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Modeling downstream fining in sand-bed rivers. II: Application

January 1, 2005

In this paper the model presented in the companion paper, Wright and Parker (2005) is applied to a generic river reach typical of a large, sand-bed river flowing into the ocean in order to investigate the mechanisms controlling longitudinal profile development and downstream fining. Three mechanisms which drive downstream fining are studied: a delta prograding into standing water, sea-level rise, and tectonic subsidence. Various rates of sea-level rise (typical of the late Holocene) and tectonic subsidence are modeled in order to quantify their effects on the degree of profile concavity and downstream fining. Also, several other physical mechanisms which may affect fining are studied, including the relative importance of the suspended versus bed load, the effect of the loss of sediment overbank, and the influence of the delta bottom slope. Finally, sensitivity analysis is used to show that the grain-size distribution at the interface between the active layer and substrate has a significant effect on downstream fining.

Citation Information

Publication Year 2005
Title Modeling downstream fining in sand-bed rivers. II: Application
DOI 10.1080/00221680509500382
Authors S. Wright, G. Parker
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Hydraulic Research
Series Number
Index ID 70027429
Record Source USGS Publications Warehouse
USGS Organization