Publications
Publications
Here you will find publications, reports and articles produced by Lower Mississippi-Gulf scientists. For a comprehensive listing of all USGS publications please click the button below.
Filter Total Items: 419
Magnitude and frequency of floods in Alabama, 2015
To improve flood-frequency estimates at rural streams in Alabama, annual exceedance probability flows at gaged locations and regional regression equations used to estimate annual exceedance probability flows at ungaged locations were developed by using current geospatial data, new analytical methods, and annual peak-flow data through September 2015 at 242 streamgages in Alabama and surrounding Sta
Authors
Brandon T. Anderson
A within-season approach for detecting early crop stage of corn and soybean using high temporal and spatial resolution imagery
Crop emergence is a critical stage for crop development and crop growth modeling. Mapping crop emergence using remote sensing data is challenging. Previous remote sensing phenology algorithms showed that crop stages could be detected around the V3-V4 (3 to 4 established leaves) vegetative stage. Traditional approaches have a strong assumption regarding the temporal evolution of plant growth and no
Authors
Feng Gao, Martha Anderson, Craig S. T. Daughtry, Arnon Karnieli, W. Dean Hively, William P. Kustas
Water resources of Union Parish, Louisiana
Information concerning the availability, use, and quality of water in Union 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. In 2014, about 4.88 million gallons per day (Mgal/d) of water were withdrawn in Union Parish: 4
Authors
Angela L. Robinson
Changing suspended sediment in United States rivers and streams: Linking sediment trends to changes in land use/cover, hydrology and climate
Sediment is one of the leading pollutants in rivers and streams across the United States (US) and the world. Between 1992 and 2012, concentrations of annual mean suspended sediment decreased at over half of the 137 stream sites assessed across the contiguous US. Increases occurred at less than 25 % of the sites, and the direction of change was uncertain at the remaining 25 %. Sediment trends were
Authors
Jennifer C. Murphy
Assessing water-quality changes in agricultural drainages: Examples from oxbow lake tributaries in Mississippi, USA and simulation-based power analyses
Hydrology and water quality (suspended sediment, total nitrogen, ammonia, total Kjeldahl nitrogen, nitrate plus nitrite, and total phosphorus (TP)) were monitored in two small agricultural drainages in northwestern Mississippi to document changes in water quality that coincided with the implementation of BMPs in upstream drainages. Using an event-based dataset and bootstrapping techniques, we test
Authors
Jennifer C. Murphy, Matthew B. Hicks, Shane J. Stocks
Simulation of water-management scenarios for the Mississippi Delta
To compare the effectiveness of proposed alternative water-supply scenarios on future water availability in the Mississippi Delta, the U.S. Geological Survey and the Mississippi Department of Environmental Quality are collaborating on the update and enhancement of an existing regional groundwater-flow model of the area. Through this collaboration, the model has been updated to include boundary con
Authors
Connor J. Haugh, Courtney D. Killian, Jeannie R. B. Barlow
Soil shear strength losses in two fresh marshes with variable increases in N and P loading
We measured soil shear strength (SSS) from 2009 to 2018 in two hydrologically distinct freshwater marshes dominated by Panicum hemitomon after nitrogen (N) and phosphorous (P) were applied to the surface in spring. The average SSS averaged over 100 cm depth in the floating and anchored marshes declined up to 30% throughout the profiles and with no apparent differences in the effects of the low, me
Authors
R. Eugene Turner, Christopher M. Swarzenski, James E. Bodker
The use of support vectors from support vector machines for hydrometeorologic monitoring network analyses
Hydrometeorologic monitoring networks are ubiquitous in contemporary earth-system science. Network stakeholders often inquire about the importance of sites and their locations when discussing funding and monitoring design. Support vector machines (SVMs) can be useful by their assigning each monitoring site as either a support or nonsupport vector. A potentiometric surface was created from syntheti
Authors
William H. Asquith
Fluxes of agricultural nitrogen and metolachlor metabolites are highly correlated in a first order stream in Maryland, USA
Nitrogen pollution in watersheds containing significant
cropland area is generally problematic. Conservation practices intended
to reduce nitrate-N (NO3--N) export from watersheds are being implemented
by many regions without necessary tools to assess effectiveness of these
abatement tools. A commonly used herbicide metolachlor degrades in the
vadose zone of croplands to form two metabolites (meto
Authors
Cliff Rice, W. Dean Hively, Gregory W. McCarty, Cathleen Hapeman
Mapping climate change resistant vernal pools in the northeastern U.S.
Vernal pools are seasonal wetlands that provide important breeding habitat for a variety of amphibian species. As future climate projections indicate warmer growing seasons and earlier seasonal increases in evapotranspiration, some managers of vernal pools have expressed concern that pools may dry earlier in the season, potentially interfering with completion of amphibian life cycles. In this cont
Authors
Jennifer M. Cartwright, Evan H. Campbell Grant
Council monitoring and assessment program (CMAP) compilation of existing habitat and water quality monitoring and mapping assessments for the Gulf of Mexico Region
This report is a deliverable to the RESTORE Council for Task 7: Document the existing baseline habitat and water quality conditions prior to implementation of the restoration projects; these baseline conditions will serve as a basis for measuring change/progress after restoration. It is the second in a series of CMAP reports. The first report describes the process and development of the CMAP monit
Authors
Julie Bosch, Heidi Burkart, Bogdan Chivoiu, Randy Clark, Chris Clement, Nicholas Enwright, Steve Giordano, Chris Jeffrey, Ed Johnson, Rheannon M. Hart, Sarah Davidson Hile, Jacob Howell, Claudia Laurenzano, Michael T. Lee, Terrence A. McCloskey, Terry McTigue, Michelle B. Meyers, Scott V. Mize, Mark E. Monaco, Kevin Owen, Richard A. Rebich, Samuel H. Rendon, Ali Robertson, Thomas Sample, Gregory D. Steyer, Kevin J. Suir, Christopher M. Swarzenski, Katie Watson
Simulation of groundwater flow and chloride transport in the “1,500-foot” sand, “2,400-foot” sand, and “2,800-foot” sand of the Baton Rouge area, Louisiana
Groundwater withdrawals since the 1940s have lowered water levels, altered groundwater-flow directions, and caused saltwater to intrude within some freshwater-containing sands of the fluvial-deltaic Southern Hills regional aquifer system beneath Baton Rouge, Louisiana. New interpretations of stratigraphic correlations amongst geophysical well logs were utilized to revise a hydrogeologic framework
Authors
Charles E. Heywood, Maxwell A. Lindaman, John K. Lovelace