Response of a simple channel network to post-glacial sea level rise

J. W. Lauer, Gary Parker

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents a 1-dimensional numerical model for the morphodynamic evolution of the bed elevation along a simple river channel network consisting of a main stem and two tributaries. The purpose of the model is to represent the evolution of the sand-bed portion of the Fly/Strickland River System, Papua New Guinea, in response to sea level rise since the last glacial maximum. The model differs from most existing 1-D bed evolution models in that the channel cross-sectional geometry is allowed to vary over time in response to changes in sediment supply or bed elevation such that the Shields parameter at bankfull discharge is held constant. The model is driven by boundary conditions for sediment discharge at the upstream end of each tributary and by a water surface elevation boundary condition at the downstream end of the main stem. It predicts significant adjustment in the longitudinal profiles of both the larger and smaller tributaries (the Strickland and Middle Fly Rivers, respectively) as the downstream main stem (the Lower Fly River) aggrades in response to sea level rise.

Original languageEnglish (US)
Title of host publicationRiver, Coastal and Estuarine Morphodynamics
Subtitle of host publicationRCEM 2005 - Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics
Pages697-707
Number of pages11
StatePublished - Dec 1 2006
Event4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2005 - Urbana, IL, United States
Duration: Oct 4 2005Oct 7 2005

Publication series

NameRiver, Coastal and Estuarine Morphodynamics: RCEM 2005 - Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics
Volume2

Other

Other4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2005
CountryUnited States
CityUrbana, IL
Period10/4/0510/7/05

ASJC Scopus subject areas

  • Ecological Modeling
  • Environmental Chemistry

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