Alluvial fan definition
Alluvial fan means a geomorphologic feature characterized by a cone or fan-shaped deposit of boulders, gravel, and fine sediments that have been eroded from mountain slopes, transported by flood flows, and then deposited on the valley floors, and which is subject to flash flooding, high velocity flows, debris flows, erosion, sediment movement and deposition, and channel migration.
Alluvial fan means a geomorphologic feature characterized by a cone or fan shaped deposit of sediments that have been eroded from mountain slopes, transported by flood flows and then deposited in the valley floor and which are subject to flash flooding, high velocity flows, debris flows, erosion, sediment movement and deposition, and channel migration.
Alluvial fan means a low, outspread, relatively flat to gently sloping mass of loose alluvium, shaped like an open fan, deposited by a stream where it issues from a narrow valley, or where a tributary stream issues into the main stream, or wherever a constriction in a valley abruptly ceases or the gradient of the stream suddenly decreases; it is steepest near the mouth of the valley where its apex points upstream, and it slopes gently and convexly outward with gradually decreasing gradient.
Examples of Alluvial fan in a sentence
So 8 morphological situations, provided in the monograph (Plain, Valley centre, Valley edge, Alluvial fan, Saddle, Slope, Edge of scarp, Ridge), have been identified for 199 stations (Figure 7).
More Definitions of Alluvial fan
Alluvial fan means a desert phenomenon where streams emerge from canyons and deposit sand and rock in a cone-shaped formation fanning out from the canyon mouth.
Alluvial fan means an accumulation of sediment where a steep stream channel flows out onto a valley floor of reduced gradient, often fan-like in shape, subject to further additions of sediment;
Alluvial fan. “Alluvial fan flooding”: means flooding occurring on the surface of an alluvial fan, or similar landform, which originates at the apex and is characterized by: high-velocity flows, active processes of erosion, sediment transport, deposition, and unpredictable flow paths.
Alluvial fan means a fan-shaped deposit of sediment and organic debris formed where a stream flows or has flowed out of a mountainous upland onto a level plain or valley floor because of a sudden change in sediment transport capacity (e.g., significant change in slope or confinement).
Alluvial fan means a relatively flat to gently sloping mass of loose rock materials, shaped like an open fan or a segment of a cone, that has been deposited by a stream or debris flow at the place where it issues from a narrow mountain valley upon a plain or broad valley.
Alluvial fan means a fan shaped deposit where a fast-flowing stream flattens, slows, and spreads, typically at the exit of a canyon onto a flatter plan.
Alluvial fan means an area of land created by the deposit of soil and other matter by a watercourse or flooding caused by the watercourse, where the watercourse flattens, slows and spreads after issuing from a steep mountain valley or gorge on a plain or at the junction of a tributary watercourse with another watercourse;