著者
渡部 守義 新家 富雄 服部 真人
出版者
明石工業高等専門学校
雑誌
若手研究(B)
巻号頁・発行日
2008

テッポウエビは世界中の海域に普遍的に分布し、独特のパルス音を終始発する発音生物である。海域において、何らかの環境変化によりテッポウエビ類の生息数が変化した場合、水中録音によりその発音数の変化を調査するだけで、その影響を知ることができる。本研究では、テッポウエビの発音数を誰でも簡易に計測するため観測機器を開発した。
著者
新家 富雄
出版者
海洋音響学会
雑誌
海洋音響学会誌 (ISSN:09165835)
巻号頁・発行日
vol.31, no.4, pp.251-262, 2004-10
被引用文献数
1
著者
堤 千華 市川 光太郎 赤松 友成 荒井 修亮 新家 富雄 原 武史 カンジャナ アドゥンヤヌコソン
出版者
海洋理工学会
雑誌
Journal of Advanced Marine Science and Technology Society = 海洋理工学会誌 (ISSN:13412752)
巻号頁・発行日
vol.11, no.1, pp.77-80, 2005-10-30
参考文献数
6

Dugongs {Dugong dugon) are herbivorous marine mammals and endangered species. Unfortunately, the lack of basic research especially on use of seagrass patches by dugongs prevents us from taking any effective countermeasures for the conservation.In this study, to monitor feeding behavior of dugongs in the seagrass bed of a tidal flat, we propose a visual-acoustic combined observation method which is comprised of the visual observation and the acoustic observation using a digital camera and automatic underwater sound monitoring systems for dugong (AUSOMS-D). This new observation method was tested in Thai waters. The increase in the number of dugong feeding trails was observed during nighttime by the visual observation. Dugong calls and feeding sounds were recorded by the acoustic observation. The increase of the dugong feeding trails coincided with the feeding sounds. Therefore, the visual-acoustic combined observation method is effective in monitoring feeding behavior of dugongs. This method has technical benefits not to impact both on the dugongs and the seagrass beds.
著者
新家 富雄 江本 博俊 今津 安成 清水 浩 服部 真人
出版者
海洋理工学会
雑誌
Journal of Advanced Marine Science and Technology Society = 海洋理工学会誌 (ISSN:13412752)
巻号頁・発行日
vol.15, no.1, pp.47-54, 2009-11-07
参考文献数
10
被引用文献数
1

Passive acoustic biotelemetry for Dugong dugon enabled us to monitor the presence and the position of dugongs by receiving their calls using underwater sound techniques. The principle of the acoustic biotelemetry is to identify the sound source directions of their calls calculated from the time arrival differences between plural hydrophones. This method requires stereo automatic underwater sound monitoring systems. From 2003 to present, we have been developing the stereo underwater recording system. AUSOMS-D (Automatic Underwater Sound Monitoring System for Dugong). AUSOMS-D records underwater sound of frequency band between 20 Hz to 20 kHz by stereo (2ch) hydrophones at sampling frequency of 44.1 kHz with 16 bits resolution for many days. Progresses of AUSOMS-D have been made such as down sizing of the pressure resistant housing, longer recording time and additional scheduling functions. The latest AUSOMS-D is 7 kg in the air weight. It can record up to 15 days continuously with 16 alkaline D cells. AUSOMS-Dwas applied for the survey of dugong in Thailand's water many times.On the other hand, we have developed a stereo towed hydrophone system. The system is called "Towed Aquafeeler". Towed Aquafeeler can receive underwater sound of frequency band between 100 Hz to 20 kHz by 2ch. Recommended tow speed of the system in listing mode is 6 knots or less. Towed Aquafeeler is 11 kg in the air and neutral buoyancy in the water. It was also used for the dugong surveys in Thailand water twice.
著者
新家 富雄 鴨志田 隆 市川 光太郎 三田村 啓理 荒井 修亮
出版者
一般社団法人電子情報通信学会
雑誌
電子情報通信学会技術研究報告. US, 超音波 (ISSN:09135685)
巻号頁・発行日
vol.111, no.191, pp.11-16, 2011-08-23
被引用文献数
1

目視調査が難しい魚類の行動を知る手法として,魚に取り付けた超音波ピンガーが発信する信号からその存在や位置を求めるバイオテレメトリーがある.これまでのバイオテレメトリーシステムは異なる周波数のピンガーを連続的に追跡できなかった.本稿では複数台のステレオ式自動水中音録音装置(AUSOMS version 3.0)用いたバイオテレメトリーシステムを提案する.システムを構成するAUSOMS version 3.0は,超音波ピンガー信号の帯域(60〜84kHz)を低周波帯域(0〜24kHz)に変換し,14.4日間の連続録音ができる.2011年5月,広島県生野島において,提案するシステムを用いて10尾のアカメバルを同時に連続7日間,高精度にモニターすることに成功した.
著者
土屋 明 新家 富雄
出版者
Japan Society for Marine Surveys and Technology
雑誌
海洋調査技術 (ISSN:09152997)
巻号頁・発行日
vol.2, no.1, pp.1_45-1_54, 1990

On this paper, we describe the result in a basic study for a technical developing classification of coastal bottom material by using of acoustic reflection method. As the item of classification of bottom material, we selected, especially, such physical properties as grain size distribution and volume concentration (porosity) of particles in soft-mudsediment. Newly physical parameter <I>CPC</I> (cumulative weight percentage of particle volume concentration) is defined.<br> The other hand, we have derived a new conception of acoustic propagation, sound velocity and attenuation, for a model of N-phase suspension. In the conception, the volume ratio of N-phase particles classified by grain size in modefied suspension is particularly introduced.<br> The applicability of the conception for the soft-mud sediment was verified through both numerical simulations and laboratory experiments measuring physical properties, sound speed and attenuation at several frequencies.<br> A center frequency <I>f</I> of sound speed dispersion has a good response with the mediam grain size φ<SUB><I>m</I></SUB> (φ<SUB><I>m</I></SUB>=-log<SUB>2</SUB> 2 <I>a<SUB>m</SUB></I>; <I>a<SUB>m</SUB></I> is radius of particle in milli-meter) in the <I>CPC</I> curve. Then, the regressive formulation is<br> φ<SUB><I>m</I></SUB>=1.62 <I>F</I>+3.99±0.244<br> where <I>F</I>≡log<SUB>10</SUB> <I>f</I>; <I>f</I> in kHz.<br> A maximum V<SUB>m</SUB> of sound velocity at higher frequency range, eg. several hunderd kilo-hertz to several hundred mega-hertz, etc., is corresponding to the maximum of <I>CPC</I> curve at each volume concentration <I>C<SUB>p</SUB></I>. The theoretical formulation is<br> <I>C<SUB>p</SUB></I>=<I>CPC</I>={1.125 (<I>V<SUB>m</SUB></I>-1)}<SUP>1/2</SUP><br> where <I>V<SUB>m</SUB></I>=|<I>V<SUB>s</SUB></I>/<I>V<SUB>l</SUB></I>|<SUB>max</SUB>.<br> By using these formulas, φ<I><SUB>m</SUB></I> and <I>C<SUB>p</SUB></I> can be predicted from measured <I>F</I> and <I>V<SUB>m</SUB></I>.