Classifying Estuaries: By Geology - Estuaries Tutorial
The four major types of estuaries classified by their geology are drowned river valley, bar-built, tectonic, and fjords. In geologic time, which is often measured on scales of hundreds of thousands to millions of years, estuaries are often fleeting features of the landscape.
Estuary - Wikipedia
An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. [1] Estuaries form a transition zone between river environments and maritime environments and are an example of an ecotone.
Estuary | Coastal Features, Marine Life & Conservation | Britannica
2024年12月4日 · Estuary, partly enclosed coastal body of water in which river water is mixed with seawater. In a general sense, the estuarine environment is defined by salinity boundaries rather than by geographic boundaries. The term estuary is derived from the Latin words aestus (“the tide”) and aestuo (“boil”),
Estuary - Salinity, Tides, Sedimentation | Britannica
The geomorphology of an estuarine basin is usually developed by one of three agents: (1) fluvial or glacial erosion, (2) fluvial and marine deposition, or (3) tectonic activity. The last of these involves the downfaulting of a coastal area or the broad local subsidence of a stretch of coastline, as in the case of San Francisco Bay.
Classifying Estuaries: By Water Circulation
The five major types of estuaries classified according to their water circulation include salt-wedge, fjord, slightly stratified, vertically mixed, and freshwater. Water movements in estuaries transport organisms, circulate nutrients and oxygen, and transport sediments and wastes.
Geology, Morphology, and Sedimentology of Estuaries and Coasts
2011年12月31日 · Estuaries show a marked tripartite longitudinal zonation that is independent of tidal range. Both lower and upper estuaries are sandy and/or gravely, bioclastic material being restricted to the...
Chapter 1 Geomorphology and Sedimentology of Estuaries: An …
1995年1月1日 · Geomorphology is concerned with the study of earth-surface forms and with their evolution in time and space because of the physicochemical and biological factors acting on them. Most of the evolution is the product of a cyclic process based on erosion transport-deposition of sediment particles.
The geomorphology of UK estuaries: The role of geological …
2014年10月5日 · From a geomorphological and sedimentological standpoint, the following features differentiate an estuary from a tidal inlet: (1) the presence of a tidally-influenced freshwater reach at the head of an estuary; (2) a marked lateral salinity gradient seawards of the estuary head which causes flocculation of fine sediment brought down by the river ...
Geology and Sedimentary History of Modern Estuaries
2017年2月15日 · An understanding of the geology and geomorphology of estuaries allows the types and location of specific sediment to be predicted, and so aids in undertaking estuarine research. The scheme we are describing in this chapter is based primarily on an understanding of the visible surface features of estuaries.
Encyclopedia of Estuaries - SpringerLink
2015年8月14日 · The Encyclopedia of Estuaries, part of Springer's Encyclopedia of Earth Sciences Series, provides a single, state-of-the-art, comprehensive reference volume on estuaries for research scientists, educators, students, and others.
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