La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Transient, longitudinal, sedimentary furrows in the York River subestuary, Chesapeake Bay: Furrow evolution and effects on seabed mixing and sediment transport
Auteurs :	T. M. Dellapenna, Auteur ; S. A. Kuehl, Auteur ; L. Pitts, Auteur
Type de document :	Article
Dans :	Estuaries (24(2) APR 2001)
Article en page(s) :	215-227
Résumé :	Sedimentary furrows in fine-grained sediments have been observed in a variety of settings ranging from the deep ocean and deep lake bottoms to shallow estuaries and are commonly described as persistent, long-term features of the seabed. A series of 12 sidescan sonar surveys over the course of three years reveal that transient, longitudinal sedimentary furrows regularly form and then occasionally dissipate within the middle portion of the York River. Varying furrow morphologies were observed depending on current conditions, ranging from large regularly spaced (0.7-7 m) linear furrows during low current conditions to large patches of meandering furrows as the mean current increases or no bed forms during the higher current conditions. Based on (210)Pb and (137)Cs profiles of kasten cores, differences in physical mixing depths of similar to 25 cm between cores collected

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