Coastal flooding

Coastal flooding during Hurricane Lili in 2002 on Louisiana Highway 1 (United States)

Coastal flooding occurs when dry and low-lying land is submerged (flooded) by seawater. ^[1] The range of a coastal flooding is a result of the elevation of floodwater that penetrates the inland which is controlled by the topography of the coastal land exposed to flooding. ^{[1] [2]} The seawater can flood the land via several different paths: direct flooding, overtopping of a barrier, ^[3] or breaching of a barrier. Coastal flooding is largely a natural event. Due to the effects of climate change (e.g. sea level rise and an increase in extreme weather events) and an increase in the population living in coastal areas, the damage caused by coastal flood events has intensified and more people are being affected. ^[4]

Coastal areas are sometimes flooded by unusually high tides, such as spring tides, especially when compounded by high winds and storm surges. This was the cause of the North Sea flood of 1953 which flooded large swathes of the Netherlands and the East coast of England.

When humans modify the coastal environment this can make coastal flooding worse. ^{[1] [5] [6] [7]} Extraction of water from groundwater reservoirs in the coastal zone can instigate subsidence of the land, thus increasing the risk of flooding. ^[5] Engineered protection structures along the coast, such as sea walls, alter the natural processes of the beach. This can lead to erosion on adjacent stretches of the coast which also increases the risk of flooding. ^{[1] [7] [8]}

Types

High tide flooding, also called tidal flooding, is one of the causes for coastal flooding. It has become much more common in the past seven decades.

The seawater can flood the land via several different paths:

• Direct flooding — where the sea height exceeds the elevation of the land, often where waves have not built up a natural barrier such as a dune
• Overtopping of a barrier — the barrier may be natural or human-engineered and overtopping occurs due to swelling conditions during storms or high tides often on open stretches of the coast. ^[3] The height of the waves exceeds the height of the barrier and water flows over the top of the barrier to flood the land behind it. Overtopping can result in high velocity flows that can erode significant amounts of the land surface which can undermine defense structures. ^[10]
• Breaching of a barrier — again the barrier may be natural (sand dune) or human-engineered (sea wall), and breaching occurs on open coasts exposed to large waves. Breaching occurs when the barrier is broken down or destroyed by waves allowing the seawater to extend inland and flood the areas

Causes

Coastal flooding can result from a variety of different causes including storm surges created by storms like hurricanes and tropical cyclones, rising sea levels due to climate change and tsunamis.

Storm surge from Hurricane Carol in 1954

Storms and storm surges

Storms, including hurricanes and tropical cyclones, can cause flooding through storm surges which are waves significantly larger than normal. ^{[1] [11]} If a storm event coincides with the high astronomical tide, extensive flooding can occur. ^[12] Storm surges involve three processes:

1. wind setup
2. barometric setup
3. wave setup

Wind blowing in an onshore direction (from the sea towards the land) can cause the water to 'pile-up' against the coast; this is known as wind setup. Low atmospheric pressure is associated with storm systems and this tends to increase the surface sea level; this is a barometric setup. Finally increased wave breaking height results in a higher water level in the surf zone, which is wave setup. These three processes interact to create waves that can overtop natural and engineered coastal protection structures thus penetrating seawater further inland than normal. ^{[12] [13]}

Sea level rise

This section is an excerpt from Sea level rise.[ edit ]

Between 1901 and 2018, average global sea level rose by 15–25 cm (6–10 in), an average of 1–2 mm (0.039–0.079 in) per year. ^[14] This rate accelerated to 4.62 mm (0.182 in)/yr for the decade 2013–2022. ^[15] Climate change due to human activities is the main cause. ^{[16] : 5, 8} Between 1993 and 2018, thermal expansion of water accounted for 42% of sea level rise. Melting temperate glaciers accounted for 21%, while polar glaciers in Greenland accounted for 15% and those in Antarctica for 8%. ^{[17] : 1576} Sea level rise lags changes in the Earth's temperature, and sea level rise will therefore continue to accelerate between now and 2050 in response to warming that has already happened. ^[18] What happens after that depends on human greenhouse gas emissions. Sea level rise may slow down between 2050 and 2100 if there are deep cuts in emissions. It could then reach slightly over 30 cm (1 ft) from now by 2100. With high emissions it may accelerate. It could rise by 1 m (3+1⁄2 ft) or even 2 m (6+1⁄2 ft) by then. ^{[16] [19]} In the long run, sea level rise would amount to 2–3 m (7–10 ft) over the next 2000 years if warming amounts to 1.5 °C (2.7 °F). It would be 19–22 metres (62–72 ft) if warming peaks at 5 °C (9.0 °F). ^{[16] : 21}

Rising seas affect every coastal and island population on Earth. ^{[20] [21]} This can be through flooding, higher storm surges, king tides, and tsunamis. There are many knock-on effects. They lead to loss of coastal ecosystems like mangroves. Crop production falls because of salinization of irrigation water. Damage to ports disrupts sea trade. ^{[22] [23] [24]} The sea level rise projected by 2050 will expose places currently inhabited by tens of millions of people to annual flooding. Without a sharp reduction in greenhouse gas emissions, this may increase to hundreds of millions in the latter decades of the century. ^[25] Areas not directly exposed to rising sea levels could be vulnerable to large-scale migration and economic disruption.

Tidal flooding

Tidal flooding on a sunny day, during the "king tides" in Brickell, Miami in 2016

The last remaining house on Holland Island that collapsed and was torn down in the 2010s as erosion and tides reached the foundation.

This section is an excerpt from Tidal flooding.[ edit ]

Tidal flooding, also known as sunny day flooding ^[26] or nuisance flooding, ^[27] is the temporary inundation of low-lying areas, especially streets, during exceptionally high tide events, such as at full and new moons. The highest tides of the year may be known as the king tide, with the month varying by location. These kinds of floods tend not to be a high risk to property or human safety, but further stress coastal infrastructure in low lying areas. ^[28]

This kind of flooding is becoming more common in cities and other human-occupied coastal areas as sea level rise associated with climate change and other human-related environmental impacts such as coastal erosion and land subsidence increase the vulnerability of infrastructure. ^[29] Geographies faced with these issues can utilize coastal management practices to mitigate the effects in some areas, but increasingly these kinds of floods may develop into coastal flooding that requires managed retreat or other more extensive climate change adaptation practices are needed for vulnerable areas.

Tsunami Waves

Coastal areas can be significantly flooded as the result of tsunami waves ^[30] which propagate through the ocean as the result of the displacement of a significant body of water through earthquakes, landslides, volcanic eruptions, and glacier calvings. There is also evidence to suggest that significant tsunami have been caused in the past by meteor impact into the ocean. ^[31] Tsunami waves are so destructive due to the velocity of the approaching waves, the height of the waves when they reach land, and the debris the water entrains as it flows over land can cause further damage. ^{[30] [32]}

Depending on the magnitude of the tsunami waves and floods, it could cause severe injuries which call for precautionary interventions that prevent overwhelming aftermaths. It was reported that more than 200,000 people were killed in the earthquake and subsequent tsunami that hit the Indian Ocean, on December 26, 2004. ^[33] Not to mention, several diseases are a result of floods ranging from hypertension to chronic obstructive pulmonary diseases. ^[33]

Mitigation and adaptation

Further information: Climate change adaptation § Flooding

This section is an excerpt from Flood control.[ edit ]

A weir was built on the Humber River (Ontario) to prevent a recurrence of a catastrophic flood.

Flood control (or flood mitigation or flood protection or flood alleviation) methods are used to reduce or prevent the detrimental effects of flood waters. ^{[34] [35]} Flood relief methods are used to reduce the effects of flood waters or high water levels. Flooding can be caused by a mix of both natural processes, such as extreme weather upstream, and human changes to waterbodies and runoff. A distinction is made between structural and non-structural flood control measures. Structural methods physically restrain the flood waters, whereas non-structural methods do not. Building hard infrastructure to prevent flooding, such as flood walls, is effective at managing flooding. However, increased best practice within landscape engineering is to rely more on soft infrastructure and natural systems, such as marshes and flood plains, for handling the increase in water. To prevent or manage coastal flooding, coastal management practices have to handle natural processes like tides but also the human-caused sea level rise.

Flood control and relief is a particularly important part of climate change adaptation and climate resilience. Both sea level rise and changes in the weather (climate change causes more intense and quicker rainfall) mean that flooding of human infrastructure is particularly important the world over. ^[36]

In environmental engineering, flood control involves the management of flood water movement, such as redirecting flood run-off through the use of floodwalls and flood gates, rather than trying to prevent floods altogether. It also involves the management of people, through measures such as evacuation and dry/wet proofing properties. The prevention and mitigation of flooding can be studied on three levels: on individual properties, small communities, and whole towns or cities.

Non-structural mechanism

If human systems are affected by flooding, an adaption to how that system operates on the coast through behavioral and institutional changes is required, these changes are the so-called non-structural mechanisms of coastal flooding response. ^[37]

Building regulations, coastal hazard zoning, urban development planning, spreading the risk through insurance, and enhancing public awareness are some ways of achieving this. ^{[5] [37] [38]} Adapting to the risk of flood occurrence can be the best option if the cost of building defense structures outweighs any benefits or if the natural processes in that stretch of coastline add to its natural character and attractiveness. ^[8]

A more extreme and often difficult to accept the response to coastal flooding is abandoning the area (also known as managed retreat) prone to flooding. ^[10] This however raises issues for where the people and infrastructure affected would go and what sort of compensation should/could be paid.

Engineered defenses

Groynes are engineered structures that aim to prevent erosion of the beach front

There are a variety of ways in which humans are trying to prevent the flooding of coastal environments, typically through so-called hard engineering structures such as flood barriers, seawalls and levees. ^{[8] [39]} That armouring of the coast is typical to protect towns and cities which have developed right up to the beachfront. ^[8] Enhancing depositional processes along the coast can also help prevent coastal flooding. Structures such as groynes, breakwaters, and artificial headlands promote the deposition of sediment on the beach thus helping to buffer against storm waves and surges as the wave energy is spent on moving the sediments in the beach than on moving water inland. ^[39]

Natural defenses

Mangroves are one of the coasts natural defense systems against storm surges and flooding. Their high biomass both above and below the water can help dissipate wave energy.

The coast does provide natural protective structures to guard against coastal flooding. These include physical features like gravel bars and sand dune systems, but also ecosystems such as salt marshes and mangrove forests have a buffering function. Mangroves and wetlands are often considered to provide significant protection against storm waves, tsunamis, and shoreline erosion through their ability to attenuate wave energy. ^{[6] [32]} To protect the coastal zone from flooding, the natural defenses should, therefore, be protected and maintained.

Longer term aspects and research

Reducing global sea-level rise is said to be one way to prevent significant flooding of coastal areas at present times and in the future. This could be minimised by further reducing greenhouse gas emissions. However, even if significant emission decreases are achieved, there is already a substantial commitment to sea-level rise into the future. ^[5] International climate change policies like the Kyoto Protocol are seeking to mitigate the future effects of climate change, including sea-level rise. In addition, more immediate measures of engineered and natural defenses are put in place to prevent coastal flooding.

There is a need for future research into:^{[ citation needed ]}

• Management strategies for dealing with the forced abandonment of coastal settlements
• Quantifying the effectiveness of natural buffering systems, such as mangroves, against coastal flooding
• Better engineering design and practices or alternative mitigation strategies to engineering

Impacts

Social and economic impacts

The coastal zone (the area both within 100 kilometres distance of the coast and 100 metres elevation of sea level) is home to a large and growing proportion of the global population. ^{[5] [7]} Over 50 percent of the global population and 65 percent of cities with populations over five million people are in the coastal zone. ^[40] In addition to the significant number of people at risk of coastal flooding, these coastal urban centres are producing a considerable amount of the global Gross Domestic Product (GDP). ^[7]

People's lives, homes, businesses, and city infrastructure like roads, railways, and industrial plants are all at risk of coastal flooding with massive potential social and economic costs. ^{[41] [42] [43]} The recent earthquakes and tsunami in Indonesia in 2004 and in Japan in March 2011 clearly illustrate the devastation coastal flooding can produce. Indirect economic costs can be incurred if economically important sandy beaches are eroded resulting in a loss of tourism in areas dependent on the attractiveness of those beaches. ^[38]

Environmental impacts

Coastal flooding can result in a wide variety of environmental impacts on different spatial and temporal scales. Flooding can destroy coastal habitats such as coastal wetlands and estuaries and can erode dune systems. ^{[10] [5] [38] [40]} These places are characterized by their high biological diversity therefore coastal flooding can cause significant biodiversity loss and potentially species extinctions. ^[30] In addition to this, these coastal features are the coasts natural buffering system against storm waves; consistent coastal flooding and sea-level rise can cause this natural protection to be reduced allowing waves to penetrate greater distances inland exacerbating erosion and furthering coastal flooding. ^[5] "By 2050, “moderate” (typically damaging) flooding is expected to occur, on average, more than 10 times as often as it does today, and can be intensified by local factors." ^[44]

Prolonged inundation of seawater after flooding can also cause salination of agriculturally productive soils thus resulting in a loss of productivity for long periods of time. ^{[1] [38]} Food crops and forests can be completely killed off by salination of soils or wiped out by the movement of floodwaters. ^[5] Coastal freshwater bodies including lakes, lagoons, and coastal freshwater aquifers can also be affected by saltwater intrusion. ^{[10] [5] [40]} This can destroy these water bodies as habitats for freshwater organisms and sources of drinking water for towns and cities. ^{[5] [40]}

Examples

The Thames Barrier provides flood control for London, U.K.

Significant flooding in New Orleans as a result of Hurricane Katrina and the failure of the city's flood protection systems

Examples of countries with existing coastal flooding problems include:

• The Netherlands: Flood control in the Netherlands
• Bangladesh: Floods in Bangladesh
• Great Britain: The Thames Barrier is one of the world's largest flood barriers and serves to protect London from flooding during exceptionally high tides and storm surges. ^{[40] [45]} The Barrier can be lifted at high tide to prevent sea waters flooding London and can be lowered to release stormwater runoff from the Thames catchment.
• New Zealand: Flooding of the low-lying coastal zone South Canterbury Plains in New Zealand can result in prolonged inundation, which can affect the productivity of the affected pastoral agriculture for several years. ^[1]

Hurricane Katrina in New Orleans

Hurricane Katrina made landfall as a category 3 cyclone on the Saffir–Simpson hurricane wind scale, indicating that it had become an only moderate level storm. ^[13] However, the catastrophic damage caused by the extensive flooding was the result of the highest recorded storm surges in North America. ^[13] For several days prior to the landfall of Katrina, wave setup was generated by the persistent winds of the cyclonic rotation of the system. This prolonged wave set up coupled with the very low central pressure level meant massive storm surges were generated. ^[46] Storm surges overtopped and breached the levees and floodwalls intended to protect the city from inundation. ^{[6] [13] [46]} Unfortunately, New Orleans is inherently prone to coastal flooding for a number of factors. Firstly, much of New Orleans is below sea level and is bordered by the Mississippi River therefore protection against flooding from both the sea and the river has become dependent on engineered structures. Land-use change and modification to natural systems in the Mississippi River have rendered the natural defenses for the city less effective. Wetland loss has been calculated to be around 1,900 square miles (4,920 square kilometres) since 1930. This is a significant amount as four miles of wetland are estimated to reduce the height of a storm surge by one foot (30 centimeters). ^[6]

A village near the coast of Sumatra lies in ruin on 2 January 2005 after the devastating tsunami that struck on Boxing Day 2004

Indonesia and Japan earthquake-related tsunamis

Further information: List of tsunamis

2004 Indian Ocean earthquake and tsunami: An earthquake of approximately magnitude 9.0 struck off the coast of Sumatra, Indonesia causing the propagation of a massive tsunami throughout the Indian Ocean. ^[32] This tsunami caused significant loss of human life, an estimate of 280,000 – 300,000 people has been reported ^[30] and caused extensive damage to villages, towns, and cities and to the physical environment. The natural structures and habitats destroyed or damaged include coral reefs, mangroves, beaches, and seagrass beds. ^[32] The more recent earthquake and tsunami in Japan in March 2011 (2011 Tōhoku earthquake and tsunami) also clearly illustrates the destructive power of tsunamis and the turmoil of coastal flooding.

See also

• Coastal flood advisory, watch, warning (U.S.)
• Coastal management
• Flash flood
• Saltwater intrusion

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External links

• Global floodmap
• Riskmap