Suspended Sediment Transport in the Storglaciären Drainage Basin
作者:
SchneiderThomas,
BrongeChristian,
期刊:
Geografiska Annaler: Series A, Physical Geography
(Taylor Available online 1996)
卷期:
Volume 78,
issue 2-3
页码: 155-161
ISSN:0435-3676
年代: 1996
DOI:10.1080/04353676.1996.11880461
出版商: Taylor&Francis
数据来源: Taylor
摘要:
ABSTRACTThe mean annual suspended sediment load in the Storglaciären drainage basin is estimated to be 5.74×106kg yr-1. Assuming, that erosion and sedimentation in the proglacial area is in balance, the specific suspended sediment transport from Storglaciären amounts to 1.85×106kg km-2yr-1, which corresponds to an annual erosion of 0.7 mm. Adding estimated contributions by bedload, total annual erosion becomes 0.9-1.3 mm. The transport of suspended sediment in the proglacial stream is characterised by a time lag between peaks in suspended sediment concentration and peaks in water discharge and the flushing of material during flood events, followed by periods of low sediment transport. These patterns were found at diurnal, seasonal and annual time scales, A linear regression analysis of logarithmically transformed suspended sediment concentration and water discharge data yields good results, despite systematic underestimation of real suspended load. This underestimation most probably occurs because mobilisation of fine-grained material by rainstorms is ignored.
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