Alan F. Hamlet •JISAO/CSES Climate Impacts Group•Dept. of Civil and Environmental Engineering

University of Washington

Effects of Projected Climate Change on the Hydrology of the Puget Sound Region

Global Climate Change Scenarios for the PNW

Mote, P.W. and E. P. Salathe Jr., 2010: Future climate in the Pacific Northwest, Climatic Change, DOI: 10.1007/s10584-010-9848-z

21st Century Climate Impacts for the Pacific Northwest Region

Seasonal Precipitation Changes for the Pacific Northwest

http://cses.washington.edu/db/pdf/wacciach1scenarios642.pdf

Hydrologic Projections

297 Streamflow

Sites

• Provide a wide range of products to address multiple stakeholder needs

• Increase spatial and temporal resolution

• Provide a large ensemble of climate scenarios to assess uncertainties

• Address hydrologic extremes (e.g. Q100 and 7Q10)

Columbia Basin Climate Change Scenarios Project

Goals and Objectives

http://www.hydro.washington.edu/2860/

Mixed Rain and Snow (Warm):

Nisqually River at La Grande Dam

SWE Runoff

Changes in Hydrologic Extremes

2040s Changes in Flood RiskNisqually River at La Grande

A1B B1

Historical10 Member Ensemble Using the Hybrid Delta Downscaling Approach

A1B B1

2040s Changes in Flood RiskNisqually River at La Grande

Historical10 Member Ensemble Using the Hybrid Delta Downscaling Approach

Related Impacts

Mass Balance of the Nisqually Glacier

http://faculty.washington.edu/scporter/Rainierglaciers.html

1997

1910

http://www.abbegeomorphology.com/?p=69

Sediment Impacts in the Nisqually Headwaters

Water Resources Management and Structures

Alder Dam

Effects to Stream Temperature

Mantua, N., I. Tohver, A.F. Hamlet, 2010: Climate change impacts on streamflow extremes and summertime stream temperature and their possible consequences for freshwater salmon habitat in Washington State,

Climatic Change, online first, doi: 10.1007/s10584-010-9845-2

Nicholls, R. J. and Cazenave, A. (2010) Sea-Level Rise and Its Impact on Coastal Zones. Science 328, 1517-1520

Sea Level Rise