GMS低分辨模拟云图与高分辨展宽数字云图之间的关系

文章介绍了低分辨的数字云图与原始的展宽云图数据的关系，从而直接从量化后低分辨云图上求取辐射物理量。     

渤海三维潮流数值模拟

本模型以具有自由面的三维非线性Ｎａｖｉｅｒ－Ｓｒｏｋｅｓ方程为基本方程，经σ坐标变换得到模式方程。基于过程分裂法，将三维流动中的快过程与慢过程劈开，并对每部分选用适合其物理特性和数值行为的计算格式，然后耦联求解。应用本模型详细计算了渤海的三维潮运动。其中，潮波系统模拟获得理想的结果；采用十层模式计算了Ｍ２潮流，以较高的辨率揭示了潮流的空间结构特征。最后本文给出了三维潮流预报的应用实例。     

Parabolic Wave Propagation Modelling in Orthogonal Coordinate Systems

This paper presents a numerical model study of the propagation of water waves using the parabolic approximation of the mild-slope equation in the orthogonal coordinate system. Two types of coordinate systems are studied: (a) a general form of orthogonal coordinate system and (b) the conformal system, a special form of orthogonal coordinate system. Two typical examples, namely, expanded breakwaters and a circular channel, are studied to validate the model. First, the examples are studied by use of the general orthogonal coordinates. Then the same examples are computed by use of the confonnal system. The computational results show that the confonnal coordinate system generally gives better predictions than the general orthogonal system. A numerical technique for generating the conformal grid is combined with the numerical model to improve the practicability of the model. The comparison between the result from the numerical grid system and that from the analytical grid system shows that reliable computational results can be obtained by use of the numerical confonnal grid system.     

3D Numerical Simulation of Overbank Flow in Non-Orthogonal Curvilinear Coordinates

1.Introduction Riverflowsinacompoundchannelofteninundatetheadjacentplainsathighdischarges.This generatesacomplicatedflowstructurebetweenthemainchannelflowandthefloodplainflow.In straightchannels,thevelocitydifferencebetweentheflowinthemainchannelandthatontheflood plainisoneofthemostdistinctivecharacteristics.Thisintroducesseveralphysicalandphenomenologi calfeaturesaroundthejunctionbetweenthemainchannelandthefloodplain,namely,theformation ofahighhorizontalshearlayerandstreamwiseandverticalvorti…     

晚中生代─新生代南海周缘地块运动与南海演化

报道了由华南几个盆地的古地磁数据综合而得的反映该区白垩纪以来古纬度变化曲线，结合Ｓｃｈｍｉｄｔｋｅ等（１９９０）发表的加里曼丹１５０Ｍａ以来的古地磁数据，表明华南与加里曼丹在４０Ｍａ前具有大致相同的古纬度变化史，差异仅出现在距今３０Ｍａ前后和１０Ｍａ以来。若此趋势可靠，则可作出下列推断：（１）南海的扩张只能发生在距今３０Ｍａ附近或１０Ｍａ以后华南与加里曼丹反向运动时期；距今３０Ｍａ的扩张已被广为接受；（２）华南与加里曼丹之向可能存在的古南海只能在９１Ｍａ之前存在；（３）南海演化可能存在两期扩张。南海的拟合可通过沿３５００ｍ等深线的先道时针旋转、后北向平移两个步骤完成。这与Ｈａｙａｓｈｉｄａ等（１９９１）提出的日本海张开与扩张模式很相似，提示东亚边缘海的形成和演化可能具有同样的机制。华南距今５０Ｍａ以来的古纬度变化与Ｔａｐｐｏｎｎｉｅｒ（１９８２）的传播挤出构造模式所预期的基本吻合，表明距今５０Ｍａ以来华南古纬度变化的运动学机制可用Ｔａｐｐｏｎｎｉｅｒ模式作解释。     

连云港南部近岸冲淤变化分析

选取连云港南部近岸带南北不同岸滩4个典型断面的样品点进行主成分分析，得出研究区控制泥沙交换和冲淤变化的主要动力因素为潮流作用和潮流波浪混合作用，据此，尝试建立冲淤变化的协方差数学模型，经过对计算结果显著性分析和实证检验得出研究区域的冲淤趋势为、整体冲淤平衡，局部略有冲刷”，从北到南，依次出现淤积平衡，冲淤平衡，冲刷平衡三种较为稳定的自然冲淤环境。     

北部湾三维潮流数值模拟

模型以经Sigma坐标变换后具有自由表面的三维非线性Navier-Stokes方程为基本方程,以分裂算子法剖分动量方程,用全隐差分格式求解连续方程得到自由表面,最后计算完整的速度场.此外,采用紊流封闭模型求解垂直方向紊动粘滞系数,准确获得了摩擦影响层的潮流结构.应用本模型计算了北部湾的潮波运动,重现了K₁、M₂分潮潮波系统并揭示了潮流的空间结构特征.