TY - Generic T1 - Integration of SNODAS Data Products and the PRMS Model - An Evaluation Of Streamflow Simulation and Forecasting Capabilities T2 - 74th Annual Western Snow Conference Y1 - 2006 A1 - Leavesley, G.H. A1 - Cline, D. A1 - Carroll, T. A1 - Hay, L.E. A1 - Viger, R.J. KW - PRMS, HRU, energy balance model, SNODAS, NOHRSC, satellite AB - The U.S. Geological Survey (USGS) hydrologic model PRMS is being used to simulate and predict daily snowmelt runoff for a number of basins in the western United States. PRMS is a distributed-parameter model that uses the concept of polygon or gridded hydrologic response units (HRUs) to account for the spatial and temporal distribution of snow accumulations and melt. It was developed for application to a wide range of basins where available meteorological data are typically limited to daily precipitation and maximum and minimum air temperature. An energy balance and water balance are computed daily for each HRU. The sum of the water balances of each HRU, weighted on a HRU-area basis, produces the daily basin response. The Snow Data Assimilation System (SNODAS) is a modeling and data assimilation system developed by the National Weather Service's National Operational Hydrologic Remote Sensing Center (NOHRSC) to provide estimates of snow cover, snow water equivalent, snowmelt, and associated snowpack variables at a 1-km spatial resolution to support hydrologic modeling and analysis. SNODAS includes procedures to ingest and downscale output from Numerical Weather Prediction (NWP) models; a physically based, spatially-distributed energy-and-mass-balance snow model; and procedures to assimilate satellite-derived, airborne and ground-based observations of snow covered area (SCA) and snow water equivalent. These gridded products can be used for comparing and/or updating spatially distributed state variables in PRMS. Comparison of PRMS and SNODAS SCA on selected basins show comparable results. (Abstract only) JF - 74th Annual Western Snow Conference T3 - Proceedings of the 74th Annual Western Snow Conference PB - Western Snow Conference CY - Las Cruces, NM UR - sites/westernsnowconference.org/PDFs/2006Leavesley.pdf ER - TY - Generic T1 - A microcomputer-based watershed modeling and data-management system T2 - 55th Annual Western Snow Conference Y1 - 1987 A1 - Leavesley, G.H. A1 - Lumb, A.M. A1 - Saindon, L.G. KW - Microcomputers, PRMS, Snowmelt Model AB - The U.S. Geological Survey's Precipitation-Runoff Modeling System (PRMS), an interactive processor for hydrologic modeling and data management called ANNIE, and a modified version of the National Weather Service's Extended Streamflow Prediction (ESP) program have been modified and enhanced for microcomputer application. Watershed-simultion capabilities are provided by PRMS, a modular-design distributed-parameter watershed model. Model input is read from files prepared by ANNIE, and model output can be generated for graphical and statistical analysis by ANNIE. ANNIE helps a user interactively create, check, uptdate, reformat, transform, and statistically and graphically analyze meteorologic and hydrologic data. Forecasting capability is provided by the coupling of PRMS and ESP. ESP prodcuces a probablistic forecast for streamflow variables, such as maximum flow, flow volume, and the date flow decreases below a selected volume. JF - 55th Annual Western Snow Conference T3 - Proceedings of the 55th Annual Western Snow Conference PB - Western Snow Conference CY - Vancouver, British Columbia UR - sites/westernsnowconference.org/PDFs/1987Leavesley.pdf ER - TY - Generic T1 - A precipitation-runoff modeling system for evaluating the hydrologic impacts of energy resouces development T2 - 49th Annual Western Snow Conference Y1 - 1981 A1 - Leavesley, G.H. A1 - Lichty, R.W. A1 - Troutman, B.M. A1 - Saindon, L.G. KW - Modeling, Precipitation, Runoff, Snowmelt AB - A modular design precipitation-runoff modeling system is being developed for evaluating the impacts of various combinations of precipitation, climate, and land use on runoff, sediment yields, and general basin hydrology. Normal and extreme rainfall and snowmelt events will be simulted for various combinations of land use to evaluate changes in water-balance relationships, soil-water relationships, flow regimes, flood peaks and volumes, sediment yields and groundwater recharge. A major component of the modeling system is snowmelt runoff. Initial development, testing, and verification of the snowmelt components are being conducted in the major coal and oil-shale regions of the western United States. A number of representative study basins have been instrumented in each region to provide data on basin hydrology before, during, and after energy resource extraction. An overview of the modeling system is presented and the snowmelt components are described in detail. JF - 49th Annual Western Snow Conference T3 - Proceedings of the 49th Annual Western Snow Conference PB - Western Snow Conference CY - St. George, Utah UR - sites/westernsnowconference.org/PDFs/1981Leavesley.pdf ER -