A Fluid Dynamics Laboratory in the Field: a study on shallow mixing layers at confluent and recirculating river flows under natural yet simplified conditions

河流中的湍流控制着复杂的混合和运输过程，这对河流系统的运作和可持续管理的许多方面至关重要，因此代表了准确定量评估的挑战。拟议的研究的目的是扩大对更高的雷诺数和现实的流动条件下的浅层剪切流的分析，并测试最近开发的模型作为预测计划的基础，方便计算的速度场，湍流特性，混合在河流汇流和工程建设。本研究是一个现场规模的物理模拟实验和测量研究的湍流与单探针和多探针技术扩展与粒子跟踪测速方法。现场规模的物理模拟意味着收敛流和丁坝的建设在一个直的浅河段的低地河流的简化允许控制实验条件。一些标准的计算流体动力学代码的数值模拟将提供如何制定这些复杂的流动的边界条件的理解。拟议的研究将汇集德国柏林IGB团队提供的现场方法专业知识和荷兰德尔夫特团队开发的实验室调查和数值模拟的先进方法。

Turbulent flows in rivers govern complex mixing and transport processes crucial for many aspects of functioning and sustainable management of fluvial systems, hence representing the challenge of accurate quantitative assessment. Proposed research is aimed to expand the analysis of shallow shear flows toward both higher Reynolds numbers and realistic flow conditions, and to test recently developed models as the basis for predictive schemes facilitating computations of velocity fields, characteristics of turbulence, and mixing at river confluences and engineering constructions. The research is designed as a field-scale physical modeling experiment and measurement study of turbulence with one- and multi-probe techniques expanded with methods of particle tracking velocimetry. Field-scale physical modeling implies the construction of converging flows and groynes in a straight shallow reach of a lowland river with simplifications allowing to control the experimental conditions. Numerical simulations with some standard computational fluid dynamics codes will provide understanding on how to formulate the boundary conditions for these complex flows. The proposed research will gather together the expertise in field methods provided by the German team of IGB, Berlin and the advanced methods of laboratory investigation and numerical simulations developed by the Dutch team of TU Delft.