On the Wave Bottom Shear Stress in Shallow Depths: The Role of Wave Period and Bed Roughness

Pascolo, Sara; Petti, Marco; Bosa, Silvia

doi:10.3390/w10101348

Cited by 21 publications

(27 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hydrodynamic model is based on classical 2DH shallow water equations, which include: turbulent fluxes treated according to the Smagorinsky approach as in the study of Pascolo et al [38], the forcings due to wind shear stress and radiation stress, and the mean bottom shear stress, which is influenced by both current and wave motion as pointed out by Soulsby [39,40]. The resulting differential equation system is integrated with a finite volume method which is able to represent phenomena such as the propagation of water front over a dry bed, which regularly occurs in lagoons and coastal environments at each tidal cycle, with the submergence and emergence of saltmarshes and beaches.…”

Section: Numerical Model and Computational Domainsmentioning

confidence: 99%

An Integrated Approach to Study the Morphodynamics of the Lignano Tidal Inlet

Petti

Bosa

Pascolo

et al. 2020

JMSE

Self Cite

View full text Add to dashboard Cite

The morphological evolution of a tidal inlet is the combined result of tides and wind waves, which interact in a non-linear manner and over very different time-scales. Likewise, the presence of maritime structures built in the vicinity of the tidal inlet, for coastal or port defense or to stabilize the inlet itself, can greatly affect this dynamic equilibrium, changing erosional and depositional patterns of the adjacent shoreline. In this study, the narrowing phenomenon of the Lignano tidal inlet subsequent to the construction of the related port, is examined through an integrated approach in order to propose and verify a possible form of evolution. This approach is the result of the combination of three methods: the historical reconstruction of the shifting of the coastline, an empirical scheme which describes the qualitative morphology of a mixed-energy tidal inlet, and a process-based morphodynamic modeling, which adopts a bi-dimensional depth averaged (2DH) approach. The application of numerical modeling has required the definition of a reduced input set of data representing an average year, in particular for wind and tidal conditions, including the meteorological component. The magnitude and the directions of the simulated dominant sediment transport are coherent with real processes both from a qualitative and a quantitative point of view.

show abstract

Section: Numerical Model and Computational Domainsmentioning

confidence: 99%

An Integrated Approach to Study the Morphodynamics of the Lignano Tidal Inlet

Petti

Bosa

Pascolo

et al. 2020

JMSE

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the presence of a more irregular bottom, characterized by bedforms (uneven granulometry with coexistence of sand and mud, and vegetation), the wave friction factor can considerably increase. This result was achieved by the authors in a previous study [45], performing a numerical generation process by means of the third generation spectral model SWAN [61], based on the complete wave action balance equation.…”

Section: Tidal Flat Morphodynamics: Some Preliminary Considerationsmentioning

confidence: 93%

“…The generation process of wind waves on shallow depths leads to quite different characteristics from offshore waves developed on deep waters, as the friction dissipation severely restricts the maximum value that wave heights and periods can reach [3,45]. This particular aspect has been verified both experimentally and numerically and it has led to a set of equations formulated for wave forecasting in shallow water [43,59].…”

Section: Tidal Flat Morphodynamics: Some Preliminary Considerationsmentioning

confidence: 99%

“…A recent line of research deals with the role played both by bottom friction and wave period on the wave bottom shear stress, which is fundamental in coastal morphodynamics [45,50]. It has been numerically shown that the bottom friction dissipation can severely limit the wave field with the consequence that the relative curve of bed shear stress loses the bell shape, tending instead to decrease monotonically with the water depth [45]. In this sense, the wave motion is able to induce sediment transport only when very strong winds are considered, which are however rare.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tidal Flats Morphodynamics: A new Conceptual Model to Predict Their Evolution over a Medium-Long Period

Petti

Pascolo

Bosa

et al. 2019

Water

Self Cite

View full text Add to dashboard Cite

The morphological evolution of tidal flats has been widely investigated in recent years as it represents a very important topic which is highly related to the climate-driven environmental changes. The period over which geomorphological changes can be noted is a multi-year up to pluri-decennial time scale, defined as medium-long period. This work presents a new conceptual model which is able to predict and estimate a limit depth between an erosion condition and a no-erosion condition for tidal flats. The domains of applicability are shallow and confined basins, where tidal flats are characterized by near-horizontal topography, as occurs inside lagoons. The theoretical approach provides a general equation which relates the limit depth of tidal flats to current velocity and critical erosion shear stress. The procedure, followed through to its development, takes into account the important role of the bottom friction dissipation in wind wave generation process for shallow water. The relationship between tidal flat depth, current velocity and critical shear stress is provided in three different configurations, depending on the direction of the wave motion compared to the current. The limit depth compared to the measured depth can suggest if tidal flats tend or not towards an erosion state over a medium-long period. In this sense, the conceptual model provides a relevant contribution to the comprehension of morphodynamics of these important environments. This approach has been validated with its application to a real context and the results are provided in the paper.

show abstract

“…Models enable complex underlying processes to be captured, and facilitate the analysis of interrelationships between variables in cases with limited data [2]. Modeling has major applications in fields such as hydrology, maritime and coastal studies [3,4], river hydraulics [5] and water quality [6].…”

Section: Introductionmentioning

confidence: 99%

River Model Calibration Based on Design of Experiments Theory. A Case Study: Meta River, Colombia

Acuña

Ávila

Canales

2019

Water

View full text Add to dashboard Cite

Numerical models are important tools for analyzing and solving water resources problems; however, a model’s reliability heavily depends on its calibration. This paper presents a method based on Design of Experiments theory for calibrating numerical models of rivers by considering the interaction between different calibration parameters, identifying the most sensitive parameters and finding a value or a range of values for which the calibration parameters produces an adequate performance of the model in terms of accuracy. The method consists of a systematic process for assessing the qualitative and quantitative performance of a hydromorphological numeric model. A 75 km reach of the Meta River, in Colombia, was used as case study for validating the method. The modeling was conducted by using the software package MIKE-21C, a two-dimensional flow model. The calibration is assessed by means of an Overall Weighted Indicator, based on the coefficient of determination of the calibration parameters and within a range from 0 to 1. For the case study, the most significant calibration parameters were the sediment transport equation, the riverbed load factor and the suspended load factor. The optimal calibration produced an Overall Weighted Indicator equal to 0.857. The method can be applied to any type of morphological models.

show abstract

On the Wave Bottom Shear Stress in Shallow Depths: The Role of Wave Period and Bed Roughness

Cited by 21 publications

References 52 publications

An Integrated Approach to Study the Morphodynamics of the Lignano Tidal Inlet

An Integrated Approach to Study the Morphodynamics of the Lignano Tidal Inlet

Tidal Flats Morphodynamics: A new Conceptual Model to Predict Their Evolution over a Medium-Long Period

River Model Calibration Based on Design of Experiments Theory. A Case Study: Meta River, Colombia

Contact Info

Product

Resources

About