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Wave train model for knickpoint migration ArchiMer
Loget, Nicolas; Van Den Driessche, Jean.
Rivers respond to a drop in their base level by incising the topography. The upstream propagation of an incision, as usually depicted by a knickpoint migration, is thought to depend on several parameters such as the drainage area, lithology, and the amplitude of the base level drop. We first investigate the case of the Messinian Salinity Crisis that was characterized by the extreme base level fall (1500 m) of the Mediterranean Sea at the end of the Miocene. The response of drainage areas of three orders of magnitude (10(3) to 10(6) km(2)) highlights the dominant role of the drainage area (with a square root relationship) in controlling the knickpoint migration after a base level fall. A compilation of mean rates of knickpoint propagation for time durations...
Tipo: Text Palavras-chave: Knickpoint; Migration rate; Wave train; Messinian Salinity Crisis; Base level drop.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00000/11075/8056.pdf
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