Assessing age of groundwater to determine resource availability
Groundwater discharge that flows into the Upper Colorado River Basin varies in response to drought, which is likely due to aquifer systems that contain relatively young groundwater, according to a new U.S. Geological Survey study published in Hydrogeology Journal.
Spring sampling location along Little Sandy River in southern Wyoming. Groundwater discharge that flows into the Upper Colorado River Basin varies in response to drought, which is likely due to aquifer systems that contain relatively young groundwater, according to a new US Geological Survey study.
The Colorado River and its tributaries provide water to more than 40 million people in seven states, irrigate more than 5.5 million acres of land, and support hydropower facilities. More than half of the total streamflow in the UCRB originates from groundwater. Reductions in groundwater recharge associated with climate variability or increased water demand will likely reduce groundwater discharge to streams.
This is the first study that examines the short-term response of groundwater systems to climate stresses at a regional scale by assessing groundwater age. USGS scientists determined the age of groundwater by sampling the water flowing from nineteen springs in the UCRB.
Age-tracing techniques can assess how long it takes groundwater to travel from the time it enters the aquifer system as precipitation to when the groundwater exits to springs and streams. Scientists compared eight of the springs with historical discharge and precipitation records with the groundwater age to better understand how aquifers have responded to drought. These findings helped scientists understand the variability and timing of groundwater discharge associated with drought.
"About half of the springs analyzed in the Upper Colorado River Basin contained young groundwater, which was surprising," said USGS scientist and lead author of the study John Solder. "These findings suggest that shallow aquifers, which are more responsive to drought than deeper systems, may be significant contributors to streamflow in the region."
Results show that if springs contain mostly older water, groundwater discharge is less variable over time and takes longer to respond to drought conditions. Springs that contain predominately young water, around 80 years old or less, are more likely to vary seasonally and respond rapidly to drought conditions. These results indicate that young groundwater resources are responsive to short-term climate variability.
"Sampling 19 springs in a very large basin is just the start, and further studies are needed to better understand the groundwater resources of this specific region," said Solder. "Determining groundwater age has promise in predicting how these systems will respond in the future and allows us to assess resource vulnerability where no historical records are available."
This study was funded by the USGS National Water Census, a research program focusing on national water availability and use at the regional and national scales. Research is designed to build decision support capacity for water management agencies and other natural resource managers.
Jennifer LaVista | EurekAlert!
NASA sees quick development of Hurricane Dora
27.06.2017 | NASA/Goddard Space Flight Center
Collapse of the European ice sheet caused chaos
27.06.2017 | CAGE - Center for Arctic Gas Hydrate, Climate and Environment
An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
19.06.2017 | Event News
13.06.2017 | Event News
13.06.2017 | Event News
27.06.2017 | Power and Electrical Engineering
27.06.2017 | Information Technology
27.06.2017 | Physics and Astronomy