corps of engineers building strong ® climate change / adaptation jerry w. webb, p.e., d.wre...
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Corps of Engineers
BUILDING STRONG®
Climate Change / Adaptation
Jerry W. Webb, P.E., D.WREPrincipal Hydrologic & Hydraulic EngineerHydrology, Hydraulics & Coastal Community of Practice LeaderUS Army Corps of Engineers, Headquarters [email protected]
Dam Safety WorkshopBrasília, Brazil20-24 May 2013
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US Army Corps of Engineers Civil Works Missions: Water Resources Management
2NAVIGATION
Navigation
Flood and Coastal
Storm Risk Reduction
Ecosystem Restoration
Hydropower
Water Supply
Recreation
Emergency Management
Regulatory
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WATER
CARBONClimate change mitigation is
about
Climate change adaptation is
about
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USACE Climate Adaptation Mission:
To improve resilience and decrease vulnerability to the
effects of climate change and variability
Bill Byrne, MA F&W
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USACE Climate Adaptation Policy June 2011 Integrate climate change
adaptation planning and actions into USACE missions, operations, programs, and projects
Use the best available and actionable climate science and climate change information at appropriate level of analysis
Consider climate change impacts when undertaking long-term planning, setting priorities, and making decisions
http://www.corpsclimate.us/adaptationpolicy.cfm
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Climate Change, Extreme Events and Water Infrastructure
Extreme events and increasing variability increase water resources vulnerability►Public health and safety►Economic development►Environmental
sustainability
National Geographic
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Extremes and Surprises Add Complexity “… the biggest issue is not a failure to envision
events that may be surprising.”
“It is a failure to decide which ones to act upon, and to what degree.”
“That failure results, at least partially, from the fact that there is no systematic mechanism in place…. to help decide which events to act upon aggressively, which to treat to a lesser degree, and which to ignore, for the time being.”
US DoD Defense Science Board: Capability Surprises
7
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0 10 20 30 40 50 60 70 80 90 100
Years
Increasing Severity of Climate Impacts
Infrastructure planned and built with past climate and weather in mind may not be adequate for future resilience and operation.
Planning
Engineering and Design
Construction
Infrastructure Service Life
In Service
After United States Ports: Addressing the Adaptation Challenge, Mr. Mike Savonis
Water Resources Infrastructure Long Service Life and Long Lead Time
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DIS
ASTE
R
Adaptation to Climate Change and Extreme Events is a Continuum
Analyses, Operational Measures,
Anticipatory Engineering
Policy, Structural Measures, Post-Event
Adaptation
Preparedness, Response, Recovery
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Pakistan Siachen Glacier SME
Support April 2012
Key 2011/2012 ResponsesQueensland, Australia
Flood - Jan 2011Christchurch, New Zealand
Earthquake - Feb 2011
FEST Deployments Jan – Mar 2011 &
OEF/OND
Japan EQ & Tsunami - Mar 2011
MS FloodsMay 2011
Fort CrowderLogistics Point
RRCC VII
Joplin, MO (RFO)
Joplin, MOTornado - June
2011 MO River Flood
Jun/Jul 2011
Thailand Flood - Nov 2011
Northeast Snow StormOct 2011
Hurricane Irene
Aug 2011
Tropical Storm LeeSep 2011
Souris River Flood
Jun/Jul 2011
Severe Weather – Midwest
Mar 2012
AL & MS TornadosApr 2011
2012 Drought
Duluth, MN Flood
Derecho StormsJUN-JUL 12
Kootenai River, 8.96 million acres, 2 countries, 2 states75% in BC, 21% in MT, 6% in ID
Koocanusa Reservoir
Libby Dam
Bonners Ferry
Queens Bay at Kooteney Lake
Corra Linn Dam
To the Columbia River
Kootenai River Basin2012
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Quick Review of Using Scenarios in Support of
Climate Change Analyses With Emphasis on Sea-Level
Change
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Changing Paradigms: From Equilibrium to Dynamic
Hurricane Katrina► Internal and external reviews
following Hurricane Katrina (IPET, HPDC, ASCE, National Academies, and others) demonstrated that we need to incorporate new and changing conditions, both foreseen and surprise, into USACE projects and programs
Stationarity► Climate change undermines a
basic assumption that historically has facilitated management of water supplies, demands, and risks.’ Milly et al 2008
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Fundamental Change in Approach to Future Conditions
Historically, we identified a single most likely future condition and based our without-project (baseline) analyses on this condition
Now, we understand that there can be multiple plausible futures, each representing a different combination of physical processes, social and political values, and economic conditions, among other factors
In particular, for hydrology, we can no longer rely on the assumption of stationarity, where statistical properties of hydrologic variables in future time periods are assumed to be similar to past time (i.e., future variation in the same range as in the past)
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Universe of Futures
Carter et al (2007)
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“We need to research all the potential outcomes, not try to guess which is likeliest to occur.”
“Probability in the natural sciences is a statistical approach relying on repeated experiments and frequencies of measured outcomes, in which the system to be analysed can be viewed as a ‘black box’. Scenarios describing possible future developments in society, economy, technology, policy and so on, are radically different.”
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Why Scenarios? Scenarios are appropriate when uncertainties are large,
the consequences are significant, and outcomes cannot be bounded
Scenarios are intended to illuminate potential vulnerabilities to the range of outcomes
Once we've identified how and where we are vulnerable, we can evaluate whether we are equipped to deal with the vulnerabilities
Next, we address trade-offs between costs and other effects under each option to address vulnerabilities
Probabilities simplify the math, but don't really help us to explore these kinds of issues – instead, probabilities make it easy for us to ignore these issues
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Why Scenarios for Sea-Level Change? Remember, scenarios are appropriate when
uncertainties are large, the consequences are significant, and outcomes cannot be bounded
Sea level change (and more broadly, broader climate change) meets the first and last of these three conditions.
For the second condition, we use sensitivity testing to determine the potential consequence of sea-level change, and the sensitivity test guides our scope of study and the rigor of the scenario analysis
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EC 1165-2-211 Incorporating Sea Level Change Considerations in Civil Works Programs
Three estimates of future SLC must be calculated for all Civil Works Projects within the extent of estimated tidal influence:
► Extrapolated trend► Modified NRC Curve 1► Modified NRC Curve III
These curves are scenarios based on different assumptions about physical processes and causes without specific attributions of likelihood
As a result, the scenarios
used in the EC represent multiple plausible futures
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Comparison of EC 1165-2-211, IPCC, and Other Recent Research
~ EC
Does not include changes in sea level resulting from changes in the large ice sheets covering Greenland and Antarctica
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Examples of Climate Change Adaptation
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Example: Mississippi Watershed Extremes
60%
40%
Ohio River
Upper Mississippi andMissouri RiversCombined
Flow Contribution to Lower Mississippi River
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• Flood of 2011 tested system• Huge volume, long duration, snowmelt and rainfall• System performed as designed
• Flood risk reduction systems were operated at their maximum capacity, some for the first time ever
• Design demonstrated incredible foresight
• Drought of 2012 tested system again• Impacts to navigation, water supply, recreation, energy
production
• 2011 and 2012 highlighted resilience to extreme events
Mississippi River Extremes
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Columbia River Treaty 2014/2024 Climate Change Impact Studies
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2020s
2040s
2080s
°C
* Compared with 1970-1999 averageMote and Salathé, 2010
+2.0ºF (1.1-3.4ºF)
+3.2ºF (1.6-5.2ºF)
+5.3ºF (2.8-9.7ºF)
°F
Choice of emissions scenario matter more after 2040s
Projected Increases in Annual Temperature
HH
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* Compared with 1970-1999 average
Changes in annual precipitation averaged over all models are small but some models show large seasonal changes, especially toward wetter autumns and winters and drier summers.
Mote and Salathé, 2010
Projected Changes in Annual Precipitation HH
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As the West warms,spring flows rise and summer flows drop
Stewart IT, Cayan DR, Dettinger MD, 2005: Changes toward earlier streamflow timing across western North America, J. Climate, 18 (8): 1136-1155
Trends in Fractional
Streamflow
HH
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April 1 SWE (mm)
20th Century Climate “2020s” (+1.7 C) “2040s” (+ 2.25 C)
-3.6% -11.5%
-21.4% -34.8%
Changes in Simulated April 1 Snowpack
Canadian and U.S. portions of the Columbia River basin
(% change relative to current climate)
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+1.7 °C +2.3 °C
• Warming temperatures will increasingly stress coldwater fish in the warmest parts of our region– A monthly average air temperature of 68ºF (20ºC) has been used as an
upper limit for resident cold water fish habitat, and is known to stress Pacific salmon during periods of freshwater migration, spawning, and rearing
Temperature thresholds for coldwater fish in freshwater
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The Dalles Regulated, Median year at The Dalles
Wet has more volume Nov-May
Peak is slightly earlier, but similar
Base has noticeable more volume in Jul-Sep
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Average HydSim Outflows at the Dalles
0
50000
100000
150000
200000
250000
300000
350000
400000
Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep
Qout
The Dalles - Average Outflow - All Years
Base 2A-TC-45 Dry Case Wet Case
Note reduced summer flows
Early April drop attributed to reduction in Arrow outflows as defined by Treaty operations
Note significant increase in winter
flows
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Payne, J.T., A.W. Wood, A.F. Hamlet, R.N. Palmer, and D.P. Lettenmaier, 2004, Mitigating the effects of climate change on the water resources of the Columbia River basin, Climatic Change, Vol. 62, Issue 1-3, 233-256
Flood Control vs. Refill Balance between flood protection and reliability of refill
is crucial in the Columbia Basin. As peak flows move earlier in the year
► flood evacuation schedules may need to be revised • To protect against early season flooding • To begin refill earlier to capture the (smaller) spring
freshet. Model experiments (see Payne et al. 2004) have shown
that moving flood evacuation two weeks to one month earlier in the year helps mitigate reductions in refill reliability associated with streamflow timing shifts.
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Implications for Transboundary Agreements Canadian Snowpack is less sensitive to warming then in
U.S. portion of Columbia basin► Streamflow timing shifts will also be smaller in Canada.
Over the next 50 years or so, Canada will have an increasing fraction of the snowpack contributing to summer streamflow volumes in the Columbia basin.
These differing impacts in the two countries have the potential to “unbalance” the current coordination agreements, and will present serious challenges to meeting instream flows on the U.S. side.
Changes in flood control, hydropower production, and instream flow augmentation will all be needed.
Long-range planning is needed to address these issues.
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Other Implications of Climate Change
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Bulletin 17B Revision
• Previous Wording for “Climatic Trends:”► “There is much speculation about climatic changes. Available evidence indicates that major changes occur in time scales involving thousands of years. In hydrologic analysis it is conventional to assume flood flows are not affected by climatic trends or cycles. Climatic time invariance was assumed when developing this guide.”
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Bulletin 17B Revision
• Revised Wording for Climate Paragraph:► “There is much speculation about changes in flood risk over time. Available evidence indicates that major changes may be occurring over decades or centuries. While time invariance was assumed when developing this guide, where changes in climate and flood risk over time can be accurately quantified, the impacts of such changes should be incorporated in frequency analysis by employing time-varying LP3 parameters or using other appropriate and statistically justified techniques. All such methods need to be thoroughly documented and justified.”
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Dam Safety Implications
Changes to storm types and magnitudes
Changes to runoff characteristics
Changes to calculations of Probable Maximum Precipitations – Dew Point alterations
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Example Effects from Regional Precipitation Shifts
IPCC AR4 model CCSM3
► South regions drier during growing seasons, reducing agricultural productivity
► Extreme storms affect Central America and the Caribbean more than elsewhere
► Shifts in wet/dry seasonality
Graphic from Ganguly et al., (ORNL) produced for backing the QRD 2009. http://www.ornl.gov/knowledgediscovery/QDR/
2050 A1FI Drought Index
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LEARNING OBJECTIVES
Using the course manual, references and lecture notes, the student will be able to understand hydrologic and hydraulic aspects of dam safety program. After this presentation, the student will be familiar with concepts, terminology and inter-relationships between hydrologic, hydraulic and water management considerations essential in the engineering analysis associated with the administration of the USACE Dam Safety program.
QUESTIONS