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Cilmatic Risk Assessment Of Southern Express Way in Sri Lanka
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Transcript of Cilmatic Risk Assessment Of Southern Express Way in Sri Lanka
Climatic Risk Assessment on
Southern Expressway in Sri Lanka
Climatic Risk Assessment on
Southern Expressway in Sri Lanka
BY
S.D. Kelum Priyantha
Thiwanka Jayasiri
MSc in Geoinformatics
IHRA
University of Colombo
28th June 2014
• The Southern Expressway,
also known as the Southern
Lanka Distributor is Sri
Lanka's first E Class highway.
• The 126 km long highway
links the Sri Lankan capital
Colombo with Galle and
Matara, major cities in the
south of the island
• Rainfall
• Temperature
• Bends
• Flood
• Landslides
Average Rainfall (mm)
• Dry zone → < 1,750
• Intermediate zone → 1,750-2,500
• Wet zone → > 2,500
Located in
Wet Zone
Geometric Design of road
Vs
Weather
Deflection Angle
There are lot of bends
associated with
southern expressway
Bend Index are
calculated as follows
(Deflection angle/Bend
length) * 100
If Bend Index is high then risk
also high
Rain Fall
First Inter MonsoonMarch-April
Southwest MonsoonMay – September
Second Inter monsoon October-November
Northeast MonsoonDecember-February
Rainfall Trend (mm/year)
Temperature
Temperature January, February
July - December
Temperature March
Temperature April
Temperature May
Temperature June
Landslide
Landslides (1947 - 1996)
Landslides Risk DS Divisions
Flood
Flood Risk At 1m elevation
Flood Risk At 2m elevation
Flood Risk At 3m elevation
Flood Risk At 4m elevation
Flood Risk At 5m elevation
Flood Risk At 6m elevation
Flood Risk At 7m elevation
Flood Risk At 9m elevation
Flood Risk At 13m elevation
Flood Risk At 20m elevation
Risk Analysis Chart for Rainfall
( Risk Barometer )
Risk Analysis Chart of Rain Fall
(km)
First Inter monsoon Southwest Monsoon Second Inter monsoon Northeast Monsoon
• Premature deterioration of infrastructure
• Damage to roads from buckling and rutting
• Damage to tires of vehicles
• Bridges subject to extra stresses through thermal expansion
and increased movement
Climate Change Impacts on the Highway
System
Change in extreme maximum temperature
• If more rainfall, there will be an increased risk of landslides, slope failures, and floods from the runoff, causing road washouts.
• Increasing precipitation could lead to soil moisture levels becoming too high (structural integrity of roads, bridges, and tunnels could be compromised leading to accelerated deterioration)
• Less rain available to dilute surface salt may cause steel reinforcing in concrete structures to corrode
• Road embankments at risk of subsidence
• Bridges, signs, overhead cables, tall structures at risk from increased wind speeds
Climate Change Impacts on the Highway
System
Greater changes in rainfall levels
• Weather phenomenon such as rainfall,
temperature, wind, fog and disaster such as
flood, landslides and extreme weather events
that could in some way affect the operations
of a transportation system or facility.
Findings
Findings
• The highway is mainly in the wet zone.
• The drivers faces two main problems due to
climatic conditions. Rain and Fog.
• In addition strong winds may cause specially
on rainy days.
• No street lamps along the road except in main
junctions.
Safety Process
Safety Precautions
• Identifying the most risky areas along the road and risky seasons using Risk Analysis Charts ( Risk Barometer )is very important.
• Identify the risky places where should establish sign boards and use ‘Dynamic electronic speed limits sign boards’ according to weather conditions. Specially in rainy days drive “below” the speed limits.
• Encourage drivers to use fog lights when driving in the fog.
• Use head lights even in day time when driving in rain or fog.
• Make sure of the lights and wipers are in proper order before entering to the highway.
• Make aware the drivers regarding weather conditions by mentioning on the ticket of the day before entering to the highway.
• Properly check whether vehicle & driver are in allowed conditions.
• In case of flood, find the solution to make connection between expressway and general road network
• Make precautions by analyzing of weather trends such as rainfall, Temperature due to global warming, tsunami, Landslides