Use of Wavelet Techniques in the Study of Seawater Flux Dynamics in Coastal Lakes

Muchebve, Edwin; Nakamura, Yoshiyuki; Kamiya, Hiroshi

doi:10.5772/intechopen.75177

Cited by 4 publications

(4 citation statements)

References 20 publications

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“…A model study of the dynamics of water and salt exchange through cross-sections in Lakes Shinji and Nakaumi, Japan was done using the approach discussed here [7]. The hydrodynamic model in the STOC-LT (Ise Bay Simulator) was used [8].…”

Section: Discussionmentioning

confidence: 99%

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"Study of Water and Salt Exchange using Combined Simulation and Analytical Tools"

Muchebve

Nakamura

2018

EAES

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Section: Discussionmentioning

confidence: 99%

“…The equations originally derived by Hansen [2] are used in conducting the analysis of the processes governing the flux of materials along the longitudinal direction of an estuary or coastal lake [3]. Many studies have applied these equations to analyze of the longitudinal flux of materials [4][5][6][7].…”

Section: Salt Fluxes Across a Vertical Cross Sectionmentioning

confidence: 99%

"Study of Water and Salt Exchange using Combined Simulation and Analytical Tools"

Muchebve

Nakamura

2018

EAES

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“…Simlet wavelets were used. These wavelets belong to orthogonal wavelets with a compact carrier; they are close to symmetrical ones [36].…”

Section: Electroencephalogram Phase Portrait and Wavelet Analysismentioning

confidence: 99%

Analysis of Electroencephalograms Based on the Phase Plane Method

Kharchenko,

Kovacheva,

Andonov

2024

Applied Sciences

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Ensuring noise immunity is one of the main tasks of radio engineering and telecommunication. The main task of signal receiving comes down to the best recovery of useful information from a signal that is destructed during propagation and received together with interference. Currently, the interference and noise control comes to the fore. Modern elements and methods of processing, related to intelligent systems, strengthen the role of the verification and recognition of targets. This makes noise control particularly relevant. The most-important quantitative indicator that characterizes the quality of the useful signal is the signal-to-noise ratio. Therefore, determining the noise parameters is very important. In the present paper, a signal model is used in the form of an additive mixture of useful signals and Gaussian noise. It is an ordinary model of a received signal in radio engineering and communications. It is shown that the phase portrait of this signal has the shape of an ellipse at the low noise level. For the first time, an expression of the width of the ellipse line is obtained, which is determined by the noise dispersion. Currently, in electroencephalography, diagnosis is based on the Fourier transform. But, many brain diseases are not detected by this method. Therefore, the search and use of other methods of signal processing is relevant.

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“…and time (or location) (Grinsted et al, 2004a;Muchebve et al, 2018). The wavelet power spectrum can be interpreted as depicting the local variance of a time/space series.…”

Section: 𝜕 𝑧 ⁄mentioning

confidence: 99%

On the use of acoustic data to characterise the thermohaline stratification in a tropical ocean

Assunção

Lebourges‐Dhaussy

Silva³

et al. 2021

Preprint

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Abstract. The use of active acoustic to monitor abiotic structures and processes in the ocean have been gaining ground in oceanography. In some systems, acoustics allow the robust estimation of the depth of the pycnocline or thermocline either directly or indirectly when the physical structures drive the one of organisms. Here, we examined the feasibility of extracting the thermohaline structure (mixed-layer depth, upper and lower thermocline) from echosounder data collected in the oligotrophic Southwestern tropical Atlantic region at two seasons (spring and fall), more precisely in two areas with different thermohaline conditions, at both day and night. For that, we tested three approaches: (i) the vertical extension of the epipelagic community; (ii) the use of acoustic gradients; and (iii) a cross-wavelet approach. Results show that, even if the thermohaline structure impacts the vertical distribution of acoustic scatters, the resultant structuring did not allow for a robust estimation of the thermohaline limits indicating that other oceanographic or biological processes are acting. This result prevents for a fine-scale representation of the upper-layer turbulence from acoustic data. However, studying the proportion of acoustic biomass within each layer provides interesting insights on ecosystem structure in different thermohaline, seasonal and diel scenarios.

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Use of Wavelet Techniques in the Study of Seawater Flux Dynamics in Coastal Lakes

Cited by 4 publications

References 20 publications

"Study of Water and Salt Exchange using Combined Simulation and Analytical Tools"

"Study of Water and Salt Exchange using Combined Simulation and Analytical Tools"

Analysis of Electroencephalograms Based on the Phase Plane Method

On the use of acoustic data to characterise the thermohaline stratification in a tropical ocean

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