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Titre :
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River flood plains: some observations on their formation
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Auteurs :
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M. Wolman ;
L. Leopold ;
US GEOLOGICAL SURVEY
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Type de document :
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rapport
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Editeur :
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Washington [USA] : US Government Printing Office, 1957
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Collection :
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Geological survey professional paper 282-C
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Format :
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50 p.
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Note générale :
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Sigle : USGS
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Langues:
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= Anglais
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Catégories :
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HYDRAULIQUE
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Mots-clés:
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GEOMORPHOLOGIE
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HYDRAULIQUE FLUVIALE
;
COURS D'EAU
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CANAL
;
INONDATION
;
FORMATION DE CRUE
;
FREQUENCE
;
COURANT
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Résumé :
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On many small rivers and most great rivers, the flood plain consists of channel and overbank deposits. The proportion of the latter is generally veryu small. Frequency studies indicate that the flood-plain surface and the small amount of deposition observed in great floods support the conclusion that overbank deposition contributes only a minor part of the material constituting the flood plain. The relatively high velocities which can occur in overbank flows and the reduction in sediment concentration which often accompanies large floods may also help account for this. Although lateral migration of channels is important in controlling the elevation of the flood plain, rates of migration are extremely variable and alone cannot account for the uniform relation the flood-plain surface bears to the channel.
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