Fluvial Geomorphology Essay Example | Topics and Well Written Essays - 2000 words

Fluvial Geomorphology - Essay ExampleThe basic concepts in fluvial geomorphology be Equilibrium, Regime Theory and Channel Geometry, Geomorphic Thresholds and Scale. Equilibrium state is one in which the input of mass and heftiness to a specific scheme equals the outputs from the same system. In fluvial geomorphology it is this equilibrium state that the decant bring tend to achieveRegime theory is grounded on the propensity of a stream system to obtain an equilibrium state under constant environmental conditions. The Regime Theory has a mark of empirical equations relating channel shape to discharge, bank resistance and sediment load. It laid the foundation for a humongous body of work in Fluvial Geomorphology poring on the geometric properties of equilibrium alluvial channels and their adjustments to discharge and sediment transport regimes.Many of the concepts in fluvial geomorphology can be traced to European origins however, Classical American geomorphology as expressed b y W.M. Davis has its roots in the Surveys of the Western fall in States conducted by the U.S. Geological and Geographical Survey fol low-downing the Civil War. The leading figures in this stop consonant of exploration were John Wesley Powell, Gore Karl Gilbert, and Cl bence E. Dutton. Others of note during this time frame were Ferdinand V. Hayden, Lt. George N.Wheeler, and Archibald R. Marvine. As the west was being explored and the landforms analyzed, these individuals formulated some(prenominal) key ideas about geomorphology.Clarence Dutton made contributions by creating an awareness of isostatic adjustments and descriptions of landforms. lie also discussed the Great Denudation, a period of extensive erosion which he felt created the Colorado Plateau. His writings alsocontained several references to the idea of duplicate retreat of slopes. This concept is based upon a belief that hill positionings maintain their angle of slope and form as erosion occurs.The first fluvial geomo rphic model was the fluvial geographical cycle or the cycle of erosion, veritable by William Morris Davis between 1884 and 1899. The cycle was inspired by theories of evolution, and was depicted as a sequence by which a river would cut a valley more and more deeply, but then erosion of side valleys would eventually straight offten out the terrain again, now at a lower elevation. The cycle could be started over by uplift of the terrain. The model is today considered too much of a simplification to be curiously useful in practice.The Geographical Cycle, as envisioned by Davis, starts with the rapid uplifting of a theater and the beginning of fluvial erosion. Erosion of this initial stage soon produces the second stage, youth. This stage is characterized by low ease and poor drainage with road flat water divides. As the erosion process continues, relief increases until the mature stage is reached. At this time, narrow ridges form water divides and very little flat terrain remains . additive erosion leads to the old age stage in which relief in slight and low flat plains art dominant. The almost featureless plain resulting from the Geographical Cycle was termed a peneplain by Davis. Among suggested examples of peneplains are the Rocky Mountain Peneplain in the Colorado