A modeling and comparative study of bottom pressure signals generated by waves and ship in shallow water

Deng, Hui; Wang, Ke-bin; Yi, Wen-Bin; Wang, Chong

doi:10.1016/j.oceaneng.2022.112399

Cited by 1 publication

(3 citation statements)

References 10 publications

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“…37,38 The magnitude and duration of the signature are related to the hull shape, water depth and ship speed [39][40][41] and the signature becomes weaker with depth. 39 A study by Tafuni and Sahin 42 determined that the magnitude of the pressure signature scales quadratically with the vessel speed, while Deng et al 41 found that the low pressure region moves towards the stern of the ship with an increase in the vessel's speed. A typical pressure reduction generated by a passing ship is approximately 1000Pa, which is equivalent to a height change of 100mm of water, and is sustained for time period comparable to that taken by the vessel to transit through the area (typically > 10s).…”

Section: Pressure Signaturesmentioning

confidence: 99%

“…36 The pressure signature of a submerged object is qualitatively similar to that from a surface ship. 37,38 The magnitude and duration of the signature are related to the hull shape, water depth and ship speed [39][40][41] and the signature becomes weaker with depth. 39 A study by Tafuni and Sahin 42 determined that the magnitude of the pressure signature scales quadratically with the vessel speed, while Deng et al 41 found that the low pressure region moves towards the stern of the ship with an increase in the vessel's speed.…”

Section: Pressure Signaturesmentioning

confidence: 99%

“…43 A frequency spectrum analysis from Deng et al determined that the energy from the ship is concentrated at a lower frequency compared to the spectrum of waves from typical sea states. 41 This can be used to filter out background noise to acquire a pressure signal, however detection from afar remains difficult.…”

Section: Pressure Signaturesmentioning

confidence: 99%

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The non-acoustic signatures of underwater vehicles

Slimming,

Beniwal,

Devrelis

et al. 2023

Ocean Sensing and Monitoring XV

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Submersible vehicles, such as Uncrewed Underwater Vehicles (UUVs), can be lost underwater and it is desirable to locate them before they go missing or collide with other vehicles. These objects generate inherent signatures when they move in the ocean. With a better understanding of these signatures, more information regarding the motion of underwater vehicles can be inferred using LiDAR technology. In this paper, the authors review existing literature on various non-acoustic signatures of a submerged body, namely, the electromagnetic, biological and thermal signatures, turbulent wake patterns, internal waves and vortex structures. The authors discuss how these signatures evolve both spatially and temporally. Furthermore, the review investigates how environmental and operational parameters such as the stratification of the medium, vehicle speed, shape and depth affect the non-acoustic signatures. Underwater vehicles operating at low speeds and large depths have bioluminescent, Kelvin wake and Bernoulli hump signatures that are difficult to detect on the surface. Thermal signatures, vortex wakes and far wakes are only likely to be detected at the vehicle’s depth. This is primarily due to the ocean stratification which suppresses the vertical motion of underwater turbulent signatures. Thermal signatures appear to be most likely to be detected. The study concludes that relying on a single signature to detect submersibles is not advisable and future methods for underwater vehicle detection should use multiple sensors to detect complementary signatures.

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