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ENG6110 Coastal Engineering And Modelling

tag 1 Download 4 Pages / 947 Words tag 19-11-2020
  • Course Code: ENG6110
  • University: Griffith University
    icon is not sponsored or endorsed by this college or university

  • Country: Australia


Accurate prediction of design waves are essential when determining design data for coastal structures.
The safety of structures, as well as the possibility of developing an economic design, relies above all
on the reliability and accuracy of the underlying design data. The objectives of this project are:
1. Apply DHI MIKE 21 SW model to predict the design wave conditions using the provided design
wind conditions.
2. The impermeable rock groyne structure has a slope of 1 in 2.5 and is subjected to a design wave
condition (H10%) estimated by the MIKE 21 SW model. Using the Hudson formula, estimate the
weight of uniform-sized, rough angular armour stone (?s = 2650kg/m3
) required for the trunk and
the head of the structure.

Data Information
? The bathymetry data is in the pre-generated file of “CoastGC_bathy.mesh”.
? The domain has Northern, Southern and Eastern open boundaries. “Lateral boundary” applies
to all of them. The coastal structure toes is at (Easting 550000, Northing 6890000) with a water
depth of 8.80 m.
? A MIKE 21 SW model has been developed, calibrated and verified. The following model
parameters need to be applied:

o Time: No of time steps 100, Time step interval: 1800 s
o Basic equations: Fully spectral formulation and Instationary formulation
o Spectral discretization: 25 frequencies and 16 directions
o No water level and current variations
o Diffraction – no diffraction
o Energy transfer - Include quadruplet wave interaction
o Wave breaking – Specified gamma, constant, value = 0.8
o Bottom friction - D50 sand size is 0.0002 m
o White capping – no white capping
o Structure – no structure
o Initial condition - default JONSWAP fetch growth expression 
You should work individually and complete the requested tasks:

1. Establish a spectral wave model using the provided calibrated model parameters detailed above
2. Complete simulations with the design wind conditions and generate required wave output
3. Analyse the wave data including (i) the developed wave height/direction and period
distributions in the whole domain (ii) the wave characteristics (wave height, wave period, wave
direction) at the construction site (iii) the developed wave spectral parameter (DirectionFrequency) at the construction site
4. Determine the critical design wave and present its wave characteristic figures as analysed in 3.
5. Complete the design using the model predicted design conditions and given structure
6. Complete a report to your client detailed your modelling and design
The report must include:
? Introduction and background: Introduce the project and explain your model and design formula
briefly, and give the key model parameters applied
? Results: Display the simulation results in a clear and appropriate manner, i.e. all figure axes and
table columns must be properly labelled with the correct units, captions and brief explanation
are required for all figures.
? Discussion and conclusion: A brief analysis that summarises the data and draws some
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Total 4 pages

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