Automatic non-destructive three-dimensional acoustic coring system for in situ detection of aquatic plant root under the water bottom

Mizuno, Katsunori; Liu, Xiaofei; Katase, Fuyuki; Asada, Akira; Murakoshi, Makoto; Yagita, Yasunobu; Fujimoto, Yasufumi; Shimada, Takehiko; Watanabe, Yoshiaki

doi:10.1016/j.csndt.2016.01.001

Cited by 10 publications

(10 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In principle, the detection of buried, cm-sized objects by high-frequency acoustic transducers in the upper decimeters of a sediment substrate is possible. Objects of previous investigations included, e.g., gas bubbles of up to 6 mm diameter down to 6 cm sediment depth targeted at 1.0-2.27 MHz [32], clams and artificial worm tubes targeted at 1.6 MHz along with 2D profiles with a horizontal resolution of 20 mm [33], clams buried in glass beads of different size investigating the effect of grain size on the signal at 1 MHz [34], lotus roots with a diameter of 2.5-3 cm at 100 kHz [35], including seasonal monitoring [36], the effect of artificial burrows and worm tubes on sound speed and attenuation at 100-400 kHz [37], artificial cylinders as a substitute for telecommunications cables targeted with a 75 kHz sweep at sample spacing of 2-5 cm [38], and trawl marks targeted with a parametric array of 40 transducers at 30-300 kHz [39]. If applied to biological and biogeochemical studies, these non-invasive methods minimize the risk of relocating endobenthic structures during measurement, prevent disturbance during transportation, and preserve unstable sediment surfaces.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Measurements to Image Endobenthos and Bioturbation with a High-Frequency 3D Seismic Lander

et al. 2021

View full text Add to dashboard Cite

The presented 3D seismic system operates three transducers (130 kHz) from a stationary lander and allows non-destructive imaging of small-scale objects within the top decimeters of silty sediments, covering a surface area of 0.2 m2. In laboratory experiments, samples such as shells, stones, and gummy worms of varied sizes (down to approx. 1 cm diameter) could be located in the 3D seismic cube to a depth of more than 20 cm and differentiated by a reflected amplitude intensity and spatial orientation. In addition, simulated bioturbation structures could be imaged. In a practical application, the system allows to determine the abundance of endobenthos and its dynamic in muddy deposits in-situ and thus identify the intensity of local bioturbation.

show abstract

Section: Introductionmentioning

confidence: 99%

Laboratory Measurements to Image Endobenthos and Bioturbation with a High-Frequency 3D Seismic Lander

et al. 2021

View full text Add to dashboard Cite

show abstract

“…14) Mizuno et al visualized aquatic plant roots in sediment as a three-dimensional acoustic image using a transducer that transmits pulses with a center frequency of 100 kHz. 15) In most cases, wavelengths are much longer than the grain sizes of sand or mud. However, in the case of the detection of small objects such as asari clams, it is necessary to use a transducer that has a millimeter-order resolution with high frequencies.…”

Section: Introductionmentioning

confidence: 99%

Application of wavelet shrinkage to acoustic imaging of buried asari clams using high-frequency ultrasound

Suganuma

Mizuno

Asada

2018

Jpn. J. Appl. Phys.

Self Cite

View full text Add to dashboard Cite

Acoustic imaging using high-frequency ultrasound can be an effective survey method to clarify the distribution of asari clams, which live in a relatively shallow layer of sediment. However, the propagation of ultrasound dramatically changes depending on grain size, resulting in visibility deterioration of acoustic images. In this study, the effects of grain size on the visibility of acoustic images were investigated by experiments using glass beads. Then, the effects were discussed using theoretical attenuation models (Biot–Stoll model and multiple scattering model developed by Schwartz and Plona [J. Appl. Phys. 55, 3971 (1984)]) and time–frequency analysis based on the continuous wavelet transform (CWT). In addition, wavelet shrinkage was applied to improve the visibility of acoustic images. The results suggest that multiple scattering and velocity dispersion strongly affected the sharpness and contrast of acoustic images depending on grain size. In addition, it was found that wavelet shrinkage was effective in reducing speckle noise and increasing the visibility of acoustic images of buried asari clams.

show abstract

“…Nonlinear acoustic systems, such as parametric subbottom profilers, which operate at a 50 kHz primary frequency and a 5-kHz secondary one, have been developed and used for the survey of buried deep-sea resources [3], [4]. Recently, relatively high-frequency signals of 100 kHz have been used for the precise survey of buried roots of a plant with outer diameters of 5-10 cm [5]. Even higher frequency signals with a center frequency of 1 MHz are just beginning to be used for the survey of small creatures, such as asari clam with a size of 3-5 cm [6].…”

mentioning

confidence: 99%

Numerical and Experimental Study of Wave Propagation in Water-Saturated Granular Media Using Effective Method Theories and a Full-Wave Numerical Simulation

Mizuno

Cristini

Komatitsch

et al. 2020

IEEE J. Oceanic Eng.

Self Cite

View full text Add to dashboard Cite

In this article, the detection of an object buried in marine sediments is investigated. Using the results from a series of experiments realized in a tank filled with water and calibrated glass beads, we evaluate the performances for a wide range of the value of the ratio kd of the grain size to the wavelength (k is the wave number and d is the grain diameter) of three types of prediction tools. The first two prediction tools are based on the definition of an equivalent model. The first tool is based on the well-known Biot-Stoll theory (BM model) while the second tool uses nonperiodic homogenization to define effective velocity and anisotropy maps representing the medium (HM model). The last prediction tool implements a timedomain full-wave numerical method, which takes into account each grain separately (GM model). It is shown that a good agreement between experiments and numerical simulations can be achieved using the BM model for the low kd regime and the HM model for high kd regime.

show abstract

Automatic non-destructive three-dimensional acoustic coring system for in situ detection of aquatic plant root under the water bottom

Cited by 10 publications

References 9 publications

Laboratory Measurements to Image Endobenthos and Bioturbation with a High-Frequency 3D Seismic Lander

Laboratory Measurements to Image Endobenthos and Bioturbation with a High-Frequency 3D Seismic Lander

Application of wavelet shrinkage to acoustic imaging of buried asari clams using high-frequency ultrasound

Numerical and Experimental Study of Wave Propagation in Water-Saturated Granular Media Using Effective Method Theories and a Full-Wave Numerical Simulation

Contact Info

Product

Resources

About