modelos para sistemas de drenaje urbano
TRANSCRIPT
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Data-driven and Physically-based Models for Characterization of Processes in
Hydrology, Hydraulics, Oceanography and Climate Change
6 - 28 Jan 2008
by
Ming-Ming Wang, Ph.D. student
Dr. Yu-Wen Zhou, Professor
Development of Integrated Models for
Urban Drainage Systems
Data-driven and Physically-based Models for Characterization of Processes in
Hydrology, Hydraulics, Oceanography and Climate Change
6 - 28 Jan 2008
NUS, IMS
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Institute for Mathematical Sciences(IMS)
Singapore - Delft Water Alliance(SDWA)
Tropical Marine Science Institute(TMSI)
Pacific Institute for Mathematical Sciences(PIMS)
Acknowledge
This work was supported by the National NaturalScience Foundation of China (Grant No.50678009)
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Background
Integrated model framework
Modeling Popular GIS software packages
Popular model software packages
Design of storm sewer system
Conclusion
Discussion
Contents
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Backgroundurban sewer system
Receiving
river
Treatmentplant
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BackgroundUrbanisation
is a significant global trend
not only calls for new sewer system,but stresses existing urban sewer system.
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BackgroundJanuary 3, 2006Sewage pipes
emergency inBeijing
East Third Ring Road
Road collapse
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Sudden heavy stormJuly 10, 2004
Background - Climate Change
strongest storm in a decade
111 mm fell on Tiananmen Square
The storm started at 4:00 pm
and continued for about 3 hours
Flooding inBeijing
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Background - Climate Change
Flooding in
Beijing
Locus Bridge of downtown Beijingthe water reached a depth ofover 1.5 meters
Flooding paralyzes Beijing traffic
Highly concerned by Chinese Premier
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1. Large cities
2. Complex sewer systems
3. Integrated management (Pollution control, stormwater andsewage network management and flood prevention)
4. The need of Decision support online
We need integrated complex models, using the advancedtechnologies (GIS, SCADA, etc.)
Background
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GIS
Presentation of
drainage system
and provides
information
Simulation and
assessment of
drainage system
SYSTEM
INTEGRATIONDATABASE
The framework of integrated model
Monitoring of
drainage systemperformances
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Popular GIS software packages used in China
ESRI ArcGIS
MapInfo
MapGIS
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ArcGIS
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MapInfo
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MAPGIS
Underground pipeline networksmanagement system
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Popular model software packages used in China
US EPA
DHI
Bentley
Wallingford
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SWMM
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Mike Urban
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SewerGEMS
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Infoworks CS
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Storm
Process of Storm to sewer network
Catchment
Sewer
Hydrologicalmodel
hydraulic
model
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Rainfall
Effectiverainfall
Inflowhydrograph of
the inlet
Outflowhydrograph ofsewer system
Lossesmodel
unit hydrograph
Non-steady flow
hydraulicsnumericalsolutions
Modeling of Storm sewer system
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Design of Storm sewer system
Design storms are routinely used fordesigning storm sewer system.
A design storm is a hypothetical storm with
specific durationD
andreturn period
T.
The information of design storms isconveniently presented in the form ofdepth-duration-frequency (DDF) curves orintensity-duration-frequency (IDF) curves.
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Design of Storm sewer system
storm sewer system without storage facilities
storm sewer system with storage facilities
Need peak flowRational method: Qp=CiA
Need flow hydrograph
Data need:Design stormwith time distribution
Data need:
Design storm
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Difference
Spatial scale Temporal scale
River/watershedhydrology
large year, day, hour
Urbanhydrology
relative small day, hour, minute
Rainfall data in China
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Department ofhydrology
rainfall data
resolutionhour, day, year
Rainfall data in China
Department of urbandrainage
rainfall data
resolutionminute, hour, day
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Rainfall data
resolution
day
Published rainfall data
resolution
hour, minute
?
Design storm
With time distribution
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Storm pattern
Chicago storm Intensity-Duration-Frequency relationship
In China, duration5, 10, 15, 20, 30, 45, 60, 90, 120min
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Storm pattern
a 25-year, 24-hour duration rainfall10.01inSCS Type-III storm in Harris County
using a one-hour time increment
0.00
0.50
1.00
1.50
2.00
2.50
3.00
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Time (hours)
Precipita
tion
(in)
SCS storm pattern
example
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storm pattern
Department of hydrology in China
Typical storm method
Downscaling methodDaily GCMs to sub-daily precipitation5-min to 1 hour1 hour to 1-day
Professor Van-Thanh-Van Nguyen
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Water resources problem in China
Too little water
Too much water
Polluted water
increased frequenciesor magnitudes of floods.
Water shortage
The discharges of wastewater byindustry and householdshave considerable detrimental effectson water quality and on public andecosystem health.
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temporary storing of stormwater, reduce flowpeaks, reduce the pipe size of downstream
reduce runoff pollution
rainwater reuse
The rainwater tank as a runoff control measureis widely used.
Flood control & pollution control
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Flood control & rainwater reuse
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Current storage volume calculation in China
Storage volume of detention tank
where
Vstorage volumem3
Qmaxdesign peak flow of upstream pipem3/s
tcduration of Qmaxs
coefficient , =Qmax/Qdownstream
Storage volume of rainwater tank
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Tank volume
Inflow hydrograph
discharge Q
time t
Calculation of detention tank for floodcontrol
fed downstream after theend of storm event
volume fed downstream during storm event
reduce flow peaks
2
11
( )t
in out t
V Q Q dt
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Calculation of stormwater tank to capturethe first flush
Tank volume
Inflow hydrograph
the first flush
discharge Q
time t
Usually the stormwater that initially runs off an area will
be more polluted than the stormwater that runs off later,after the rainfall has 'cleansed' the catchment.
The stormwater containing this high initial pollutant loadis called the 'first flush'.
reduce runoff pollution
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Calculation of stormwater tank to capturethe first flush
storagevolume
rainfall data water quality data
stormwater tank
temperature, pH value, dissolved oxygen (DO),electrical conductivity, suspended solid (SS),turbidity, alkalinity, ammonia nitrogen,total nitrogen (TN), total phosphorus (TP), totalorganic carbon (TOC), chemical oxygen demand(CODMn), total hardness, Ca
2+, Mg2+, sulfate,
Fe, Mn, Cu, Zn
Monitoringwater quality
0
20
t
inV Q dt
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Calculation of stormwater tank to rainwaterreuse
Tank volume
Inflow hydrograph
discharge Q
time t
Rainwater reuse
0
3( )
dt
in out
t
V Q Q dt
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Tank volume
Inflow hydrograph
Tank volume
Inflow hydrograph
Tank volume
Inflow hydrograph
Stormwater tank with multi-function(flood control, pollution control, rainwater reuse)
Storage volume=max{V1,V2,V3}
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The aim of this work is only to provide the method fordesign of the storm sewer system with storage facilitiesin China.
The Storage volume calculation method of stormwatertank with multi-function(flood control, pollution control,rainwater reuse) is provided for China.
Conclusion
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DiscussionDownscaling method
Daily GCMs to sub-daily precipitation5-min to 1 hour1 hour to 1-day
River/watershed
hydrology
urban
hydrology
River/watershed
hydrology
urbanhydrology
Sub-daily to daily precipitation
5-min to 2 hour2 hour to 1-day
Large Small
Time (hour)
Rain
fall(mm)
1 2 245min
S k h l f
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Tank volume
Inflow hydrograph
Stormwater tank with multi-function(flood control, pollution control, rainwater reuse)
How to operate ?
Monitoring
water quality
Tank volume
Inflow hydrograph
First flush diverter
S k i h l i f i
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Tank volume
Inflow hydrograph
Stormwater tank with multi-function(flood control, pollution control, rainwater reuse)
How to operate ?
Modeling ofsewer network
Storms withreturn period
2yr, 5yr, 10yr
Outflow of outlet
Water levelof outlet
Overflow weirto the tank IF network
overflow
Get the storm withreturn period
Before this stormEmpty
the tank
setting
k l d
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Thank you
Acknowledge