Arrival time determined by vertical array: Experimental results in shallow water

Gee‐Pinn J. Too; Chih‐Chung K. Wang; Chifang Chen; Jim Lynch; Arthur Newhall

doi:10.1121/1.4779925

Arrival time determined by vertical array: Experimental results in shallow water

The Journal of the Acoustical Society of America ◽

10.1121/1.4779925 ◽

2002 ◽

Vol 112 (5) ◽

pp. 2423-2423

Author(s):

Gee‐Pinn J. Too ◽

Chih‐Chung K. Wang ◽

Chifang Chen ◽

Jim Lynch ◽

Arthur Newhall

Keyword(s):

Shallow Water ◽

Arrival Time ◽

Experimental Results ◽

Vertical Array

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Adaptive Active Sonar Reception in Shallow Water Using Vertical Array Outputs Covariance Matrix Eigenvalues: Experimental Results

Adaptive Methods in Underwater Acoustics ◽

10.1007/978-94-009-5361-1_41 ◽

1985 ◽

pp. 461-467

Author(s):

J. P. Pignon ◽

J. J. Rihouey

Keyword(s):

Shallow Water ◽

Covariance Matrix ◽

Experimental Results ◽

Vertical Array ◽

Active Sonar ◽

Matrix Eigenvalues

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Experimental Study of a Tanker Ship Squat in Shallow Water

Jurnal Teknologi ◽

10.11113/jt.v66.2477 ◽

2014 ◽

Vol 66 (2) ◽

Author(s):

Mohammadreza Fathi Kazerooni ◽

Mohammad Saeed Seif

Keyword(s):

Experimental Study ◽

Shallow Water ◽

Experimental Approach ◽

Model Tests ◽

Ship Hull ◽

Experimental Results ◽

Shallow Waters ◽

Towing Tank ◽

Ship Model

One of the phenomena restricting the tanker navigation in shallow waters is reduction of under keel clearance in the terms of sinkage and dynamic trim that is called squatting. According to the complexity of flow around ship hull, one of the best methods to predict the ship squat is experimental approach based on model tests in the towing tank. In this study model tests for tanker ship model had been held in the towing tank and squat of the model are measured and analyzed. Based on experimental results suitable formulae for prediction of these types of ship squat in fairways are obtained.

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Estimating azimuth and slowness from three-component and array stations

Bulletin of the Seismological Society of America ◽

10.1785/bssa08006b1987 ◽

1990 ◽

Vol 80 (6B) ◽

pp. 1987-1998 ◽

Cited By ~ 4

Author(s):

Anne Suteau-Henson

Keyword(s):

Arrival Time ◽

Dominant Frequency ◽

Polarization Analysis ◽

Vertical Array ◽

Regional Network ◽

Array Measurements ◽

Short Period ◽

Wide Range ◽

P Type ◽

Teleseismic Events

Abstract The capabilities of three-component (3-C) and array stations for estimating azimuth and slowness are compared for short-period P-type phases recorded at the NORESS array. For vertical array data, azimuth and slowness estimates are obtained from broadband frequency-wavenumber (f-k) analysis. For 3-C data, polarization analysis is performed. The data processing is automated, using arrival time and dominant frequency information from the NORESS Bulletin. Independent determinations of azimuth and/or slowness, obtained from locations in the NEIS or regional network bulletins, are used as reference estimates. Over 100 events are analyzed, both teleseismic and regional. They were selected from a variety of distances and azimuths, and cover a wide range of signal-to-noise ratios (SNR). The capability of 3-C stations for azimuth and slowness estimation critically depends on SNR. For SNR below a threshold of ∼2, the scatter in the estimates is very large for both parameters, and the slowness of teleseismic events tends to be overestimated. Also, the results are site-dependent within the NORESS array. The array measurements obtained with the broadband f-k method are not significantly affected by noise at the levels of SNR considered. For events with sufficient SNR, both methods compare well, and only a slightly better performance is observed with the f-k method.

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