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Quantifying the Effects of Climate Variability and Change on Hydrologic Extremes in the Pacific Northwest Region of N. America Alan F. Hamlet Ingrid Tohver Se-Yeun Lee •JISAO/CSES Climate Impacts Group •Dept. of Civil and Environmental Engineering University of Washington CBCCSP Research Team Lara Whitely Binder Pablo Carrasco Jeff Deems Marketa McGuire Elsner Alan F. Hamlet Carrie Lee Se-Yeun Lee Dennis P. Lettenmaier Jeremy Littell Guillaume Mauger Nate Mantua Ed Miles Kristian Mickelson Philip W. Mote Rob Norheim Erin Rogers Eric Salathé Amy Snover Ingrid Tohver Andy Wood http://www.hydro.washington.edu/2860/products/sites/r7climate/study_report/CBCCSP_ chap1_intro_final.pdf The Myth of Stationarity: 1) Climate Risks are stationary in time. 2) Observed streamflow records are the best estimate of future variability. 3) Systems and operational paradigms that are robust to past variability are robust to future variability. The Myth of Stationarity Meets the Death of Stationarity Muir Glacier in Alaska Aug, 13, 1941 Aug, 31, 2004 Image Credit: National Snow and Ice Data Center, W. O. Field, B. F. Molnia http://nsidc.org/data/glacier_photo/special_high_res.html Why a Focus on Hydrologic Extremes? Many human and natural systems are quite robust under “normal” conditions, but have the potential to be profoundly impacted by hydrologic extreme events. Floods http://www.nps.gov/mora/parknews/upload/floodPP.pdf Drought Evacuated Reservoir During the 2001 PNW Drought Wildfire Low Flow and Temperature Impacts to Fish Temperature/ Disease Related Fish Kill in the Klamath River in 2002 Dissolved Gas Management Tailrace below Bonneville Dam Dam Safety Aftermath of the Johnstown Flood 1889 Dilution Flows for Industrial Pollutants Stormwater Management Sediment Transport and Mudslides Historical Perspectives: Changing Flood Risk in the 20th Century References: Niemann, PJ, LJ Schick, FM Ralph, M Hughes, GA Wick, 2010: Flooding in Western Washington: The Connection to Atmospheric Rivers, J. of Hydrometeorology, (in review) Hamlet AF, Lettenmaier DP (2007) Effects of 20th century warming and climatevariability on flood risk in the western U.S. Water Resour Res, 43:W06427.doi:10.1029/2006WR005099 Observed Characteristics of Extreme Precipitation Events Evidence of Changing Flood Statistics Role of Atmospheric Rivers in Flooding (Nov 7, 2006) Niemann, PJ, LJ Schick, FM Ralph, M Hughes, GA Wick, 2010: Flooding in Western Washington: The Connection to Atmospheric Rivers, J. of Hydrometeorology, (in review) Role of Atmospheric Rivers in Flooding (Oct 20, 2003) Niemann, PJ, LJ Schick, FM Ralph, M Hughes, GA Wick, 2010: Flooding in Western Washington: The Connection to Atmospheric Rivers, J. of Hydrometeorology, (in review) Niemann, PJ, LJ Schick, FM Ralph, M Hughes, GA Wick, 2010: Flooding in Western Washington: The Connection to Atmospheric Rivers, J. of Hydrometeorology, (in review) Modeling Studies of Changing 20th Century Flood Risk in the West Schematic of VIC Hydrologic Model • • • General Model Schematic Sophisticated, fully distributed, physically based hydrologic model Widely used globally in climate change applications 1/16 Degree Resolution (~5km x 6km or ~ 3mi x 4mi) Snow Model Ln (X100 / Xmean) OBS Avg WY Date of Flooding OBS Evaluating the Hydrologic Model Simulations in the Context of Reproducing Flood Characteristics Avg WY Date of Flooding VIC Ln (X100 / Xmean) VIC Red = PNW, Blue = CA, Green = Colo, Black = GB X100 GEV flood/mean flood 100-yr Red = VIC Blue = OBS 50-yr 20-yr 10-yr 5-yr Zp Regionally Averaged Temperature Trends Over the Western U.S. 1916-2003 3.00 Linear Trend (Deg. C per century) CA PNW CRB Tmax 2.50 GBAS PNW 2.00 1.50 1.00 0.50 0.00 -0.50 -1.00 oct nov dec jan feb mar apr may jun jul aug sep GB CA CRB Linear Trend (Deg. C per century) 4.00 CA 3.50 CRB Tmin GBAS 3.00 PNW 2.50 2.00 1.50 1.00 0.50 0.00 oct nov dec jan feb mar apr may jun jul aug sep Detrended Temperature Driving Data for Flood Risk Experiments Temperature “Pivot 2003” Data Set 1915 “Pivot 1915” Data Set 2003 DJF Avg Temp (C) Simulated Changes in the 20-year Flood Associated with 20th Century Warming DJF Avg Temp (C) X20 2003 / X20 1915 X20 2003 / X20 1915 X20 2003 / X20 1915 Schematic of a Cool Climate Flood Precipitation Produces Snow Precipitation Produces Runoff Precipitation Produces Snow Freezing Level Snow Melt Snow Melt Precipitation Produces Runoff Precipitation Produces Snow Precipitation Produces Snow Schematic of a Warm Climate Flood Freezing Level 2000 1996 1992 1988 1984 1980 1976 1972 1968 1964 1960 1956 1952 1948 1944 1940 CRB 1936 CA 1932 1928 3 1924 1920 1916 Std Anomalies Relative to 1961-1990 Regionally Averaged Cool Season Precipitation Anomalies 4 PNW PRECIP GB 2 1 0 -1 -2 -3 DJF Avg Temp (C) 20-year Flood for “1973-2003” Compared to “1916-2003” for a Constant Late 20th Century Temperature Regime X20 ’73-’03 / X20 ’16-’03 X20 ’73-’03 / X20 ’16-’03 Summary of Flooding Impacts Rain Dominant Basins: Increases in flooding due to increased precipitation intensity, but no significant change from warming alone. Mixed Rain and Snow Basins Along the Coast: Strong increases due to warming and increased precipitation intensity (both effects increase flood risk) Inland Snowmelt Dominant Basins: Relatively small overall changes because effects of warming (decreased risks) and increased precipitation intensity (increased risks) are typically in the opposite directions. Effects of ENSO and PDO on Flood Risk X100 wENSO / X100 2003 X100 nENSO / X100 2003 X100 cENSO / X100 2003 DJF Avg Temp (C) DJF Avg Temp (C) DJF Avg Temp (C) X100 wENSO / X100 2003 X100 nENSO / X100 2003 X100 cENSO / X100 2003 X100 nPDO / X100 2003 X100 wPDO / X100 2003 X100 cPDO / X100 2003 DJF Avg Temp (C) DJF Avg Temp (C) DJF Avg Temp (C) X100 wPDO / X100 2003 X100 nPDO / X100 2003 X100 cPDO / X100 2003 Scenarios of Flood Risk in the 21th Century 21st Century Climate Impacts for the Pacific Northwest Region Mote, P.W. and E. P. Salathe Jr., 2010: Future climate in the Pacific Northwest, Climatic Change, DOI: 10.1007/s10584-010-9848-z Seasonal Precipitation Changes for the Pacific Northwest Mote, P.W. and E. P. Salathe Jr., 2010: Future climate in the Pacific Northwest, Climatic Change, DOI: 10.1007/s10584-010-9848-z http://www.hydro.washington.edu/2860/ Columbia Basin Climate Change Scenarios Project 297 Sites •Smaller basins down to ~500 km2 •Monthly and daily streamflow time series •Assessment of hydrologic extremes (e.g. Q100 and 7Q10) Available PNW Scenarios A1B Emissions Scenario B1 Emissions Scenario 2020s 10 9 2040s 10 9 2080s 10 9 19502098+ 7 7 2020s 2040s 2080s 1 1 1 1 1 1 Downscaling Approach Hybrid Delta Transient BCSD Delta Method hadcm cnrm_cm ccsm3 echam5 echo_g cgcm3.1_t4 7 pcm1 miroc_3.2 ipsl_cm4 hadgem1 hadcm cnrm_cm ccsm3 echam5 echo_g cgcm3.1_t4 7 pcm1 composite of 10 2020s – mean 2010-2039; 2040s – mean 2030-2059; 2080s – mean 2070-2099 Hybrid Downscaling Method • Performed for each VIC grid cell: Hist. Daily Timeseries Projected Daily Timeseries 1916-2006 Bias Corrected Future Monthly CDF 30 yr window 1916-2006 Hist. Monthly Timeseries Historic Monthly CDF 1970-1999 1916-2006 “Base Case” Spatial Variability of Temperature and Precipitation Changes Monthly to Daily Precipitation Scaling 100 SeaTac. Feb, 1996, hypothetical 30% Increase Daily Precipitation (mm) 90 80 hist 70 future 60 50 40 30 20 10 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 Day of Month Schematic of VIC Hydrologic Model • • • General Model Schematic Sophisticated, fully distributed, physically based hydrologic model Widely used globally in climate change applications 1/16 Degree Resolution (~5km x 6km or ~ 3mi x 4mi) Snow Model Watershed Classifications: Transformation From Snow to Rain Map: Rob Norheim Flood Analysis: What’s In? What’s Out? Issue Affecting Analysis Based on explicit daily time step simulations of streamflow? Changing freezing elevation? Rain on snow captured? Increases/decreases in storm intensity? Changes in tails of probability distributions affecting extreme daily precipitation ? Changes in size and sequencing of storms? Changes in small scale thunder storms? Includes water management effects? Yes No Yes Yes Yes Yes (monthly statistics only) No No No No Low Flow Analysis: What’s In? What’s Out? Issue Affecting Analysis Based on explicit daily time step simulations of streamflow? Effects of changing snowmelt and soil moisture dynamics? Effects of changing evaporation? Changes in sequencing or duration of drought? Includes shallow ground water? Yes No Yes Yes Yes, but some potential factors omitted (e.g. changes in cloudiness) No Includes deep groundwater? No, but typically captures relevant affects to low flows anyway (well correlated) No Includes effects of glaciers? No Includes water management effects? No Simulate Daily Time Step Streamflow Scenarios Associated with Changes in Climate Fit Probability Distributions To Estimate Flood and Low Flow Risks Compare Flood Risks to Those in the 20th Century Probability of Exceedance 0.01 0.04 0.07 0.11 0.14 0.17 0.20 0.24 0.27 0.30 0.34 0.37 0.40 0.43 0.47 0.50 0.53 0.57 0.60 0.63 0.66 0.70 0.73 0.76 0.80 0.83 0.86 0.89 0.93 0.96 0.99 Streamflow (cfs) 120000 SNOMO 100000 80000 60000 HIST ECHAM5_2040 40000 20000 0 2040s Changes in Flood Risk Snohomish at Monroe A1B B1 Historical 10 Member Ensemble Using the Hybrid Delta Downscaling Approach 2040s Changes in 7Q10 Snohomish at Monroe A1B Historical B1 10 Member Ensemble Using the Hybrid Delta Downscaling Approach Chehalis at Grand Mound Relationship Between Change in Q100 and Winter Temp Changes in High Flows Q100 values are projected to systematically increase in many areas of the PNW due to increasing precipitation and rising snowlines. http://www.hydro.washington.edu/2860/products/sites/r7climate/study_report/CBCCSP _chap7_extremes_final.pdf Changes in Low Flows 7Q10 values are projected to systematically decline in many areas due to loss of snowpack and projected dryer summers http://www.hydro.washington.edu/2860/products/sites/r7climate/study_report/CBCCSP _chap7_extremes_final.pdf Current and Future Research •Additional VIC calibration to improve simulations, and comparison with DHSVM models (proposed) •Estimate the effects of reservoir management using simulation models (in progress) •Optimized flood control operations to rebalance complex multiobjective reservoir systems •Incorporate more realistic effects to extreme precipitation from regional scale climate models (in progress) •Incorporate the effects of sea level rise and high flows on inundation using hydrodynamic modeling (proposed) Regional Climate Modeling at CIG WRF Model (NOAH LSM) 36 to 12 km ECHAM5 forcing CCSM3 forcing (A1B and A2 scenarios) HadRM 25 km HadCM3 forcing Extreme Precipitation Change from 1970-2000 to 2030-2060 in the percentage of total precipitation occurring when daily precipitation exceeds the 20th century 95th percentile Salathé, E.P., L.R. Leung, Y. Qian, and Y. Zhang. 2010. Regional climate model projections for the State of Washington. Climatic Change 102(1-2): 51-75, doi: 10.1007/s10584-010-9849-y Snohomish River Near Monroe, WA