Fig. 1 is an aerial-style diagram of a coastal salt marsh behind a barrier beach. A narrow tidal creek carries seawater into the marsh, where cordgrass and ...

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

Question 1 Report

9230-p1-coast-saltmarsh-realignment-11

Fig. 1 is an aerial-style diagram of a coastal salt marsh behind a barrier beach. A narrow tidal creek carries seawater into the marsh, where cordgrass and mud flats are visible. The landowner is considering allowing the marsh to expand rather than repairing an old embankment. This is a managed realignment proposal.

(a) Which material is most likely to settle on the sheltered mud flats: coarse shingle or fine silt? [1]
(b) Outline how a salt marsh can reduce the impact of storm waves. [2]
(c) Draw a labelled cross-section showing one effect of breaching the old embankment. [2]

Answer Details

(a) Fine silt [1] (b) Vegetation and shallow water create friction that reduces wave energy [1]; marsh stores floodwater / encourages deposition [1] (c) Award [1] for breach allowing seawater into land behind embankment; [1] for new intertidal mud flat / salt marsh shown or labelled.

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