published: 2015

Bibliography for acid-rock drainage and selected acid-mine drainage issues related to acid-rock drainage from transportation activities

Acid-rock drainage occurs through the interaction of rainfall on pyrite-bearing formations. When pyrite (FeS2) is exposed to oxygen and water in mine workings or roadcuts, the mineral decomposes and sulfur may react to form sulfuric acid, which often results in environmental problems and potential damage to the transportation infrastructure. The...

Bradley, Michael W.; Worland, Scott C.

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Year Published: 2015

Water resources of St. John the Baptist Parish, Louisiana

Information concerning the availability, use, and quality of water in St. John the Baptist Parish, Louisiana, is critical for proper water-supply management. The purpose of this fact sheet is to present information that can be used by water managers, parish residents, and others for stewardship of this vital resource. Information on the...

White, Vincent E.; Prakken, Lawrence B.; Fendick, Robert B.

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Year Published: 2015

Potentiometric surface, 2013, and water-level differences, 1991-2013, of the Carrizo-Wilcox aquifer in northwest Louisiana

The Carrizo-Wilcox aquifer is the primary source of fresh groundwater for public supply as well as industrial, agricultural, and domestic uses in several parishes in northwestern Louisiana, including Bienville, Bossier, Caddo, De Soto, Natchitoches, Red River, Sabine, and Webster. In 2010, about 19 million gallons per day (Mgal/d) were withdrawn...

Fendick, Robert B.; Carter, Kayla
Fendick, R.B., Jr., and Carter, Kayla, 2015, Potentiometric surface, 2013, and water-level differences, 1991–2013, of the Carrizo-Wilcox aquifer in northwest Louisiana: U.S. Geological Survey Scientific Investigations Map 3311, 1 sheet, http://dx.doi.org/10.3133/sim3311.

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Year Published: 2015

Water resources of St. Charles Parish, Louisiana

Information concerning the availability, use, and quality of water in St. Charles Parish, Louisiana, is critical for proper water-supply management. The purpose of this fact sheet is to present information that can be used by water managers, parish residents, and others for stewardship of this vital resource. Information on the availability, past...

White, Vincent E.; Prakken, Lawrence B.
White, V.E., and Prakken, L.B., 2015, Water resources of St. Charles Parish, Louisiana: U.S. Geological Survey Fact Sheet 2014–3118, 6 p., http://dx.doi.org/10.3133/fs20143118.

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Year Published: 2015

Water resources of La Salle Parish, Louisiana

Information concerning the availability, use, and quality of water in La Salle Parish, Louisiana, is critical for proper water-supply management. The purpose of this fact sheet is to present information that can be used by water managers, parish residents, and others for stewardship of this vital resource. Information on the availability, past and...

White, Vincent E.; Prakken, Lawrence B.
White, V.E., and Prakken, L.B., 2015, Water resources of La Salle Parish, Louisiana: U.S. Geological Survey Fact Sheet 2014–3089, 6 p., http://dx.doi.org/10.3133/fs20143089.

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Year Published: 2015

Potentiometric surfaces and water-level trends in the Cockfield (upper Claiborne) aquifer in southern Arkansas and the Wilcox (lower Wilcox) aquifer of northeastern and southern Arkansas, 2012

The Cockfield aquifer, located in southern Arkansas, is composed of Eocene-age sand beds found near the base of the Cockfield Formation of Claiborne Group. The Wilcox aquifer, located in northeastern and southern Arkansas, is composed of Paleocene-age sand beds found in the middle to lower part of the Wilcox Group. The Cockfield and Wilcox...

Rodgers, Kirk D.

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Year Published: 2015

Lithologic and hydrologic controls of mixed alluvial-bedrock channels in flood-prone fluvial systems: bankfull and macrochannels in the Llano River watershed, central Texas, USA

The rural and unregulated Llano River watershed located in central Texas, USA, has a highly variable flow regime and a wide range of instantaneous peak flows. Abrupt transitions in surface lithology exist along the main-stem channel course. Both of these characteristics afford an opportunity to examine hydrologic, lithologic, and sedimentary...

Heitmuller, Frank T.; Hudson, Paul F.; Asquith, William H.
Franklin T. Heitmuller, Paul F. Hudson, William H. Asquith, Lithologic and hydrologic controls of mixed alluvial–bedrock channels in flood-prone fluvial systems: Bankfull and macrochannels in the Llano River watershed, central Texas, USA, Geomorphology, Available online 24 December 2014, ISSN 0169-555X, http://dx.doi.org/10.1016/j.geomorph.2014.12.033. (http://www.sciencedirect.com/science/article/pii/S0169555X14006370)

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Year Published: 2015

Simulations of potential future conditions in the cache critical groundwater area, Arkansas

A three-dimensional finite-difference model for part of the Mississippi River Valley alluvial aquifer in the Cache Critical Groundwater Area of eastern Arkansas was constructed to simulate potential future conditions of groundwater flow. The objectives of this study were to test different pilot point distributions to find reasonable estimates of...

Rashid, Haveen M.; Clark, Brian R.; Mahdi, Hanan H.; Rifai, Hanadi S.; Al-Shukri, Haydar J.

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Year Published: 2015

Soil ecology of a rock outcrop ecosystem: Abiotic stresses, soil respiration, and microbial community profiles in limestone cedar glades

Limestone cedar glades are a type of rock outcrop ecosystem characterized by shallow soil and extreme hydrologic conditions—seasonally ranging from xeric to saturated—that support a number of plant species of conservation concern. Although a rich botanical literature exists on cedar glades, soil biochemical processes and the ecology of soil...

Cartwright, Jennifer M.; Advised by Dzantor, E. Kudjo
Cartwright, Jennifer M. Soil ecology of a rock outcrop ecosystem: Abiotic stresses, soil respiration, and microbial community profiles in limestone cedar glades. PhD. Dissertation. Tennessee State University, 2014.

Filter Total Items: 265
Image shows a drill core in a box with cardboard dividers
September 12, 2015

Eagle Ford Drill Core

A drill core from near Waco, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc.

The USGS assesses undiscovered, technically recoverable oil and gas resources for the onshore United

...
Image shows a drill core in a box with cardboard dividers
September 12, 2015

Eagle Ford Drill Core

A drill core from near Waco, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc.

The USGS assesses undiscovered, technically recoverable oil and gas resources for the onshore United

...
Image shows a cross-section of a drill core, held in two gloved hands
September 12, 2015

Eagle Ford Drill Core

A drill core from near Waco, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc.

The USGS assesses undiscovered, technically recoverable oil and gas resources for the onshore United

...
Location is about 11 miles downstream from Farm to Market Road 669 bridge over Double Mountain Fork Brazos River.
August 4, 2015

11 miles from FM 669 bridge Double Mt. Fork Brazos River

Location is about 11 miles downstream from Farm to Market Road 669 bridge over Double Mountain Fork Brazos River near Justiceburg, Texas, in Garza County.
USGS SIR 2016–5032

Location is about 3 miles downstream from U.S. Highway 84 bridge over Double Mountain Fork Brazos River near Justiceburg, Texas.
August 4, 2015

U.S. Highway 84 bridge over Double Mountain Fork Brazos River

Location is about 3 miles downstream from U.S. Highway 84 bridge over Double Mountain Fork Brazos River near Justiceburg, Texas, in Garza County.
USGS SIR 2016–5032

5 miles downstream from Farm to Market Road 669 bridge over Double Mountain Fork Brazos River near Justiceburg, Texas.
August 4, 2015

5 miles from FM Road 669 bridge Double Mt. Fork Brazos River

Location is about 5 miles downstream from Farm to Market Road 669 bridge over Double Mountain Fork Brazos River near Justiceburg, Texas, in Garza County.
USGS SIR 2016–5032

miles downstream from Farm to Market Road 669 bridge over Double Mountain Fork Brazos River, Justiceburg, Texas, Garza County.
August 4, 2015

FM 669 bridge over Double Mountain Fork Brazos River

Location is about 9 miles downstream from Farm to Market Road 669 bridge over Double Mountain Fork Brazos River near Justiceburg, Texas, in Garza County.
USGS SIR 2016–5032

Location is about 8 miles downstream from Farm to Market Road 669 bridge over Double Mountain Fork Brazos River near Justiceburg
August 4, 2015

FM 669 bridge over Double Mountain Fork Brazos River

Location is about 8 miles downstream from Farm to Market Road 669 bridge over Double Mountain Fork Brazos River near Justiceburg, Texas, in Garza County.
USGS SIR 2016–5032

Two men collecting groundwater samples at a public well in the middle of a grassy field in Texas
July 28, 2015

Scientists Sampling Groundwater from a Public Supply Well in Texas

USGS scientists collecting water quality samples at a public-supply well in Texas, overlying the Eagle Ford shale production area.

Image: Memorial Day Flood in Texas
May 31, 2015

Memorial Day Flood in Texas

Road and bridge damage on the Blanco River near Blanco, Texas, from the Memorial Day 2015 Flood.

May 24, 2015

Texas Flood Surveys

Hydrologists from Arizona aid the Texas Water Science Center in gathering measurements and other information after the catastrophic Blanco River flooding event that swept Austin, Texas.

Filter Total Items: 175
USGS science for a changing world logo
July 16, 2009

Water produced by the High Plains aquifer, which provides water to eight states, is generally acceptable for human consumption, irrigation, and livestock watering, according to a U.S. Geological Survey study highlighted at the summer meeting of the Western States Water Council in Park City, Utah.

USGS science for a changing world logo
June 16, 2009

Spring nutrient delivery to the northern Gulf of Mexico is among the highest measured by the U.S. Geological Survey (USGS) in thirty years. Too many nutrients, which are essential for plant growth, are not necessarily a good thing.

USGS science for a changing world logo
April 8, 2009

USGS Shares Findings and Lessons from Ike at the 2009 National Hurricane Conference in Austin
The 2008 hurricane season made its mark on the northern Gulf of Mexico coastline by leaving it more vulnerable to future storms.

USGS science for a changing world logo
March 18, 2009

On Nov. 1, 1933, Mrs. Bruce Reid recorded seeing both a male and female ivory-billed woodpecker in Texas. And on May 28, 1938, Oscar McKinley Bryans observed a ruby-throated hummingbird in Michigan, noting that the birds were most common when apple trees were blooming. These are just two of more than 6 million personal observations scribbled and preserved on notecards in government files.

USGS
October 6, 2008

 

What: Reporters are invited to attend a special presentation about the impacts of Hurricanes Ike and Gustav on the Texas and Louisiana coast. Compelling before-and-after photographs of the storms will be

USGS
October 6, 2008

Top scientists from across the world, including 192 earth science experts from the U.S. Geological Survey (USGS), will be gathering this week to share their latest findings and most innovative research. 

USGS
September 23, 2008

Before-and-after Hurricane Ike photographs showing the near total destruction of a coastal neighborhood in Texas are now accessible online.

USGS
September 12, 2008

New maps that help forecast possible impacts and damages to coastal communities from Hurricane Ike can be accessed online.http://coastal.er.usgs.gov/hurricanes/ike/ .

USGS
August 28, 2008

U.S. Geological Survey (USGS) scientists will be installing rapidly-deployable mobile gages and storm-surge sensors to prepare for Tropical Storm Gustav.