Application of chirp sonar reflection coefficient for sea floor sediment classification
Date Issued
2013
Date
2013
Author(s)
Jiang, Ding-Yuan
Abstract
The chirp sonar frequency-modulated (FM) systems offer deterministic, repeatable source-signatures for high-resolution normal incidence marine seismic reflection data that it provides quantitative, high resolution and low-noise sub-bottom data by correlated the output pulse and received signal. Many factors affect the transmission of sound waves in the water. Specifically, reflectivity is important for acoustic classification of seafloor sediment, the reflectivity will be affected by hydrological environment, sediment characteristics, topography, surface roughness. The chirp sonar was developed with the objective of remote acoustic classification of seafloor sediments with the stable and consistent signal transmitter.
Theoretically, chirp sonar record has a high signal to noise ratio and good penetration for seabed. Quantitative acoustic returns from the chirp sonar are used to estimate surficial acoustic impedance and to predict sediment properties by reflection coefficient (R). This study used core sample to account for the depositional environment. It represents the real sediment characteristics. The comparisons show a high correlation between the core-determined sediment properties and the estimates obtained from acoustic measurements.
According to the comparison between core and data of chirp sonar , we can understand the different acoustic characteristic of the sediment. For example the coarse sediments, it''s higher attenuation coefficients for the energy decay easily and show the worse penetration on the sub-bottom profile than fine sediment. This purpose of this research is to predict marine sediment classification by different sediment will produce different reflectivity using the reflection coefficient of chirp sonar.
Subjects
變頻聲納
反射係數
SDGs
Type
thesis
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