extendsim-pcraster - spicosa · 2010-12-02 · extendsim –generic platform for dynamic simulation...
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18/11/2010
ExtendSim-PCRaster
A generic platform for spatial-dynamic modelling of
nutrient transport and policy options
Jean-Luc de Kok
Hans van der Kwast
Steven Broekx
Guy Engelen
18/11/2010 2© 2010, VITO NV
@2005..2007, PES PCRaster Environmental Software
Extending Systems Analysis with a
spatial component
» SA and system dynamics: Simulation of processes and
interactions
» GIS and spatial modeling: Describe locations and
patterns in the landscape
» Adding pattern to process
» Space is an important aspect of the processes in the landscape
» Describing development of processes and patterns
» PCRaster: a tool for developing spatial simulation
models
» WP 8.2: Link PCRaster to Extend
18/11/2010 3© 2010, VITO NV
WATER QUALITY
HYDROLOGY
AGRO
ECONOMICS
POLICY
PCRaster – PolFlow
Scheldt basin F-B-NL (1 km2)
ExtendSim
simulation 2008 -2038
(time step 1 year)
GIS
Integration ExtendSim- PCRaster
18/11/2010 4© 2010, VITO NV
Approach:
1. ExtendSim writes ASCII file for PCRaster
2. ExtendSim interface block starts PCRaster
3. PCRaster performs map-based calculation
4. PCRaster stores maps for ExtendSim
5. PCRaster deletes lock file, ExtendSim takes
over
18/11/2010 5© 2010, VITO NV
PCRaster: generic platform spatial modelling
• Raster-based GIS, suitable for distributed dynamic
modelling
• High-level scripting language
• Compatible with other systems due to use of door
ASCII script files and implementation in GDAL
• Simple to update/replace model and data
• Maps + map series
• Tables with temporal data
• Free of charge
• PCRaster Python library for advancrd GIS
functionalities and couping with other models / GIS
systems
18/11/2010 6© 2010, VITO NV
PCRaster model Scheldt (PolFlow)
after De Wit (1999)
Industry Households Agriculture Atm. Deposition Other
Direct sources (Dix) Soil surface surplus (SSSx)
Soil/Groundwater system
Indirect sources (IEx)
Rivir network
N load at location x (Lx)
18/11/2010 7© 2010, VITO NV
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Extendsim – generic platform for dynamic simulation
• completely graphical design environment based on
hierarchical simulation models
• extendable, generic libraries of reusable model building
components (graphical or in C++ like language)
• large number of tools for “on-the-fly” visualisation,
calibration, data management etc.
• integration of internal and external databases
• coupling PCRaster (new SPICOSA deliverable)
• online support and low entry and maintenance costs
18/11/2010 12© 2010, VITO NV
transport &
processing of manure
manure
production
cattle farming
income effect
farm closures
distribution of free
area over sectors
change of cattle
stock and crop area
6 regions
8 farm types
5 animal types
10 crop types
(Sources: FADN- VLM-ILVO)
PCRaster
N concentration
Hemiksem
N deposition
norm (kg/ha/jr)
Farming module ExtendSim
manure norm
area
reference income
18/11/2010 13© 2010, VITO NV
Estuarine/marine module
18/11/2010 14© 2010, VITO NV
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animation of concentration via model building components
which can be place on map and communicate with PCRaster
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Input data PCRaster
Main data:• Environment: soil use, relief, precipitation – temperature, soil type, N-
deposition, hydrogeology, land use
• Emissions:
• Domestic: IE (not) connected per WWTP
• WWTP: purification efficiency – year of construction
• Industry: individual discharges
• Agriculture: number of animals – crops per province, fertilizer use –
manure processing per province
• Calibration: water quantity and water quality samples
• General trends 1940- 2000 (evolution cattle stocks, crops, industrial
discharges, WWTP efficiency, population size ...)
Sources: FEA, DGRNE, Agence de l’eau Artois Picardie, EUROSTAT,
HIC, VLM – manure database, KNMI, EMEP, ...
18/11/2010 17© 2010, VITO NV
Nitrogen concentration
0
5
10
15
20
25
30
0 5 10 15 20 25 30
Mo
de
lle
d c
on
ce
ntr
ati
on
(m
g/L)
Observed concentration (mg/l)
Dendermonde (Dender)
Zwijngaarde (Bovenschelde)
Gent (Leie)
Deinze (Leie)
Mechelen (Zenne)
Willebroek (Dijle)
Grobbendonk (Kleine Nete)
Lier (Grote + Kleine Nete)
Hemiksen (Benedenschelde)
Nederzwalm (Bovenschelde)
Linear (lijn)
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Initial state 2008:
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State 2038 with cattle stock reduction (2 % per year)
N concentration outflow (mg/l)
2008 - 2038
18/11/2010 20© 2010, VITO NV