Accumulation of pressures that may cause hydrographic alterations and/or modification of sedimentation in the North Atlantic Demarcation (EM NOR PRE Modification Sedimentation)

Description

The identification of areas that can potentially undergo hydrographic alterations and, in many cases, modification of sedimentation is done based on the accumulation of the following human pressures/activities: - Port and defence infrastructure - Retention of river flow in reservoirs and other regulatory infrastructure - Extraction of solids: exploitation of underwater deposits and port dredging - Artificial reefs and controlled sinking of wrecks - Dumping of dredged port material - Beach regeneration and creation of artificial beaches - Mussel growing bats The analysis has been carried out through a semi-quantitative index, which takes into account the presence or proximity of 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 a landfill of dredged material - Those containing some sand extraction point - 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 containing a sunken ship - Those containing some artificial reef - Those containing a bat - Those that are less than 2 km from the mouth of a river with hydrological alteration - Those containing a heavily modified body of water declared under the WFD - Those that are less than 100 m from some stretch of eroded coast The following formula has then been applied: MODIFICATION OF SEDIMENTATION= 0,1*[sunken vessel + artificial reef] + 0,25*[dragged material + sand extraction + artificial or regenerated beaches + baths] + 0,5*[artificial coast + ports + rivers with hydrological alteration] + 1*[highly modified water mass in application of WFD + eroded coast] The classification of the cells is based on the following criteria: Very High: 3 to 4 / High: 2.2 to 3 / Medium: 1.5 to 2.2 / Low: 0.5 to 1.5 / Very Low: less than 0.5

Resources

Name Format Description Link
0 http://remro.cedex.es/WebCepyc/Noratlantica/NAlteracionesHidrograficasMallado.rar

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  • ENVI

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