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: 463
Assessing water-quality changes in agricultural drainages: Examples from oxbow lake tributaries in Mississippi, USA and simulation-based power analyses 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...
Authors
Jennifer C. Murphy, Matthew B. Hicks, Shane J. Stocks
Simulation of water-management scenarios for the Mississippi Delta 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...
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 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...
Authors
R. Eugene Turner, Christopher M. Swarzenski, James E. Bodker
The use of support vectors from support vector machines for hydrometeorologic monitoring network analyses 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...
Authors
William H. Asquith
Fluxes of agricultural nitrogen and metolachlor metabolites are highly correlated in a first order stream in Maryland, USA 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...
Authors
Cliff Rice, W. Dean Hively, Gregory W. McCarty, Cathleen Hapeman
Mapping climate change resistant vernal pools in the northeastern U.S. 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...
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 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...
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 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...
Authors
Charles E. Heywood, Maxwell A. Lindaman, John K. Lovelace
Phosphorus runoff risk assessment in karstic regions of the U.S. Phosphorus runoff risk assessment in karstic regions of the U.S.
The Phosphorus (P) Index risk assessment tool has been widely adopted across the U.S. to identify and rank site vulnerability to P runoff as part of the Natural Resources Conservation Service (NRCS) nutrient management planning (NMP) process. However, limited success has been achieved in addressing the risk of P loss by subsurface flow pathways, despite its relative importance in certain...
Authors
Andrew N. Sharpley, Phillip D. Hays, Michael B. Daniels, Karl W. VanDevender
A comparison of hydrocarbon-related landscape disturbance patterns along the New York-Pennsylvania border, 2004–2013 A comparison of hydrocarbon-related landscape disturbance patterns along the New York-Pennsylvania border, 2004–2013
Executive Summary The New York-Pennsylvania area has a long history of hydrocarbon extraction, and the addition of shale gas extraction methods contributes to landscape disturbance borne by previously developed oil and non-shale gas resources. The main unconventional extraction method used to extract shale gas from the Marcellus Shale located in New York and Pennsylvania is hydraulic...
Authors
Coral M. Howe, Lesley E. Milheim, E. Terrence Slonecker, Siddiq Kalaly, Joseph Chestnut
Flood-frequency comparison from 1995 to 2016 and trends in peak streamflow in Arkansas, water years 1930–2016 Flood-frequency comparison from 1995 to 2016 and trends in peak streamflow in Arkansas, water years 1930–2016
In 2016, the U.S. Geological Survey, in cooperation with the U.S. Army Corps of Engineers and the Federal Emergency Management Agency, began a study in Arkansas to investigate possible increasing trends in annual peak streamflow data and the possible resulting increase in the annual exceedance probability flood (AEPF) predictions. Temporal trends of peak streamflow were investigated at...
Authors
Paul A. Ensminger, Brian K. Breaker
Copula theory as a generalized framework for flow-duration curve-based streamflow estimates in ungaged and partially gaged catchments Copula theory as a generalized framework for flow-duration curve-based streamflow estimates in ungaged and partially gaged catchments
Flow‐duration curve (FDC) based streamflow estimation methods involve estimating an FDC at an ungaged or partially gaged location and using the time series of nonexceedance probabilities estimated from donor streamgage sites to generate estimates of streamflow. We develop a mathematical framework to illustrate the connection between copulas and prior FDC‐based approaches. The performance...
Authors
Scott C. Worland, Scott Steinschneider, William H. Farmer, William H. Asquith, Rodney Knight