Modelos Para Sistemas de Drenaje Urbano

7/31/2019 Modelos Para Sistemas de Drenaje Urbano

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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


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


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

Modelos Para Sistemas de Drenaje Urbano

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