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Abiotic predictors of fine sediment accumulation in lowland rivers

International Journal of Sediment Research 2022年第1期37卷 128-137页

作者： Morwenn McKenzie judy england Ian D.L.Foster Martin A.Wilkes Geography and Environment Loughborough University Centre for Agroecology Water & Resilience Coventry University Research Environment Agency Howbery Park Environmental and Geographical Sciences University of Northampton Learning Hub University Drive Geography Department Rhodes University

The delivery of excessive fine sediment (particles<2 mm in diameter) to rivers can cause serious deleterious effects to aquatic ecosystems and is widely acknowledged to be one of the leading contributors to the degradation of rivers *** advances in using biological methods as a proxy,physical measures remain an important method through which fine sediment can be *** aim of this study was to provide further insights into the environmental variables controlling sediment accumulation in lowland gravel bed *** sampled 21 sites,during spring and autumn,selected to cover a gradient of excess fine *** sediment was sampled using a range of methods including visual assessments,the disturbance method,and suspended sediment concentrations.A range of abiotic predictors was measured during sampling,and hydrological and antecedent flow indices were derived from local flow gauging station *** results show reach scale visual estimates of fine sediment to be significantly and highly correlated with fully quantitative estimates of total surface *** regression analysis showed that flow variables (regime,antecedent,and local flow characteristics)were strong predictors of deposited sediment metrics but poor predictors of suspended *** content was shown to be relatively independent of total sediment quantity and is likely driven by other factors which influence the supply and breakdown of organic matter.

关键词： Deposited sediment Suspended sediment Visual assessments Disturbance Sediment sampling

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