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This study aims to develop climate and hydrology scenarios specific to the American River Basin, evaluating water supply and demand imbalances and proposing adaptation strategies.
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American River Basin Study: Development of Future Climate & Hydrology Scenarios Ian Ferguson, PhD, PE Bureau of Reclamation, Technical Service Center
Study Overview Objectives • Build on the SSJRBS • Develop data, tools, analyses, and adaptation strategies specific to American River Basin • Further develop and evaluate strategies to address current and projected imbalances between water supplies and demands
Study Overview Study Partners • Bureau of Reclamation • Placer County Water Agency (PCWA) • City of Roseville • City of Sacramento • El Dorado County Water Agency (EDCWA) • City of Folsom • Regional Water Authority
Study Overview Study Data & Tools • Climate Datasets • Observations: Livneh et al. 2015 • Downscaled Projections: LOCA • Hydrology Model • Variable Infiltration Capacity (VIC) Hydrology Model • Planning/Operations Model • CalSim3 Includes new refined representation of American River Basin Livneh et al Obs. Climate LOCA Climate Projections Climate Scenarios VIC Hydrology Model Hydrology Scenarios
Study Overview Study Data & Tools • Climate Datasets • Observations: Livneh et al. 2015 • Downscaled Projections: LOCA • Hydrology Model • Variable Infiltration Capacity (VIC) Hydrology Model • Planning/Operations Model • CalSim3 Includes new refined representation of American River Basin Historical Inputs: CalSim Historical Inputs: CalSimHydro Hydrology Scenarios Climate Scenarios Scenario Inputs: CalSim Scenario Inputs: CalSimHydro CalSimHydro CalSim3
Climate Scenarios Ensemble-Informed Period-Change Climate Scenarios: • Distill large number of projections into manageable number of scenarios for detailed analysis • Combine projected climate change with observed historical climate variability • Consistency with planning tools/methods based on fixed level-of-development or build-out conditions
Climate Scenarios Future Time Horizons
Climate Scenarios Projection Selection
Climate Scenarios Quantile Mapping
Climate Scenarios Quantile Mapping
Climate Scenarios Precipitation 2040-2069 Hotter & Drier Warmer & Wetter
Climate Scenarios Precipitation 2070-2099 Hotter & Drier Warmer & Wetter
Climate Scenarios Temperature 2040-2069 Hotter & Drier Warmer & Wetter
Climate Scenarios Temperature 2070-2099 Hotter & Drier Warmer & Wetter
Hydrology Scenarios Total Runoff 2040-2069 Hotter & Drier Warmer & Wetter
Hydrology Scenarios Total Runoff 2070-2099 Hotter & Drier Warmer & Wetter
Hydrology Scenarios Total Runoff 2070-2099
Hydrology Scenarios Total Runoff 2070-2099
Hydrology Scenarios Reference ET (ETo) 2070-2099
Hydrology Scenarios Reference ET (ETo) 2070-2099
Summary • New suite of climate and hydrology scenarios for CVP/SWP watersheds • Period-change ensemble-informed methodology • Based on projected changes in precipitation and temperature over American River Basin • Scenarios project significant changes in water supply (runoff) and demand (ETo) • Basin Study will use scenarios to evaluate future CVP/SWP performance and reliability under current operations and proposed adaptation strategies.
Summary • Additional talks re: American River Basin Study on Wednesday Afternoon (1:15-3:30) Matthew Bachman Upper American River Representation in CalSim 3.0 Raymond Hoang Application of CalSim 3.0 in the American River Basin Study