spatiotemporal modelling of nitrate and phosphorus in river catchments for england and wales claire...
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![Page 1: Spatiotemporal Modelling of Nitrate and Phosphorus in River Catchments for England and Wales Claire Miller 1, Ana-Maria Magdalina 1, Adrian Bowman 1, Marian](https://reader035.vdocument.in/reader035/viewer/2022062417/5515caaa550346c6278b47ac/html5/thumbnails/1.jpg)
Spatiotemporal Modelling of Nitrate and Phosphorus in River Catchments for England and Wales
Claire Miller1, Ana-Maria Magdalina1, Adrian Bowman1, Marian Scott1, Duncan Lee1, Robert Willows2, Chris Burgess2 and Linda
Pope2
1Statistics, University of Glasgow2Environment Agency of England & Wales
![Page 2: Spatiotemporal Modelling of Nitrate and Phosphorus in River Catchments for England and Wales Claire Miller 1, Ana-Maria Magdalina 1, Adrian Bowman 1, Marian](https://reader035.vdocument.in/reader035/viewer/2022062417/5515caaa550346c6278b47ac/html5/thumbnails/2.jpg)
Data – England and Wales (E&W)
Objective:To investigate the overall pattern of nutrient concentrations in E&W river surface waters over the past 20-30 years.
Response: Total Oxidised Nitrogen
(log transformed and non-detects
imputed)
River catchment: Large Hydrological Areas (59 units)
LHA 22 Coquet-Wansbeck Blyth
![Page 3: Spatiotemporal Modelling of Nitrate and Phosphorus in River Catchments for England and Wales Claire Miller 1, Ana-Maria Magdalina 1, Adrian Bowman 1, Marian](https://reader035.vdocument.in/reader035/viewer/2022062417/5515caaa550346c6278b47ac/html5/thumbnails/3.jpg)
Additive Model
Additive model to investigate temporal and spatial trends and
seasonality and incorporating space-time interactions:
).,,().,(
)().(),()log(
54
3210
dayyearNorthingEastingmdayyeardoym
doymdayyearmNorthingEastingmTON
![Page 4: Spatiotemporal Modelling of Nitrate and Phosphorus in River Catchments for England and Wales Claire Miller 1, Ana-Maria Magdalina 1, Adrian Bowman 1, Marian](https://reader035.vdocument.in/reader035/viewer/2022062417/5515caaa550346c6278b47ac/html5/thumbnails/4.jpg)
TON for Coquet, Wansbeck, Blyth LHA in the NE (1994 - 2009)
The plot highlights the adjustments that should be added to the main effect for season at particular time points.
trend seasonality
Interaction between day and year
![Page 5: Spatiotemporal Modelling of Nitrate and Phosphorus in River Catchments for England and Wales Claire Miller 1, Ana-Maria Magdalina 1, Adrian Bowman 1, Marian](https://reader035.vdocument.in/reader035/viewer/2022062417/5515caaa550346c6278b47ac/html5/thumbnails/5.jpg)
time and space interaction
The movie highlights the spatial adjustments that should be added to the main effect for space at particular time points.
Easting
Nor
thin
g
Spatial Trend
Interaction between space and time
TON for Coquet, Wansbeck, Blyth LHA in the NE (1994 - 2009)