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Titolo:
GRAIN-SIZE ALONG 2 GRAVEL-BED RIVERS - STATISTICAL VARIATION, SPATIALPATTERN AND SEDIMENTARY LINKS
Autore:
RICE S; CHURCH M;
Indirizzi:
LOUGHBOROUGH UNIV TECHNOL,DEPT GEOG LOUGHBOROUGH LE11 3TU LEICS ENGLAND UNIV BRITISH COLUMBIA,DEPT GEOG VANCOUVER BC V6T 1Z2 CANADA
Titolo Testata:
Earth surface processes and landforms
fascicolo: 4, volume: 23, anno: 1998,
pagine: 345 - 363
SICI:
0197-9337(1998)23:4<345:GA2GR->2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUMERICAL-SIMULATION; SELECTIVE TRANSPORT; DOWNSTREAM CHANGES; BRITISH-COLUMBIA; FLUVIAL GRAVELS; VARIABILITY; VARIANCES; EQUALITY; ABRASION; STREAMS;
Keywords:
FLUVIAL SEDIMENTS; GRAIN-SIZE CHANGE; ANALYSIS OF VARIANCE; DOWNSTREAM FINING; LATERAL SEDIMENT SOURCE; SEDIMENTARY LINK; GRAVEL-BED RIVER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
69
Recensione:
Indirizzi per estratti:
Citazione:
S. Rice e M. Church, "GRAIN-SIZE ALONG 2 GRAVEL-BED RIVERS - STATISTICAL VARIATION, SPATIALPATTERN AND SEDIMENTARY LINKS", Earth surface processes and landforms, 23(4), 1998, pp. 345-363

Abstract

A new set of field data facilitates a detailed analysis of variationsin bed material grain size within two confluent gravel-bed rivers in northeastern British Columbia, Canada. A preliminary assessment of grain-size variability establishes a basis for examination of the spatialpattern of grain-size change. Standard ANOVA techniques are inappropriate because individual samples have unequal variances and are not normally distributed. Alternative tests for homoscedasticity and comparison of means are therefore utilized. Within-site, between-sample variability is not significant. The grain-size distributions that were obtained at individual sites are therefore representative of the depositional environments that were sampled. In both rivers mean grain size doesvary significantly between sites and there is therefore a basis for examining the data for spatial patterns such as downstream fining. Textural variations along the two rivers studied here are complex and shownegligible overall fining (in over 100km). This is the consequence ofa large number of tributary inputs and non-alluvial sediment sources which an the legacy of Late Pleistocene glaciation. The identificationof lateral sources like these is fundamental for understanding textural changes within rivers. The sedimentary link (a channel reach between significant lateral sediment inputs) provides a means of isolating fluvial maturation processes (abrasion and sorting) from contingent lateral inputs. Strong fining trends are apparent in most links and classification of grain-size measurements according to their location within particular links greatly improves the statistical explanation of textural variation. Identification of sedimentary links provides a means of applying models of fluvial fining processes, so isolation of link networks will aid the development of basin-scale models of textural variation. (C) 1998 John Wiley & Sons, Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/08/20 alle ore 21:44:47