Lagoon Sediment Dynamics: A Coupled Model to Study a Medium-Term Silting of Tidal Channels

Water

卷:10

Silvia Bosa¹  Sara Pascolo¹  Marco Petti¹ 

[1] Dipartimento Politecnico di Ingegneria e Architettura, University of Udine, 33100 Udine, Italy;

关键词: morphodynamic modelling;    tidal channels;    sediment transport;    wave-current interaction;    critical stress;    wind distribution;   

DOI  :  10.3390/w10050569

来源: DOAJ

【 摘 要 】

The silting of tidal channels is a natural process that affects several shallow lagoons and makes it difficult to navigate, requiring regular maintenance interventions. This phenomenon is the result of the complex non-linear interaction between tidal currents and wave motion. In this work, the morphodynamic evolution of the Marano and Grado lagoon is investigated by means of a two-dimensional horizontal (2DH) morphological-hydrodynamic and a spectral coupled model. An innovative procedure to reproduce the overall bathymetric changes in the medium term and, in particular, the volumes deposited inside channels, is presented. An average year with a sequence of winds and tides acting over that time was reconstructed, carrying out cross correlation techniques and spectral analyses of measured data. The predicted morphological evolution matches the annual dredged volumes in the lagoon critical branches and shows the distribution of erosion and deposition of cohesive sediments according to spatially variable values of critical shear stress.

【 授权许可】

Unknown