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Titolo:
BED MATERIAL TEXTURE IN LOW-ORDER STREAMS ON THE QUEEN-CHARLOTTE-ISLANDS, BRITISH-COLUMBIA
Autore:
RICE S; CHURCH M;
Indirizzi:
UNIV BRITISH COLUMBIA,DEPT GEOG VANCOUVER BC V6T 1Z2 CANADA
Titolo Testata:
Earth surface processes and landforms
fascicolo: 1, volume: 21, anno: 1996,
pagine: 1 - 18
SICI:
0197-9337(1996)21:1<1:BMTILS>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOUNTAIN STREAM; WOODY DEBRIS; CHANNEL; GRAVEL; RIVER; MORPHOLOGY; OREGON; SYSTEM; CREEK; SIZE;
Keywords:
BED MATERIAL TEXTURE; LOW ORDER CHANNELS; HILLSLOPE-CHANNEL COUPLING; LARGE ORGANIC DEBRIS; STOCHASTIC VARIABILITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
54
Recensione:
Indirizzi per estratti:
Citazione:
S. Rice e M. Church, "BED MATERIAL TEXTURE IN LOW-ORDER STREAMS ON THE QUEEN-CHARLOTTE-ISLANDS, BRITISH-COLUMBIA", Earth surface processes and landforms, 21(1), 1996, pp. 1-18

Abstract

Low order channels comprise a large proportion of the links of every drainage basin, and are often at the centre of land management concerns. They exhibit hydrological and geomorphological characteristics atypical of higher order links. This paper examines the nature and causes of variations in the bed material texture of two streams on the Queen Charlotte Islands, British Columbia. The extant, functional exponential model is found to be inadequate for explaining observed changes in grain size parameters with distance downstream. Recurrent disruption ofsediment transport by large organic debris jams, and the sporadic contamination of the fluvial sediment population by colluvial inputs, preclude the development of longitudinal structure. Rather, grain size varies erratically over short distances. A stochastic model best describes the observed variations, and should be adopted as an alternative tothe exponential model in low order links. Characteristic variances are controlled by the degree of hillslope-channel coupling, and the extent and characteristics of non-alluvial storage mechanisms.

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Documento generato il 08/07/20 alle ore 07:24:32