HR: 0800h
AN: C31A-0310    [Abstracts]
TI: A Water Balance Approach to Characterizing the Hydroclimatology of a Mountainous Semi-arid Catchment
AU: * Chauvin, G
EM: chau3352@uidaho.edu
AF: University of Idaho, Environmental Science Program, Morrill Hall 207, Moscow, ID 83844-3006 United States
AU: Flerchinger, G
EM: gflerchi@nwrc.ars.usda.gov
AF: Northwest Watershed Research Center, USDA-ARS, 800 Park Blvd., Plaza IV, Suite 105, Boise, ID 83712-7716 United States
AU: Marks, D
EM: danny@nwrc.ars.usda.gov
AF: Northwest Watershed Research Center, USDA-ARS, 800 Park Blvd., Plaza IV, Suite 105, Boise, ID 83712-7716 United States
AU: Link, T
EM: tlink@uidaho.edu
AF: University of Idaho, Department of Forest Resources, PO Box 441133, Moscow, ID 83844-1133 United States
AB: A long-term water balance is needed to understand the hydrology of mountainous semi-arid catchments, which exhibit considerable interannual variability in precipitation and temperature as well as spatial variation in snow accumulation, soils, and vegetation. Long-term data sets reduce the uncertainty associated with estimating water balance quantities that are difficult to measure in practice. In this study, the data required to compute a long-term water balance are assembled from on-site and nearby locations to create a continuous 21-year hourly record of precipitation, meteorological parameters, and streamflow for the Upper Sheep Creek (USC) catchment, a 26 ha, snow-fed, semi-arid rangeland headwater drainage within the Reynolds Creek Experimental Watershed in southwestern Idaho, USA. This study will allow us to extend a previous 10-year water balance (water years 1985-1994) computed for the USC catchment, enabling a more thorough consideration of climate variability including periods of drought and flood. It also sets the stage for analyzing the hydrologic response of the USC catchment to a prescribed fire planned for 2006. Statistical correlations between on-site and nearby meteorological stations were used to develop a complete 21-year hourly data set (water years 1984-2004) of climate and precipitation records. These data will be used to drive the Simultaneous Heat and Water (SHAW) model to simulate evaporation and transpiration, precipitation, storage, and stream discharge. Water balance quantities will be computed for separate landscape units and then aggregated for the overall watershed. This research will improve our ability to manage water resources in semi-arid mountain regions.
DE: 1818 Evapotranspiration
DE: 1833 Hydroclimatology
DE: 1854 Precipitation (3354)
DE: 1860 Runoff and streamflow
DE: 1863 Snow and ice (1827)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting