Delta is: Definition, Morphology and Types
Delta is: Definition, Morphology and Types - On this occasion About Knowledge will discuss about Delta. Which in this discussion explains the meaning of delta, according to experts, its morphology, terms and types briefly and clearly. For more details, see the following article.
Delta is: Definition, Morphology and Types
The definition of delta is a deposition formed due to the activity of rivers and river mouths which results in irregular progradation of the coastline.
Delta According to Experts
In order to better understand the definition of delta, the following is the meaning of delta according to experts, including:
According to Coleman, Scott and Fischer
According to him, a delta is a deposition formed due to the activity of rivers and river mouths. Where this activity results in the emergence of sedimentary deposits resulting in irregular progradation and this occurs on the coastline.
According to Elliot and Allen
According to him, the definition of a delta is a part of the coast that is more indented into the sea. Where in this section it is formed from the presence of a river sedimentation deposit that enters the lake, these lagoons, seas and sediments have a large volume of distribution capabilities return.
According to Boggs
According to him, the notion of a delta is a deposit formed by a fluvial sedimentation process entering an area of still water.
From the above understanding it can be concluded that the delta is a sedimentation deposit of particles caused by things carried by the river. Sedimentation is an exogenous force that can create new faces on the earth's surface.
Delta morphology
From several existing definitions, then we will discuss the morphology of the delta. There are several delta morphologies that can be found around us, including:
Delta Plains
Delta plain is a delta region that is dominated by deposits and sediments that come from land rather than from the sea. The closest land area is called the delta plain.
The delta plain then turns into a swamp area and usually this area is dominated by fine grain materials such as organic shale and coal. Delta plain is a watershed area, precisely the flow before entering the sea area. This includes brackish areas which are areas where seawater and rivers meet.
DeltaFront
The delta front is a delta area that is quite active in deposition, dominated by sand. In addition, the delta front is one of the areas that is in direct contact with all activities from the sea.
The formation of the delta front requires quite a long time. This area can usually be found in areas around the entry of river water and sea water. Please note that the delta front is still a part of the plain delta.
Prodelta
The prodelta area is the most distant area among the other deltas. The area is almost said to be more indented into the sea area. In order to know the area of the prodelta, we need several samples or samples from the underwater layers around the delta. Because the prodelta area has very fine material, it is difficult to know without using a sample.
Conditions for Delta Occurrence
Below are some of the conditions for a delta to occur, including the following:
- Ocean currents are very small.
- The rock material deposited in seas and lakes is quite large over time.
- There is a river that closes the lake and the sea.
- The flow of currents on the ebb and flow of the sea is not strong.
- There is no tectonic movement causing subsidence in the seabed and the lake where the river flows.
Delta type
There are several types of deltas that you need to know, including:
Delta Loben
This delta is a formation of selta that resembles a bird's foot. The rate of formation of this delta is quite fast, because the sedimentation process is also fast.
Blunt Delta
This delta is a type that has a shape resembling an arc besides that the formation of this delta tends not to change or stagnate.
Sharp Delta
This delta is a type of delta that has a cone-like shape, where the development of its formation gets narrower and narrower.
Delta Estuary
This delta is the type of delta at the lower part of the river mouth that you often find.
Thus the explanation about Delta is: Definition, Morphology and Types. Hopefully it can be useful and add to your insight. Thank You.
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