Adaptation of genetic‐algorithm search for matched‐field inversion of ocean bottom compressional wave speed profiles

1994 ◽  
Vol 96 (5) ◽  
pp. 3234-3234
Author(s):  
Thomas J. Hayward ◽  
T. C. Yang
Keyword(s):  
Genetic Algorithm ◽  
Wave Speed ◽  
Compressional Wave ◽  
Ocean Bottom ◽  
Algorithm Search ◽  
Field Inversion

scholarly journals ABOUT ONE APPROACH TO AHP/ANP STABILITY MEASUREMENT

2011 ◽  
Vol 3 (1) ◽  
Author(s):  
Vitaliy V Tsyganok
Keyword(s):  
Genetic Algorithm ◽  
Measurement Methods ◽  
Search Procedure ◽  
Order Preservation ◽  
Expert Estimation ◽  
Pair Comparisons ◽  
Stability Order ◽  
Stability Measurement ◽  
Alternative Ranking ◽  
Algorithm Search

<p>AHP/ANP stability measurement methods are described. In this paper we define the method's stability as the measure of its results dependence on the expert's errors, made during pair comparisons. Ranking Stability (order preservation in alternative ranking under natural expert's errors, made during expert estimation) and Estimating Stability (maintaining alternative weights within the specified maximal relative inaccuracy range) are considered. Targeted Genetic Algorithm search procedure is used for possible stability violation detection. Then division-in-half (dichotomy) method is applied to calculate stability metric of a given criteria hierarchy.</p><p>http://dx.doi.org/10.13033/ijahp.v3i1.50</p>

scholarly journals Baroclinic Modes over Rough Bathymetry and the Surface Deformation Radius

2020 ◽  
Vol 50 (10) ◽  
pp. 2835-2847 ◽  
Author(s):  
J. H. LaCasce ◽  
Sjoerd Groeskamp
Keyword(s):  
Wave Speed ◽  
Surface Deformation ◽  
World Ocean ◽  
Surface Mode ◽  
Ocean Bottom ◽  
Baroclinic Mode ◽  
Flat Bottom ◽  
Two Layer Model ◽  
World Ocean Atlas ◽  
Baroclinic Modes

AbstractThe deformation radius is widely used as an indication of the eddy length scale at different latitudes. The radius is usually calculated assuming a flat ocean bottom. However, bathymetry alters the baroclinic modes and hence their deformation radii. In a linear quasigeostrophic two-layer model with realistic parameters, the deep flow for a 100-km wave approaches zero with a bottom ridge roughly 10 m high, leaving a baroclinic mode that is mostly surface trapped. This is in line with published current meter studies showing a primary EOF that is surface intensified and has nearly zero flow at the bottom. The deformation radius associated with this “surface mode” is significantly larger than that of the flat bottom baroclinic mode. Using World Ocean Atlas data, the surface radius is found to be 20%–50% larger over much of the globe, and 100% larger in some regions. This in turn alters the long Rossby wave speed, which is shown to be 1.5–2 times faster than over a flat bottom. In addition, the larger deformation radius is easier to resolve in ocean models.

Multi-Frequency Matched-Field Inversion of Benchmark Data Using a Genetic Algorithm

1998 ◽  
Vol 06 (01n02) ◽  
pp. 135-150 ◽  
Author(s):  
D. G. Simons ◽  
M. Snellen
Keyword(s):  
Genetic Algorithm ◽  
Test Cases ◽  
Data Sets ◽  
True Parameter ◽  
Benchmark Data ◽  
Line Array ◽  
Standard Normal ◽  
Water Test ◽  
Parameter Values ◽  
Field Inversion

For a selected number of shallow water test cases of the 1997 Geoacoustic Inversion Workshop we have applied Matched-Field Inversion to determine the geoacoustic and geometric (source location, water depth) parameters. A genetic algorithm has been applied for performing the optimization, whereas the replica fields have been calculated using a standard normal-mode model. The energy function to be optimized is based on the incoherent multi-frequency Bartlett processor. We have used the data sets provided at a few frequencies in the band 25–500 Hz for a vertical line array positioned at 5 km from the source. A comparison between the inverted and true parameter values is made.

scholarly journals A New Compressional Wave Speed Inversion Method Based on Granularity Parameters

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 185849-185856 ◽  
Author(s):  
Jingqiang Wang ◽  
Zhengyu Hou ◽  
Guanbao Li ◽  
Guangming Kan ◽  
Xiangmei Meng ◽  
...  
Keyword(s):  
Wave Speed ◽  
Compressional Wave ◽  
Inversion Method
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