寒区结冰湖冰盖下溶解氧垂直分布数值模型

Numerical model for vertical distribution of dissolved oxygen in cold and icy lake ice

根据芬兰Valken-Kotinen湖2011年1—4月冰下溶解氧现场观测数据,经对这些数据进行统计分析,绘制出该湖冰下不同时刻溶解氧含量垂直分布图形,通过大量的数据拟合与优化辨识计算,得到了描述该结冰湖冰下溶解氧时空分布规律的一个新的正态分布数值模型。该数值模型中溶解氧含量的变化由深度和冰封持续时间来确定,与文献中的小波分析法和高斯拟合时间序列法的分析结果作比较,该数值模型计算出的冰下溶解氧含量值与实测值吻合效果更好,所绘制出的溶解氧含量曲面和等值线图形更光滑,最后讨论了进一步改进该模型需要考虑的一些因素。该研究结果可推广应用到其它寒区冰封湖泊或水产养殖池塘等水体环境的溶解氧问题研究中。

According to the observation data of dissolved oxygen（DO） during January to April of 2011 under ice of Valken-Kotinen Lake in Finnish,the vertical distribution patterns of DO are examined by analyzing these data.A new normal distribution model that can describe the spatial and temporal distribution of the DO is also given.The DO concentration in the numerical model is determined by the depth and the frozen duration of the lake.Compared with the results obtained by using wavelet analysis and Gaussian fitting time series methods,the DO concentration under ice attained by the proposed model is more agreed with the experimental data.The drawn surface and contour line of DO concentration are smoother.Finally,some considerations are discussed to improve the proposed model in future.This study can be applied to describe the dissolved oxygen of other cold regions such as icy lake,mariculture ponds,and so on.