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Alluvial fans are the most important groundwater reservoirs in many regions. Many urban, industrial, and agricultural areas are located on alluvial fans, [50] including the conurbations of Los Angeles, California; Salt Lake City, Utah; and Denver, Colorado, in the western United States, and in many other parts of the world. [51]
Alluvial fan development is highly influenced by Tectonic uplift based on the rate of uplift through fan development. As shown in the figure, if tectonic uplift during deposition is greater than the flow of the stream depositing the sediment, then the alluvial fan's deposition will form closer to the mountain range in a more concentrated state ...
Straight-type channels can be found at alluvial fans. Braided rivers, which form in (tectonically active) areas that have a larger sedimentary load than the discharge of the river and a high gradient. Meandering rivers, which form a sinuous path in a usually low-gradient plain toward the end of a fluvial system.
In this arid environment, alluvial fans form at the mouth of these streams. Very large alluvial fans merged to form continuous alluvial slopes called bajadas along the Panamint Range. [33] The faster uplift along the Black Mountains formed much smaller alluvial fans because older fans are buried under playa sediments before they can grow too large.
They make up significant percentages of many alluvial fans and debris cones along steep mountain fronts. Fully exposed deposits commonly have lobate forms with boulder-rich snouts, and the lateral margins of debris-flow deposits and paths are commonly marked by the presence of boulder-rich lateral levees .
The sizable alluvial fan of Garmsar, near Tehran, Iran. Located at the foot of the Alburz mountains. The fairly large alluvial fan of Garmsar, east of Tehran, is fed by the Hableh Rud river with an important catchment area in the high Alburz mountain range. The river carries a large amount of water during the rainy season, otherwise the ...
Abyssal (or submarine) fans are formed from turbidity currents. These currents begin when a geologic activity pushes sediments over the edge of a continental shelf and down the continental slope, creating an underwater landslide. A dense slurry of muds and sands speeds towards the foot of the slope, until the current slows. The decreasing ...
Alluvial or sedimentary fans are shallow cone-shaped reliefs at the base of the continental slope that merge together, forming the continental rise. [2] Erosional submarine canyons slope downward and lead to alluvial fan valleys with increasing depth. [2] It is in this zone that sediment is deposited, forming the continental rise.