1.6 - Tropical Cyclones: Hazards & Effects
Physical hazards caused by tropical cyclones
Tropical cyclones, also known as hurricanes or typhoons, are powerful weather systems that create a range of dangerous physical hazards when they make landfall. These hazards stem from the extreme conditions associated with the cyclone's structure and intensity.
Key physical hazards of tropical cyclones
- High winds - Winds within tropical cyclones can reach speeds of up to 250+ km/h, capable of causing severe structural damage.
- Intense rainfall - These storms can unleash enormous volumes of water, often trillions of litres per day, with rainfall becoming more intense closer to the cyclone's eye.
- Storm surges - A dramatic rise in sea level occurs due to low atmospheric pressure and powerful winds pushing water towards the shore.
- Coastal flooding - Driven by storm surges and massive waves propelled by strong winds, this flooding can submerge low-lying coastal areas.
- Landslides - Heavy rainfall saturates soil on hillsides, making them unstable and prone to sliding.
Impacts of tropical cyclones on people and communities
The destructive force of tropical cyclones has profound effects on human populations, disrupting lives through immediate dangers and long-term challenges.
Social and economic consequences of tropical cyclones
- Loss of life and injury - Floodwaters and storm surges create powerful currents that can drown individuals, while flying debris propelled by high winds poses a lethal threat.
- Homelessness - Entire buildings can be demolished by ferocious winds, leaving countless people without shelter.
- Disruption of utilities - Electricity supplies are often severed as cables are torn down or washed away.
- Contaminated water supplies - Sewage systems overflow during flooding, polluting drinking water sources.
- Spread of disease - Shortages of clean water combined with poor sanitation conditions create a breeding ground for illnesses.
- Food scarcity - In poorer nations, crops are often destroyed and livestock killed, leading to food shortages.
- Economic hardship - Unemployment surges as businesses suffer damage or complete destruction.
- Blocked access for aid - Damaged roads and infrastructure prevent emergency vehicles and aid from reaching those in need.
Environmental effects of tropical cyclones
Beyond their impact on human populations, tropical cyclones inflict severe damage on natural ecosystems.
Ecological damage caused by tropical cyclones
- Destruction of wooded habitats - High winds uproot trees, leading to the loss of forests and the habitats they provide.
- Erosion and coastal habitat loss - Storm surges wear away beaches and damage delicate coastal ecosystems, such as coral reefs.
- Pollution of freshwater systems - Flooding from storm surges introduces saltwater into rivers and lakes, harming aquatic life.
- Sediment deposition in waterways - Landslides triggered by heavy rain dump large amounts of sediment into rivers and lakes, suffocating fish and other wildlife.
- Chemical contamination - Flooding can breach industrial facilities like oil refineries or chemical plants, causing leaks of hazardous substances into the environment.
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