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50: Weather Effects.

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Presentation transcript:

Image from Humans are moving seaward (closer to the water) Ocean is moving landward Humans are moving seaward (closer to the water) Ocean is moving landward Coastal Processes

LIDAR surveys - Dauphine Island, Gulf Coast of Alabama Landform changes caused by storm events

Coastal Hazards Coastal areas Variable topography, climate, and vegetation Dynamic area Convergence of continental and oceanic processes Often populous (75% of US lives in coastal zone) Types of Hazards Tidal floods Tropical cyclones Tsunamis Coastal erosion

Sea Level Rise From IPCC AR4 (2007), Physical Science Section, Chp. 5 “Long term” water level change Contributing factors: Melting of Earth’s ice volume Reconfiguration of Tectonic Plates Thermal Expansion of Seawater

Scenario for WAIS melting

Effects of Sea Level Rise

Tides Daily water level change

Storm Surge Episodic water level change

Storm Surge Model

Tropical Cyclones

Coastal Hazards Tropical cyclones Originate near equator between 8˚N & 15˚S Typhoon (Pacific) and hurricane (Western Hemisphere) Effects High winds (> 75 mph or 120 km/hr) Flooding – causes most life loss & damage Storm surge Heavy rains Tornadoes Results Deaths declining with improved warnings Property damage- $10 billion from Andrew Problems Increasing coastal population Poor evacuation routes Inadequate building codes/enforcement

Wind Speed Distribution >100 km/hr over a region ~160 km in diameter >60 km/hr over a region ~640 km in diameter 160 km 640 km

Frequency About 5 per year Greatest risk Florida Texas Three common tracks On-shore Gulf of Mexico East Coast skimmers Hurricane Strike Probability Map

Tropical Storms Storm tracks generally fall into three categories: 1) Atlantic U-turns 2) Gulf coast strikers 3) East coast skirters

1999 Tropical Storms

1999 Tropical Storms – Large Waves Data from Cape Canaveral Buoy and Model Results