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Data.md
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_Under construction_
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The model makes use of several types of external data. Data is used either to set the boundary conditions for the model or to validate the model results. The data are updated regularly.
[top](Data)
# Water quality
Data on water quality is derived from [Rijkswaterstaat](https://waterinfo.rws.nl). From the category nutrients and eutrophication: all parameters are selected and from the category veldparameters-OW the concentration of Chl-a is selected. For the locations, all stations in Oosterschelde are selected and the stations Walcheren 2 in North Sea and Steenbergen and Oesterdam in Volkerak Zoommeer. For the water temperature, the measurements from Rijkswaterstaat for the location Marollegat is used.
# Nutrients
Data on nutrients are derived from [Rijkswaterstaat](https://waterinfo.rws.nl). From the category nutrients and eutrophication: all parameters are selected and from the category veldparameters-OW the concentration of Chl-a is selected. For the locations, all stations in Oosterschelde are selected and the stations Walcheren 2 in North Sea and Steenbergen and Oesterdam in Volkerak Zoommeer. For the water temperature, the measurements from Rijkswaterstaat for the location Marollegat is used.
![WQstations_28Comp](uploads/87b614de9cb20a31213260180c77eb04/WQstations_28Comp.png)
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Data are downloaded (all nutrient and eutrophication parameters and chlorophyll-a) for all locations within the Oosterschelde, the location Walcheren 2 km, Steenbergen and Oesterdam and stored as *.csv file in the directory “./rawdata/WQData/Waterinfo/”.
Parameters included in the files are included in the file:
- Chla: chlorofyll-a concentration [µg l<sup>-1</sup>];
- NH4: ammonium concentration in the water [mg-N l<sup>-1</sup>];
- NO2: nitrite concentration in the water [mg-N l<sup>-1</sup>];
- NO3: nitrate concentration in the water [mg-N l<sup>-1</sup>];
- NO2NO3: sum of nitrate and nitrite concentration in the water [mg-N l<sup>-1</sup>];
- Ntot: total nitrogen in the water, dissolved, particulate or total [mg-N l<sup>-1</sup>];
- NH<sub>4</sub>: ammonium concentration in the water [mg-N l<sup>-1</sup>];
- NO<sub>2</sub>: nitrite concentration in the water [mg-N l<sup>-1</sup>];
- NO<sub>3</sub>: nitrate concentration in the water [mg-N l<sup>-1</sup>];
- NO<sub>2</sub>NO<sub>3</sub>: sum of nitrate and nitrite concentration in the water [mg-N l<sup>-1</sup>];
- N<sub>tot</sub>: total nitrogen in the water, dissolved, particulate or total [mg-N l<sup>-1</sup>];
- KjN: sum of organic N and NH3 in the water [mg-N l<sup>-1</sup>];
- Ptot: total nitrogen in the water, dissolved, particulate or total [mg-P l<sup>-1</sup>];
- PO4: total ortho-phosphate concentration in the water [mg-P l<sup>-1</sup>];
- SO4: total sulphate concentration in the water [mg-S l<sup>-1</sup>].
- P<sub>tot</sub>: total nitrogen in the water, dissolved, particulate or total [mg-P l<sup>-1</sup>];
- PO<sub>4</sub>: total ortho-phosphate concentration in the water [mg-P l<sup>-1</sup>];
- SO<sub>4</sub>: total sulphate concentration in the water [mg-S l<sup>-1</sup>].
The data are read and processed with the R-script “WQData_RWS.R” that is located in the subdirectory “./Preprocessing/”.
Not all components are measured at all stations over the whole period. The nitrogen components and chlorophyll-a concentration are used to calculate dissolved inorganic nitrogen (DIN), particulate organic nitrogen (PON) and Chla.
- Missing data in NO2NO3 are supplemented from the sum of NO2 and NO3;
- Missing data in NO<sub>2</sub>NO<sub>3</sub> are supplemented from the sum of NO<sub>2</sub> and NO<sub>3</sub>;
- Missing are supplemented by calculation from based on location-specific linear regression functions;
- Missing values particulate organic nitrogen (PON) are supplemented by the difference between Kjeldahl N (KjN) and NH4;
- Dissolved inorganic nitrogen (DIN) is calculated from the sum of NO2NO3 and NH4
- Missing values particulate organic nitrogen (PON) are supplemented by the difference between Kjeldahl N (KjN) and NH<sub>4</sub>;
- Dissolved inorganic nitrogen (DIN) is calculated from the sum of NO<sub>2</sub>NO<sub>3</sub> and NH<sub>4</sub>.
Dissolved inorganic nitrogen (DIN) and particulate organic nitrogen (PON) are expressed in mmol-N m<sup>-3</sup> by dividing by the molecular weight of nitrogen (14 g mole-1) and multiplying by 1000 (l m<sup>-3</sup>).
Additionally, NIOZ measured nutrients (NO3 and particulate organic nitrogen) and chlorophyll-a at 8 locations ((NIOZ_1 to NIOZ_8)) in the Oosterschelde from 1995 to 2013. The data are combined with the data from Rijkswaterstaat. Finally, negative values for PON are set to 0 and for the stations in the Oosterschelde, the concentration of particulate organic nitrogen is set to a maximum of 30 mmol-N m<sup>-3</sup>.
Dissolved inorganic nitrogen (DIN) and particulate organic nitrogen (PON) are expressed in mmol-N m<sup>-3</sup> by dividing by the molecular weight of nitrogen (14 g mole<sup>-1</sup>) and multiplying by 1000 (l m<sup>-3</sup>).
Additionally, NIOZ measured nutrients (NO<sub>3</sub> and particulate organic nitrogen) and chlorophyll-a at 8 locations ((NIOZ_1 to NIOZ_8)) in the Oosterschelde from 1995 to 2013. The data are combined with the data from Rijkswaterstaat. Finally, negative values for PON are set to 0 and for the stations in the Oosterschelde, the concentration of particulate organic nitrogen is set to a maximum of 30 mmol-N m<sup>-3</sup>.
The data are stored as R data file (WQData_*.rds) in the subdrirectory “./DataOS/WQData/”.
The concentrations of WALCRN2 and STEENBGN are used for the boundary concentrations at the North Sea and Krammersluizen, respectively (function “Boundary_NPZ()”). For the location WALCRN2 data of PON is only available from the webserver until December 31<sup>st</sup> 2018. The data in the Oosterschelde is used to compare the model results with the observation with the visualization app.
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