alluvial fan

American  

noun

Physical Geography.

1. a fan-shaped alluvial deposit formed by a stream where its velocity is abruptly decreased, as at the mouth of a ravine or at the foot of a mountain.

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alluvial fan British  

noun

1. a fan-shaped accumulation of silt, sand, gravel, and boulders deposited by fast-flowing mountain rivers when they reach flatter land

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alluvial fan Scientific  

/ ə-lo̅o̅′vē-əl /

1. A fan-shaped mass of sediment, especially silt, sand, gravel, and boulders, deposited by a river when its flow is suddenly slowed. Alluvial fans typically form where a river pours out from a steep valley through mountains onto a flat plain. Unlike deltas, they are not deposited into a body of standing water.

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Etymology

Origin of alluvial fan

First recorded in 1870–75

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Example Sentences

See Examples For:

alluvial fan

According to the California Department of Water Resources, the state experiences many types of flooding, including alluvial fan, riverine, coastal, flash, and localized floods, as well as debris flows and tsunamis.

From Los Angeles Times ● Sep. 9, 2022

A man stands on an alluvial fan below Tumacacori mountain, a few dozen miles north of here.

From The Guardian ● Mar. 1, 2017

As distributary channels fill with sediment, the stream is diverted laterally, and the alluvial fan develops into a cone shape with distributaries radiating from the canyon mouth.

From Textbooks ● Jan. 1, 2017

The trip I joined was part of a 67-day, 1,058-mile “first,” paddling the Cuito tributary of the Okavango river, which rises in the Angolan Highlands before tipping through Namibia into the alluvial fan in Botswana.

From The Wall Street Journal ● Jul. 30, 2015

Owing to the scarcity of arable land he was obliged to cultivate such pampas as he could find—one an alluvial fan near his house, another a natural terrace near the river.

From Inca Land Explorations in the Highlands of Peru by Hiram Bingham

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