Hydrodynamics (changed from natural)

Developments in the lower reaches of estuaries such as harbours, training walls, marinas and canal estates, together with climatic change, can affect the local patterns of waves, currents or tidal exchange. These alterations can contribute to the loss or degradation of intertidal habitats.

View a conceptual model of potential causes of a change to hydrodynamics and the condition responses observed as a result of this change.

Potential indicators

There are a number of causes and symptoms related to this stressor. The following indicators are recommended for the stressor ‘Hydrodynamics’:

Pressure indicators

Indicators of sources of changed hydrodynamics:

  • Dredging acitivies in river system
  • Presence of entrance modifications
  • Presence of canals
  • Percentage of estuarine ‘shoreline’ length modified
  • Presence of original estuary length lost due to a tidal barrage

Indicators of direct pressure:

  • None

Vulnerability indicators

  • Mean spring tidal range

Condition indicators

Physical-chemical condition indicators:

  • None

Biological condition indicators:

  • None
Possible causes Possible symptoms
The actions/events/situations that might induce this stress: The actions/events/situations that might arise from a change to the stressor:

Fact sheets on background science and economics




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