What is a anabranch in geography?

What is a anabranch in geography?

(ˈɑːnəˌbrɑːntʃ) n. (Physical Geography) a stream that leaves a river and enters it again further downstream.

How do anabranching rivers form?

Anabranching can result from a one-off event, such as a channel dividing to pass an obstruction, but others may form with no obvious triggering event. The nature of arid regions of the Australian continent and its climate predispose it to forming anabranching rivers like nowhere else on Earth.

What is an Anabranching river?

Anabranching rivers consist of multiple channels separated by vegetated semi-permanent alluvial islands excised from existing floodplain or formed by within-channel or deltaic accretion. Type 4 are sand-dominated, ridge-forming rivers characterized by long, parallel, channel-dividing ridges.

What is a wandering river?

A fluvial channel with alternate stable single-channel reaches, and unstable multi-channel sedimentation zones. This term has also been applied to channels which are midway between meandering and braiding.

What is stream stage?

Stream stage is an important concept when analyzing how much water is moving in a stream at any given moment. “Stage” is the water level above some arbitrary point in the river and is commonly measured in feet. With modern technology, the USGS can monitor the stage of many streams almost instantly.

What is the difference between flow and discharge?

The amount of fluid passing a section of a stream in unit time is called the discharge. If v is the mean velocity and A is the cross sectional area, the discharge Q is defined by Q = Av which is known as volume flow rate. Discharge is also expressed as mass flow rate and weight flow rate.

What is stream channel geometry?

The geometry of a stream channel is controlled by both water and sediment movement, which reflect regional climate, geology , and human land use in a given drainage basin.

What is an anastomosing stream?

Anastomosing rivers constitute an important category of multi-channel rivers on alluvial plains. Therefore, the following definition, which couples floodplain geomorphology and channel pattern, is proposed in this paper: An anastomosing river is composed of two or more interconnected channels that enclose floodbasins.

Are braided streams fast?

Braided rivers are characterized by their fast flow and steep gradients, forming when the bedload sediment is high compared to the suspended load. They form a network of many branches within a channel.

What is an anabranch of a river called?

A distributary is a branch of a river that does not rejoin the main channel; these are common on and near river deltas. A bayou is often an anabranch. An anabranch that gets cut off from the main channel becomes an oxbow lake.

What is an anabranch in Alaska?

Anabranches at the junction of the Yukon River and the Koyukuk River in Alaska, August 24, 1941. An anabranch is a section of a river or stream that diverts from the main channel or stem of the watercourse and rejoins the main stem downstream.

What are the characteristics of anabranch landforms?

Anabranch landforms have 2 main characteristics: Watercourse leaves main flow of a stream or river. Rejoins later down the stream.

What is the difference between a braided river and distributary?

The term braided river describes watercourses which are divided by small islands into multiple channel threads within a single main channel, but the term does not describe the multiple channels of an anabranching river. A distributary is a branch of a river that does not rejoin the main channel; these are common on and near river deltas .

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