Table 1 gives wave observations made from a pier on four days at a bay on the Atlantic coast. Fig. 1 shows the bay, its sheltering headlands and the positio...

Assessment: Geography 9230 | Paper 1 Mock 01 | Written Paper 1 Subject: Geography - 9230

Question 1 Report

9230-p1-coast-bay-wave-observer-7

Table 1 gives wave observations made from a pier on four days at a bay on the Atlantic coast. Fig. 1 shows the bay, its sheltering headlands and the position of the observer. The class wants to decide which day was most likely to produce destructive waves and rapid beach change.

DayWave height (m)Wave frequency (waves per minute)Swash distance (m)
Monday0.575.8
Tuesday1.6153.1
Wednesday0.786.2
Thursday1.3143.6

(a) Which day had the greatest wave height? [1]
(b) Draw a labelled sketch of a destructive wave approaching the beach. [2]
(c) Outline why destructive waves tend to remove sediment from a beach. [3]

Answer Details

(a) Tuesday [1] (b) Award [1] for a steep, high wave with close crests; [1] for stronger backwash than swash, labelled (c) High-frequency waves give little time for water to drain [1]; backwash is stronger than swash [1]; sediment is pulled down the beach / offshore [1]

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