The Acoustic Characteristics of Deep Scattering Layer in I-Lan Bay by Using Fluid-Like Module

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Project title

Code/計畫編號

NSC100-2313-B019-010

Translated Name/計畫中文名

音響類流體模式應用於宜蘭灣海域深海散漫層行為之研究

Project Coordinator/計畫主持人

Ming-An Lee

Funding Organization/主管機關

National Science and Technology Center for Disaster Reduction

Department/Unit

Department of Environmental Biology and Fisheries Science

Website

https://www.grb.gov.tw/search/planDetail?id=2326034

Year

2011

Start date/計畫起

01-08-2011

Expected Completion/計畫迄

31-07-2012

Co-Investigator(s)

Ming-An Lee

Bugetid/研究經費

700千元

ResearchField/研究領域

海洋科學
漁業

宜蘭灣為我國傳統重要漁場之ㄧ。本海域在黑潮與陸棚水兩種不同性質水團之勢力消長及相互推移下﹐造成海洋環境之溫度､鹽度､營養鹽等生物地化通量的變化﹐這些特性可作為海洋生態動力特性與海洋理化通量資訊比對之訊息。又在海洋變動之同時﹐浮游動物生物量及分佈亦隨之有大中小尺度之時空間變動﹐申請者已初步證實東北部海域陸棚(200m)以深有明顯的深海散漫層存在，黑潮水域更存在2~3 層深海散漫層，這些深海散漫層均具有明顯日週迴游特性，不過其種類與日週迴游機制尚不清楚，因而如能配合現場 (水平分層) 採集之種類判識與量測調查，應是評估浮游動物生物量、分布及群集特性之最佳利器。本計畫擬以一年的時間搭乘海研二號於宜蘭灣海域以雙頻計測法(38-120, 120-200kHz)並利用多層式(5~6 層)生物採集網(含SSL 內之細微垂直分層採集)進行現場定點生物採集與CTD 等儀器觀測，解明宜蘭灣海域深海散漫層(deep scattering layer, DSL)日週迴游特性(Diel vertical movement, DVM)與音響生物體大小(Target strength)變動、時空分布及結構特性，及由現場量測之海洋理化特性、音響反射體大小資訊與統計分析，判析深海散漫層生物量、分布、群集與行為特性。 I-Lan Bay was one of the important fishing grounds in the Northeastern waters of Taiwan. As the shelf waters of East China Sea meet with the Kuroshio in this area, these changes of physical, chemical and biological oceanography could have profound impacts on the marine phenomena that are important to biology, ecology and dynamic carbon transformation here. In addition, the boundary of Kuroshio water may play an important role in primary production due to the shelf nutrient-rich water to this area, subsequently enhancing zooplankton production. Zooplankton are key component of pelagic food webs and its distribution are inherently complex, patchy at many scale, and influenced by physical process at many different scale from small turbulence scales to basin scales. Generally, the diel vertical movement (DVM) of zooplankton may be served as the key point of marine dynamics or grazing food chain. Studying and monitoring on the interaction of environmental factors and the DVM behavior of zooplankton (i.e. deep scattering layer, DSL) and species composition may provide data for the predicted ability of biological oceanography and carbon dynamic. The major purpose of this project are established in an investigative work based on biological and acoustic data aiming at the assessment of abundance and behavior of deep scattering layer associated with the environment in the I-lan Bay. The zooplankton acoustic characteristics was tried to evaluate by using fluid-like module. The acoustic surveys with the bi-frequency (38-120, 120-200kHz) fluid-like algorithm and CTD, multi-trawler device (MTD) at 5 to 6 layers per 4 to 6 hours were used to investigate the acoustic characteristics and species composition of zooplankton in the study area. The temporal and spatial variation of species composition and abundance of zooplankton associated with the larger acoustic target, temperature, salinity, current, chl-a concentration and moon phase and so on, will be also examined.

Keyword(s)

宜蘭灣
音響
日週迴游
I-Lan Bay
fishery acoustic
diel vertical movement

DSpace CRIS

The Acoustic Characteristics of Deep Scattering Layer in I-Lan Bay by Using Fluid-Like Module

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