4b- economic development unintentionally causing change

Question 1

what economic activity is happening in Pikiri and why

Answer 1

sand mining at Pikiri to make concrete and glass for buildings. Its close Aukland - cheaper to transport and reduces carbon. Aukland has 1/3 of NZ population and 35% of GDP.

beach profile flattened

Question 2

unintentional impacts on the Mangarahwi spit

Answer 2

Less sediment is moved to the spit by LSD due to there being less sediment available down the coast- 28m eroded from the spit, 30 years ago the spit breached which led to flooding and the beach being eroded further

Question 3

unintentional impacts on Te Arai point and pakiri

Answer 3

this is the main sand mining area, the reduced sediment has lead to increasing wave energy as it doesnt slow the waves down-

sand is still extracted from pakiri, - 75,000 m3 per year

dunes are retreating making the beach profile flatter.

Reduced sediment starves landforms to the north so less sediment goes to the spit