Analytical and Numerical Propagation Loss Predictions for Gradually Range-Dependent Isospeed Waveguides

Sertlek, Hüseyin Özkan; Ainslie, Michael A.; Heaney, Kevin D.

doi:10.1109/joe.2018.2865640

Cited by 13 publications

(10 citation statements)

References 42 publications

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“…• Range-dependency can be covered within the all-fluid model approximation in the long-range module [163,164].…”

Section: Silence (Tud)mentioning

confidence: 99%

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Underwater Noise Emission Due to Offshore Pile Installation: A Review

Tsouvalas

2020

Energies

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The growing demand for renewable energy supply stimulates a drastic increase in the deployment rate of offshore wind energy. Offshore wind power generators are usually supported by large foundation piles that are driven into the seabed with hydraulic impact hammers or vibratory devices. The pile installation process, which is key to the construction of every new wind farm, is hindered by a serious by-product: the underwater noise pollution. This paper presents a comprehensive review of the state-of-the-art computational methods to predict the underwater noise emission by the installation of foundation piles offshore including the available noise mitigation strategies. Future challenges in the field are identified under the prism of the ever-increasing size of wind turbines and the emerging pile driving technologies.

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“…• Range-dependency can be covered within the all-fluid model approximation in the long-range module [163,164].…”

Section: Silence (Tud)mentioning

confidence: 99%

“…Is based on a novel efficient implementation of the hybrid propagation model 'Soprano' for range-dependent shallow waveguides developed by Sertlek et al[163]. It combines the accuracy of an incoherent adiabatic range-dependent normal mode model with the speed of Weston's flux integral approach.…”

mentioning

confidence: 99%

Underwater Noise Emission Due to Offshore Pile Installation: A Review

Tsouvalas

2020

Energies

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“…SOPRANO considers bathymetric variations and range-dependent sediment properties. The accuracy of SOPRANO was verified against a detailed multi-model comparison based on the propagation loss calculations of various methods (adiabatic mode theory, coupled modes, ray tracing, parabolic equation, and flux theory) [20] and compared with the measurements for shipping [33] and explosions [34]. These benchmark studies showed that the propagation loss (PL) for a variable sediment type and bathymetry is similar in accuracy to the adiabatic mode theory.…”

Section: Sound Propagation Modelingmentioning

confidence: 93%

“…For large-scale problems, the number of sources and receivers also plays a critical role in choosing a convenient model to find a balance between significant computational expenses and the accuracy. To overcome computational resource problems, a hybrid method based on normal mode and flux theories [20], called SOPRANO (Sound Propagation Algorithm for Noise Mapping), brings together the accuracy of the adiabatic range dependent normal mode and the speed of Weston's flux theories for shallow water propagation problems [32]. SOPRANO considers bathymetric variations and range-dependent sediment properties.…”

Section: Sound Propagation Modelingmentioning

confidence: 99%

“…The shipping densities are used as an input to calculate the average source level depending on the number of ships per unit area. Next, the sound propagation is modeled with the asymptotic approach of hybrid mode-flux theory, which has comparable accuracy to adiabatic mode theory (within 1-1.5 dB) without requiring long computational time [20]. The adiabatic mode theory is usually used for the slowly varying bathymetry and environmental parameters.…”

Section: Introductionmentioning

confidence: 99%

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Hindcasting Soundscapes before and during the COVID-19 Pandemic in Selected Areas of the North Sea and the Adriatic Sea

Sertlek

2021

JMSE

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The national measures in several European countries during the COVID-19 pandemic also affected offshore human activities, including shipping. In this work, the temporal and spatial variations of shipping sound are calculated for the years before and during the pandemic in selected shallow water test areas from the Southern North Sea and the Adriatic Sea. First, the monthly sound pressure level maps of ships and wind between 2017 and 2020 are calculated for frequencies between 100 Hz to 10 kHz. Next, the monthly changes in these maps are compared. The asymptotic approximation of the hybrid flux-mode propagation model reduces the computational requirements for sound mapping simulations and facilitates the production of a large number of sound maps for different months, depths, frequencies, and ship categories. After the strictest COVID-19 measures were applied in April 2020, the largest decline was observed for the fishing, passenger and recreational ships. Although the changes in the number of fishing vessels are large, their contribution to the soundscape is minor due to their low source level. In both test areas, the spatial exceedance levels and acoustic energies were decreased in 2020 compared to the average of the previous three years.

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