Alluvial fan | Process, Characteristics & Types | Britannica
Alluvial fan, unconsolidated sedimentary deposit that accumulates at the mouth of a mountain canyon because of a diminution or cessation of sediment transport by the issuing stream. The deposits, which are generally fan-shaped in plan view, …
Alluvial fan - Wikipedia
An alluvial fan is an accumulation of sediments that fans outwards from a concentrated source of sediments, such as a narrow canyon emerging from an escarpment. They are characteristic of mountainous terrain in arid to semiarid climates, but are also found in more humid environments subject to intense rainfall and in areas of modern glaciation.
Experimental alluvial fans: Advances in understanding of fan …
2015年9月1日 · Experimental models have been used in alluvial fan research for over 50 years, with experiments covering aspects of alluvial fan morphology and dynamics in areas such as flow process understanding, flood hazard simulation, sequence stratigraphy, and …
Alluvial Fan - National Geographic Society
2023年10月19日 · An alluvial fan is a triangle-shaped deposit of gravel, sand, and even smaller pieces of sediment, such as silt. This sediment is called alluvium . Alluvial fans are usually created as flowing water interacts with mountains , hills , or the steep walls of canyons .
EarthWord–Alluvial Fan | U.S. Geological Survey - USGS.gov
The EarthWord: Alluvial Fan. Definition: Remember earlier when we covered fluvial? This word’s closely related to it. An alluvial fan happens when a fast-moving mountain stream empties out onto a relatively flat plain. All of the sediment it was carrying falls out as the water slows down.
Alluvial Fan - an overview | ScienceDirect Topics
Alluvial fans occur where confined mountain streams open up into valleys or onto plains (Figure 3). They are widespread in dryland environments, but also occur in subtropical, temperate, and even arctic and subarctic zones (Oguchi et al., 2001; Harvey et al., 2005).
Processes and Forms of Alluvial Fans - SpringerLink
2021年5月4日 · Alluvial fans are a conspicuous conical landform commonly developed where a channel emerges from a mountainous catchment to an adjoining valley (Figs. 14.1 and 14.2). Although present in perhaps all global climates, fans in …
Geology and geomorphology of alluvial and fluvial fans: current ...
Alluvial fan systems have two modes of operation that influence the processes operating on the fan surface and its resultant morphology: aggradation, where sediment is deposited on the fan; and degradation, in which sediment is eroded from the fan surface and out of the fan system.
Alluvial Fan Processes and Forms - SpringerLink
This chapter attempts to (a) provide an up-to-date synthesis of the literature on alluvial fans in desert settings, and (b) introduce a framework for their understanding based on concepts that have emerged during the last 120 years of scientific research.
Experimental alluvial fan evolution: Channel dynamics, slope controls ...
2012年5月16日 · Here we describe the growth of a series of experimental alluvial fans composed of a noncohesive grain mixture bimodal in size and density. We impose conditions that simulate a gravel/sand fan prograding into a static basin with constant water and sediment influx, and the resulting fans display realistic channelization and avulsion dynamics.
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