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RISS 인기검색어
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- 저자 : 리나 파야리안티 (검색결과 3 건)
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A preliminary study on seabed classification using a scientific echosounder
리나 파야리안티,강명희 한국수산해양기술학회 2019 수산해양기술연구 Vol.55 No.1
Acoustics are increasingly regarded as a remote-sensing tool that provides the basis for classifying and mapping ocean resources including seabed classification. It has long been understood that details about the character of the seabed (roughness, sediment type, grain-size distribution, porosity, and material density) are embedded in the acoustical echoes from the seabed. This study developed a sophisticated yet easy-to-use technique to discriminate seabed characteristics using a split beam echosounder. Acoustic survey was conducted in Tongyeong waters, South Korea in June 2018, and the verification of acoustic seabed classification was made by the Van Veen grab sampler. The acoustic scattering signals extracted the seabed hardness and roughness components as well as various seabed features. The seabed features were selected using the principal component analysis, and the seabed classification was performed by the K-means clustering. As a result, three seabed types such as sand, mud, and shell were discriminated. This preliminary study presented feasible application of a sounder to classify the seabed substrates. It can be further developed for characterizing marine habitats on a variety of spatial scales and studying the ecological characteristic of fishes near the habitats.
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Acoustic Characteristic of Sailfin Sandfish (Arctoscopus japonicus) in Dokdo, Republic of Korea
강명희,리나 파야리안티,Sangchul Yoon,황보규 한국해양과학기술원 2020 Ocean science journal Vol.55 No.2
The aim of this study is to determine the acoustic characteristics of sailfin sandfish over a wide frequency range. The acoustic survey was conducted in February, May, and August 2015 off Dokdo, Republic of Korea using EK60 echosounder (18, 38, 70, 120, and 200 kHz) with the mid-water trawls. Target strength (TS) of sailfin sandfish as functions of frequency and tilt angle was modeled using the KRM (Kirchhoff-ray mode) backscatter model. The sailfin sandfish characteristics were examined by using the ΔMVBS (difference of mean volume backscattering strength) method and the net opening depth method, respectively. The acoustic signals were clearly concentrated at 20−100 m water depth. The MVBS tended to become lower as the frequency became higher. The MVBS of sailfin sandfish in the net opening depth was higher than that from the ΔMVBS method, yet both characteristics of frequency response were very similar. In comparison with the frequency response of the ΔMVBS method, that of the modeled TS was very similar in February and May. In particular, the sailfin sandfish were concentrated at 30−80 m depth and favored a temperature below 13°C. Lastly the greatest abundance of sailfin sandfish occurred in May. The highest distribution of sailfin sandfish was in the eastern part of Dokdo in February, in the west, northeastern, and southeastern areas in May, and in southeastern region in August.
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A preparatory study on fish behavioral properties in a set-net
강명희,Jenming LIU,Raja Bidin bin Raja HASSAN,리나 파야리안티,황보규 한국수산해양기술학회 2020 수산해양기술연구 Vol.56 No.2
The fish influx and behavioral properties at a set-net off Goseong, South Korea were investigated using an imaging sonar. As a result, the average influx of fish was 33.9% at day time and 66.1% at night time, respectively, which indicated that a majority of fish entered into a playground in the set-net at night. The fish behavioral properties such as target (fish) length, range, orientation and major-axis angle were examined and compared among survey dates (4, 5, and 6 June 2019) using the statistical analysis tool (analysis of variance, ANOVA). The behavioral properties presented differently sometime of survey dates. This is preparatory study to support fish behavior properties in a set-net. It is expected that more elaborated behavioral information of fishes in the set-net is beneficial for designing and deploying a set-net fishing gear as well as general fish behavior research in the future.
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