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How does salinity change from the river end to the sea end of a vertically homogeneous estuary?

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Diagram showing four main types of estuaries: salt wedge, partially mixed, vertically homogeneous, and fjord. Each panel illustrates river and seawater mixing patterns, with arrows indicating the direction of saltwater and freshwater flow. — estuary Four main types of estuaries: (A) salt wedge estuary, (B) partially mixed estuary, (C) vertically homogeneous estuary, and (D) fjord (black arrows indicate salt water and white arrows fresh).

In a vertically homogeneous estuary, the salinity levels remain nearly uniform from the surface to the bottom at any specific location due to strong tidal currents that produce total mixing.12

Regarding the horizontal distribution, the salinity is lowest at the river end (where the river enters the estuary) and increases progressively toward the sea end.1