RELIABILITY OF HYDRAULIC STRUCTURES UNDER CLIMATE CHANGE Kamran Emami KuritKara Engineers Tehran,...
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Transcript of RELIABILITY OF HYDRAULIC STRUCTURES UNDER CLIMATE CHANGE Kamran Emami KuritKara Engineers Tehran,...
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RELIABILITY OF HYDRAULIC STRUCTURES UNDER
CLIMATE CHANGE
Kamran EmamiKuritKara Engineers
Tehran, Iran
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Kurit Kara Consulting Engineers
A summary of UNICEF report on THE STATE OF
THE WORLD’S CHILDREN 2005
Number of children in the world: 2.2 billion
Number of children living in poverty: 1 billion
Number of children in developing countries who livewithout adequate shelter
640 million
Number of children who have no access to safe water: one in five 400 million
Number of children who have no access to health services 270 million
Number of children who are out of school 121 million
Total number of children younger than five living in France, Germany, Greece and Italy: Total number of children worldwide who died in 2003 before they were five
10.6 million
10.6 million
Daily toll of children in the world who die before their fifth birthday: 29,158
The number of children who die each day because they lack access to safe drinking water and adequate sanitation: 3,900
Many technical jumps are desperately needed…………
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World population from 1000 BC to 2300 BC
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Kurit Kara Consulting Engineers
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Kurit Kara Consulting Engineers
Key findings of the Climate change report
75-250 million people across Africa could face water shortages by 2020;
More heavy rain events are very likely and more areas are likely to be hit by drought;
Crop yields could decrease by up to 30% in Central and South Asia;
Agriculture fed by rainfall could drop by 50% in some African countries by 2020;
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Kurit Kara Consulting Engineers
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Kurit Kara Consulting Engineers
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Kurit Kara Consulting Engineers
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Kurit Kara Consulting Engineers
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Adaptation Strategies
Predict the Climate Change trends
Non-Structural Approaches
Structural ductility
Public participation and Demand
Management
Holistic, integrated and Creative Approaches
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Holistic Approach to adaptive design of hydraulic structures (Emami, 1997)
Ensure a flexible and adaptive design in
view of hydrosystems changes and the
inherent uncertainties of water
engineering.
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Holistic Approach to adaptive design of hydraulic structures (Emami, 1997)
Establish the interdependence and
synergy of structural and non-structural
approaches in design.
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Holistic Approach to adaptive design of hydraulic structures (Emami, 1997)
Adapt to the stochastic nature of river
flow by integration of seasonal
characteristics and river forecasting.
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Holistic Approach to adaptive design of hydraulic structures (Emami, 1997)
Design hydraulic structures to adapt to
extreme events far larger than design
parameters and remain inherently safe
(structural ductility)
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Holistic Approach to adaptive design of hydraulic structures (Emami, 1997)
Enhance safety by 'designing'
emergency and crisis management
preceding the events and in real time for
the structure and downstream population
centers
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FAST diagram of Holistic Design
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Evolution of Non-Structural Approaches
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LIVING WITH FLOODING
Flood risk cannot be eliminated
Residual risk can be managed
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• protection levels are generally far below the economic optimum
• serious risk of loss of a large number of lives when an extreme event would occur
• costs of only physical solutions are generally unaffordable
CHARACTERISTICS RESULTSOF THE DEVELOPMENTS
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Protection levels are generally far below the economic optimum
0
200
400
600
800
1000
1200
Cost 1950
Damage 1950
Total 1950
Damage 2005
Total 2005
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WHY CONSIDER RESIDUAL RISK?
NewOrleansFloodsSeptember2005
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WHY CONSIDER RESIDUAL RISK?
New Orleans FloodsSeptember 2005
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Challenges of flood Engineers
Substantial Increase of Flood Risk
Uncertainty in all aspects
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Kurit Kara Consulting Engineers
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Kurit Kara Consulting Engineers
Adaptive management Principles (2004)
• Adaptability (Change Threat to Opportunity)
•Flexible Decision Making (uncertainties)
• Monitoring and vigilance
• Learning while doing
• Application of New knowledge and technologies
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Adaptive management Principles (2004)
• Avoiding costly irreversible mistakes
•Updating the Objectives
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Adaptive management Principles (2004)
• Resilience
• Harmony with Environment (step by step)
• Passive and Active AM
• Stakeholders Participation
• Enhanced Real time reactions
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Kurit Kara Consulting Engineers
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كارايي
يش بيني پسامانه هاي و هشدار
نفر300000: 1970
نفر140000: 1991
نفر3500: 2007
1970 1991 2007 0
50000
100000
150000
200000
250000
300000
350000
Human Loss
Bangladesh Cyclones
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Climate Forecasting by El Nino and La nina
Normal (Dec. 93)
El Nino (Dec. 97)
La Nina (Dec. 98)
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Risk Analysis
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Flood management in Sistan, Iran
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Successes of AM in Early Impoundment of Large dams in Iran
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Successes of AM in Early Impoundment of Large dams in Iran
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مهندسان مشاوركريت كارآ
VE of Ajichay Spillway
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Vanyar Dam Spillway Value
Engineering Workshop - 2003
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VE Proposals and Results
• Enhanced Reservoir Operation Based on new rule curve, Seasonal forecasting and flood Warning
• Reduced Cost (spillway length form 110 to 40m)
• Enhanced Dam Safety• Drastic Attenuation of floods in the
reservoir
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Routing of Floods in Aji Chay Reservoir
PMF10000100050010050Return Period (Year)
29851052753671501431Peak Inflow
2280780575500330260Peak Outflow (Base Case)
1350280180165160160 Peak Outflow
(VE Alternative)
more than twice of 10000 Year
>1000200100127Return Period (Base Case)
30% more than 10000 Year
<104333 Return Period
(VE alternative)
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Aij Chay Flood Forecsting and Warning system
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Tabriz Weather Radar
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Conclusions
- Based on experiences of application of AM in several larges projects it can be concluded that:
- Adaptive flood risk Management is an effective, efficient and versatile tool.
- AM emphasize of Non-structural approaches enhance adaptability, flexibility and sustainability.
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Basic Requirements:
- Efficient and reliable Water Managers and experts
- Comprehensive and reliable Monitoring System
- Preparedness and Plans for Emergencies
- Regulations to ensure flexibility and adaptability
- Resources and Training
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ب% ا توج%ه ب%ه ع%دم قطعيته%ا بايس%تي بج%اي راه%برد اجتن%ابي از راه%برد س%ازي اس%تفاده نم%ود. در اين راس%تا مق%اوم س%ازي تط%بيقي و مق%اوم
س%دهاي خ%اكي در مقاب%ل س%يالب و اس%تفاده از س%دها و فرازبن%دي بت%ني ميتواند بيشترين ايمني را با حداقل هزينه تامين نمايد.
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Free-standing blocks,
so called Fusegates ,
are installed
side by side
across the spillway sill
Downstream toe abutment
Upstream seal
Downstream bucket side
Overspilling crest
Bucket
Side seal
Concrete sill
Inlet well
Adaptability and FlexibilityDescription of a Fusegate
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In such a way
that they form
a watertight barrier.
Description of a Fusegate
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Working Concept – Normal Operation
Toe abutment
Drain hole
Ballast
Inlet well
Base chamber
Common Floods are discharged between the
Fusegates crest and the inlet levels
Inlet wells are set at different elevations
At this stage the chamber is empty
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Working Concept – Exceptional FloodsFor exceptional floods only, the
reservoir level increases until the water begins spilling
over the inlet lips.
Drain holes can not discharge all the flow.
Uplift pressure builds up in the
chamber.
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Working Concept – Exceptional Floods
Uplift pressure causes the Fusegate to overturn.
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Environmental Impacts
Progressive release of the flood
water
Outflow not exceeding the inflow
Tip off probability = very low (usually 1 in 100 years and above)
Maximum Water Level in the
reservoir not raised
General principles
0
50000
100000
150000
200000
250000
300000
350000
400000
0,0 10,0 20,0 30,0 40,0 50,0 60,0
time (hours)O
utflo
w (c
fs)
Tipping stages
Flood Routing through a Fusegated Spillway
PMF
Blue curve: inflow / Red curve: outflow
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Increase Storage Capacity
3. No increase in Maximum Water Level
2. Fusegates are used to increase the Full Supply Level
1. The sill is modified slightly
New Full Supply Level
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Main characteristics
Purpose:Flood attenuation
Discharge capacity:8500 m3/s
Spillway length:93 m
Fusegate height:6,50 m
Number of units:6
Former storage capacity:173 Mm3
New storage capacity:226 Mm3
Storage increase:30%
Terminus Dam, CA – USA
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3. The storage capacity of the dam is recovered by installing Fusegates.
2. The spillway sill is lowered in order to pass the design flood.
1. The spillway is not able to pass the design flood below the MWL.
Increase Discharge Capacity
4. The storage capacity could even be increased by installing higher Fusegates.
Full Supply Level
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Main characteristics
Purpose:Recreation
Storage capacity:6,6 Mm3
Spillway length:125,0 m
Fusegate height:6,5 m
Number of units:10
Former discharge capacity:1245 m3/s
New discharge capacity:5000 m3/s
Discharge capacity increase:300%
Shongweni Dam – South Africa
1995 Most outstanding Civil Engineering
Achievement in Technical Excellence Award
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Dam Safety Strategy in Switzerland
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در مورد كاهش ريس%كICOLD بولتنسده%ا بوسيله روشه%اي غي%ر سازه اي
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Kurit Kara Consulting Engineers
Levees only!
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Evolution of Flood Management Strategies