Discussion
Match each estuary type with its characteristic.
List I
A. Salt wedge
B. Partially mixed
C. Well mixed
D. Inverse
List II
1. little vertical salinity variation
2. strong stratification with a sharp interface
3. salinity increasing landward through evaporation
4. some stratification with active mixing
Answer: A
Correct answer: A-2, B-4, C-1, D-3
Estuaries are classified by how far the fresh and salt water mix. A salt wedge estuary has strong river flow and weak tides, so a sharp interface persists with salt water wedging beneath. A partially mixed estuary has stronger tides and active mixing across a weaker gradient. A well mixed estuary is vertically uniform in salinity. An inverse estuary, in an arid climate, loses so much water to evaporation that salinity increases landward.
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