Effect of a porous sea-bed on water wave scattering by two thin vertical submerged porous plates

This article studies the impact of a submerged interface-piercing perforated barrier in a two-layer fluid flowing over a permeable bottom. We investigate oblique wave scattering, trapping and radiation due to the structure focusing on the bottom permeability. The dead water phenomenon is analysed with the consideration of the bottom permeability, which results in a higher variation of the interfacial wave due to the bottom permeability. The matched eigenfunction expansion method and the least square technique are used to calculate various hydrodynamic coefficients. Wave energy identity relation is derived for the scattering scenario, and the associated energy loss due to the barrier is calculated. In order to attain the maximum wave dissipation, an ideal porous-effect parameter of the barrier is proposed for consideration, and it is observed that larger values of porous-effect parameter result in the lowest feasible pressure distribution. A good comparison with a prior result justifies the current semi-analytical procedure. Furthermore, the verification of the energy-identity terms aid in the validation of the computed results. Additionally, wave trapping in a confined region is examined by investigating reflection coefficients by considering a rigid wall. The thin perforated barrier model is further considered for examining the radiation aspect while considering its slow motion. For various porous-effect parameters of the barrier, the amplitude ratio of the radiated potential is investigated, and it is clearly observed that higher frequency significantly lowers the amplitude for both free surface and interfacial propagating modes. The impact of the perforated barrier is analysed by investigating the essential hydrodynamic coefficients, namely, added mass and damping coefficient.

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“…Using relation (49) in equation ( 48) and equality condition of f R 1 and f R 2 (equation ( 7)), we get…”

Section: Mathematical Formulation and Methods Of Solutionmentioning

confidence: 99%

A mathematical study of water wave interaction with a thin perforated barrier in a two-layer fluid over a permeable bottom

Barman

Bora

2023

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…Fish can experience stress due to abrupt or drastic changes in water temperature, which can weaken their immune systems and general well-being. Finally, the timing and paths of migration can be impacted by changes in water temperature (Chanda and Bora, 2020), which may also have an effect on the availability of food and suitable habitats. Salinity also affects fish distribution.…”

Section: Introductionmentioning

confidence: 99%

Modeling of swordtip squid (Uroteuthis edulis) monthly habitat preference using remote sensing environmental data and climate indices

Haghi Vayghan,

Ray,

Mondal

et al. 2024

Front. Mar. Sci.

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Understanding the spatial arrangement of species in maritime settings necessitates the study of oceanography. Hence, doing a study on the correlation between oceanography and species dispersion is imperative, considering the impacts of global climate change. The study used a generalized additive modeling approach to analyze the influence of oceanographic conditions on the distribution of swordtip squid in northeastern Taiwan, integrating fishing data, climatic oscillation and oceanography. Among seven oceanographic characteristics, bottom sea temperature (SSTB), sea surface height (SSH), sea surface chlorophyll (SSC), and sea surface temperature (SST) showed significant influence in generalized additive model (GAM) analysis (combined deviance explained: 40.30%). The monthly catch rate of swordtip squid is influenced by six climatic oscillations, with the Pacific Decadal Oscillation having the most significant impact, accounting for 31% of the distribution, followed by the North Pacific Gyre Oscillation at 10.8% and the Western Pacific Oscillation at 6.05%. From 2015 to 2019, the main areas for squid fishing were situated in the northeastern waters of Taiwan, precisely within the geographical coordinates of 25°N to 28°N and 121.5°E to 125°E. This study provides crucial insights for managing swordtip squid fisheries in Taiwan's northwest waters, highlighting the importance of incorporating oceanographic conditions relating to climate change information into decision-making to protect global ocean fisheries and their dependent communities.

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“…Occurrences of Bragg resonance and cloaking of the multiple barriers were analyzed. Chanda and Nandan Bora (2020; carried out the analytical investigation on the surface and flexural gravity waves interaction with a pair of submerged vertical porous barriers above a porous seabed. Compared with that of water waves, the incorporation of the flexural gravitational waves leads to different hydrodynamic problems.…”

Section: Introductionmentioning

confidence: 99%

Wave scattering by a vertical cylinder with a submerged porous plate: Further analysis

Zhao

Geng

et al. 2022

Ocean Engineering

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Effect of a porous sea-bed on water wave scattering by two thin vertical submerged porous plates

Cited by 49 publications

References 31 publications

A mathematical study of water wave interaction with a thin perforated barrier in a two-layer fluid over a permeable bottom

A mathematical study of water wave interaction with a thin perforated barrier in a two-layer fluid over a permeable bottom

Modeling of swordtip squid (Uroteuthis edulis) monthly habitat preference using remote sensing environmental data and climate indices

Wave scattering by a vertical cylinder with a submerged porous plate: Further analysis

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