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The medial fan of a streamflow-dominated alluvial fan shows nearly the same depositional facies as ordinary fluvial environments, so that identification of ancient alluvial fans must be based on radial paleomorphology in a piedmont setting.
The Taoyuan Plateau is the ancient alluvial fan of the Dahan River, created by sediments eroded from the mountains. About 30,000 years ago, tectonic movement caused the Taipei Basin to drop in elevation, and the Tamsui River system captured the Dahan River and caused it to flow northeast.
The Waitangitāhuna river rises in the snowfields of the Tatare Range, on the slopes of McFetrick Peak, and flows in a generally northern direction. [4] A flood in March 1967 caused an avulsion of the river, with the river's flow being redirected across an ancient alluvial fan into Lake Wahapo, [5] 6 kilometres (3.7 mi) from its previous course. [6]
Alluvium (from Latin alluvius, from alluere 'to wash against') is loose clay, silt, sand, or gravel that has been deposited by running water in a stream bed, on a floodplain, in an alluvial fan or beach, or in similar settings. [1] [2] [3] Alluvium is also sometimes called alluvial deposit.
Several moderate-to-large-sized cities (Fontana, Rialto, Colton, and San Bernardino-the largest) are built on the ancient alluvial fan sediments left behind by Lytle Creek. [3] [4] Lytle Creek-- mouth of Lytle Creek Wash, head of artificial channels, confluence with the Santa Ana River; Cajon Wash. Cable Creek; Lone Pine Creek; Crowder Creek
The entire ancient town of Palermo in Sicily was equipped with a huge qanat system built during the Arab period (827–1072). [69] Many of the qanats are now mapped and some can be visited. The famous Scirocco room has an air-conditioning system cooled by the flow of water in a qanat and a "wind tower", a structure able to catch the wind and ...
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.
alluvial fan A fan-shaped deposit formed where a fast flowing stream flattens, slows, and spreads typically at the exit of a canyon onto a flatter plain. alluvium Soil or sediments deposited by a river or other running water. amber Fossilized resin or tree sap that is appreciated for its vivid colour, usually reddish-orange to gold or yellow ...