Geography

Question 1

Where is Omaha

Answer 1

80km north of Auckland.
East coast of Rodney District
Between cAPE rODNEY AND tAKATU pOINT

Question 2

What type of sand is at Omaha

Answer 2

medium sand (0.5-2mm diameter) on the ocean side and fine sand and silt ( less than 0.5mm) on the harbour side

Question 3

Where is the sand from

Answer 3

Volcanic rocks around Rotorua and Taupo, brought to here by Taupo

Question 4

What’s the direction of the longshore drift

Answer 4

From Te Kie point to the end of the spit, northward

Question 5

Whats a main feature in backshore zone

Answer 5

sand dune system having both native and exotic grasses

Question 6

Direction of ebb( when tide falls) tide and flood( tide rises)

Answer 6

Ebb goes south, flood goes north

Question 7

Direction of prevailing wind

Answer 7

West to South West

Question 8

When was the spit farmed

Answer 8

1930

Question 9

When was sand dredged from offshore zone and the amount

Answer 9

1942 to 1963, around 380,000m3

Question 10

When was the subdivison of house built and extended north and how many houses

Answer 10

1970, extended in mid 90s, around 1000 houses

Question 11

How many tourists visit per year

Answer 11

1 million

Question 12

5 reasons why sand is limited here

Answer 12

• Little is introduced by river
• Sand eroded during storms is deposited in an offshore bar and gradully return to beach
• Sand is moved to harbour entrance by flood tide and brought out of harbour into surf zone by ebb tide
• Little comes from river that drains the land
• Stretch of coast is sheltered so lost sand will not be replaced

Question 13

Effects of sand dredged

Answer 13

Hole created causing ebb tide current to go out to sea rather than back along the beach, spit gets shorter

Question 14

Effects of storm in 1978

Answer 14

Materials deposited in a bar, constructive waves cant return them

Question 15

List 4 coastal management strategies

Answer 15

• In 1970 400,000m3 dredged from harbour and placed on ocean side to replenish beach
• Three groynes were contructed
• dunes have been protected by fences and pedestrian walks, attempted to reduce rabbit population whih eats vegetation
• Dunes were planted with marram grass and pngao

Question 16

Two effects of the 3 groynes

Answer 16

• redirect falling tide flow to south rather than east

- capture sand drifting north along the beach