los angeles district los angeles district 86 th cerb 3-4 june 2009 los angeles district activities...
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Los Angeles DistrictLos Angeles District
86th CERB3-4 June 2009
Los Angeles District Activities and Data UtilizationArthur T. Shak, SPL
•Navigation•Shore Protection (HSDR)•Ecosystem Restoration•Multi-Purpose
•Planning•Regional Studies•Design•Construction•Operations•Maintenance•Regulatory
Los Angeles DistrictLos Angeles District
SPL COASTAL PROJECTS
•Coastal Studies (14)
•Regional Studies (3)
•State-wide Sediment Master Planning
•Harbors (14, 4 deep-draft)
•Beach Nourishment Projects (3)
Los Angeles DistrictLos Angeles District
DATA UTILIZATION
• Tides and Water Levels
• Waves
• Topography and Hydrography
Los Angeles DistrictLos Angeles District
LONG TERM TIDE RECORDS
Los Angeles DistrictLos Angeles District
Los Angeles DistrictLos Angeles District
Los Angeles DistrictLos Angeles District
Los Angeles DistrictLos Angeles District
Los Angeles DistrictLos Angeles District
INTERANNUAL VARIATIONS IN MONTHLY MEAN SEA LEVELS
1982-83 1997-98
Los Angeles DistrictLos Angeles District
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
2000 2010 2020 2030 2040 2050 2060 2070 2080 2090 2100
Year
MS
L r
ise
(ft)
Historic
ACCELERATED-LOW NRCCurve I
ACCELERATED-HIGH NRCCurve III
FUTURE SEA LEVEL RISE
La Jolla Tide Gage
• Relative to 1983-2001 MLLW tidal epoch.
• 1997-98 ENSO already ½ foot above normal sea levels.
• Typical economic evaluation period of 50-years.
Los Angeles DistrictLos Angeles District
STORM SURGE AND TIDEMarch 1983
LA Hbr Mar 1983
-2.00
-1.00
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
2/23/1983
2/25/1983
2/27/1983
3/1/1983
3/3/1983
3/5/1983
3/7/1983
3/9/1983
3/11/1983
3/13/1983
3/15/1983
Date
Ac
tu
al
Tid
e &
De
lta
(ft)
Vrfy HH DELTA (Actual - Predicted)
Los Angeles DistrictLos Angeles District
WAVES
Los Angeles DistrictLos Angeles District
Los Angeles DistrictLos Angeles District
GROW DATA from Gpt 38190 1/1/1970 to 12/31/2005 transformed to nearshore locations to create 35-year hindcast.
Los Angeles DistrictLos Angeles District
Los Angeles DistrictLos Angeles District
LOS ANGELES COUNTYSPATIAL
VARIATION IN
EXTREME
WAVE
HEIGHTS
Los Angeles DistrictLos Angeles District
LIFE CYCLE ANALYSIS• MONTE CARLO SIMULATION OVER PROJECT PERIOD.
• ENSO CORRELATES WITH ELEVATED WATER LEVELS AND ABOVE AVERAGE NUMBER OF EVENTS.
• PHASING WITH SPRING TIDE LARGE DETERMINANT.
• SEASONAL AND SHORT TERM SHORELINE RESPONSE HIGHLY VARIABLE.
• USE OF SYNTHETIC WAVE CLIMATES APPLIED.
• RUNUP AND OVER-TOPPING OVER NATURAL AND PROTECTED PROFILES IS CAUSE OF COASTAL FLOODING (at most SPL sites).
Los Angeles DistrictLos Angeles District
Topo and Hydro Data
Encinitas and Solana Beach Feasibility
•LIDAR and CHARTS to map bluff and infrastructure offsets.
•SANDAG multibeam and sea floor mapping used in environmental impact analysis.
•Coast of CA, SANDAG and City Sponsored beach profiling used for analysis of sand distribution in cross-shore dimension.
Los Angeles DistrictLos Angeles District
Topo and Hydro Data
Mission Bay Middle Jetty Repair Included in 2009 ARRA.
Missing seaward 200 feet, as of Apr 2009 LIDAR.
2004 CHARTS survey showed 150 feet missing.
Los Angeles DistrictLos Angeles District
2009 ARRA Repairs toMission Bay Middle Jetty
Los Angeles DistrictLos Angeles District
2008 APR 12
2009 MAR 08
Southern California Beach Processes Study (SCBPS) LIDARof Mission Bay Middle Jetty
2006 OCT 21
Los Angeles DistrictLos Angeles District
2009 ARRA Repairs toMission Bay Middle Jetty
• Regional High resolution LIDAR readily available.
• Difficult to predict, budget and schedule data need.
• In the “can” products facilitates rapid response with less guessing.
Los Angeles DistrictLos Angeles District
Los Angeles District
Field Trip 1330 – Leave Hotel (Lunch
provided on Bus)
1400 – 1430 Tour and Presentation by Scripps of San Elijo Lagoon Mouth
1445 – 1530 Tour and Presentation by Solana Beach, Encinitas, Scripps and Corps of Solana Beach
1600 – 1645 Tour and Presentation by Scripps of Torrey Pines State Reserve
1715 - Return to Hotel
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