Climate Change Impacts on Water in NW Washington
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1 Climate Change Impacts on Water in NW Washington Roger Fuller Western Washington University
2 Climate Change: Quick refresher on the mechanism Greenhouse gases in the atmosphere act like a quilt on the earth edfenergy.com Trapped energy warms the planet
3 Climate Change Impacts: Temperature and Precipitation are Key Historical Trends across the Globe Temperature Change, Precipitation Change Over Land, Higher: red/purple Lower: blue More: blue Less: brown IPCC, 2013
4 Temperature and Precipitation Pacific Northwest Future Projections Temperature Precipitation Very Optimistic Optimistic model average range of variability
5 Some effects of changes in Temperature - Glaciers - Winter freezing elevation - Snow/rain balance - More rain per storm - River flow timing - River flow extremes - Groundwater and Soil Moisture - Sediment - Species timing of natural history events - Sea Level -
6 The Snow-Rain Balance is shifting in Skagit County
7 Average Monthly Flow (cfs) Skagit River Average Monthly Flows in the Future 50, s Avg. Monthly Flow (cfs) 25,000 Future 0 Historical Lower avg. low flows Longer duration Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Month Lower low flows Longer duration Higher and earlier flows in fall Lower and longer low flows in summer Lee et al. (2012)
8 Changes in the size of the 100-year flood 2050 s Increase 2080 s Low Carbon Emissions Scenario (RCP 4.5) Source: UW Climate Impacts Group
9 Combining a river flood with sea level rise greatly increases risk on floodplains Bigger and More Frequent Floods
10 The lower floodplain of the Skagit: where river meets tide and also highways, industry, agriculture, and 30,000 people.
11 Combining a river flood with sea level rise greatly increases risk Skagit Delta Topography Historic 100-yr River Flood 2040 s 100-yr Flood + Sea Level Rise I-5 I-5 Hwy 20 Mount Vernon Hwy 20 Mount Vernon Hwy 20 Mount Vernon Hamman et al., 2016 Flooded Area: 66 mi 2 Flooded Area: 103 mi 2 (57% increase)
12 By the 2040 s, this will be the 22-yr flood. This is what a current 100-yr flood looks like in Mount Vernon.
13 Floods Bring Lots of Sediment into the River Amount of Suspended Sediment Amount of River Flow USGS
14 Average Monthly Fow (cfs) Sediment loading (metric tons/month) Sediment loading (metric tons/month) Sediment Load (MT/month) Projected Changes in Suspended Sediment 2080s River Flow 50,000 4,000,000 Sediment in River 4,000,000 4 River Flow 3,000,000 25,000 2,000, s 3,000,000 3 Sediment Load 2,000, s 1,000,000 0 Historic Avg. 0 Oct Nov Oct Dec Nov Jan Dec Feb JanMar FebApr Mar May AprJun MayJul JunAug JulSep Aug Sep 1,000, Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Lee et al. (2016)
15 Why does more sediment matter? Positive or Negative Effects? - Salmon redds (nests) - Increased channel migration on floodplain - Flood risk in leveed areas - Drinking water costs + Tidal marshes and sea level rise - Eelgrass beds - Puget Sound water quality
16 Changes in the 2-year Summer Low Flow Lowest 7-day average flow 2050 s 2080 s But, dams help to lessen the impact Low Carbon Emissions Scenario (RCP 4.5) Source: UW Climate Impacts Group
17 Why do Low Summer Flows Matter? Summer 2015 what to expect as average for 2050 s Salinity Saltiness of Estuary estuary Soils soils summer 2015 Record Low River Flow normal Estuary Plant Height Plants were 35% shorter and didn t produce seeds due to salt stress Data from the Stillaguamish River Estuary
18 Groundwater Flow on Floodplains - river flow that is underground (called hyporheic flows ) - strongly affects the wetlands and soil moisture on floodplain Big Hole River, montana.gov GIS
19 Groundwater Flow on Floodplains Important for Floodplain wetlands Floodplain forests Farmland Lower summer flows impact these habitats by reducing groundwater flows
20 Water Impacts Summary A few of the changes ahead: Disappearing glaciers Rising winter freezing elevation Less snow, more rain in winter Higher river flows in winter Bigger floods in winter More sediment in the river, affecting people, animals, plants Lower river flows in summer, and lower floodplain groundwater Floodplain habitats and farms wetter in winter, drier in summer Higher soil saltiness in the estuary in summer On the lower delta, summer groundwater increases due to sea level rise
21 More Resources State of the Knowledge: Climate Change in Puget Sound University of Washington Climate Impacts Group
22 Thank you! Roger Fuller Erica Simek
23 Eight Focus Areas A Thriving, Sustainable Economy Emergency Preparedness Clean Energy and Efficiency Feeding Our Community Physical and Emotional Health Affordable Homes & Vibrant Neighborhoods Taking Care of our Natural Resources Clean, Multi-Modal Transportation
24 What can we do to lessen impacts, adapt, or increase resilience? Local governments Emergency preparation Education Post-disaster response Citizen science.??.what are your ideas? Apply for a TFF grant to get started!
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