Accumulation of pressures that may cause hydrographic alterations and/or modification of sedimentation in the Canary Islands (EM CAN PRE Modification Sedimentation)
Description
The identification of areas that may potentially undergo sedimentation modification or hydrographic alterations has been carried out based on the following human pressures/activities:
- Port and defence infrastructure.
- Retention of water in reservoirs.
- Extraction of solids: exploitation of underwater deposits and port dredging.
- Artificial reefs and controlled sinking of wrecks.
- Dumping of dredged port material.
- Regeneration of beaches and creation of artificial beaches .
The analysis has been carried out through a semi-quantitative index, which takes into account the presence or proximity of the elements that can cause this type of impact. The selection of the cells for each of the pressures has been made according to the following criteria:
- Those containing an authorised place of dumping of dredged material.
- Those that are less than 500 m from an artificial or regenerated beach.
Those that are less than 100 m from some stretch of artificial coast.
Those that are less than 500 m from a port.
Those that contain some artificial reef.
- Those containing a heavily modified body of water declared under the WFD.
- Those less than 100 m from some stretch of eroded coastline.
The following formula has then been applied:
MODIFICATION SEDIMENTATION= 0,1*[artificial reef+ artificial or regenerated beaches] + 0,25*[dragged material] + 0,5*[artificial coast + ports] + 1*[highly modified water mass + eroded coast]
The following criteria have been used to classify the cells:
Very High: 2.11 to 2.25 / High: 1.51 to 2.1 / Medium: 0.61 to 1.5 / Low: 0.11 to 0.6 / Very Low: less than 0,1.
Resources
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http://remro.cedex.es/WebCepyc/Canaria/CAlteracionesHidrograficasMallado.rar |