Accumulation of pressures that may cause the entry of nutrients (nitrogen and/or phosphorus) into the Levantino-Balear Demarcation (EM LEVA PRE Nutrients)
Description
In order to identify the areas with the highest contribution of nutrients in the Levantine-Balear Demarcation, a spatial analysis of the sources described in section 2.6. of the Analysis of Pressures and Impacts of the Demarcation has been carried out. Using 5 by 5 minute meshing, the following cells have been selected:
- Those less than 500 m from an authorised dumping site for dredged material
- Those that coincide with EMEP cells with higher nutrient loads (those that add up to 20% of the total pollution, starting the sum from highest to lowest)
- Presence of aquaculture facilities
- Presence of bateas polygons
- Those that are less than 2 km from the mouth of a river
- Those that are less than 5 km from a PRTR complex, both treatment plants and industrial facilities, which has an obligation to report by total nitrogen and/or total phosphorus
- Those less than 2 km from sewage treatment plants that do not have the obligation to report nutrient loads discharged according to the PRTR regulation
- Those that overlap with some coastal water body that does not achieve good status by phytoplankton in compliance with the WFD
- Those that are less than 2 km from a river that does not reach good status by phytoplankton in compliance with the WFD
- Those less than 2 km from any transitional water body that does not achieve good status by phytoplankton in compliance with the WFD
Once all the elements have been integrated, the index has been calculated using the following formula:
NUTRIENTS INDEX = 0.25*[Dregged material dumps + atmospheric depositions with high nutrient concentrations + WWTPs not reporting to PRTR + aquaculture facilities + shellfish baths] + 0.5* [rivers discharges] + 0.75*[rivers or transitional waters not reaching good status in phytoplankton + PRTR complexes reporting on nutrients] + 1*[coastal waters not reaching good status in phytoplankton]
The result is a mesh of probabilities of inputs of high nutrient loads. The values of the cells are classified according to the following criteria:
Very High: Major 2.5 / High: 1.25 to 2.5 / Medium: 0.5 to 1.25 / Low: 0.25 to 0.5 / Very Low: minor 0.25
Resources
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http://remro.cedex.es/WebCepyc/Levantino/LNutrientesMallado.rar |