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Knickpoint
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In geomorphology, a knickpoint or nickpoint is part of a river or channel where there is a sharp change in channel bed slope, such as a waterfall or lake. Knickpoints reflect different conditions and
The Horseshoe Falls, one of the three Niagara Falls. The falls are a knickpoint, formed by slower erosion above the falls than below.
The Horseshoe Falls, one of the three Niagara Falls. The falls are a knickpoint, formed by slower erosion above the falls than below.
Bridalveil Fall, in Yosemite, flows over the edge of a glacially-carved hanging valley.
Bridalveil Fall, in Yosemite, flows over the edge of a glacially-carved hanging valley.
Dry Falls, Washington: a prehistoric knickpoint
Dry Falls, Washington: a prehistoric knickpoint
Fluvial terrace
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Fluvial terraces are elongated terraces that flank the sides of floodplains and fluvial valleys all over the world. They consist of a relatively level strip of land, called a "tread", separated from e
Knickpoint
…major waterfalls, knickpoints migrate upstream due to bedrock erosion leaving in their wake deep channels and abandoned floodplains, which then become terraces. Knickpoint retreat is easily demonstrated in some locations affected by postglacial isostatic response and relative sea-level drop such as in Scotland…
Hypothetical valley cross-section illustrating a complex sequence of aggradational (fill) and degradational (cut and strath) terraces. Note ct = cut t
Hypothetical valley cross-section illustrating a complex sequence of aggradational (fill) and degradational (cut and strath) terraces. Note ct = cut terrace, ft = fill terrace, ft(b) = buried fill terrace, fp = active floodplain, and st = strath terrace.
Eroded alluvial fill 60 feet (18 m) thick at Kanab Creek, Kane County, Utah. In 1884 the stream ran at top of the terrace. 1939 photo by United States
Eroded alluvial fill 60 feet (18 m) thick at Kanab Creek, Kane County, Utah. In 1884 the stream ran at top of the terrace. 1939 photo by United States Geological Survey.
Unpaired fluvial terraces on the South Fork of the Shoshone River, Park County, Wyoming, 1923. The river at left has encountered a formation of erosio
Unpaired fluvial terraces on the South Fork of the Shoshone River, Park County, Wyoming, 1923. The river at left has encountered a formation of erosion-resistant volcanic breccia, causing it to downcut more rapidly on the right, leaving terraces of different elevations.
The Rio Grande, flowing down through the Rio Grande Rift for the last several million years. The last stage of incision by the river is thought to be
The Rio Grande, flowing down through the Rio Grande Rift for the last several million years. The last stage of incision by the river is thought to be driven by the Milankovitch eccentricity cycle. Increased precipitation and sediment supply drove incision of the high standing terraces, beginning at ~800ka.