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River network CCM

See in CCM and CCM2 download and load

The CCM v2.1 (Catchment Characterisation and Modelling), is a European hydrographical database based on a topographic model (Vogt et al., 2007, ​http://ccm.jrc.ec.europa.eu/). The CCM2 database includes a hierarchical set of river stretches and catchments based on the Strahler order, a lake layer and structured hydrological feature codes based on the Pfafstetter system (De Jager et al., 2010). The primary catchment unit is the drainage area – this is the smallest entity in this hierarchy and is drained by CCM river stretch. This system allows the identification of all upstream catchments and all river stretches downstream of a given point along the river network. All the river stretches are connected.

See = OriaEda for CLC, Dams impact, electrofishing sampling

Corine Land Cover

See Corine Land Cover
For POSE, we used the pan-European land cover and land-use classification CORINE (Co-Ordination of Information on the Environment, CLC2006, 250m, version 12/2009) to provide land cover information in the analyses (European Commission, 1994). The data are obtained from the European Environment Agency website and are available at ​http://www.eea.europa.eu/data-and-maps/data/corine-land-cover-2000-clc2000-seamless-vector-database-1. For POSE, we grouped the 44 CORINE Land Cover classes into a simplified version with 3 groups (Table A2.1), to distinguish between low (no impact), medium (agricultural) and high (urban) impacts.

Table : Corine Land Cover grouped nomenclature.

3 groups	Levels in CLC
Urban	1.1 Urban fabric
1.2 Industrial, commercial and transport units
1.3 Mine, dump and construction sites
1.4 Artificial non-agricultural vegetated areas
Agricultural	2.1 Arable land
2.2 Permanent crops
2.4 Heterogeneous agricultural areas
No impact	2.3 Pastures
3.1 Forests
3.2 Shrub and/or herbaceous
3.3 Open spaces with little or no vegetation
4.1 Inland wetlands
4.2 Coastal wetlands
5.1 Inland waters
5.2 Marine waters

Joining CLC and CCM OriaEda

The percentage of each land use category is calculated for each river stretch drainage area, as well as for the area of catchment upstream of each stretch.

Dams impact

The obstacle pressure is characterised by the cumulative number of structures (dams and weirs) from the sea to the stretch, and the accumulation of scores for the passability of eel at each structure. These scores are based on the assessment criterion of the upstream passability from Steinbach (2009, modified from Steinbach, 2006), that weights different variables of dam construction (waterfall height, roughness, structure profile) using a scoring key that penalizes (+) or facilitates (-) an eel’s upstream passage.

System of projection

Each layer are in the same system of projection : ETRS-LAEA (ETRS89)
See srid to find the srid corresponding to each coordinates systems