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The mission of the water and environmental section is to gain a better understanding of the hydrologic systems of Louisiana, particularly through increased knowledge of the properties of the state's aquifers. Besides research into Louisiana aquifers - especially how they interact with each other and with the state's rivers, lakes, and wetlands - research is also performed into water quality and how natural and man made pollutants are distributed and move within the aquifers, as well as interactions with surface water bodies. The results of this research into the state's hydrologic systems allows the LGS to provide effective technical assistance/support to various stakeholders of Louisiana water resources, thus aiding in Louisiana's management of this valuable resource.

Water and Environmental Section Staff

Riley Milner , Research Associate 3

email: lmilne1@lsu.edu
Telephone: 225-578-3410

Riley Milner received a B.S. in Geology in 1985 at Louisiana State University. Following this he worked as a Research Associate 3 for the LSU Department of Geology and for International Technology as an Engineer/Scientist 4. He joined the LGS in 1998.

Milner's areas of expertise include environmental geology, Quaternary geology, geomorphology, subsurface stratigraphy and mapping, hydrology and water resources of Louisiana.


Recent Publications:

  • Milner, R. and T. Van Biersel, 2006, Updated geology and saltwater intrusion for the Chicot Aquifer of Southwestern Louisiana, Proceedings of the 25th Anniversary Meeting and International Conference, Challenge in Coastal Hydrology and Water Quality, p. 141-152.
  • Milner, R., 2006, Basement control of coastal surface morphology in southwest Louisiana, Gulf Coast Association of Geological Societies 2006 meeting, Lafayette, LA., p. 591-602.
  • Milner, R. and S. McLaughlin, 2004, Preliminary Geologic Characterization of the Chicot Aquifer in Southwest Louisiana-Acadia, Allen, Beauregard, Calcasieu, Evangeline, and Jefferson Davis Parishes: American Association of Petroleum Geologists, 97 p.
  • Carlson D. and R. Milner, 2004 Progress Report on the Chicot Aquifer Study: Louisiana Geological Survey, NewsInsight, v.14, no. 1, p.2-4.
  • Milner, R., 2004, A guide to the Rocks and Minerals of Louisiana: Louisiana Geological Survey, Education Series, no.3, 32 p.

Douglas Carlson , Assistant Professor - Research

email: dcarlson@lsu.edu
Telephone: 225-578-3671

Douglas Carlson received a B.S. in both Geology and Geophysics from the University of Minnesota Institute of Technology in 1981, an M.S. in Geophysics from the New Mexico Institute of Mining and Technology in 1983, and a Ph.D. in Geosciences with a minor in Water Resources Engineering from the University of Wisconsin-Milwaukee in 2001. Carlson worked Physics Lecturer at the University of Wisconsin-Stout, as a Physics Instructor at Ball State University, as Associate Lecturer and Lecturer at University of Wisconsin-Milwaukee, as Hydrologist for the U.S. Geological Survey, and Research Hydrogeologist at University of Wisconsin-Milwaukee. He joined the LGS in 2002. Carlson\'s areas of expertise include physical hydrogeology, groundwater modeling, groundwater surface water interactions, application of geophysical techniques to hydrogeologic studies, chemical hydrogeology and hydrology.

Recent Publications:

  • Carlson D., 2004, Underlying Aquifers Effect on Recharge Rates in Louisiana: Geological Society of America, Abstracts with Programs, V. 36, no. 5, p 131 [abstract].
  • Carlson D. and R. Milner, 2004, Hydrologic differences arising from source material differences between southwestern Louisiana aquifers and their age equivalents in southeastern Louisiana: Gulf Coast Association of Geological Societies Transactions, v.54, p.101-111.
  • Carlson D., Louisiana's Groundwater Resources: Louisiana Geological Survey Public Information Series, in press.
  • Carlson D., 2004, Sparta Progress Report for the first year of work: Louisiana Geological Survey, Gulf Coast Association of Geological Societies Transactions, V.53, v.14, no.2, p.6-9.
  • Carlson D., 2004, Louisiana Aquifer Characterizations, Aquifer Hydraulic Conductivities: Louisiana Geological Survey, NewsInsights, v.14, no.2, p.3-6.

Water and Environmental Section Projects


Project: Regional Groundwater Model Of Central Louisiana Aquifers

Principal Investigators (PI): Douglas Carlson

This modeling project will include three major aquifers in the central portion of Louisiana: Evangeline, Jasper and Catahoula Aquifers. Each of these aquifers is composed of interbedded layers of sand and clay. This project is in its very initial stage. Present work is a start on aquifer characterization to build a conceptual model of this aquifer which is necessary prior to the construction of the numerical groundwater model: the MODFLOW finite-difference model. Hydraulic conductivity values have been determined for about 550 wells which have had specific capacity tests completed. These results include over 70 values for each of the three major aquifers. Recharge rate has been determined from analysis of stream discharges for eight watersheds over the past 36 years, which includes about 180 individual years of discharge records.

Project: Regional Groundwater Model Of The Chicot Aquifer

PIs: Douglas Carlson, Riley Milner and Clint Willson (LSU Department of Civil Engineering)

This project involves characterization of the aquifer in order to build a conceptual model of it. The hydraulic conductivity of this aquifer has been determined for about 600 wells that have had specific capacity tests completed. Recharge rate has been determined from analysis of stream discharge for 18 watersheds over the past 36 years, which includes about 460 individual years of discharge records. In addition, work on the stratigraphy and porosity of these aquifers is nearing completion. Contacts between regionally significant sand and clay layers have been determined from examination of over 1000 geophysical logs. In the southeastern parishes there is top confining clay and clay between upper and lower portions of the Chicot Aquifer. In the southwest, Calcasieu and Cameron Parishes, there are three sands: 200 foot, 500 foot and 700 foot, plus clays above and between these sands. Currently about 3500 values of porosity have been determined from analysis of about 70 sonic, neutron and density logs throughout southwest Louisiana. In addition, work on relating hydraulic conductivity to sand textures within a large scope of depositional sources has begun. All of this hydrogeologic information is being incorporated in both regional and parish size models of the Chicot Aquifer.

Project: Regional Groundwater Model Of The Mississippi Alluvial Aquifer

PI: Douglas Carlson

This project is in its very initial stage. Present work is a start on aquifer characterization to build a conceptual model of this aquifer which is necessary prior to the construction of the numerical groundwater model: the MODFLOW finite difference model. The hydraulic conductivity of this aquifer has been determined for about 440 wells that have had specific capacity tests completed. Recharge rate has been determined from analysis of stream discharges for six watersheds over the past 36 years, which includes about 200 individual years of discharge records.

Project: Regional Groundwater Model Of The Southern Hills Aquifer System

PI: Thomas Van Biersel

This modeling project will include the three major aquifer systems in the southern hills regions of southeastern Louisiana: the Chicot Equivalent, Evangeline Equivalent and Jasper Equivalent aquifer systems. Each of these aquifers systems are composed of several sand and clay layers. This project is in its very initial stage. Present work is a start on aquifer characterization to build a conceptual model of this aquifer which is necessary prior to the construction of the numerical groundwater model: the MODFLOW finite difference model. Hydraulic conductivity values have been determined for about 550 wells which have had specific capacity tests completed. These results include over 100 values for each of the three major aquifer systems. Recharge rate has been determined from analysis of stream discharges for 14 watersheds over the past 36 years, which includes about 425 individual years of discharge records.

Project: Regional Groundwater Model Of The Sparta Aquifer System

PI: Douglas Carlson; Co-PI's: Thomas Van Biersel, Riley Milner

This modeling project involves three major aquifers in the northwest to north central portion of Louisiana: Cockfield, Sparta and Carrizo-Wilcox Aquifers. Each of these aquifers is composed of interbedded layers of sand and clay. This project is in its initial stage. Present work is a start on aquifer characterization to build a conceptual model of this aquifer which is necessary prior to the construction of the numerical groundwater model: the MODFLOW finite difference model. Hydraulic conductivity values have been determined for about 1100 wells which have had specific capacity tests completed. These results include over 125 values for each of the three major aquifers. Recharge rate has been determined from analysis of stream discharges for 25 watersheds over the past 36 years, which includes about 500 individual years of discharge records. In addition, initial work on the stratigraphy and porosity of these aquifers has been completed. Contacts between major aquifers and aquitards have been determined in this initial examination of about 3150 geophysical logs. This includes five contacts that have been located in over 1000s geophysical logs: Sparta-Cane River contact (2169), Cane River-Carrizo-Wilcox contact (2025), Carrizo-Wilcox - Midway (1758), Cook Mountain-Sparta (1749), and Cockfield-Cook Mountain (1382). Currently about 3700 values of porosity have been determined from analysis of about 40 sonic logs throughout northern Louisiana. These results include about 1500 values of porosity for both Sparta and Carrizo-Wilcox aquifers.

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