Abstract

Channel geomorphology along the fluvial-tidal transition, Santee River, USA

Highlights

  • Along the river continuum, a single channel can transition from fluvial to tidal dominance in flow and sedimentary processes, and in benthic ecology (Dalrymple and Choi, 2007; Jablonski and Dalrymple, 2016)

  • Tidal forcing, and storm surge vary with time, the tidal effects on channel form vary along the channel (Wright et al, 1973; Dalrymple and Choi, 2007)

  • The concave-up curves with stage as the independent variable were well represented with a power function: A = aSb, where A = cross section area (m2), S = stage (m), a = 1, and b is the fitting parameter. This facet of the analysis provides a metric for comparing channel shapes via a “shape factor,” b

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Summary

Introduction

A single channel can transition from fluvial to tidal dominance in flow and sedimentary processes, and in benthic ecology (Dalrymple and Choi, 2007; Jablonski and Dalrymple, 2016). Coastal plain rivers are especially susceptible to the effects of marine forcing due to their low elevations and low gradient, and they can be expected to have well-d­ eveloped transition channel reaches that link fluvial- and tidal-dominant conditions (Dalrymple and Choi, 2007). In this context, the fluvial-tidal transition is taken as the geomorphic transition associated with unidirectional to bidirectional dominant flows (after Yankovsky et al, 2012). The way in which these conditions translate to tideinfluenced channel geomorphology remains largely unexplored (Phillips and Slattery, 2007; Ensign et al, 2014)

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