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Overview

Wave modeling for design of MRL-HSDRRS

MRL-HSDRRS design / overtopping calcs

Map of deficient areas

Overtopping along MRL-HSDRRS EB and WB

Katrina validation

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Slide 2

Wave Modeling in River

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Input Timeseries:Water Level (Depth)Wind Speed / Direction

Input Geometry:Fetch Length vs. Wind DirectionBatture Width and Elevation

Output Timeseries:Significant Wave Height Peak Wave Period

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Slide 3Slide 3

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Caernarvon

8/29/2005 08:00AM CDT

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Violet

English Turn at hwy 406 8/29/2005 09:00AM CDT

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Wave Statistics in RiverInputs:152 Storm Probabilities152 Wave Heights/Periods

Outputs:Wave Height – Frequency Curve Wave Period – Frequency Curve

1% Hs

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Slide 7Slide 7

We understand that in the case of the MRL design/analysis, USACE did not follow the same procedures that were used to design other parts of the HSDRRS. For example, it is our understanding that in all other perimeter parts of the HSDRRS, waves were applied simultaneously with maximum surge height, and they were applied perpendicular to the levee/structure. No attempt was made to link wave direction to wind direction and the temporal aspects of surge height. -Bob Turner SLFPA-E

STORM 001

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1% Significant Wave Height East and West

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1% Peak Wave Period East and West

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River Mile 81 to 89 on EB

1% Surge = 14.94 - 15.10 ft.1% Hs = 1.5 ft.1% Tp = 2.5 sec.1% Design El. = 18.0 ft

0.2% Surge = 17.86 - 18.10 ft

Final 1% Design = 18.5 ft

1% Surge = 14.94 - 15.10 ft.1% Hs = 1.5 ft.1% Tp = 3.5 sec.1% Design El. = 18.5 ft

0.2% Surge = 17.86 - 18.10 ft

Final 1% Design = 18.5 ft

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1% Design Elevations East and West

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Monte Carlo Based Overtopping Calcs

1% surge = 10.8 ft NAVD

1% std = 1.08 ft

- 1*std

+ 1*stdmean

1% Hs = 3.3 ft1% std = 10% of Hs

1% Tp = 3.5 sec1% std = 20% of Tp

10000 Samples:Compute OT rate for each sampleVan der Meer, Franco&Franco, Weir

Other variables:Crest elevation, slope,roughness factor, berm factor, wave angle factor, wall factor

Q50%Q90%

1%1%

1%

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1% and 0.2% Overtopping East Bank Existing Survey

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1% and 0.2% Overtopping East Bank MR&T

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1% and 0.2% Overtopping West Bank Existing Survey

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1% and 0.2% Overtopping West Bank MR&T

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1.0% 90% Overtopping with levees at existing survey

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1.0% 90% Overtopping with levees raised to MR&T

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0.2% 50% Overtopping with levees at existing survey

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0.2% 50% Overtopping with levees raised to MR&T