Transcript No Slide Title

U.S. Army Corps of Engineers
Coastal Processes Modeling for
the Alaskan Coast
By Bruce Ebersole and Dr. Robert Jensen
Flood and Storm Protection Division
US Army Corps
of Engineers
Coastal and Hydraulics Laboratory - ERDC
Overview
Wave ClimateChukcki Sea
to Aleutians
Storm Water Level
Climate – West and
North Alaskan
Coasts
US Army Corps
of Engineers
Storm Vulnerability
and Shore Protection
Design
Wave ClimateBering Straits
to North Slope
Circulation Model of
Cook Inlet
Coastal and Hydraulics Laboratory - ERDC
Wave Climate Chukchi Sea to the
Aleutians
Delong Mt Terminal
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Hindcast done 1999-2001 using the WAM
model
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Design of improved Delong Mountain
Terminal
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1985-2002 wave hindcast (June thru
November each year)
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Time-varying ice cover considered
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15 Storms 1954-1983
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Validated with buoy deployed 2000 and
2001 off DMT; NDBC buoy 46035 in
US Army
Corps
Bering
Sea for entire hindcast
of Engineers
Coastal and Hydraulics Laboratory - ERDC
Wave Climate – Bering Straits to North Slope
Barrow
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Hindcast done 2003-2004 using WAM
Design of storm damage reduction
project at Barrow
1982-2003 wave climate (June thru
December each year)
Time-varying ice cover considered
30 Storms 1954-1981
Validated with Shell Oil buoy data;
Sep-Oct 1983 and Aug-Sep 1984
with Corps shallow water
USValidated
Army Corps
gage off Barrow - 2003 (have
of wave
Engineers
2004 wave data)
Coastal and Hydraulics Laboratory - ERDC
North and West Coast of Alaska Storm Water Levels
Beaufort and Chukchi
Sea Domain
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Storm water level hindcast done 2004-2005 using the
ADCIRC model (tide plus wind surge)
Design of Barrow project and vulnerability of western
Alaskan native communities
Approx 25 storms each domain, 6 overlapping
Storms from 1950s to 2003
Time-varying ice cover considered
Validation to tidal constituents and measured water
levels
Data saved for entire domain
US Army Corps
Stage-frequency curves for combined tide and surge
of at
Engineers
key sites
North Pacific Domain
Coastal and Hydraulics Laboratory - ERDC
Storm Vulnerability Assessment
and Shore Protection Project
Design (Barrow)
October 1963 storm
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Wave and water level hindcast data as input
Shallow water wave transformation (STWAVE)
Set-up, run-up, erosion computed with SBEACH
Frequency of extreme coastal water levels
Special Output Locations
from WAM - to STWAVE
US Army Corps
of Engineers
Coastal and Hydraulics Laboratory - ERDC
Tidal Circulation Model of Cook Inlet/Port of Anchorage
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US Army Corps
of Engineers
Modeling work done in 2002-2004
ADCIRC model applied in 2D-DI mode
Circulation patterns as cause for excessive shoaling at Port
of Anchorage
Extensive validation using NOAA water level and ADCP data
Coastal and Hydraulics Laboratory - ERDC
Ideas for Partnering in Technology Transfer/Product
Development
• Create web-accessible 20-yr wave climatology for northern and western
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coasts of Alaska + tools to meet stakeholder needs
Extend to full year hindcast for western Alaskan coast, and expand to
include southern Alaskan coast
Create web-accessible 50-yr storm wave and water level climate
database; with frequency-of-occurrence relationships + tools to meet
stakeholder needs
Annual climate and storm updates to the database
Extend hindcast looking back in time (improve look for patterns, cycles?)
Conduct threat assessment at native Alaskan communities using storm
wave and water level database + tools
Assessment done using simple wave transformation, set-up and run-up
computations or nearshore modeling approach (e.g. Barrow)
Provide web-based tools and guidance for conducting threat
assessments and evaluating shore protection design options
US Army Corps
of Engineers
Coastal and Hydraulics Laboratory - ERDC
Ideas for Interagency/Academia R&D Collaboration
• Repeat hindcast with future estimates of changing ice cover to
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examine changing storm damage threat
Examine potential for changing storm frequency to alter the
storm damage threat
Delve into the hindcast wave climate- knowledge “sleeps” in the
data
Impact of increased sediment loads into Cook Inlet, other inlets
and estuaries
Collaborate on technology advancement
• joint wave, surge/circulation, sedimentation, beach erosion
model development
• wave generation in rapidly turning wind fields
• wind momentum transfer into waves and 3-D circulation,
with and without partial ice cover, arctic air/sea temp
conditions
• beach erosion for gravel beaches, sandy cliffs, cliffs with
permafrost
• terrain effects on winds, waves and circulation
US Army Corps
of Engineers
Coastal and Hydraulics Laboratory - ERDC