protection of the havana seafront from wave action . alternatives and laboratory testing ·...
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Protection of the Havana seafront from wave action . Alternatives and Laboratory Testing
Prof . Luis Córdova López
Salerno. Italia November 2013
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Cuba is located in the northern Caribbean Sea at the confluence with
the Gulf of Mexico and the Atlantic Ocean. There is an area where almost
every year originate and moving hurricanes which together with the
presence of cold fronts and extratropical storm make coastal areas highly
vulnerable to flooding due to penetrations of the sea.
Cuba
• 1,250 km (780 mi) long.
• Land area (104,556 km2 )
• Largest island in the
Caribbean.
• People (11,241,161)
• Capital (Havana)
• Coast line length
(5,746 km)
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Havana
• Land area (728.26 km2)
• People (2,1 millions)
• Capital city of the country
• Third largest metropolitan
area in the Caribbean
region.
Havana is constantly evolving because it is
the capital of the country, besides it
represents a great interest for tourism.
One of the areas in which more work is
being done is on the Malecon in Havana
and in the bay.
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“Malecón de la Habana”
It has three main functions.
• Social enjoyment
• Roadway
• Wall for coastal defense
Malecón Traditional
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• Social enjoyment
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• Roadway
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• Wall for coastal defense
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Problem situation
• Global Climate Change increase
frequency and intensity of hurricanes
and tropical storms.
• Great amount of water overtopping the
seawall due to:
Height of the waves combined with
storm surge
Necessity to make work
projects to defense coastal
zones against severe waves
attacks
Different hurricanes trajectories have attacked Havana
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Different hurricanes trajectories have attacked Havana
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Problems to be solved by protection works
Avoid the ingress of sea water for the storm drains that discharges to malecon.
Avoid or reduce wave overtopping on Malecón seawall.
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Problems to be solved by protection works
Entrance of the sea water thought storm drains during the attack of Wilma hurricane.
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Problems to be solved by protection works
Wave overtopping during the attack of storms
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Hydraulic Research Center of ISPJAE joined to Malecon Protection studies since the end of 80th and with greater intensity since the beginning of 90th .
Wave flume 90 meters of length 1,5 meters of width 2,0 meters of depth Regular waves generation
Wave pool 25 meters of length 25 meters of width 1,0 meters of depth Regular waves generation
Facilities where the physical modeling studies are done at CIH - CUJAE
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Expert group after the attack of “Tormenta del siglo” extratropical storm. (1993)
The actual section corresponds to section 4 and 5
At that time was studied section 2
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Avoid the ingress of sea water for the storm drains that discharges to malecon.
Alternatives studied
Outfall. Length 100 meters. Frontal out and resting on the bottom.
Outfall. Length 25 feet. Two sides outlets. Outfall. Length 25 meters. Frontal out. Punta de lanza with side at 90 degrees.
Punta de lanza proposed by researchers in CIH.
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Avoid or reduce wave overtopping on Malecón seawall
Study of different alternatives for protection against wave overtopping by physical model in the 90th
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Offshore Breakwater with change of the profile
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Studies of coastal protection alternatives by physical modeling in irregular wave tank. CEPYC. 1995. Spain. Section # 2
In 1995, for a period of three months a group of Cuban specialists in conjunction with Spanish specialists conducted a significant number of physical model tests in irregular wave tank facilities of the Center for Ports and Coasts in Madrid, Spain.
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Structures testing
Curve wall with berm Curve wall without berm
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PROPOSED COASTAL DEFENCE
WORKS TO GIVE SOLUTION
TO THE PENETRATION OF THE
SEA IN TRADITIONAL
MALECÓN AREA OF THE CITY
OF HAVANA
Study of Climate, bathymetry and topography for the section to study.
Study of wave propagation through the application of mathematical modeling
Characterization of the study area based on the propagated waves and in bathymetric and topographic features.
Dimensioning of the defense elements, say coast protection and defense of storm drains that discharge into the study area. Preliminary study of the performance of the proposed solutions.
Objetives
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Subsections
Average
height of
the
wall(m)
Average height of the
wall over the sidewalk
(m)
Minimal
height of
the wall(m)
Maximal
height of
the
wall(m)
Subsection
length(m)
1 3.978 0.898 3.85 4.14 245.56
2 4.332 1.182 4.24 4.39 516.03
3 3.956 0.717 3.85 4.13 1053.84
Seawall characteristics
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Scenarios Hs
(m)
Tp
(s)
Surge
(m)
high tide
(m)
climate change
(m) total sea level (m)
Return period
50 years 9.2 10.6 1.06* 0.40* 0.27 1.73
Rita hurricane 3.7 11.09 1.31 0.40* 0.27 1.98
Wilma
hurricane 5.8 11.34 1.53 0.48 0.27 2.28
The value of surge for Return Period scenario 1/50 years has been taken from the final report "general hydrometeorological characteristics of the coastal zone for the Malecón Habanero", by Dr. Ida Mitrani (1994). The same applies to the freeboard due to the influence of the wind "wind setup".
Main restrictions Maximal height of the seawall looking from the street: 1.26 m Maximal overtopping: 50 l/s/m
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Bathymetric characteristic of the study area
y = -0.0479x - 0.6533
y = -0.2794x + 72.582
y = -0.4177x + 100.01
-250
-200
-150
-100
-50
0
50
-200 0 200 400 600 800
Pro
fun
did
ad (
m)
Distancia (m)
Perfil característico: Calle Gervasio
Tramo I
Tramo II
Tramo III
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Study of wave propagation to the coast
The process of wave transformation from deep water to the coast line, is done by mathematical modeling.
The mathematical model used is SWAN: A model of wave generation and propagation of third generation, with which we obtain wave parameters in coastal areas.
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Muro de sección transversal de simple curvatura
Colocación de una berma de elementos sueltos al pie del muro existente
Muro de sección transversal de simple curvatura y colocación de berma al pié del muro
formada por rocas.
Rompeolas sumergido a cierta distancia de la línea de costa
Typologies
Alternatives are classified into two groups: Group One: those developed on shallow
water or at coast line Group Two: the solutions at sea
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Physical model studies
Different structures to study in the laboratory
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Curve seawall
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Alternatives
Rock berm in front of the current wall
Rock berm in front of the curve wall
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Trunk section
Head section
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Necessity of the physical model studies
• The equations used for the design of the alternatives are empiric and they don't represent the situation totally.
Main tests 1. Wave overtopping. 2. Stability of the elements that compose the berms and the breakwater. 3. Mensuration of the pressures on the seawall.
Taken Eurotop manual 2007
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Objectives and scope of the Study in physical model.
• The studies in physical model would be two-dimensional scale 1:30, it would be directed to:
1. To evaluate the reduction percent of the wave overtopping and number of wave overtopping for different scenarios, keeping in mind the climatic change.
2. Optimization the curve Wall to reduce wave overtopping. 3. In the case of the application of berms , the stability of the elements should be studied to avoid excessive damages that it puts in danger its stability and later operation. 4. Determination of the pressures, fundamentally in the case of the curve wall, so that an appropriate design can be carried out from the structural point of view, and to avoid breaks of the bend, that which bears to the disqualification of its operation.
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Process of construction of the model.
Scale of the model = 1:30
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Process of construction of the model.
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Process of construction of the model.
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Process of construction of the model.
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Reproduction of the profile
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Reproduction of the profile
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Process of wave calibration
Scenarios 4 steps of waves (4m; 6 m; 8m and 10 m) 2 steps of wave period pick (10 s. and 12 s.) 2 steps water level +1.73 about msl +2.28 about msl TOTAL = 16
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Process of wave calibration. Placement of the level sensors
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Process of wave calibration. Making waves !!!!
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Future studies Determination with more precision the wave and storm surge Carrying out studies of simulation of the storm surge by means of the combination of: 1. Hydrodinamic mathematical models 2. Mensurations of tides buoys 3. Altimetry satellite 4. Modeling hurricane waves and storm surge using integrally-coupled, models
SATELLITE ALTIMETER CALIBRATION OF A WAVE MODEL IN THE ARABIAN GULF Alanoud N. Al-Ragum ,Claudia Giarrusso, Eugenio Pugliese Carratelli CUGRI and University of Salerno
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Muchas Gracias Grazie mille Thank you very much