期刊
WATER RESEARCH
卷 41, 期 5, 页码 1081-1093出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2006.11.010
关键词
effective particle size; flocculation; laser diffraction; LISST-100; particle size measurement; suspended sediment
资金
- Natural Environment Research Council [ceh010022] Funding Source: researchfish
This paper reports the use of a LISST-100 device to monitor the effective particle size characteristics of suspended sediment in situ, and at a quasi-continuous temporal resolution. The study site was located on the River Exe at Thorverton, Devon, UK. This device has not previously been utilized in studies of fluvial suspended sediment at the storm event scale, and existing studies of suspended sediment dynamics have not involved such a high temporal resolution for extended periods. An evaluation of the field performance of the instrument is presented, with respect to innovative data collection and analysis techniques. it was found that trends in the effective particle size distribution (EPSD) and degree of flocculation of suspended sediment at the study site were highly complex, and showed significant short-term variability that has not previously been documented in the fluvial environment. The collection of detailed records of EPSD facilitated interpretation of the dynamic evolution of the size characteristics of suspended sediment, in relation to its likely source and delivery and flocculation mechanisms. The influence of measurement frequency is considered in terms of its implications for future studies of the particle size of fluvial suspended sediment employing in situ data acquisition. (C) 2006 Elsevier Ltd. All rights reserved.
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