Cian Dawson
Cian Dawson is a hydrologist with the Hydrogeophysics Branch of the USGS Water Resources Mission Area Earth System Processes Division.
Science and Products
Integration of sUAS into Hydrogeophysical Studies
The USGS is evaluating the integration of small unoccupied aircraft systems – sUAS or "drones" – into USGS hydrogeophysical studies.
Integration of sUAS into Hydrogeophysical Studies: Technology Demonstration and Evaluation
The USGS is evaluating the integration of small unoccupied aircraft systems – sUAS or "drones" – into USGS hydrogeophysical studies. The following projects are part of a Water Resources Mission Area demonstration and evaluation effort in collaboration with USGS Water Science Centers (WSCs) starting in June 2018.
Handheld Thermal Imaging Cameras for Groundwater/Surface-Water Interaction Studies
USGS scientists are using high-resolution handheld thermal imaging cameras in groundwater/surface-water interaction studies and other investigations. These cameras are used to quickly locate and characterize thermal anomalies in streams, lakes, and adjacent structures. Variations in temperature can be used to track the heat carried by flowing water, such groundwater discharge into a stream....
Efficient hydrogeological characterization of remote stream corridors using drones
This project demonstrates the successful use of small unoccupied aircraft system (sUASs) for hydrogeological characterization of a remote stream reach in a rugged mountain terrain. Thermal infrared, visual imagery, and derived digital surface models are used to inform conceptual models of groundwater/surface‐water exchange and efficiently...
Briggs, Martin A.; Dawson, Cian B.; Holmquist-Johnson, Christopher; Williams, Kenneth H.; Lane, John W.
Use of discrete-zone monitoring systems for hydraulic characterization of a fractured-rock aquifer at the University of Connecticut Landfill, Storrs, Connecticut, 1999 to 2002
The U.S. Geological Survey, in cooperation with the University of Connecticut, used a suite of hydraulic methods to characterize the hydrogeology of a fractured-rock aquifer near the former landfill and chemical-waste disposal pits at the University of Connecticut, Storrs, Connecticut. Multiple methods were used to determine head, driving...
Johnson, Carole D.; Kochiss, Christopher S.; Dawson, C.B.
An integrated surface-geophysical investigation of the University of Connecticut landfill, Storrs, Connecticut, 2000
A surface-geophysical investigation to characterize the hydrogeology and contaminant distribution of the former landfill area at the University of Connecticut in Storrs, Connecticut, was conducted in 2000 to supplement the preliminary hydrogeologic assessment of the contamination of soil, surface water, and ground water at the site. A geophysical-...
Johnson, Carole D.; Dawson, C.B.; Belaval, Marcel; Lane, John W.
USGS Scenario Evaluator for Electrical Resistivity Survey Design Tool
This video provides an overvew of the USGS Scenario Evaluator for Electrical Resistivity (SEER).
Today’s environmental site managers have many tools to choose from when conducting site characterization and remediation. Geophysical tools can provide noninvasive ways to see inside the earth, much like how medical imaging lets us see inside the human body. The USGS
Borehole Nuclear Magnetic Resonance for Environmental Site Management
Borehole nuclear magnetic resonance (NMR) is an emerging geophysical method being applied to hydrogeology investigations. NMR is a quantitative geophysical method that can be used to make in situ assessments of porosity, water content, mobile and immobile water fraction, and estimates of permeability. While borehole NMR is commonly used in the oil and gas industry, it is
USGS Fractured Rock Geophysical Toolbox Method Selection Tool
This video provides an overview of the USGS Fractured Rock Geophysical Toolbox Method Selection Tool. The Fractured Rock Geophysical Toolbox Method Selection Tool (FRGT-MST) is an Excel-based tool for identification of geophysical methods most likely to be appropriate for project goals and site conditions. We envision the FRGT-MST: 1) equipping remediation professionals
USGS Geophysical Field Experience 2015
USGS Geophysical Field Experience 2015 - Learn about recent hands-on hydrogeophysics field training for USGS interns and scientists.