VARIABLE CHARACTERISTICS OF SOUND SCATTERS IN SHALLOW TIDAL ESTUARY
VARIABLE CHARACTERISTICS OF SOUND SCATTERS IN SHALLOW TIDAL ESTUARY
复制标题
浅潮河口声散射的变化特征
DOI：
10.2208/prohe.45.1045
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
Hirofumi Mizuno
中科院分区：
文献类型：
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作者：
K. Kawanisi;Hirofumi Mizuno
利用NORTEK公司的1.5MHzADP下视声学多普勒海流剖面仪，在广岛湾观测了海底声散射的变化。2000年夏季，在广岛湾北部34·<$18 '37”N，132·<$23'57”E海域获得了几天的声波后向散射和三个速度分量的记录。在观测过程中，声背散射能量变化很大。水平流速的变化主要受半日潮的影响，而ABE的日变化则明显。由于ABE在夜间增加，ABE的日变化可能是由浮游动物引起的。但浮游动物的日垂直迁移尚不清楚。对ABE时间变化的分析也表明存在与潮流有关的半日变化。小潮期浮游动物丰度大于大潮期。
A downward-looking acoustic Doppler current profiler (NORTEK's 1.5MHz ADP), suspended by floats and connected to an oyster raft, has been used to observe the variability of sound scatters in Hiroshima Bay. Several-days records of acoustic backscatter and three components of velocity have been obtained in summer 2000 at 34•‹18'37" N, 132•‹23'57" E in the north area of Hiroshima Bay. The acoustic backscattered energies (ABEs) change greatly during the observations. While the variability of horizontal velocity is dominated by the semi-diurnal tide, diurnal variations of ABE are evidence. Since ABEs increase at night, the diurnal variability of ABEs is probably caused by zooplankton. However, the daily vertical zooplankton migration is not clear. Analysis of the temporal variations of ABE show also the existence of semi-diurnal variations that are associated with tidal current. The zooplankton abundance during the neap tide is larger than that during the spring tides.