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以2008年夏季在中国黄海中南部海域引起绿藻暴发的主要种类浒苔(Enteromorpha prolifera)为研究对象,在消声水池内利用经过校正的、工作频率为70kHz的Simrad EY500回声探测-积分系统对其声反射特征进行测定,根据浒苔的回声积分等测定值建立了浒苔声反射强度与浒苔密度关系的定量表达式。实验结果显示,浒苔是有效声散射体,其体积反向散射强度(Sν,dB)与浒苔密度(ρ,g/m3)之间的关系为Sν=17.31gρ-95.9,与鱼类目标强度和体长关系具有类似的表述模式。结果证实渔业声学原理和现行渔业声学仪器、方法同样适用浒苔的探测,水声技术可成为下沉浒苔快速监测的有效手段。实验同时显示,浒苔的声散射特征具有其特殊的复杂性,这可能与其可通过光合作用产生气体(氧气)有关。因此,若欲利用声学方法对下沉浒苔资源进行定量评估调查,需对浒苔的生理生化特征进行同步观测研究。
Taking the Enteromorpha prolifera, a major species causing green algae outbreak in the central and southern Yellow Sea in the summer of 2008, as a research object, a calibrated Simrad EY500 Echo-Echo-Integrating System The acoustic reflection characteristics were measured. According to the measurement of echo integral of Enteromorpha, the quantitative expression of the relationship between the sound reflection intensity of Enteromorpha and Enteromorpha was established. The experimental results show that Enteromorpha prolifera is an effective acoustic scatterer and the relationship between the volume backscattering intensity (Sν, dB) and the density of Enteromorpha (ρ, g / m3) is Sν = 17.31g ρ-95.9, The relationship between strength and body length has a similar pattern of expression. The results confirm that the principle of fishery acoustics and the current fishery acoustics instruments and methods are also applicable to the detection of Enteromorpha prolifera, and the underwater acoustic technique can be an effective means of rapid monitoring of the detached Enteromorpha prolifera. Experiments also show that the sound-scattering characteristics of Enteromorpha has its special complexity, which may be related to its production of gas (oxygen) by photosynthesis. Therefore, if we want to use acoustics method to quantitatively evaluate the sinking Enteromorpha resources, we need to observe the physiological and biochemical characteristics of Enteromorpha prolifera.