Journal cover Journal topic
Earth Surface Dynamics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 3.765 IF 3.765
  • IF 5-year value: 3.719 IF 5-year
    3.719
  • CiteScore value: 3.83 CiteScore
    3.83
  • SNIP value: 1.281 SNIP 1.281
  • IPP value: 3.61 IPP 3.61
  • SJR value: 1.527 SJR 1.527
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 17 Scimago H
    index 17
  • h5-index value: 18 h5-index 18
Volume 2, issue 1
Earth Surf. Dynam., 2, 105–116, 2014
https://doi.org/10.5194/esurf-2-105-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Frontiers in river, coastal and estuarine morphodynamics

Earth Surf. Dynam., 2, 105–116, 2014
https://doi.org/10.5194/esurf-2-105-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 11 Feb 2014

Research article | 11 Feb 2014

Analysis of the drainage density of experimental and modelled tidal networks

Z. Zhou1, L. Stefanon2, M. Olabarrieta3, A. D'Alpaos4, L. Carniello2, and G. Coco1 Z. Zhou et al.
  • 1Environmental Hydraulics Institute, "IH Cantabria", University of Cantabria, Santander, Spain
  • 2Department of Civil, Environmental and Architectural Engineering, University of Padova, Padova, Italy
  • 3Department of Civil and Coastal Engineering, University of Florida, Florida, USA
  • 4Department of Geosciences, University of Padova, Padova, Italy

Abstract. Based on controlled laboratory experiments, we numerically simulate the initiation and long-term evolution of back-barrier tidal networks in micro-tidal and meso-tidal conditions. The simulated pattern formation is comparable to the morphological growth observed in the laboratory, which is characterised by relatively rapid initiation and slower adjustment towards an equilibrium state. The simulated velocity field is in agreement with natural reference systems such as the micro-tidal Venice Lagoon and the meso-tidal Wadden Sea. Special attention is given to the concept of drainage density, which is measured on the basis of the exceedance probability distribution of the unchannelled flow lengths. Model results indicate that the exceedance probability distribution is characterised by an approximately exponential trend, similar to the results of laboratory experiments and observations in natural systems. The drainage density increases greatly during the initial phase of tidal network development, while it slows down when the system approaches equilibrium. Due to the larger tidal prism, the tidal basin has a larger drainage density for the meso-tidal condition (after the same amount of time) than the micro-tidal case. In both micro-tidal and meso-tidal simulations, it is found that there is an initial rapid increase of the tidal prism which soon reaches a relatively steady value (after approximately 40 yr), while the drainage density adjusts more slowly. In agreement with the laboratory experiments, the initial bottom perturbations play an important role in determining the morphological development and hence the exceedance probability distribution of the unchannelled flow lengths. Overall, our study indicates an agreement of the geometric characteristics between the numerical and experimental tidal networks.

Publications Copernicus
Download
Citation