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LTER Intersite Hydrological Comparison

Regionalisation in Hydrology :

The Role of Vegetation, Soils and Climate in
Driving Catchment-Scale Hydrologic Response

AGU 1998 Spring Meeting, May 26-29, Boston

The hydrologic response of catchments is controlled by a complex function of ecological, climatic, and geomorphic processes. Predicting the hydrologic response of ungauged catchments can be accomplished using regionalisation techniques, where the catchment under consideration is considered to behave similarly to other, gauged catchments. However, for such techniques to have wider application, hydrologic response needs to be understood in terms of the processes driving it, such as climate, vegetation, soils, and topography.

The hydrologic characteristics being regionalised may be provided by a rainfall-runoff model, or they may be derived from long-term streamflow records without the use of a model, as is often the case for flood frequencies, annual water yields, or low flow characteristics. In either case, high quality, long-term hydrologic data are required in order to adequately define the hydrologic response of a catchment. This hydrologic response then needs to be related to its ecological, climatic, and geomorphic controls. Because there are many different approaches to regionalisation, and because these approaches are often region-specific, collaboration within the hydrologic community is especially important.

This session represents a valuable opportunity to review the research being carried out and assess the potential applications and limitations of regionalisation techniques, particularly as related to inter-regional comparisons. We invite contributions dealing with all aspects of the regionalisation of hydrologic response. This includes contributions from the field of rainfall-runoff modelling, as well as from researchers examining long-term hydrologic, climatic, and vegetation data sets, such as are available at a number of Long-Term Ecological Research (LTER) and other sites. Please remember to send abstract to both AGU and the session convener.

Conveners : David Post, Department of Geosciences, Oregon State University, Forestry Sciences Laboratory, 3200 SW Jefferson Way, Corvallis, OR 97331, Phone : 541-758-7767, Fax : 541-758-7760, E-mail : post@fsl.orst.edu; and Qingyun Duan, GCIP Climate Project, NWS/NOAA, 1325 East-West Hwy, Silver Spring, MD 20910, Phone : 301-713-1018, Fax : 301-713-1051, E-mail : qingyun.duan@noaa.gov.