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General sketch-map of a tidal plain, showing the typical tripartition in supratidal, intertidal and subtidal zones. The most apparent character of the area is the development of tidal channels, affecting mainly the intertidal zone. In this case, the tidal flat is protected seaward by a beach barrier, but in many cases (low-energy waves and longshore currents) the tidal flats may directly pass into a shallow marine environment.

Mudflats or mud flats, also known as tidal flats, are coastal wetlands that form when mud is deposited by tides or rivers. They are found in sheltered areas such as bays, bayous, lagoons, and estuaries. Mudflats may be viewed geologically as exposed layers of bay mud, resulting from deposition of estuarine silts, clays and marine 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.

In the past tidal flats were considered unhealthy, economically unimportant areas and were often dredged and developed into agricultural land.[1] Several especially shallow mudflat areas, such as the Wadden Sea, are now popular among those practising the sport of mudflat hiking.

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. These wind-affected mudflats are called windwatts in German.


Mudflats near Oban on Stewart Island, New Zealand

Tidal flats, along with intertidal salt marshes and mangrove forests, are important ecosystems.[2] They usually support a large population of wildlife, 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 migratory birds, as well as certain species of crabs,[3] mollusks and fish.[4] In the United Kingdom mudflats have been classified as a Biodiversity Action Plan priority habitat.

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, dredging 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 have been destroyed over the past 50 years.[5][6]


Mudflat sediment deposits are focused into the intertidal zone which is composed of a barren zone, marsh and salt pan. Within these areas are various ratios of sand and mud that make up the sedimentary layers.[7] 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.[7]

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 herbaceous plants while the sediment layers consist of thin sand and mud layers. Mudcracks are a common as well as wavy bedding planes.[7] Marshes are also the origins of coal/peat layers because of the abundant decaying plant life.[7]

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.[7]

Selected example areas[edit]

Mudflats in Brewster, Massachusetts, United States, extending hundreds of yards offshore at the low tide. The line of seashells in the foreground indicates the high-water mark.
Gulls feeding on mudflats in Skagit Bay, Washington.


  1. ^ Dredging Indian River Lagoon Wetlands 1920 - 1950s
  2. ^ Tidal flat habitats
  3. ^ Mud crab (Scylla serrata) culture in tidal flats with existing mangroves
  4. ^ Manko - Tidal Flat, Mangrove Forest
  5. ^ MacKinnon, J.; Verkuil, Y.I.; Murray, N.J. (2012), IUCN situation analysis on East and Southeast Asian intertidal habitats, with particular reference to the Yellow Sea (including the Bohai Sea), Occasional Paper of the IUCN Species Survival Commission No. 47, Gland, Switzerland and Cambridge, UK: IUCN, p. 70, ISBN 9782831712550 
  6. ^ Murray, N.J.; Clemens, R.S.; Phinn, S.R.; Possingham, H.P.; Fuller, R.A. (2014), "Tracking the rapid loss of tidal wetlands in the Yellow Sea", Frontiers in Ecology and the Environment 12 (5): 267–272, doi:10.1890/130260 /
  7. ^ a b c d e Reineck, H.E, and I.B Singh, Deposistional Sedimentary Enviornments, 2nd Ed. New York: Springer-Verlag Berlin Heidelberg, 1980, pp. 418-428

External links[edit]

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Mudflat — Please support Wikipedia.
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16 news items

Bellingham Herald

Bellingham Herald
Wed, 17 Sep 2014 08:00:00 -0700

The Mudflat Walkers, featuring singer Matney Cook, hosts an all-ages CD release party for the band's new recording, “Sky Valley High,” at 7 p.m. Friday, Sept. 19, at Bellingham Circus Guild's Cirq Lab, 1401 Sixth St. The evening includes food vendors ...


Sat, 27 Sep 2014 09:07:38 -0700

It was Adelson who envisioned that disused mudflat could give land-starved Macau room to create an Asian version of the Las Vegas Strip. Wynn Resorts Wynn Resorts founder Steve Wynn and Terry Lanni, CEO of MGM International Resorts' predecessor ...

The Epoch Times

The Epoch Times
Mon, 29 Sep 2014 02:11:15 -0700

Upon first sighting, the beach appears to be a mudflat and I was wondering what the fuss was about. Once on the beach though the sand is as soft and pleasant to walk an as any white sandy beach of your tropical dreams. After a long beach walk I began ...
BostInno (blog)
Mon, 15 Sep 2014 10:14:58 -0700

East Broadway Foodie Crawl - 5:45 p.m. - Somerville's East Broadway District - Take a cultural food crawl through the East Broadway District in Somerville, starting at either Mudflat or Louie's Ice Cream and popping around to different culinary stops ...
Bellingham Herald
Sat, 06 Sep 2014 16:03:45 -0700

Upper Bagley has more depth which holds the majority of the trout, but a fair number patrol the mudflat like shallows of its west end. Because of their ease of access, both Bagleys are candidates for fishing from small floating conveyances. Bagley ...
Anguilla LNT
Wed, 24 Sep 2014 06:07:30 -0700

He explains that the characteristics that made the Great Salt Pond attractive to people for salt production–like being a large, shallow saline environment with a water level that rises and falls to leave exposed mudflat areas–also make it attractive to ...
Dredging Today
Fri, 12 Sep 2014 01:15:00 -0700

On September 3, CCCC Shanghai Dredging Co., Ltd. won the bid for the EPC contract for the mudflat surfacing project in Taizhou East New Area, Zhejiang Province, with a total construction period of 30 months. The project is located in the east of ...

Gazette Live

Gazette Live
Wed, 10 Sep 2014 01:50:49 -0700

The wetlands are beginning to establish as a dynamic inter-tidal environment, creating a significant new area of saltmarsh and mudflat, which will form an important haven for the area's wildlife and bird populations. A new public footpath along the top ...

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