At the interface between the ocean and earth, mangroves play a fundamental role in reducing monsoon flooding. D. E. Marois and W. J. Mitsch, Coastal protection from tsunamis and cyclones provided by mangrove wetlandsâa review. The formal institutions and governance structures that many of the current restoration and replanting efforts operate through ignore these. 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To protect Indian nuclear reactors from the fury of tsunamis of the kind that has hit Japan, eminent agriculture scientist M S Swaminathan has suggested that the government promote the growth of mangroves and similar other 'bio-shields' along the coast adjoining the atomic energy installations. against tsunami during 2004. 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. 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 … Mangroves have a complex root system that efficiently dissipates seawave energy protecting the coastal areas from tsunamis, storm surge, and soil erosion. 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. 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. The tsunami had only a small impact on lagoons that show no cryptic ecological degradation (sites 2, 3, 23 and 24) or that are protected by the distance from the shore and by frontal Rhizophora spp. Mangroves provide essential habitat and coastline protection but are under threat. The ‘mangrove status’ is a combination of pre-tsunami aerial extent of the front mangrove and pre-tsunami mangrove destruction (see text). Itâs 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. 220.127.116.11 Mangroves are shrubs and trees that grow in coastal saline waters in the tropics, where the water temperature is above 20 degrees Celsius. Although there was significant loss of life, with an estimated 227,000 people killed, scientists have since concluded that the tragedy would have been much worse if mangrove forests were absent. fringes (sites 17, 18 and 21). P. Nehru and P. Balasubramanian, Re-colonizing mangrove species in tsunami devastated habitats at Nicobar Islands, India. Having just returned from a study of mangrove forests in Vietnam, we found those living alongside the mangroves use them as a source of food (fish, crabs, clams, worms, octopus, shrimps, jellyfish), either subsisting from them or using their natural resources as a safety net when other food supplies fail. It adds to a growing debate on using mangroves as bioshields in coastal areas. The communities use various formal and informal rules and practices to govern and manage the mangroves. Exhibition Video Shows How Mangroves Can Protect Coastal Areas From Tsunami The depleting mangroves around the world have caused major environmental concern since they work as a carbon sink and remove carbon dioxide from the atmosphere. 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. Effectiveness of mangrove forests to protect . (Credit: National Park Service), Mangrove forests provide protection against tsunamis. Usually mangrove forest do not slow down coastal erosion, however they may enhance coastal accretion. University of Leeds provides funding as a founding partner of The Conversation UK. 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). Another found that a 100-m-wide band of dense mangrove growth could reduce … Mangroves grow in partially flooded sediments along thousands of kilometers of the world’s tropical coastlines. Researchers say mangroves absorbed the impact of the tsunami Healthy mangrove forests helped save lives in the Asia tsunami disaster, a new report has said. 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. My question is: Why are we destroying them? They protect the coasts against storm surges and tsunamis. 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). 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. Mangrove forests t hrive in the intertidal zones o f tropical . M. Maza, J. L. Lara, and I. J. Losada, Tsunami wave interaction with mangrove forests: A 3-D numerical approach. If the long-term sustainability of any replanting investment is to be assured, then it is vital to understand how the mangroves will be used once the short-term cash to communities for assisting replanting is gone, so that the new forests are not exploited unsustainably. There is growing evidence that mangroves’ dense root and branch networks are very important for protecting coastal areas, because they can absorb wave energy. Supercyclone Amphan is the first tropical cyclone to have hit the Indian Coast this summer. AccessScience Editors, DOI:https://doi.org/10.1036/1097-8542.BR0601171, 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. Replanting damaged areas will depend on the nature of damage caused, the geography, and extent of infrastructure development in the area. 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). 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. Copyright © McGraw-Hill Global Education Holdings, LLC. 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. Why trees and not, say, concrete? Briefing by: This is largely due to land clearance for agriculture and fish farming, major coastal development, rapid urbanisation, and pollution. 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. These multi-million dollar investments havenât always been successful though â itâs not as straightforward as just planting trees. This is a short but very explicit video showing how mangroves protect us from tsunamis. Such floods typically have devastating impacts on both land and human-made structures. P. S. Kumar, Does mangrove serve as bioshield against strong cyclone, storm and tsunami?. Professor in Environment and Development, Director, Sustainability Research Institute, University of Leeds. Mangroves reduce wave height by as much as 66 percent over 100 meters of forest providing a vital buffer against the impacts of storms, tsunamis, … 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. “They are very important for protecting coastal areas, because they can absorb wave energy,” he says. 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. Copyright © 2010â2020, The Conversation US, Inc. 18.104.22.168, Red mangroves thriving in southern Florida at Big Cypress National Preserve. high water events (storms, tsunamis). Your IP information is Mangroves certainly offer a means to mitigate climate change, conserve biodiversity, and provide a wide range of goods and services as well as protecting coasts against erosion and storm surges. But unless planted and managed carefully, those who depend most upon the mangroves for their survival could lose out. They have several ecological and physical functions that are essential in maintaining biodiversity and protecting populations of humans and animals. 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 … 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 80â100%.