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--- wiki:nitrogen_removal_2 [2018/07/11 14:43] – sebastian
+++ wiki:nitrogen_removal_2 [2018/07/17 16:41] – eurac
@@ Line 1: / Line 1: @@
-==== Filtration of surface water by ecosystem types - Flow ====
+====== Filtration of surface water by ecosystem types - Flow ======
-<font 14px/inherit;;inherit;;inherit>**General description:**</font>
+==== General description ====
-InVEST “Nutrient Delivery Ratio (NDR)” model, specifically focusing on nitrogen. The model uses a mass balance approach, which describes the movement of a mass of nutrients through space. Unlike more sophisticated nutrient models, the present approach does not represent the details of the nutrient cycle but rather represents the long-term, steady-state flow of nutrients through empirical relationships. A detailed description of the model can be found at[[http://data.naturalcapitalproject.org/nightly-build/invest-users-guide/html/ndr.html</font|: http://data.naturalcapitalproject.org/nightly-build/invest-users-guide/html/ndr.html</font]]>
+InVEST “Nutrient Delivery Ratio (NDR)” model, specifically focusing on nitrogen. The model uses a mass balance approach, which describes the movement of a mass of nutrients through space. Unlike more sophisticated nutrient models, the present approach does not represent the details of the nutrient cycle but rather represents the long-term, steady-state flow of nutrients through empirical relationships. A detailed description of the model can be found at[[http://data.naturalcapitalproject.org/nightly-build/invest-users-guide/html/ndr.html|://data.naturalcapitalproject.org/nightly-build/invest-users-guide/html/ndr.html]]
-<font 14px/inherit;;inherit;;inherit>**__Input Data__ **</font>
+==== Input Data ====
-  * <font 14px/inherit;;inherit;;inherit>Land use map</font>* <font 14px/inherit;;inherit;;inherit>Biophysical table with data on specific coefficients regarding Land cover/land use (LULC) type, nutrients and water (listed in Table 1 of this document).</font>* <font 14px/inherit;;inherit;;inherit>Nutrient runoff proxy, a raster dataset with the yearly average amount of precipitation</font>* <font 14px/inherit;;inherit;;inherit>LAU2 boundaries</font>
+  * Land use map
+  * Biophysical table with data on specific coefficients regarding Land cover/land use (LULC) type, nutrients and water (listed in Table 1 of this document).
+  * Nutrient runoff proxy, a raster dataset with the yearly average amount of precipitation
+  * LAU2 boundaries
-<font 14px/inherit;;inherit;;inherit>**__Calculation process__**</font>
+==== Calculation process ====
 <font 14px/inherit;;inherit;;inherit>**(1) Prepare Input data for InVEST NDR model**</font>
@@ Line 38: / Line 41: @@
 <font 14px/inherit;;inherit;;inherit>For all other LULC classes (i.e. urban fabric, forests…) the default values provided by InVEST were used.</font>
+<font 14px/inherit;;inherit;;inherit>**(3) Set the other watershed parameters and Run InVEST NDR model**</font>
+<font 14px/inherit;;inherit;;inherit>By running the NDR model, choosing the “**Calculate Nitrogen Retention**” option, the N load and N export per municipality are calculated. The model requires additional parameters that can be set before starting the calculation.</font>
+<font 14px/inherit;;inherit;;inherit>We used the following thresholds:</font>
+**Table 2: **Additional parameters required by the model
+|   \\  <font 14px/inherit;;inherit;;inherit>**Parameter**</font>|   \\  <font 14px/inherit;;inherit;;inherit>**Threshold**</font>|
+|   \\  <font 14px/inherit;;inherit;;inherit>Subsurface Maximum Retention Efficiency</font>|   \\  <font 14px/inherit;;inherit;;inherit>0.8</font>|
+|   \\  <font 14px/inherit;;inherit;;inherit>Subsurface Critical Length</font>|   \\  <font 14px/inherit;;inherit;;inherit>150</font>|
+|   \\  <font 14px/inherit;;inherit;;inherit>Threshold Flow Accumulation</font>|   \\  <font 14px/inherit;;inherit;;inherit>1000</font>|
+|   \\  <font 14px/inherit;;inherit;;inherit>Borselli k parameter</font>|   \\  <font 14px/inherit;;inherit;;inherit>2</font>|
+<font 14px/inherit;;inherit;;inherit>**(4) Calculate the amount of filtered nutrients per municipality**</font>
+<font 14px/inherit;;inherit;;inherit>The amount of nitrogen that is filtered in a municipality can be calculated from the outputs of the Nutrient Delivery Ratio model by subtracting the nitrogen exported per municipality from the total nitrogen load in the same area.</font>
+{{:en:20180117water_filtration_supply_flow.jpg?nolink&2357x1677}}
+{{:en:test_legens.jpg?nolink&500x297}}
+__Bibliography:__
+__JRC (2012). Nitrogen load gridded dataset for Europe on HSMU level. [[http://afoludata.jrc.ec.europa.eu/dataset/nutrient-load-n-and-p-europe-basis-hsmu|http://afoludata.jrc.ec.europa.eu/dataset/nutrient-load-n-and-p-europe-basis-hsmu]] ; \\
+accessed: 2017-12-07. __
+__Natural Capital Project (2017). Invest documentation.[[http://data.naturalcapitalproject.org/nightly-build/invest-users-guide/html/ndr.html|http://data.naturalcapitalproject.org/nightly-build/invest-users-guide/html/ndr.html]]; accessed: 2017-12-07. __
+__Norwegian Meteorological Institute (2016). Nitrogen deposition gridded dataset for years 2000-2015.[[http://www.emep.int/mscw/|http://www.emep.int/mscw/]]; accessed: 2017-12-07. __
+__Vries, W. d., Leip, A., Reinds, G., Kros, J., Lesschen, J., and Bouwman, A. (2011). Comparison of land nitrogen budgets for european agriculture by various modeling approaches. //Environmental Pollution//, 159:3254–3268.__
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