Upper Mississippi River Flow and Sediment Characteristics and Their Effect on a Harbor Siltation Case

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1061/(ASCE)HY.1943-7900.0001507. This is version 1 of this Preprint.

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Authors

Roberto Fernández, Marcelo H Garcia , Gary Parker 

Abstract

Upper Mississippi River flow and sediment characteristics downstream of St. Louis are presented in this study. Available and measured data were used to assess a harbor siltation case and dredging needs. Such data are also useful to researchers and engineers conducting work in the Mississippi River and large rivers in general. Flows were characterized in terms of the mean annual hydrograph, flow duration curve, and mean annual, dominant, and effective discharges. Suspended and bed material sediments were characterized by grain-size distributions (GSDs). Suspended-sediment concentrations were characterized with a sediment rating curve, mean annual sediment graph, and duration curve. The results of the analyses were used to assess harbor sedimentation by comparing GSDs of harbor bed samples with those observed in the river. Bathymetric surveys were used to determine rates and occurrence of sedimentation. The analyses showed that harbor siltation correlates with river conditions and is driven by wash load in the river, which enters the harbor in suspension and deposits along the bottom due to the lack of flow-through velocities high enough to keep the fine sediments in suspension.

DOI

https://doi.org/10.31223/X5288T

Subjects

Civil and Environmental Engineering, Civil Engineering, Earth Sciences, Engineering, Geomorphology, Hydraulic Engineering, Physical Sciences and Mathematics, Sedimentology

Keywords

Upper Missipssippi, Wash Load, Harbor, Siltation, Dominant discharge, Effective Discharge

Dates

Published: 2021-01-29 03:06

Last Updated: 2021-01-29 06:06

License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None

Data Availability (Reason not available):
Data used is either included in the manuscript or publicly available via USGS

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