To compare coastal options, test each one against the stated aim and the stated limit, then choose the one that meets both. The reason must refer to the numbers and wording in the question.
This lesson is part of coastal processes and management. It uses the side effects explained in how a structure may change sediment distribution.
What goes in a comparison?
Use the same rows for every option. That makes the comparison fair and shows a marker you are following the question.
| Row | What to write |
|---|---|
| Aim | Does it do what the question asks? |
| Cost over the stated period | Add up repeats, not just the first cost |
| Limitation | One drawback, from the question or from the option |
| Verdict | Fits or does not fit, with the reason |
Worked example: an original road under threat
The aim in an original case is to protect 400 m of coastal road from waves. The limit is a budget of RM3 000 000 over 10 years. Three options are given.
| Option | Cost | Limitation |
|---|---|---|
| Sea wall | RM2 800 000, plus RM50 000 each year | Waves reflect and lower the beach in front |
| Beach nourishment | RM1 200 000, repeated every 5 years | Sand is lost again, so it must be repeated |
| Mangrove planting | RM600 000 once | Grows slowly, and suits only sheltered muddy shores |
Cost over 10 years. The sea wall: 2 800 000 + (10 × 50 000) = RM3 300 000, which is over the budget. Nourishment: two applications, at the start and at year 5, so 2 × 1 200 000 = RM2 400 000, which is within the budget.
Model sentence: “Beach nourishment fits the RM3 000 000 limit at RM2 400 000 over 10 years, whereas the sea wall reaches RM3 300 000. Its limitation is that the sand must be replaced, so the road stays protected only while the repeats continue.”
The mistake: choosing by strength alone
A common slip is to pick the sea wall because it is “strongest”. The working ignores the budget, and the choice fails the stated limit.
Another slip is to use the first cost only. RM2 800 000 looks cheaper than RM3 000 000 until the yearly upkeep is added.
Check yourself
An original village beach must be kept for tourism within RM1 500 000 over 10 years. Option X is groynes at RM900 000 once, with a limitation of starving the next beach. Option Y is nourishment at RM400 000 every 3 years, starting now. Which fits, and what limitation should you name?
Answer
Option Y is applied at years 0, 3, 6 and 9, which is 4 times: 4 × 400 000 = RM1 600 000, over the budget.
Option X costs RM900 000, within the budget.
Choose X, and name its limitation: the groynes may starve the beach down the coast, so the next stretch could narrow.
What to study next
Test all four coastal skills on the coastal processes practice set. You can also revisit distinguishing erosional and depositional landforms.
If you want a teacher to check your evaluation sentences against the marking scheme, see online one-to-one Geography tuition.