1 Why did it become necessary to extend the Tweed River breakwaters?
Answer: It was necessary to extend the tweed river breakwaters due to further sand build-up. Around that time, the longshore drift became longterm effects..
2 What impact would the construction of the breakwaters have had on the replenishment of sand to the Gold Coast beaches after severe storm erosion?
Answer: It would be better to replenish the sand to Gold coast beaches after severe storm erosion like sand from beaches being naturally supplied of sand.
3 Why did the Tweed River become unsafe to shipping? Explain the natural process that caused sandbars to form over the mouth of the Tweed River.
Answer: The sandbats were forming across the river mouth in the Tweed river and the tweed river became dangerous place.
4 Why was the dredging of the Tweed River and the associated beach nourishment program only a short-term solution to coastal management of the area?
Answer: It was only a short-term solution to coastal management as it was a expensive solution and one which would need to occur continually in order to maintain the sand supply to the beaches and
safety of the river entrances.
5 Describe the way the TRESBP replaces the natural process of longshore drift.
Answer: the sand was pumping from where it is accumulated on the Southern side of the Tweed river which it aims to replicate the natural process of longshore drift.
8 Look at the aerial photographs in 7.28. Describe the changes that have occurred to the mouth of the Tweed River since 1962.
Answer: The Mouth of the Tweed River has a fair amount of sand on it but not enough to become a major hazard but in 1969 a large amount of sand has appeared on the right side of the beach. However the amount of sand hasn't built up obviously in 1994.
9 Using the topographic map in 7.25 on page 164, estimate the length of the breakwater along the Tweed River entrance in 1962 and in 1994. *
Answer: There was only 100 - 200m in 1962 while it has been extended to 250m in 1994.
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