QUIZ 5

Select the odd on out

• Revetment

• Bulk head

• Groin

• Seawall

Select the most dominant variable in Hudson equation

• cot(alpha)

• K_D

• H

• gamma

Which of these is INCORRECT regarding Morrison equation

• Drag is dependent on cross sectional area of flow

• Drag always dominate over inertia effect

• Inertia is dependent on volume of added mass

• Drag and inertia is always out-of-phase

Which of these is INCORRECT about Morrison equation?

• Valid only for small D/L

• Valid only for large KC number

• Valid only if flow field is developed around the structure

• KC number depends on the ratio of D/H

Which of these is NOT important for large submerged structures?

• Wave breaking

• Wave pressure

• Inertia

• Drag

Which of these is INCORRECT?

• Breakwater is designed to undergo gradual failure

• Vertical breakwater on a mound is suitable for large water depth

• Submerged breakwater may be used for aesthetic reason

• Floating breakwater is most suitable for area with predominant long period wave

Which of this is INCORRECT about beach nourishment?

• Borrow with smaller median size is preferred

• Borrow with finer median size should be poorly sorted for best effect

• Overfill factor is required to produce the required volume on site

• Renourishment is important to replace loss sediment

Select the CORRECT statement:

• Tombolo is naturally formed in the lee of a breakwater

• Salient & tombolo are formed due to longshore drift accretion

• Salient magnitude is a function of the breakwater length

• Segmented breakwaters typically have gaps which are shorter than the breakwater length

Select the odd one out regarding groin:

• Groin creates erosion and accretion zone

• Groin is usually extend shoreward up to the limit of longshore transport

• Groin field is tapered to avoid downdrift erosion

• Groin field can be used along a bay to trap longshore transport

Which of these is a minor considerations for armor unit selection:

• Quarry stone or precast unit

• Specific gravity of material used

• Design wave exposure

• Allowable damage