QUIZ 3

Select the WRONG statement

• Cylindrical structure forces include drag and inertia

• Floating structures have relatively high transmission

• Rigid face structure has large reflection

• Large submerged structure is not sensitive to wave forces

Select the WRONG statement

• Past local experience is important to coastal engineering design

• Coastal structures using local materials is one of the approach to reduce overall construction cost.

• Aesthetic of coastal structures is generally not critical

• Monitoring works should be planned to facilitate early preventive action

Select the WRONG statement

• Composite breakwater usually comprise concrete crown on rubblemound

• Rubblemound breakwater can fail drastically

• Submerged breakwater is generally less effective in wave attenuation

• Shore attached breakwater can interfere with littoral transport

Select the WRONG statement about rubblemound breakwater

• Armor unit size is most dependent on design wave height

• The use of interlocking increases Kd value

• Failure can be defined as armour unit displacement

• Use of low face slope is not favourable due to wide breakwater base

Select the WRONG statement

• Toe protection is used to mitigate scour

• Jetties are used to facilitate tidal flushing

• Groins are used to reduce onshore-offshore transport

• Breakwater length and distance from the shore affect beach sinuosity

Select the WRONG statement

• Groin field is tapered to mitigate flanking

• Detached breakwater must be even numbered

• Curve sea wall deflect wave energy to reduce impact

• Revetment is used to protect vulnerable shoreline

Select the WRONG statement

• Sediment bypassing is to prevent river mouth siltation

• Sediment bypassing may require mechanical pumping

• Dumping site of sediment may serve as a sand source

• Dredger must be operated conitnuously

Select the WRONG statement about beach nourishment

• Borrow material is preferably larger in size than native

• Borrow material can be from quarry

• Borrow material from offshore is usually to fine

• Volume of borrow material is usually higher than the actual volume required

Select the WRONG statement

• Beach nourishment must be replenished annually

• Loss of beach nourishment material can be mitigated using structures

• Beach nourishment will adapt to local hydrodynamic to form the final beach

• Beach nourishment

  material will be loss over long term

Select the WRONG statement

• Coastal structure crown level depends on design water level

• Coastal structure height depends on distance from shoreline

• Coastal structure length depends on shoreline to be protected

• Coastal structure volume depends on wave height