Equilibrium coastal profiles: I. Review and synthesis

Gao Shu; Michael Collins

doi:10.1007/BF02845175

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Equilibrium coastal profiles: I. Review and synthesis

Updated：2023-05-16

- Equilibrium coastal profiles: I. Review and synthesis
- Journal of Oceanology and Limnology Vol. 16, Issue 2, Pages: 97-107(1998)
- Affiliations：
  
  1. Institute of Oceanology
  2. Department of Oceanography The University
- Author bio：
- Funds：
- DOI：10.1007/BF02845175
  CLC：
- Published：1998
- Accepted：
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Shu, G., Collins, M. Equilibrium coastal profiles: I. Review and synthesis., Chin. J. Ocean. Limnol. 16, 97–107 (1998). https://doi.org/10.1007/BF02845175
DOI：

Shu, G., Collins, M. Equilibrium coastal profiles: I. Review and synthesis., Chin. J. Ocean. Limnol. 16, 97–107 (1998). https://doi.org/10.1007/BF02845175 DOI：

摘要

Abstract

Applicability of the coastal equilibrium concept depends upon proof of the existence of equilibrium. The present study demonstrates that

on the basis of the sediment continuity equation

three types of equilibrium are possible. Type I equilibrium requires that instantaneous sediment transport rates in both longshore and cross-shore directions are small

representing a final stage of erosion in response to natural processes. Type II equilibrium is reached if there are no variations in the net sediment transport rate in the longshore directions (i.e. zero cross-shore sediment transport). Such a situation occurs if the coastline is straight and there are no alongshore variations in hydrodynamic (i.e. wave and tidal) conditions. Type III equilibrium occurs when there are variations in longshore transport rates but the magnitude of instantaneous transport rate in the longshore direction is small compared with that in the cross-shore directions. In this case

the coastal profile is characterised by parallel advancement or retreat. Disequilibrium occurs if these conditions are not satisfied. Hence

prior to the selection of methods to determine the equilibrium coastal profile and the response time

the type of equilibrium must be identified.

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references

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