Alteration of instream habitat

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Alteration of instream habitat

04. Morphological alterations

General description

Natural instream habitats offer refuge and shelter, food resources and spawning

grounds to aquatic biota. Recognition of instream habitat alteration should be based on changes in surface flow type, hydraulic attributes (flow depth, velocity and bed roughness, shear velocity, Reynolds and Froude numbers), channel morphology, and bed substrate calibre. Instream habitat degradation may be an effect of a hydrogeomorphological process (natural or caused by other pressures), or of a direct human activity (e.g. channel dredging, gravel bed extraction). The latter activities are those pressures we are refering to here.

Effect/Impact on (including literature citations)

  • HYMO (general and specified per HYMO element)
  • physico - chemical parameters
  • Biota (general and specified per Biological quality elements)

Case studies where this pressure is present

Possible restoration, rehabilitation and mitigation measures

Useful references

Other relevant information

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