The Three Dimensional Structure and Fate of a River Plume

0096551/O‘Donnell这个项目在自然界主要是观测，研究淡水河流羽流前沿边界上的速度场和密度场结构，以及在潮汐逆转期间羽流底部混合的测量。来自羽流边缘观测的数据将被用来检验从实验室结果推断的预测的有效性，并改进淡水羽流数值模式中横向混合的参数化。对羽状物底部混合的估计将来自对一个10万平方米盒子里的盐收支的研究，以及盒子里的微结构特征。这些估计将被用来检验这样的假设，即潮汐转向后不久，由于羽流底部强烈的垂直切变，小河流羽流在垂直方向上混合。

0096551/O'DonnellPrimarily observational in nature, this project is a study of the structure of the velocity and density fields along the frontal boundary of a freshwater river plume, together with measurements of mixing at the base of the plume during the reversal of the tide. The data from observations at the edge of the plume will be used to test the validity of predictions extrapolated from laboratory results, and to improve the parameterization of lateral mixing in a numerical model of a freshwater plume. Estimates of mixing across the base of the plume will be derived from a study of the salt budget in a 100,000 square meter box, together with microstructure profiles within the box. These estimates will be used to test the hypothesis that small river plumes are mixed away vertically, shortly after the turn of the tide, as a result of the build up of strong vertical shear at the base of the plume.