Andy Long has more than 25 years of experience assessing groundwater flow and transport through numerical modeling, analyzing ambient and injected tracers, and geophysical methods.
Professional Experience
Groundwater Specialist, USGS Washington Water Science Center (July 2015 – present) - I advise and train staff scientists and technicians on technical issues, including interpretive studies and the collection, management, and archival of data. I advise managers of the science center in building and guiding the overall groundwater studies and data programs. I conduct scientific investigations involv
Chair and Vice Chair, Washington Hydrogeology Symposium (2017 – present) – http://depts.washington.edu/uwconf/wordpress/wahgs/
Research Hydrologist, USGS Dakota Water Science Center (DWSC; 2009 – 2015) –
Developed innovative methods to better understand, quantify, and test hypotheses related to groundwater flow and transport in karst aquifers. Topics include groundwater age dating, lumped-parameter models, aquifer classification, hydrochemical evaluation, heat transport, and groundwater recharge.
Adjunct Assistant Professor, South Dakota School of Mines and Technology (SDSMT; Oct 2005 – 2018) –
Served on eight graduate advisory committees for M.S. and Ph.D. students and gave numerous guest lectures.
Hydrologist, USGS DWSC (Jan 1999 – Oct 2009) –
This involved numerical modeling of groundwater flow and solute transport, dye tracing experiments in karst aquifers, aquifer pumping tests, and development of new research models.
Consultant (1994–1998) –
Conducted GIS analysis and groundwater modeling with MODFLOW related to a proposed low-level nuclear-waste site for the Boyd County Monitoring Committee in Nebraska. Consulted for Terra Nitrogen in Sergeant Bluff, Iowa and simulated groundwater flow and transport with MODFLOW, MOC, and GIS analysis to assess the movement of ammonia contamination.
Research assistant, SDSMT (1995–1998) –
Developed and wrote the FORTRAN computer code for a three-dimensional groundwater model to simulate dual-porosity flow in karst aquifers. Collaborated with a team of researchers on the design of a numerical model to simulate surface-water and groundwater flow, dynamically linked to atmospheric processes.
Hydrologist, Rapid City Water Department (1994-1995) –
Collaborated with the USGS to simulated groundwater flow in karst aquifers.
Science and Products
Williston and Powder River Basins Groundwater Availability Study
Keyport Groundwater Model
Yakima River Basin
Groundwater Flow, Quality, and Mixing in the Wind Cave National Park Area, South Dakota
RRAWFLOW: Rainfall-Response Aquifer and Watershed Flow Model
Walla Walla Groundwater
Assess the utility of a regional aquifer system groundwater model to inform the USGS National Hydrologic Model
Hydrochemical Analysis of Groundwater in Jewel Cave National Monument
Science and Products
- Science
Williston and Powder River Basins Groundwater Availability Study
The development of two nationally important energy-producing areas, the Williston structural basin (containing the Bakken Formation) and Powder River structural basin, provide a critical opportunity to study the water-energy nexus within a groundwater context. Large volumes of water are needed for energy development in these basins. The hydraulically connected aquifers in the regional glacial...Keyport Groundwater Model
The Issue: Chlorinated volatile organic compounds have impacted groundwater beneath a former 9-acre landfill at OU 1 of the Naval Base Kitsap Keyport, Washington. The landfill is adjacent to tidal flats that are an extension of Liberty and Dogfish Bays and was the primary disposal area for domestic and industrial waste generated by NBK Keyport from the 1930s through 1973.The Navy needs a detailed...Yakima River Basin
The Yakima River flows 215 miles from the outlet of Keechelus Lake in the central Washington Cascades southeasterly to the Columbia River, draining an area of 6,155 square miles. The Yakima River Basin is one of the most intensively irrigated areas in the United States. Population in the Yakima River Basin was about 238,000 in 1990.Increasing demands for water for municipal, fisheries...Groundwater Flow, Quality, and Mixing in the Wind Cave National Park Area, South Dakota
Project Period: 2007-2010Cooperator: National Park ServiceProject Chief: Andrew LongRRAWFLOW: Rainfall-Response Aquifer and Watershed Flow Model
RRAWFLOW: Rainfall-Response Aquifer and Watershed Flow ModelWalla Walla Groundwater
The Issue: Within the states of Washington and Oregon, the 1,777 mi2 Walla Walla River Basin (WWRB) is a complex hydrogeologic system with long-term water-level declines in regional aquifers and insufficient instream flows required for threatened and culturally important fish populations. The public and state resource management agencies need an improved understanding of the WWRB hydrogeologic...Assess the utility of a regional aquifer system groundwater model to inform the USGS National Hydrologic Model
The Issue: In Washington State, groundwater (GW) inflow to streams, or baseflow, is essential for maintaining aquatic habitats, and for out-of-stream uses such as irrigated agriculture during the typically dry summers. However, the National Hydrologic Model (NHM) currently is most suited to predicting total daily streamflow. This project aims to assess the NHM’s performance in simulating baseflow...Hydrochemical Analysis of Groundwater in Jewel Cave National Monument
The Issue: The park’s landscape and geomorphology is characterized as a carbonate karst environment, with sinking streams and fast connections between surface water and groundwater, resulting in high vulnerability of contamination to groundwater. Now that subterranean lakes have been discovered in Jewel Cave, understanding the groundwater connection of the lakes therein to the lakes in nearby Wind... - Data
- Publications