DSD-INT 2015 - Operational system for the eThekwini municipality - Angus Gowar
DSD-INT 2015 - Application of urban water balance model for Utrecht
-
Upload
delftsoftwaredays -
Category
Software
-
view
295 -
download
0
Transcript of DSD-INT 2015 - Application of urban water balance model for Utrecht
30 oktober 2015
Application of Urban Water BalanceModel for Utrecht Station Area
Reinder Brolsma and Roy Molenaar
Why a simple urban water balance model
• Application in data poor locations of phases of projects
• Understanding the urban water system including water supply and demand
• Quantify chronic (water) stress and drought
• Scenario analyses• Quantify effects of climate and land use scenarios• Quantify effect of adaptation measures
30 oktober 2015
Utrecht example
• What can be achieved by different sustainable land use options
30 oktober 2015 3
30 oktober 2015 4
Urban water balance model
• 0D- Bucketmodel
• RTC-Tools (http://oss.deltares.nl/web/RTC-tools)
• Implicit scheme
• Definition of states and fluxes in C++, parameterization in XML
• Calibration using (OpenDA)
30 oktober 2015
Urban Water Balance Model – Full version
30 oktober 2015
Urban Water Balance Model – Utrecht version
30 oktober 2015 7
30 oktober 2015
Paved Paved permeable
Runoff Infiltration
Evaporation
Through fall
Vegetation
Evapotranspiration
8
Configuration
30 oktober 2015
<storageNode id="PAV"><AREA>1.3</AREA><input>
<unitVolume>P</unitVolume></input><state>PAV</state>
</storageNode>
<link><evaporationInterception id=“PAV_evaporation"><parameter>
<AREA1.3</AREA></parameter><input>
<HUp>PAV</HUp><EP>EP</EP>
</input><output>
<Q>e_pav_Q</Q></output></evaporationInterception>
</link>
<link><percolation id="infiltration PAV">
<parameter><AREA>1.3</AREA><PERC>0.005</PERC>
</parameter><input>
<HUp>PAV</HUp><HDown>UZ</HDown>
</input><output>
<Q>perc_pav_Q</Q></output>
</percolation></link>
Paved permeable
Infiltration
Evaporation
<storageNode id="UZ"><AREA>3.6</AREA><state>UZ</state>
</storageNode>
Calibration
30 oktober 2015 10
Introduction Background Method Results Discussion Conclusion
0
0,05
0,1
0,15
0,2
0,25
0,3
0,35
0,4
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Gro
undw
ater
leve
l(m
+NAP
)
Observed
Simulated
-Observed groundwater levels for the year 2010-Nash-Sutcliffe of 0.61-More uncertainty during and after rainfall events-Better estimations during dry periods.
30 oktober 2015 11
Water fluxes summer
30 oktober 2015 12
Water fluxes winter
30 oktober 2015 13
Land use scenarios
• Replace closed paved by permeable pavement• Replace closed and permeable paved by highly permeable
pavement• Connect roof discharge from sewer system to groundwater• Increase paved surface by replacing green area• Increase unpaved area by replacing paved area (10%)• Increase unpaved area by replacing paved area (25%)• Increase surface water
30 oktober 2015
Water fluxes permeable pavement
30 oktober 2015 15
Introduction Background Method Results Discussion Conclusion
Effects on groundwater
30 oktober 2015 16
0,2
0,24
0,28
0,32
0,36
0,4
0,44
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Gro
undw
ater
leve
l(m
+NAP
)
Current
permeable pavement case 1
permeable pavement case 2
disconnection roofs
increased paved surface
more green 10%
more green 25 %
more surface water
• Permeable pavement and disconnection of roofs improvesgroundwater levels
• An increased paved surface reduces groundwater levels
Effects on evapotranspiration
30 oktober 2015 17
-6
-4
-2
0
2
4
6
8
10
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Evap
otra
nspi
ratio
nch
ange
(mm
)
disconnection roofs
permeable pavement case 2
permeable pavement case 1
more green 10%
more green 25 %
green roofs extensive
green roofs intensive
blue roofs water retention
more surface water 4x
increaed paved surface
more surface water 2x
• Vegetation and green roofs improve evapotranspiration (cooling)
30 oktober 2015
Urban Water Balance Model
• Urban water system and water cycle• Model runs fast• Fast setup from global and local datasources• Effect of scenarios (e.g. climate, landuse, …)• Effect of measures