HR: 0800h
AN: H11A-1252    [Abstracts]
TI: Identification of Dominant Modes in Hydrological Systems - A Prerequisite for Catchment Characterization and Regionalization Strategies?
AU: * Schulz, K
EM: karsten.schulz@ufz.de
AF: UFZ - Centre of Environmental Research Leipzig-Halle GmbH, Permoserstr. 15, Leipzig, 04318 Germany
AU: Stauch, V
H11A-1252 AF: UFZ - Centre of Environmental Research Leipzig-Halle GmbH, Permoserstr. 15, Leipzig, 04318 Germany
AU: Volk, M
H11A-1252 AF: UFZ - Centre of Environmental Research Leipzig-Halle GmbH, Permoserstr. 15, Leipzig, 04318 Germany
AU: Jarvis, A
H11A-1252 AF: Lancaster Environment Center (LEC), Lancaster University, Lancaster, LA1 4YQ United Kingdom
AB: The dynamic behavior of hydrological systems largely differs in its complexity and dominant controls when moving across different spatial and temporal scales. Using, integrated measurements of catchment scale fluxes and system states, it is often impossible to identify mechanisms that are observed at smaller scales. Examples are the identification of effective hydraulic properties needed in Darcy's law or convection-dispersion equation from catchment river runoff data or the identification of leaf-level biophysical controls of photosynthesis using tower-based eddy-flux measurements of carbon and latent heat. Therefore, rather than building on small-scale biophysical process descriptions, we here develop and apply hybrid statistical-mechanistic methods to extract and parameterize the dominant modes of system behavior at the scale of interest. Based on current investigations of catchment runoff and water flow retention as well as latent heat and carbon-flux, minimal process representations are derived that are able to describe the system dynamics well and can also be uniquely identified. In order to relate derived process parameterizations to other catchment characteristics and spatial information derived from remote sensing or (geo-)physical information, uniqueness within the identification process is a fundamental prerequisite. Potential strategies for the regionalization and extrapolation to larger scales will also be demonstrated and discussed.
DE: 1800 HYDROLOGY
DE: 1804 Catchment
SC: Hydrology [H]
MN: Fall Meeting 2005