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Data.md
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......@@ -7,7 +7,7 @@ The model makes use of several types of external data. Data is used either to se
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# 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.
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 WALCHRN2 in North Sea and STEENBGN and OESTDM 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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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.
The concentrations of WALCRN2, STEENBGN and OESTDM are used for the boundary concentrations at the North Sea, Krammersluizen and Bergse Diepsluis, 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.
![WQ_Data_WALCRN2](uploads/f6f66ef51b19fa70b185ea18f561af20/WQ_Data_WALCRN2.png)
*Overview of the data (Chla, DIN and PON) for the location WALCRN2.*
[top](Data)
# Suspended solids
Data on total suspended matter (TPM) are derived from [Rijkswaterstaat](https://waterinfo.rws.nl) (see above). Data is selected from the locations Wissenkerke, Lodijkse Gat and Zijpe from 1-jan-2000 to 2019. On average the total suspended matter concentrations in the Oosterschelde over the period 2000 - 2019 was 9.0 mg l<sup>-1</sup> but is highly variable, depending on environmental conditions such as storms. On average the TPM values were highest at the location Wissenkerke (14.2 mg l<sup>-1</sup>), and lowest at the locations Zijpe (5.1 mg l<sup>-1</sup>) and Lodijkse Gat (7.6 mg l<sup>-1</sup>).
Data on total suspended matter (TPM) are derived from [Rijkswaterstaat](https://waterinfo.rws.nl) (see above). Data is selected from the locations WISSKKE, LODSGT and ZIJPE from 1-jan-2000 to 2019. On average the total suspended matter concentrations in the Oosterschelde over the period 2000 - 2019 was 9.0 mg l<sup>-1</sup> but is highly variable, depending on environmental conditions such as storms. On average the TPM values were highest at the location WISSKKE (14.2 mg l<sup>-1</sup>), and lowest at the locations ZIJPE (5.1 mg l<sup>-1</sup>) and LODSGT (7.6 mg l<sup>-1</sup>).
![TPM_Oosterschelde](uploads/344117f4599f94d08780c5d56df5fac2/TPM_Oosterschelde.png)
*Total Suspended Matter (TPM) concentrations in the Oosterschelde for the locations Wissenkerke, Lodijkse Gat and Zijpe from 2000 until 2019 (Top). In the lower figure boxplots per month are presented. The red line represents the average values.*
*Total Suspended Matter (TPM) concentrations in the Oosterschelde for the locations WISSKKE, LODSGT and ZIJPE from 2000 until 2019 (Top). In the lower figure boxplots per month are presented. The red line represents the average values.*
The monthly-averaged values show that the TPM concentrations are higher in the winterperiod than in the summerperiod. A cosine function is fitted through the monthly average values to derive a generic function of the TPM values throughout the year in the Oosterschelde.
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