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Mudflats or mud flats, also known as tidal flats or, in Ireland, slob or slobs, are that form in intertidal areas where sediments have been deposited by or . A global analysis published in 2019 suggested that tidal flat ecosystems are as extensive globally as , covering at least of the Earth's surface. / They are found in sheltered areas such as , , , and estuary; they are also seen in freshwater and salt lake (or inland seas) alike, wherein many rivers and Stream end. Mudflats may be viewed geology as exposed layers of bay mud, resulting from deposition of estuarine , and aquatic animal detritus. Most of the sediment within a mudflat is within the intertidal zone, and thus the flat is submerged and exposed approximately twice daily.
A recent global remote sensing analysis estimated that approximately 50% of the global extent of tidal flats occurs within eight countries (Indonesia, China, Australia, United States, Canada, India, Brazil, and Myanmar) and that 44% of the world's tidal flats occur within Asia (). A 2022 analysis of tidal wetland losses and gains estimates that global tidal flats experienced losses of between 1999 and 2019, which were largely offset by global gains of over the same time period.
In the past tidal flats were considered unhealthy, economically unimportant areas and were often dredged and developed into agricultural land. Some mudflats can be extremely treacherous to walk on. For example, the mudflats surrounding Anchorage, Alaska, are made from fine glacial-silt which does not easily separate out its water, and, although seemingly solid, can quickly gel and become like quicksand when disturbed by stepping on it. Four people are known to have become stuck up to their waists and drowned when the tide came in, and many others are rescued from the Anchorage mudflats each year. Associated Press - Man dies on Alaskan Mudflat
On the Baltic Sea coast of Germany in places, mudflats are exposed not by tidal action, but by wind-action driving water away from the shallows into the sea. This kind of wind-affected mudflat is called Windwatt in German.
The maintenance of mudflats is important in preventing coastal erosion. However, mudflats worldwide are under threat from predicted sea level rises, land claims for development, Dredge due to shipping purposes, and chemical pollution. In some parts of the world, such as East and South-East Asia, mudflats have been reclaimed for aquaculture, agriculture, and industrial development. For example, around the Yellow Sea region of East Asia, more than 65% of mudflats present in the early 1950s had been destroyed by the late 2000s.
/ It is estimated that up to 16% of the world tidal flats have disappeared since the mid-1980s.
Mudflat sediment deposits are focused into the intertidal zone which is composed of a barren zone and marshes. Within these areas are various ratios of sand and mud that make up the sedimentary layers.
Barren zones extend from the lowest portion of the intertidal zone to the marsh areas. Beginning in close proximity to the tidal bars, sand dominated layers are prominent and become increasingly muddy throughout the tidal channels. Common bedding types include laminated sand, ripple bedding, and bay mud. Bioturbation also has a strong presence in barren zones.
Marshes contain an abundance of while the sediment layers consist of thin sand and mud layers. are a common as well as wavy bedding planes. Marshes are also the origins of coal/peat layers because of the abundant decaying plant life.
Salt pans can be distinguished in that they contain thinly laminated layers of clayey silt. The main source of the silt comes from rivers. Dried up mud along with wind erosion forms silt dunes. When flooding, rain or tides come in, the dried sediment is then re-distributed.
Ecology
Tidal flats, along with intertidal and mangrove forests, are important . They usually support a large population of wildlife,Aldea, K. (2022). The Unvegetated Tidal Flats in Catanduanes Island, Philippines: Current and Future Trends. In T. Shinbo, S. Akama & S. Kubota (Eds.), " Interdisciplinary Studies for Integrated Coastal Zone Management in the Region along the Kuroshio: Problem-Based Approach by Kuroshio Science"
/ref> and are a key habitat that allows tens of millions of migratory shorebirds to migrate from breeding sites in the northern hemisphere to non-breeding areas in the southern hemisphere. They are often of vital importance to , as well as certain species of ,Triño, A. T., & Rodriguez, E. M. (2000). Mud crab (Scylla serrata) culture in tidal flats with existing mangroves. In J. H. Primavera, M. T. Castaños, & M. B. Surtida (Eds.), Mangrove-Friendly Aquaculture: Proceedings of the Workshop on Mangrove-Friendly Aquaculture organized by the SEAFDEC Aquaculture Department, January 11–15, 1999, Iloilo City, Philippines
/ref> and fish. In the United Kingdom mudflats have been classified as a Biodiversity Action Plan priority habitat.
(1980). 9780387101897, Springer-Verlag. ISBN 9780387101897 The associated growth of coastal sediment deposits can be attributed to rates of subsidence along with rates of deposition (example: silt transported via river) and changes in sea level.
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