The Three Dimensional Structure and Fate of a River Plume

0096551/O 'Donnell项目是一项观测性质的项目，研究淡水河羽流前沿边界沿着速度和密度场的结构，并测量潮汐逆转期间羽流底部的混合情况。 在羽流边缘的观测数据将用于测试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型中横向混合的参数化。 对羽流底部混合的估计将来自对100，000平方米盒子中的盐预算的研究，以及盒子内的微观结构剖面。 这些估计将被用来测试的假设，即小河羽流垂直混合了，在潮汐转向后不久，作为强大的垂直剪切在羽流的基础上建立的结果。

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.