Alluvial Fan
Alluvial fans are triangular-shaped deposits of water-transported material, often referred to as alluvium. They are an example of an unconsolidated sedimentary deposit and tend to be larger and more prominent in arid to semi-arid regions. These alluvial fans typically form in elevated or even mountainous regions where there is a rapid change in slope from a high to low gradient. The river or stream carrying the sediment flows at a relatively high velocity due to the high slope angle, which is why coarse material is able to remain in the flow. When the slope decreases rapidly into a relatively planar area or plateau, the stream loses the energy it needs to move its sediment. Deposition subsequently occurs and the sediment ultimately spreads out, creating an alluvial fan. Three primary zones occur within an alluvial fan which includes the proximal fan, medial fan, and the distal fan.
Delta (noun)
The fourth letter of the modern Greek alphabet Δ, δ.
Delta (noun)
A landform at the mouth of a river where it empties into a body of water.
“w|Nile Delta|Nile Delta”
Delta (noun)
The letter D in the ICAO spelling alphabet, which assigns words to letters of the alphabet.
Delta (noun)
The symbol Δ.
Delta (noun)
A small but noticeable effect. Compare epsilon.
“This will slow the main code path down, but only by delta.”
Delta (noun)
The set of differences between two versions of a file.
“When you update the file, the system will only save the deltas.”
Delta (noun)
The angle subtended at the center of a circular arc.
Delta (noun)
A type of cargo bike that has one wheel in front and two in back.
Delta (noun)
The closed figure produced by connecting three coils or circuits successively, end for end, especially in a three-phase system.
“delta winding; delta connection; delta current”
Delta (noun)
The rate of change in an option value with respect to the underlying asset’s price.
Delta (noun)
A value in delta notation indicating the relative abundances of isotopes.
Delta (noun)
the fourth letter of the Greek alphabet (Δ, δ), transliterated as ‘d’.
Delta (noun)
a fourth-class mark given for an essay, examination paper, or other piece of work.
Delta (noun)
the fourth in a series of items, categories, etc.
“delta hepatitis”
Delta (noun)
the fourth (usually fourth-brightest) star in a constellation
“Delta Cephei”
Delta (noun)
a record of the differences between two versions of a file
“updates will be delivered as delta updates instead of complete application downloads”
“the diff command can be used to generate the delta between two files”
Delta (noun)
a code word representing the letter D, used in radio communication.
Delta (noun)
a triangular tract of sediment deposited at the mouth of a river, typically where it diverges into several outlets
“the Nile delta”
“a huge delta system developed”