HR: 16:00h
AN: H14C-01 INVITED     [Abstracts]
TI: Bridging the Gap Between Gephysical Measurements and Hydrological Modelling
AU: * Huisman, J A
EM: sander.huisman@agrar.uni-giessen.de
AF: Institute of Landscape Ecology and Resources Management, University of Giessen Heinrich-Buff-Ring 26, Giessen, 35392 Germany
AU: Bouten, W
EM: w.bouten@science.uva.nl
AF: Institute for Biodiversity and Ecosystem Dynamics - Computational Bio- and Physical Geography, Universiteit van Amsterdam, Nieuwe Achtergracht 166, Amsterdam, 1018 WV Netherlands
AU: Ferre, T P
EM: ty@hwr.arizona.edu
AF: Department of Hydrology and Water Resources, University of Arizona, 1133 E. North Campus Drive, Tucson, AZ 85721-0011 United States
AB: It has long been recognized that the spatial variability of system properties can dominate hydrological fluxes at all scales. Therefore, modellers have attempted to include heterogeneity in their hydrological models. Commonly, the distribution of key system properties has been determined by inverse modelling on a limited number of point measurements (e.g. pressure heads, water content) or a spatially aggregated flux (e.g. stream flow). Generally, these inverse modelling problems are ill-posed due to an inadequate spatial measurement resolution and/or a low information content of the measured signal with respect to the system properties. Ill-posed problems result in non-unique inversion results and considerable uncertainty in the system property distribution and the simulated hydrological fluxes. Geophysical measurement techniques, such as ground penetrating radar, electrical resistivity tomography, and electromagnetic induction among others, have the unique ability to provide measurements with a spatial resolution that is much higher than conventional measurement techniques. Therefore, it is reasonable to expect that the application of geophysical measurement in hydrology (i.e. hydrogeophysics) should allow the construction of hydrological models that better describe the heterogeneity of the system. Despite the consolidation of hydrogeophysics as a research field, there have been a surprisingly small number of studies where geophysical measurements are actually combined with hydrological modelling. Instead, system characterization has been the main focus of hydrogeophysics in the past years. In this contribution, we provide an overview of methods that can be used to combine geophysical measurements and hydrological modelling. We also discuss the potentials and limitations of both the current generation of hydrological models and selected geophysical measurement techniques for their combined use. Finally, we will attempt to point out future research needs.
DE: 1899 General or miscellaneous
DE: 1860 Runoff and streamflow
DE: 1866 Soil moisture
DE: 1894 Instruments and techniques
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting