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how do mangroves protect the coast from tsunamis

Such floods typically have devastating impacts on both land and human-made structures. See also: Deforestation; Earthquake; Ocean waves; Root (botany); Tsunami, Unfortunately, the role of mangroves as living barriers has not always been appreciated, and many mangrove forests have fallen prey to developers without regard to the environmental effects. Mangroves are shrubs and trees that grow in coastal saline waters in the tropics, where the water temperature is above 20 degrees Celsius. Professor in Environment and Development, Director, Sustainability Research Institute, University of Leeds. Mangrove forests reduce the impact of tsunamis by reducing both the height and the velocity of the incoming waves, and by distributing water among the canals and creeks of the mangroves, thus decreasing the level of inundation. AccessScience Editors, DOI:, Mangrove forests are taxonomically diverse assemblages of trees and shrubs that form the dominant plant communities in tidal, saline wetlands along sheltered tropical and subtropical coasts. ing tsunami events. The ‘mangrove status’ is a combination of pre-tsunami aerial extent of the front mangrove and pre-tsunami mangrove destruction (see text). In places like this stretch of Ecuadorian coast near the city of Guayaquil, losing the mangroves would portend the loss of the mud crabs—the primary source of income for some local fishing communities—and have a severe impact on surrounding ecosystems as well. Mangroves provide essential habitat and coastline protection but are under threat. Your IP information is Recent research has revealed that mangroves, along with salt marshes and other wetlands, can sequester carbon much more permanently and effectively than terrestrial forests, offering an important means to mitigate global climate change. For example, studies analyzing the effects of tsunamis on shoreline areas have determined that mangroves suffering from various types of ecological degradation were less resistant than unaltered pristine mangroves. against tsunami during 2004. Efforts to plant and replant more mangroves, such as those planned in the Philippines, are laudable. They have several ecological and physical functions that are essential in maintaining biodiversity and protecting populations of humans and animals. Mangroves grow in partially flooded sediments along thousands of kilometers of the world’s tropical coastlines. Additional credits and copyright information. The extent to which mangroves reduce the damage caused by typhoons (as well as tsunami) is still debated, but the evidence suggests that mangroves provide an effective natural buffer against storms, flooding, coastal erosion and strong waves. The study also found that beach forest trees that had been planted to protect against typhoons (as hurricanes are called in the region) helped protect land. To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible. The dense tree root system keeps the sediment carried from the soil above from pouring into the ocean all at once, which stabilizes the banks, protects the corals from choking, reduces turbidity, and filters and traps pollutants. Researchers in the Andaman Islands in the Indian Ocean found a remarkable situation: In areas that had pristine mangrove forests, only 7% of the villages hit by the tsunami were severely damaged; in contrast, in areas with mangrove degradation or elimination (chiefly as the result of development by tourist industries or aquaculture companies), the devastation of villages reached 80–100%. This is largely due to land clearance for agriculture and fish farming, major coastal development, rapid urbanisation, and pollution. They frequently reinforce existing power relations and inequalities, and fail to take into account the importance of community buy-in that can make or break ecological rehabilitation initiatives. This is a short but very explicit video showing how mangroves protect us from tsunamis. Coral reefs provide a physical barrier that reaches the sea surface, causing waves to break offshore and allowing them to dissipate most of their destructive energy before reaching the shore, while mangroves soak up destructive wave energy and acts as a buffer against erosion. But a clear understanding is needed of the mangrove forests’ role in underpinning the livelihoods of some of the poorest people living along the coast. Finally, detailed consideration needs to be given to the scale and distribution of costs and benefits linked to mangrove restoration and rehabilitation, not just in the Philippines, but globally. The finding follows a report published earlier this year (January) which said that mangroves were not effective against tsunamis (see Mangroves do not protect against tsunamis). An estimated 26 percent of mangroves have been destroyed around the Indian Ocean through conversion to farm fields, aquaculture ponds, or from other causes, exposing the coast to accelerated erosion. “They are very important for protecting coastal areas, because they can absorb wave energy,” he says. Thus, the preservation and recolonization of mangrove forests are necessary steps to ensure the barrier protection afforded by these strategic greenbelts against tsunami events. Write an article and join a growing community of more than 117,500 academics and researchers from 3,792 institutions. The finding follows a report published earlier this year (January) which said that mangroves were not effective against tsunamis (see Mangroves do not protect against tsunamis). One of the most important functions is to provide a barrier or buffer between the land and the sea, with mangroves protecting landward coastal zones against potentially devastating ocean events, including tsunamis. The struggle to save mangroves like these in Ecuador is a global challenge that no single government or organization can … Similar considerations apply in devising ways to protect the remaining mangrove areas, already drastically reduced by more than a third of their global extent. / Mangroves have a complex root system that efficiently dissipates seawave energy protecting the coastal areas from tsunamis, storm surge, and soil erosion. A study found villages … 1) Mangroves protect coastlines from tsunamis In 2004, an earthquake in the Indian Ocean triggered a catastrophic tsunami that battered shorelines across India and Southeast Asia. New Scientist: Following the 2004 tsunami in the Indian Ocean, several studies examined satellite data to determine the ability of mangrove forests to protect communities from the destructive effects of such seismic sea waves.One study found an 8% reduction in fatalities in villages protected by mangrove forests. Mangrove forests, common along tropical coasts, can provide a protective shield against destructive cyclones and reduce deaths, a study has found. For example, certain mangrove species can block or buffer wave action via their stems and aerial roots, which can measure 30 m (98 ft) in height. Mangrove ecosystems provide essential benefits and services for food security, maintaining fisheries and forest products, and protecting against storms, tsunamis, and rising sea levels, to preventing coastal erosion, regulating coastal water quality, and the provision of habitats for endangered marine species. Other investigations of smaller tsunami events since 2004 have reached similar conclusions. high water events (storms, tsunamis). Some researchers who are skeptical about the ability of mangroves to protect against tsunamis have noted that mangroves might be more capable of protecting against tropical storm surges (6, 10). Effectiveness of mangrove forests to protect . It’s important to develop a clear picture of who, what for, and how the mangroves are used and governed, as a pre-requisite to large-scale planting. The role of mangroves in coastal risk reduction 13 2.1 Mangroves reduce wave damage 14 2.2 Mangroves reduce damage from large storms 16 2.3 Mangroves can help to reduce tsunami damage 18 2.4 Mangroves reduce erosion and bind soils together 20 2.5 Mangroves may keep up with sea level rise 22 Section 3. But unless planted and managed carefully, those who depend most upon the mangroves for their survival could lose out. Copyright © McGraw-Hill Global Education Holdings, LLC. This is the finding of a controversial new scientific report, just published in the international journal, Estuarine and Coastal Shelf Science. The finding follows a … M. Maza, J. L. Lara, and I. J. Losada, Tsunami wave interaction with mangrove forests: A 3-D numerical approach. Mangrove trees' thickets of stilt-like roots protect coastal land from erosion and help mitigate the damage of tsunamis and hurricanes.They may also serve as a … As widely reported, extensive areas of mangroves can reduce the loss of life and damage caused by tsunamis by taking the first brunt of the impact and by dissipating the energy of the wave as it passes through the mangrove area. MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology, 115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms, 3000 biographies of notable scientific figures, MORE THAN 19,000 downloadable images and animations illustrating key topics, ENGAGING VIDEOS highlighting the life and work of award-winning scientists, SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research, LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information. Briefing by: They protect the coasts against storm surges and tsunamis. Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Reports suggest up to 80% of the money is likely to be channelled to residents to engage them in tree planting activities as part of the country’s cash-for-work programme. There is growing evidence that mangroves’ dense root and branch networks are very important for protecting coastal areas, because they can absorb wave energy. Steven Orchard receives funding through an Economic and Social Research Council (ESRC) scholarship. See also: Biodiversity; Biogeography; Coastal landforms; Ecological communities; Ecosystem; Mangrove; Wetlands, Tsunamis are long waves generated by major geologic events, including underwater earthquakes, landslides, and volcanic eruptions, which rapidly flood adjacent and distant coastlines and coastal communities. One study was conducted in the aftermath of the massive 2004 Indian Ocean earthquake and tsunami that devastated huge areas in Indonesia, Thailand, Sri Lanka, and India, as well as killing more than 230,000 people.

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