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首页> 外文期刊>CCAMLR science: journal of the Scientific Committee and the Commission for the Conservation of Antarctic Marine Living Resources >The error of the biomass estimate as a function of survey parameters and the statistics of a density field of krill aggregations
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The error of the biomass estimate as a function of survey parameters and the statistics of a density field of krill aggregations

机译：生物量估计值的误差作为调查参数和磷虾聚集体密度场的统计函数

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摘要

Simple relationships expressing the dependence of relative sampling error in a biomass estimate (from a survey) on the statistical characteristics of the fish concentration density field and on parameters of the survey itself, have been derived with the help of mathematical statistics and methods of calculus of probabilities. The biomass estimate is determined as the product of the average density for the region under examination and the area of this region. For a hydroacoustic survey, the anisotropy parameters correlation radius along transects and coefficient of variation serve as field characteristics on which the error depends. The direction of the survey with respect to the axis of the correlation ellipse and the frequency of transects (sections) serve as survey parameters. The relationships described here can be used in practice for both a posteriori estimation of the error made when calculating the biomass, and for survey planning on the basis of a priori estimates of the statistical characteristics of the concentration density field. These might provide a basis for the operative control of surveys.
机译：借助于数学统计和微积分方法，已经得出了简单的关系，表示生物量估计值（来自一项调查）中相对采样误差与鱼类浓度密度场的统计特征以及调查本身的参数之间的关系。概率。生物量估计值确定为所检查区域的平均密度与该区域的面积的乘积。对于水声勘测，各向异性参数沿样条线的相关半径和变化系数用作误差所依赖的场特征。相对于相关椭圆轴的测量方向和横断面（截面）的频率用作测量参数。在此描述的关系在实践中既可以用于计算生物量时所进行的误差的后验估计，也可以用于基于浓度密度场的统计特征的先验估计的调查计划。这些可能为调查的操作控制提供基础。

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