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Explore the most appropriate models for different climatic and physiographic regions, robust parameter estimation methods, uncertainty bounds for ungauged basins, and reliable calibration methods. Participants from various universities and institutes analyze MOPEX basins in desert, steppe, tundra, and forest environments.
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Science Issues • What models are most appropriate for different climatic and physiographic regions? • What are the most robust parameter estimation methods? • What are the uncertainty bounds for ungauged basin applications? • What are the most robust calibration methods?
NWS (SWB & SAC) Meteo France (ISBA) Russian Academy of Science (SWAP) UC Berkeley / Princeton (VIC) Cemagref, France (GR4J) NCEP (NOAH) USGS (PRMS) Yamanashi University (BTOPMC) Swedish Meteor. and Hydro. Institute, Sweden (HBV) University of Alberta, Canada (SAC) Participants • University of Arizona • University of Newcastle, Australia • Centre for Ecology and Hydrology, UK • Oregon State University • Wageningen University, The Netherlands • National Institute of Hydrology, Canada • University of New Hampshire
desert steppe tundra Climatic Hydrologic Ratios forest
A Priori Results- Average and Standard Deviation of Daily Efficiency
A Priori Results- Average Daily Efficiency of 6-Best & Worst Basins
Calibration- Average and Standard Deviation of Daily Efficiency
Calibration-Average Daily Efficiency of 6-Best & Worst Basins
Hydrologic landscape regions • A statistical clustering (20 clusters) of the factors that define hydrologic landscapes • Among-region variability in the factors is maximized and within-region variability is minimized
Hydrologic landscapes: A combination of natural factors (climate, geology, and terrain) expected to affect hydrologic transport processes
Precip – Potential evapotranspiration Percent sand Bedrock permeability Topography Factors used to define hydrologic landscape regions
Expanded a priori Parameter Estimation Study Hydrologic Landscape Regions Selected Basins
DIGITAL DATABASES (1 km2 resolution) Vegetation Type (USFS) Vegetation Density (USFS) Land Use-Land Cover (USGS)
SW Solar Radiation Climatological monthly means Interpolated (multiple linear regression)
20 Hydrologic Landscape Regions (61 basins)
20 Hydrologic Landscape Regions (46 basins)
20 Hydrologic Landscape Regions (46 basins) 18 16 15 9 16 7
438 U.S. Basins Meet Criteria for MOPEX Basin Selection Criteria: Number of Precipitation Gages > 0.6 * Area**0.3 Gage Density vs Basin Size Location of basins with Adequate gage density
International Contributed Data Sets (58 basins to date) • Australia – University of Melbourne • U.K. – CEH • France – Meteo France • China
Possible Additional Basins • Germany • Sweden • Austria • Tanzania • Global monthly (UNH) • Canada • Japan • Brazil • Others?