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 ?
Niem proposes that paired Oregon Coast Range streams, consisting of 1 east-flowing stream and 1 west-flowing stream such as Luckiamute-Siletz and Yaquina-Mary, are severed antecedent streams and the result of uplift outpacing downcutting by the ancestral river.
This, combined with the sustained pattern of downcutting throughout the Great Plains since ~4.5 Ma, reflects a much stronger pattern of uplift since ~4.5 Ma than in the preceding ~27 to ~4.5 Ma.
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.
It could probably result by vertical water movement downcutting through the karstic limestone.
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.
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.
Generally their sharp bases indicate downcutting into clay- or silt-rich floodplain sediments (cf.