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Service Description: Sediment retention
The InVEST sediment delivery module was used to produce the map across mainland Scotland. The model works at the spatial resolution of the input DEM raster but returns the output summarized at sub-catchment level. For each pixel the soil loss reaching the catchment outlet is calculated by the Universal Soil Loss Equation (USLE) as: USLE = R x K x LS x C x P where R is the rainfall erosivity, K is the soil erodibility factor, LS is the slope length-gradient factor, C is the crop/vegetation and management factor, P is the support practice factor. Sediments are routed through the landscape using the terrain model The following maps represent four different attribute of the same feature: • the ratio between the sediment actually exported from the catchment and the potential soil loss (USLE) in kg/ha • the ratio between the sediment retained in the catchment and the potential soil loss (USLE) in kg/ha • the percentile ranking of the sediment export • the percentile ranking of sediment retention These variables have discretised in 6 intervals. Because the slope parameter had a significant influence in the soil loss calculation, the steepest areas are highlighted as exporting more sediments. However the mitigating effect of measures such as stone dykes is not estimated due to lack of data.
Scotland Nitrogen retention The InVEST Nitrogen retention module was used to produce the map for mainland Scotland. The model calculates the amount of nutrient retained on every pixel and sums nutrient export and retention per sub-watershed. Using the water routing process the model returns the nitrogen loading that reach the stream aggregates to the sub-watershed level. The map is characterized by 4 different attributes: • ratio between the loading value and the nutrient exported from the sub-watershed • ratio between the loading value and the nutrient retained from the sub-watershed • the percentile ranking of the nutrient export per sub-watershed in kg/ha • the percentile ranking of the nutrient retention per sub-watershed in kg/ha. As in the sediment model, the attributes described above have been discretised in 6 classes to identify the best/worst nutrient retention areas.
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Spatial Reference:
27700
(27700)
Single Fused Map Cache: false
Initial Extent:
XMin: -124075.98380055143
YMin: 495730.546875
XMax: 648656.2220818015
YMax: 1254794.140625
Spatial Reference: 27700
(27700)
Full Extent:
XMin: 5721.7562999995425
YMin: 530200.3894999996
XMax: 470180.7254999997
YMax: 1220373
Spatial Reference: 27700
(27700)
Units: esriMeters
Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP
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Keywords: sediment,nutrient
AntialiasingMode: None
TextAntialiasingMode: Force
Supports Dynamic Layers: false
MaxRecordCount: 1000
MaxImageHeight: 2048
MaxImageWidth: 2048
Supported Query Formats: JSON, geoJSON
Supports Query Data Elements:
Min Scale: 0
Max Scale: 0
Supports Datum Transformation: true
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