River dominated delta
River-dominated deltas (also known as "Gilbert deltas") often occur on sea coasts that have only a small tidal range , and at river mouths in inland lakes , i.e. where the receiving water has only few currents . So there is hardly any sediment shifting .
Morphological characteristics are:
- a pronounced sediment fan that slowly builds up
- heavily branched flow channels (formation of oxbow lakes)
River-dominated deltas have the classic shape of the Greek letter ∆, from which the name is derived. Like all river deltas, they are characterized by a slight gradient .
A special form of the river delta is the bird's foot delta . It arises from episodic movements of the main flow channel over the delta level (e.g. Mississippi Delta ). Marshes usually form between the estuary arms .
See also
- Tidal delta
- Wave-dominated delta (strong currents parallel to the coast)
literature
- Frank Ahnert, Introduction to Geomorphology, 4th edition, 2009, ISBN 978-3-8001-2907-2 (Ulmer) / ISBN 978-3-8252--8103-8 (UTB), chap. 17.2 deltas
Individual evidence
- ^ Gilbert, GK (1886). The Topographic Features of Lake Shores, In US Geological survey. 5th annual report, Washington, 1885. Retrieved from https://books.google.de/books/about/The_Topographic_Features_of_Lake_Shores.html?id=rhNTAAAAcAAJ