Wednesday, April 2, 2008 : 8:20 a.m.

Assessing Global Ground-Water Resources under the Pressures of Climate Change and Linked Human Activities

Jason J. Gurdak, U.S. Geological Survey, Makoto Taniguchi, Research Institute for Humanity and Nature; GRAPHIC, Jose Luis Martin, UNESCO - Division of Water Sciences, Timothy R. Green, USDA, Agricultural Research Service, Henk Kooi, Vrije Universiteit, Kevin Hiscock, University of East Anglia, Richard G. Taylor, University College London and Breton W. Bruce, US Geological Survey

Ground water is critically important for sustaining global fresh water resources on local to national scales, particularly in developing countries. Sustainable ground-water management practices can improve fresh-water supplies.  The use of ground water in developing countries can help to balance large variations in the distribution and magnitude of precipitation as a result of climate variability and change and increasing human demands on surface-water supplies.  However, many ground-water resources are not managed using sustainable practices and thus face unprecedented pressures from the combined effects of climate change and human activities.   Complicating the necessary assessment of ground-water resources are the inherent challenges involved with evaluating subsurface processes that often require specialized skill and monetary support.  To overcome these challenges, the UNESCO GRAPHIC (Groundwater Resources Assessment under the Pressures of Humanity and Climate Change) initiative strives to address the paucity of ground-water data and advance sustainable ground-water management in the face of climate change and linked human activities. To meet these objectives, GRAPHIC provides a platform and forum for exchange of information through case studies, thematic working groups, regional and global networks, research, and communication.  GRAPHIC serves the global community by providing scientifically-based recommendations that are relevant to policy.  The primary subject areas of GRAPHIC include ground-water quantity and quality, environmental interdependencies, and management and policy.  Methods of investigation include information systems, environmental monitoring, paleo-indicators of environmental change, remote sensing, geochemistry and geophysics, modeling, and inter-regional comparative studies. This presentation outlines the GRAPHIC initiative and its relevance to ground-water resources in developing countries.  Recent research activities and communication efforts under the GRAPHIC program are highlighted.

Jason J. Gurdak, U.S. Geological Survey Jason Gurdak is a hydrologist in the Colorado Water Science Center of the U.S. Geological Survey with a Ph.D. in geochemistry from the Colorado School of Mines. His general research interests include studies of ground water, contaminant hydrology, and hydroclimatology. Recent efforts have focused on the High Plains aquifer, including regional-scale modeling of nonpoint-source contamination, estimating model uncertainty, unsaturated-zone water and chemical flux studies, and investigations of subsurface hydrologic and geochemical response to natural climate variability on interannual to multidecadal scales. He has served the UNESCO-GRAPHIC project since 2005.

Timothy R. Green, USDA, Agricultural Research Service Dr. Timothy R. Green is a hydrologist with the USDA, Agricultural Research Service. His research career also includes a PhD dissertation at Stanford University, three years with the USGS Water Resources Division, and four years with CSIRO Australia Land & Water. Green’s research addresses spatial measurement and scaling of soil water and topography, upscaling soil hydraulic properties, numerical simulation of water movement in variable terrain and groundwater recharge, and hydrologic assessment of potential climate change. Green has served the UNESCO-GRAPHIC project since its inception in 2004, and recently co-edited a special issue of the Vadose Zone Journal on GRAPHIC research.


2008 Ground Water Summit