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OCE421 Marine Structure Designs

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OCE421. Marine Structure Designs. Lecture 1. Fall, 2006. OCE421: Marine Structure ... U.S. Army Corps of Engineers, (1984) Shore Protection Manual, Vol.1 and 2, ... – PowerPoint PPT presentation

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Title: OCE421 Marine Structure Designs


1
OCE421 Marine Structure Designs
  • Lecture 1
  • Fall, 2006

2
OCE421 Marine Structure Designs, Fall 2006
  • Prerequisite OCE307
  • Instructor Dr. James Hu, Prof. in OE
  • Office Sheets Building, Rm. 220
  • Phone 874-6688
  • Email hu_at_oce.uri.edu
  • Class Hours M,W 200 -315 pm
  • Class Room Room 117, Sheets Building
  • Office Hours By appointment

3
Teaching Assistant
  • Mr. Nate Greene
  • Office Hours TBA
  • Office 202 Sheets

4
Mailing List
  • www/oce/uri/edu/
  • mailman/listinfo/oce421

5
Primary Textbook
  • U.S. Army Corps of Engineers, (1984) Shore
    Protection Manual, Vol.1 and 2, Vicksburg, MS
    Coastal Engineering Research Center. (it is now
    out-of-print)
  • Coastal Engineering Manual (CEM)
  • http//ocean.oce.uri.edu/cem/

6
Grading Policy
  • Homework Assignments 10
  • Mid-term Exam 30 (10/23/2006)
  • Quizzes 30
  • Project Report and Presentation 30

7
Homework Assignments
  • 5-6 homework assignments
  • No late homework accepted
  • Using MATLAB extensively

8
Project guideline, Fall 2006
  • 2-person or 3-person teams allowed
  • Project proposal due Nov. 1
  • Final report due Dec. 4
  • Presentation Dec. 6 and Dec. 11

9
Project proposal
  • must include
  • general statement (statement of problem)
  • design site description
  • proposed coastal structure
  • map and bathymetry plot near the design site
  • wave data base to be used

10
Final Project Report
  • must include
  • general statement (statement of problem)
  • design site description
  • proposed coastal structure
  • planning analysis
  • map and bathymetry plot near the design site
  • design wave and design water depth
  • complete structural design
  • cost analysis
  • alternative design and cost analysis
  • environmental impact analysis (optional)
  • concluding remarks

11
Effects of Water Waves
  • Waves are the major factor in
  • determining the geometry and composition of
    beaches
  • significantly influence the planning and design
    of harbors, waterways, shore protection measures,
    coastal structures, and other coastal works.

12
Physical Description of a water wave
  • its surface form
  • the fluid motion beneath the wave

13
Progressive/Standing Wave
  • A waveform which moves relative to a fixed point
    is called a progressive wave the direction in
    which it moves is termed the direction of wave
    propagation.
  • If a waveform merely move up and down at a fixed
    position, it is called a standing wave or a
    clapotis.

14
Oscillatory/Nearly Oscillatory Waves
  • Water waves are considered oscillatory or nearly
    oscillatory if the water particle motion is
    described by orbits that are closed or nearly
    closed for each wave period. The linear theory
    describes pure oscillatory waves.
  • Most finite-amplitude wave theories describe
    nearly oscillatory waves since the fluid is moved
    a small amount in the direction of wave advance
    by each successive wave. This motion is termed
    mass transport of the waves.

15
Wave Classification by Wave Period
  • One way to classify waves is by wave period, or
    the wave frequency. Of primary concern are
    gravity waves which have periods from 1 to 30
    seconds.
  • A narrower range of wave periods, from 5 to 15
    seconds, is usually more important in coastal
    engineering problems.

16
Gravity Waves
  • Surface tension forces may be neglected.
  • Gravity is the dominant restoring force.
  • Oscillatory water motion is the result of the
    interaction between gravity and inertia forces.

17
Seas and Swell
  • Gravity waves can be separated into two states
  • Seas - when the waves are under the influence of
    wind in a generating area, and
  • Swell - when the waves move out of the generating
    area and are no longer subjected to significant
    wind action.

18
Wave Parameters and Characteristics
  • A (simple) wave is completely specified by wave
    height, the water depth, and the wave period (or
    wave length).
  • Other characteristics of interest
  • Wave surface profile
  • Forward speed (celerity)
  • Particle velocities, accelerations, and motion
    paths
  • Dynamic pressure field
  • Kinetic and potential energy
  • Wave power and momentum flux

19
Monochromatic and Irregular Waves
  • Monochromatic waves a single (deterministic)
    wave height and period.
  • Irregular waves statistical (probabilistic)
    distribution of wave heights and periods and
    wave spectrum (wave power versus wave frequency)

20
Design Wave Conditions (for a specific location)
  • Various design requirements different types of
    design wave information are needed
  • Effective wave measurement, analysis, and
    prediction techniques are needed.
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