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Transport and Mixing at River Confluences

河流交汇处的运输和混合

基本信息

批准号：
255884283
负责人：
Dr. Alexander Sukhodolov, Ph.D.
金额：
--
依托单位：
Abteilung 1: Ökohydrologie und Biogeochemie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/255884283?language=en
关键词：
Transport Mixing River Confluences

项目摘要

River confluences - locations where rivers join one another - are fundamental components of natural drainage networks.Differences in the topography, geology, soils, and land use of watersheds within a drainage network produce differences in conservative properties of river flows and in the materials transported by these flows. These different flows and flow constituents are brought together at confluences, leading to river mixing.Although the fluvial dynamics of confluences have been studied intensively over the past several decades, the role that confluences play in mixing of conservative tracers, suspended sediment, and bed-material sediment has not been examined comprehensively and is still incompletely understood.The proposed research is motivated by this lack of understanding and aims to provide a transformational improvement in knowledge of lateral mixing at and immediately downstream of river confluences through a combination of field experiments designed to evaluate mixing under semi-controlled conditions,field investigations undertaken to assess mixing in the context of hydrological and morphological variability, and three-dimensional numerical modeling based on fundamental physical principles of flow and mass transport.The proposed studies will aim at the direct assessment of mixing and transport processes concomitantly with the controlling factorsin order to better understand the role of streamwise oriented vertical cells and turbulent coherent structures in those processes. The obtained data sets will facilitate development of quantitative theoretical models which will describe formation of those cells and their interactions with the large-scale riverbed morphology including the effect of bed discordance on the streamwise oriented vertical cells. The effects of riverbed roughness and spatial inhomogeneity in pressure distribution will be also explored by carrying out the quantitative assessment of experimental results on confluence dynamics with conventional hydrodynamic models with the outcome that mixing rates will be directly linked to the conventional hydrodynamics characteristics such as turbulent eddy viscosity and bulk flow parameters. The field studies of this research will be performed at the international field research station Tagliamento and on the confluences of rivers Ledra and Oder-Neisse, and Spree. Eddy resolving numerical simulations will expand a range and resolution of the experimental parametric space and will deliver a refined knowledge on the mixing and transport processes which will then be used to expand theory of fluvial processes. The results of the proposed research will have numerous practical outcomes because they will allow better prediction of transport and mixing of pollutants, sediments, and biological substances in fluvial systems.

河流交汇处是自然水系的基本组成部分，由于水系内流域的地形、地质、土壤和土地利用的差异，导致河流的保守性和河流输送的物质存在差异。这些不同的水流和水流成分在交汇处聚集在一起，导致河流混合。尽管过去几十年来人们对交汇处的河流动力学进行了深入研究，但交汇处在保守示踪剂、悬浮沉积物、床-物质沉积物还没有得到全面的研究，仍然不完全了解。拟议的研究是出于这种缺乏了解，旨在通过设计用于评估半控制条件下混合的现场实验，在水文和形态变化的背景下评估混合的现场调查，第三，三维数值模拟的基础上的基本物理原理的流动和质量传输。拟议的研究将旨在直接评估的混合和输运过程伴随着控制因素，以便更好地了解流向的垂直细胞和湍流相干结构在这些过程中的作用。所获得的数据集将有助于定量理论模型的发展，该模型将描述这些细胞的形成及其与大规模河床形态的相互作用，包括河床不一致性对流向定向的垂直细胞的影响。河床粗糙度和空间不均匀性对压力分布的影响也将通过对常规水动力学模型的汇流动力学实验结果进行定量评估来探索，其结果是混合率将直接与湍流涡动粘度和整体流动参数等常规水动力学特性相关联。这项研究的实地研究将在Taganento国际实地研究站以及莱德拉河、奥德河和施普雷河的汇合处进行。涡解数值模拟将扩大实验参数空间的范围和分辨率，并将提供一个完善的知识的混合和运输过程，然后将用于扩展理论的河流过程。拟议研究的结果将有许多实际成果，因为它们将允许更好地预测河流系统中污染物，沉积物和生物物质的运输和混合。

项目成果

期刊论文数量（11）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Field experiments on flow hydrodynamics at river confluences

河流交汇处水流动力学现场实验

DOI：
10.1201/9781315644479-265
发表时间：
2016
期刊：
影响因子：
0
作者：
Sukhodolov A.;T. Sukhodolova
通讯作者：
T. Sukhodolova

Effects of macrophyte development on the oxygen metabolism of an urban river rehabilitation structure.

DOI：
10.1016/j.scitotenv.2016.08.174
发表时间：
2017
期刊：
The Science of the total environment
影响因子：
0
作者：
T. Sukhodolova;A. Weber;Jingxin Zhang;C. Wolter
通讯作者：
T. Sukhodolova;A. Weber;Jingxin Zhang;C. Wolter

Turbulent flow structure at a discordant river confluence: Asymmetric jet dynamics with implications for channel morphology

DOI：
10.1002/2016jf004126
发表时间：
2017-06
期刊：
Journal of Geophysical Research: Earth Surface
影响因子：
0
作者：
A. Sukhodolov;J. Krick;T. Sukhodolova;Zhen Cheng;B. Rhoads;G. Constantinescu
通讯作者：
A. Sukhodolov;J. Krick;T. Sukhodolova;Zhen Cheng;B. Rhoads;G. Constantinescu

Effects of vegetation on turbulent flow structure in groyne fields