steven a. hughes. ph.d., p.e. - oas · • the surf-similarity parameter • runup no...
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Coastal Engineering Practice CommitteeCEM Preview
Steven A. Hughes. Ph.D., P.E.Coastal and Hydraulics Laboratory
US Army Engineer Research and Development Center
David R. Basco. Ph.D., P.E.Coastal Engineering Center
Old Dominion University
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Coastal Engineering Practice CommitteeCEM Preview
Overview of Wave Runup and Overtopping
Overview of Wave Reflection and Transmission
Example Problems
CEM Chapter VI-5-2 (Author: Hans F. Burcharth)CEM Chapter VI-7 (Author: David R. Basco)
Based on:
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Coastal Engineering Practice CommitteeCEM Preview
Wave Runup: Vertical distance between SWL and maximum water elevation
Wave Rundown: Vertical distance between SWL and minimum water elevation
Wave runup determines structure crest elevation for minimal overtopping condition
Important:
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Coastal Engineering Practice CommitteeCEM Preview
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Coastal Engineering Practice CommitteeCEM Preview
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Smooth Impermeable Slopes
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Coastal Engineering Practice CommitteeCEM Preview
Smooth Impermeable Slopes
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Coastal Engineering Practice CommitteeCEM Preview
Smooth Impermeable Slopes
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Alternate FormulationSmooth Impermeable Slopes
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Additional Factors
γγγγr - Influence of surface roughnessγγγγb - Influence of fronting bermγγγγh - Influence of shallow waterγγγγββββ - Influence of approaching wave angle
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Coastal Engineering Practice CommitteeCEM Preview
Impermeable Rock Slopes
Permeable Rock Slopes
Coefficients
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• The Surf-Similarity Parameter• Runup
No Overtopping-ImpermeableSmoothRoughPartial-Safety FactorsStatistical Distribution
No Overtopping-Permeable• Overtopping
Average Discharge Rate• Summary CEM-vs-SPM
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SUMMARY: WAVE RUNUPSUMMARY: WAVE RUNUP
1. Significant Wave 1. Significant Wave RunupRunup, , RRusus
•• Both SPM (1984) and CEM (2000) give Both SPM (1984) and CEM (2000) give similar resultssimilar results
•• CEM (2000) methods easy for EXCELCEM (2000) methods easy for EXCEL
2. Prevent overtopping 2. Prevent overtopping -- Statistical distributionsStatistical distributions•• RuRu2%2% based on actual, largebased on actual, large--scale tests, scale tests,
irregular wavesirregular waves•• Estimates of Estimates of RuiRui% based on % based on Rayleigh Rayleigh
distribution are incorrectdistribution are incorrect
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SUMMARY: WAVE RUNUPSUMMARY: WAVE RUNUP
3. Permeable Breakwaters3. Permeable Breakwaters•• Little data in SPM (1984)Little data in SPM (1984)•• Core permeability significantly influences Core permeability significantly influences
resultsresults•• Methods now available in CEM (2000)Methods now available in CEM (2000)
Use CEM (2000) methods to estimate wave Use CEM (2000) methods to estimate wave runuprunup
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• Occurs where the highest runup levels exceed the freeboard• Unevenly distributed in space and time• Usually expressed as time-averaged overtopping discharge• Discharge from a single wave can be 100 times average
Definition of freeboard
Wave Overtopping...
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Critical AverageOvertoppingDischarges
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Coastal Engineering Practice CommitteeCEM Preview
Generally expressed in the form...
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Coastal Engineering Practice CommitteeCEM Preview
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Typical CEM Table(one of six)
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SUMMARY: WAVE OVERTOPPINGSUMMARY: WAVE OVERTOPPING
1. Average wave overtopping rate1. Average wave overtopping rate•• Both SPM (1984) and CEM (2000) give Both SPM (1984) and CEM (2000) give
similar resultssimilar results•• CEM (2000) methods easy for EXCELCEM (2000) methods easy for EXCEL
2. Critical values for traffic and structural safety2. Critical values for traffic and structural safety•• SPM (1984) gives no informationSPM (1984) gives no information•• CEM (2000) gives critical values to justify CEM (2000) gives critical values to justify
raising crest elevationraising crest elevation
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SUMMARY: WAVE OVERTOPPINGSUMMARY: WAVE OVERTOPPING
3. Volume estimates for individual waves3. Volume estimates for individual waves•• CEM (2000) gives methodsCEM (2000) gives methods
Use CEM (2000) methods to estimate wave Use CEM (2000) methods to estimate wave overtoppingovertopping
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Coastal Engineering Practice CommitteeCEM Preview
Overview of Wave Runup and Overtopping
Overview of Wave Reflection and Transmission
Example Problems
Based on: CEM Chapter VI-5-2 (Author: Hans F. Burcharth)CEM Chapter VI-7 (Author: David R. Basco)
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Bulk Reflection Coefficient
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Coastal Engineering Practice CommitteeCEM Preview
Structure a bSeelig Equation
With
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Six other cases are given
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Transmission Coefficient
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Coastal Engineering Practice CommitteeCEM Preview
Van der Meer andd’Angremond (1991)
• Conventional • Low-crested• Reef breakwaters
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Coastal Engineering Practice CommitteeCEM Preview
Overview of Wave Runup and Overtopping
Overview of Wave Reflection and Transmission
Example Problems
Based on: CEM Chapter VI-5-2 (Author: Hans F. Burcharth)CEM Chapter VI-7 (Author: David R. Basco)
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Figure V-3-6
Virginia Beach seawall/boardwalk (a) artist’s perspective (b) aerial photo, 1997 (courtesy of Virginia Beach, VA)