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In geology and geomorphology a base level is the lower limit for an erosion process. [1] The modern term was introduced by John Wesley Powell in 1875. [ 1 ] The term was subsequently appropriated by William Morris Davis who used it in his cycle of erosion theory.
Geomorphology (from Ancient Greek ... In this way, rivers are thought of as setting the base level for large-scale landscape evolution in nonglacial environments.
A drop in base level causes a response by the river system to carve into the landscape. This incision begins at the formation of a knickpoint, and its upstream migration depends heavily upon the drainage area (and so the discharge of the river), material through which it cuts, and how large the drop in base level was. [7]
Terraced landscape, Goosenecks State Park, revealing the drop in river base level over time. In geomorphology a river is said to be rejuvenated when it is eroding the landscape in response to a lowering of its base level. The process is often a result of a sudden fall in sea level or the rise of land.
Oceanic plateau – Relatively flat submarine region that rises well above the level of the ambient seabed; Oceanic ridge – An underwater mountain system formed by plate tectonic spreading; Oceanic trench – Long and narrow depressions of the sea floor; Peninsula – Landform surrounded more than half but not entirely by water
The geographic cycle, or cycle of erosion, is an idealized model that explains the development of relief in landscapes. [1] The model starts with the erosion that follows uplift of land above a base level and ends, if conditions allow, in the formation of a peneplain. [1]
In geomorphology, drainage systems, ... The effect of integration of a drainage system is to replace local higher base levels with a single lower base level. [8]
Peneplanation was a cycle in which young landscapes are produced by uplift and denuded down to sea level, which is the base level. The process would be restarted when the old landscape was uplifted again or when the base level was lowered, producing a new, young landscape. [13]