Author ORCID Identifier

https://orcid.org/0000-0003-0523-508X

Year of Publication

2017

Degree Name

Master of Science in Civil Engineering (MSCE)

Document Type

Master's Thesis

College

Engineering

Department

Civil Engineering

First Advisor

Dr. James Fox

Abstract

The (dis)connectivity of sediment, defined as the detachment and transport of sediment from source to sink between geomorphic zones, is a major control on sediment transport rates but has seldom taken precedence in sediment transport models that focus on assessment of sediment impacts on water supply. A watershed-scale sediment transport model was formulated that incorporates sediment (dis)connectivity knowledge and subroutines and predicts sediment flux through coupling with an excessive shear stress erosion equation. The intersecting probabilities of sediment supply, detachment, transport, and (dis)connectivity produce the probability of sediment connectivity for a watershed or region of a watershed. The integration of the net watershed probability of sediment connectivity yields an estimate of the active watershed area in terms of sediment transport when multiplied times the entire watershed area. The sediment transport model was tested for a bedrock controlled catchment in the Southeastern United States for which extensive historic water and sediment flux data was available. It is expected that the model presented here can be used as a tool to assess the regional impacts of natural and anthropogenic sources of (dis)connectivity on sedimentation rates that lead to problems such as reservoir sedimentation and water quality degradation.

Digital Object Identifier (DOI)

https://doi.org/10.13023/ETD.2017.307

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