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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>).
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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>.
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The data are stored as R data file (WQData_*.rds) in the subdrirectory “./DataOS/WQData/”.
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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.
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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()”). The data in the Oosterschelde is used to compare the model results with the observation with the visualization app.
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*Overview of the data (Chla, DIN and PON) for the location WALCRN2.*
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[top](Data)
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# Suspended solids
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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 2023. On average the total suspended matter concentrations in the Oosterschelde over the period 2000 - 2023 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>).
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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 31-dec-2023. On average the total suspended matter concentrations in the Oosterschelde over the period 2000 - 2023 was 8.8 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 (14.1 mg l<sup>-1</sup>), and lowest at the locations ZIJPE (5.0 mg l<sup>-1</sup>) and LODSGT (7.4 mg l<sup>-1</sup>).
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*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.*
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*Total Suspended Matter (TPM) concentrations in the Oosterschelde at the locations WISSKKE, LODSGT and ZIJPE from 2000 until 2023 (Top). In the lower figure boxplots per month are presented. The red line represents the average values.*
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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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```math
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TPM = 10 + 3.13 \cdot cos \left( \frac{2 \pi}{365.25} - 15 \right)
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TPM = 8.8 + 2.7 \cdot cos \left( \frac{2 \pi}{365.25} + 31.1 \right)
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```
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*Monthly-averaged TPM concentrations in the Oosterschelde over the period 2000 - 2019. The indicates the fitted cosine function.*
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*Monthly-averaged TPM concentrations in the Oosterschelde over the period 2000 - 2023. The indicates the fitted cosine function.*
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[top](Data)
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# Water Temperature
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Data on water temperature in the Oosterschelde is derived from [Rijkswaterstaat](https://waterinfo.rws.nl). The location "Marollegat", situated in the eastern part of the Oosterschelde (slightly east from location NIOZ_8) is selected since a relative complete timeserie is available for this location from January 1<sup>st</sup> 2000. From the data, daily averaged water temperature is calculated. For the days with missing data, the averaged data from NIOZ is used. The data are stored as R data file (WaterTemp_*.rds) in the subdrirectory “./DataOS/WQData/”.
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*Daily averaged water temperature in the Oosterschelde from January 2000 to December 2020.*
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*Daily averaged water temperature in the Oosterschelde from January 2000 to December 2023.*
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[top](Data)
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# Irradiation
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Data on irradiation are derived from the [KNMI](https://www.knmi.nl/nederland-nu/klimatologie/daggegevens). Since the location Wilhelminadorp (323) has a gap in the data (January 6<sup>th</sup> 2014 to December 15<sup>th</sup> 2017 is missing), data from the location Westdorpe (319) is used. The variable Q in the raw datafile from KNMI contains data on Global radiation [J cm<sup>-2</sup>]. The irradiation is converted into units of W d<sup>-1</sup>. The data are stored as an R-data file (LightWestdorpe_*.rds) in the directory "/DataOS/KNMI/"
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*Irradiation (W d<sup>-1</sup>) at the location Westdorpe. In the upper panel all data are plotted from January 1996 to February 2021. In the lower panel a detail is presented for the period January 2018 to February 2021.*
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*Irradiation (W d<sup>-1</sup>) at the location Westdorpe. In the upper panel all data are plotted from January 1996 to February 2024. In the lower panel a detail is presented for the period January 2021 to February 2024.*
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[top](Data)
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# Bathymetry
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| ... | ... | @@ -81,13 +81,13 @@ A bathymetric map of the Oosterschelde is used to calculate the volumes and dept |
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# Shellfish
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The three types of shellfish species (Cockles, Mussels and Oysters) have different distribution within the Oosterschelde. The cockles are restricted to the intertidal areas. Mussels are cultured at the mussel culture plots. Oysters are cultured at the culture plots and at the wild oyster beds.
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*Distribution of shellfish populations in the Oosterschelde. Cockles are restricted to the intertidal areas (khaki). Mussels are cultured at the mussel culture plots (blue) and oysters are present at the culture plots (orange) and the wild oyster beds (green).*
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The total biomass of mussels at the culture plots in the Oosterschelde is estimated from the auction data. The cockle biomass is based on the results of the [WOT survey](https://shiny.wur.nl/Schelpdiermonitor_Delta/). The estimation of the wild oyster biomass is based on [Jansen et al. (2019)](https://edepot.wur.nl/504079) at the stock of oysters at the culture plots is calculated from the landings.
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The total biomass of mussels at the culture plots in the Oosterschelde is estimated from the auction data. The cockle biomass is based on the results of the [WOT survey](https://shiny.wur.nl/Schelpdiermonitor_Delta/). The estimation of the wild oyster biomass is based on [Craeymeersch et al. (2024)](https://edepot.wur.nl/652537) at the stock of oysters at the culture plots is calculated from the landings.
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Raw data are processed by the file "Shellfish.R". Data is stored as R data file (Shellfish_*.rds) in the subdirectory “./DataOS/Shellfish/”.
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*Yearly variation of the total stock (million kg fresh weight) of mussels at culture plots (blue), cockles (khaki), wild oysters (orange) and cultured oysters (green) in the Oosterschelde.*
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[top](Data) |
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\ No newline at end of file |
