Employing the properties of the affine mappings, a very novel fractal model scheme based on the iterative function system is proposed. We obtain the vertical scaling factors by a set of the middle points in each affin...Employing the properties of the affine mappings, a very novel fractal model scheme based on the iterative function system is proposed. We obtain the vertical scaling factors by a set of the middle points in each affine transform, solving the difficulty in determining the vertical scaling factors, one of the most difficult challenges faced by the fractal interpolation. The proposed method is carried out by interpolating the known attractor and the real discrete sequences from seismic data. The results show that a great accuracy in reconstruction of the known attractor and seismic profile is found, leading to a significant improvement over other fractal interpolation schemes.展开更多
为弥补渔场区次表层实时环境数据的不足,实验基于Argo剖面观测资料,采用梯度依赖最优插值方法,通过点对点的方式,反演了黑潮-亲潮交汇区柔鱼渔获点上温盐垂直结构,并利用理论检验、与实测数据对比等方法验证了反演结果的可靠性。结果显...为弥补渔场区次表层实时环境数据的不足,实验基于Argo剖面观测资料,采用梯度依赖最优插值方法,通过点对点的方式,反演了黑潮-亲潮交汇区柔鱼渔获点上温盐垂直结构,并利用理论检验、与实测数据对比等方法验证了反演结果的可靠性。结果显示,反演剖面相对于Argo原始观测数据,最大温度均方根误差不超过1℃,最大盐度均方根误差不超过0.4;而其与“淞航”号现场观测的温度、盐度绝对偏差分别小于0.25℃和0.27。同时,通过反演剖面分析了渔场区的温盐垂直结构及其与柔鱼单位捕捞努力量渔获量(Catch per unit effort,CPUE)的关系,结果表明,2018年8月和10月柔鱼在5 m水层的适宜温度分别为16和14℃,50 m水层降低至9~12℃,各水层的温度与CPUE的统计关系均符合一定曲率下的指数函数分布,且渔获点存在明显跃层,跃层强度变化越大,CPUE随机性也越大,渔获点跃层强度在0.4℃/m左右时CPUE相对稳定。而无论是哪个月份,较大CPUE都位于相对低盐区,即柔鱼偏向于在低盐海域活动。本研究可为构建长时间序列、准实时的渔场环境数据提供新思路,进而为深入研究渔场变迁动力机制提供必要的数据支撑。展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos.60972004 and 60402004)
文摘Employing the properties of the affine mappings, a very novel fractal model scheme based on the iterative function system is proposed. We obtain the vertical scaling factors by a set of the middle points in each affine transform, solving the difficulty in determining the vertical scaling factors, one of the most difficult challenges faced by the fractal interpolation. The proposed method is carried out by interpolating the known attractor and the real discrete sequences from seismic data. The results show that a great accuracy in reconstruction of the known attractor and seismic profile is found, leading to a significant improvement over other fractal interpolation schemes.
文摘为弥补渔场区次表层实时环境数据的不足,实验基于Argo剖面观测资料,采用梯度依赖最优插值方法,通过点对点的方式,反演了黑潮-亲潮交汇区柔鱼渔获点上温盐垂直结构,并利用理论检验、与实测数据对比等方法验证了反演结果的可靠性。结果显示,反演剖面相对于Argo原始观测数据,最大温度均方根误差不超过1℃,最大盐度均方根误差不超过0.4;而其与“淞航”号现场观测的温度、盐度绝对偏差分别小于0.25℃和0.27。同时,通过反演剖面分析了渔场区的温盐垂直结构及其与柔鱼单位捕捞努力量渔获量(Catch per unit effort,CPUE)的关系,结果表明,2018年8月和10月柔鱼在5 m水层的适宜温度分别为16和14℃,50 m水层降低至9~12℃,各水层的温度与CPUE的统计关系均符合一定曲率下的指数函数分布,且渔获点存在明显跃层,跃层强度变化越大,CPUE随机性也越大,渔获点跃层强度在0.4℃/m左右时CPUE相对稳定。而无论是哪个月份,较大CPUE都位于相对低盐区,即柔鱼偏向于在低盐海域活动。本研究可为构建长时间序列、准实时的渔场环境数据提供新思路,进而为深入研究渔场变迁动力机制提供必要的数据支撑。
