downcutting


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downcutting

[′dau̇n‚kəd·iŋ]
(geology)
Stream erosion in which the cutting is directed in a downward direction.
References in periodicals archive ?
It is hypothesized that removal of these impoundments will decrease stream discharge and flooding risks downstream, resulting from improved channel carrying capacity, greater channel downcutting, less trapping of large woody debris (LWD) behind the structures, and less threat of a major structural failure.
A consequence of the increased downcutting of streams was incision, channel enlargement, and decreased overbank flooding events in low-order streams in the Southern Piedmont.
Philpott (95) and Kamphuis (60) have considered that downcutting of the platform surface immediately in front of the cliff must have occurred prior to the cliff recession: increasing water depth at the cliff base will reduce energy dissipation of waves arriving at the cliff base to further cliff erosion.
Despite these issues, The Myth of Indigenous Caribbean Extinction presents some important discussions regarding colonization strategies in the early Americas (and perhaps elsewhere), such as the invention of myths and other systematic strategies (primitivism, marginalization, and other downcutting mechanisms) used to obliterate the indigenous presence and thus to facilitate the seizure of lands.
Overflows of the Cache River in this broad, lowland area were probably more frequent before drainage accelerated channel erosion, evidenced by downcutting, and lowering of the level of the river.
The exposed glaciomarine sediments show relict deformation structures likely related to fluvial downcutting of exposed sediments shortly after a drop in sea-level that exposed the sediments.
Downcutting by upper Mud Brook is limited by a sandstone knickpoint near the intersection of State Route 8 and Graham Road in the southwestern part of the study area (Fig.
Generally their sharp bases indicate downcutting into clay- or silt-rich floodplain sediments (cf.
Steep downcutting and erosion of the rift flanks - first by rivers and then, about 34 million years ago, by the first glaciers of the East Antarctic Ice Sheet - further unloaded the crust, which buoyed the range higher, the authors suggested.
Urbanization lowers base flow, and creates downcutting due to lack of space to meander (Bernhardt and Palme, 2007).
The size and rates of erosional downcutting of individual straths differ from one structural unit to another irrespective of climatic or lithologic controls, implying neotectonic influences (Starkel, 1994; Schumm, 1986; Blum and Tornqvist, 2000; Brocard and van der Beek, 2006).