Flow Dynamics over Estuarine Bedforms
河口床型的流动动力学
基本信息
- 批准号:504378711
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:
- 资助国家:德国
- 起止时间:
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
This project aims at characterising flow patterns over estuarine bedforms through flume experiments and numerical simulations. Bedforms (ripples and dunes) are ubiquitous features in rivers, estuaries, coastal environments and deep seas. They reflect the strength and pathways of sediment transport, strongly influence the overlying flow and have a major socio-economic relevance, for example through the control of navigational depth. In many estuaries, large bedform fields develop due to the strong hydrodynamics and high availability of sandy sediment. Flow above these bedform fields differs fundamentally from flow above well-known angle-of-repose (30° slope) triangular bedforms which have been until now the focus of laboratory and numerical modelling studies. Estuarine bedforms are mainly low-angle dunes, with mean lee slopes of 5 to 20°. Flow properties over such gentle slopes are currently not precisely known. For example, the relation between lee side slope and the absence or presence of intermittent or permanent flow separation is still poorly understood. Furthermore, estuarine bedforms have a relatively flat trough and a steep slope close to the crest, whereas river dunes have a flat crest and a steep slope close to their trough. The effect of this difference in dune morphology on the flow is currently unknown. Besides, the relation between reversing tidal flow and natural bedform morphology, including three-dimensional variations, have not yet been studied in detail.The proposed study will perform a series of experiments in a large flume facility in order to characterise flow properties (velocity and turbulence) above concrete bedforms resembling estuarine dunes. Three sets of bedform shapes will be modelled following bedform measurements from the Weser Estuary: steep asymmetric, low-angle asymmetric and symmetric dunes. Furthermore, high-resolution numerical simulations of flow above three-dimensional bedform fields will complement the flume experiments. The model simulations will allow to determine the patterns of tidal current velocities and turbulence above natural bedform fields from the Weser Estuary. The results of this project will allow a better understanding of the complex interaction between estuarine dunes and tidal flow, and enable a better parameterisation of small-scale processes into large scale hydro- and morphodynamic models.
该项目旨在通过水槽实验和数值模拟来描述河口河床上的水流模式。河床(波纹和沙丘)是河流、河口、海岸环境和深海中普遍存在的特征。它们反映了泥沙运输的强度和途径,强烈影响上覆水流,并具有重大的社会经济相关性,例如通过控制航行深度。在许多河口,由于强大的水动力和沙质沉积物的高可利用性,形成了大型的河床场。这些床形态场上方的流动与众所周知的休止角(30°坡度)三角形床形态上方的流动有着根本的不同,后者一直是实验室和数值模拟研究的重点。河口坡面以低角度沙丘为主,平均背风坡度为5 ~ 20°。这种缓坡上的流动特性目前还不清楚。例如,背风边坡与间歇或永久流动分离的存在或不存在之间的关系仍然知之甚少。此外,河口河床有一个相对平坦的槽和一个靠近波峰的陡坡,而河流沙丘有一个平坦的波峰和一个靠近波谷的陡坡。沙丘形态的这种差异对水流的影响目前尚不清楚。此外,潮汐逆流与自然河床形态(包括三维变化)之间的关系尚未得到详细研究。拟议的研究将在大型水槽设施中进行一系列实验,以表征类似河口沙丘的混凝土床上的流动特性(速度和湍流)。根据威悉河口的床型测量,将模拟三组床型:陡峭不对称、低角度不对称和对称沙丘。此外,三维流场的高分辨率数值模拟将补充水槽实验。模型模拟将允许确定潮汐流速度和湍流的模式,从威悉河口的自然河床场。该项目的结果将使人们更好地理解河口沙丘和潮汐流之间复杂的相互作用,并使小规模过程更好地参数化为大规模的水力和形态动力学模型。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
数据更新时间:{{ journalArticles.updateTime }}
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
Dr. Alice Lefebvre, Ph.D.其他文献
Dr. Alice Lefebvre, Ph.D.的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('Dr. Alice Lefebvre, Ph.D.', 18)}}的其他基金
Modelling flow over bedform fields in tidal environments
模拟潮汐环境中床型场的流动
- 批准号:
345915838 - 财政年份:2017
- 资助金额:
-- - 项目类别:
Research Grants
相似国自然基金
β-arrestin2- MFN2-Mitochondrial Dynamics轴调控星形胶质细胞功能对抑郁症进程的影响及机制研究
- 批准号:n/a
- 批准年份:2023
- 资助金额:0.0 万元
- 项目类别:省市级项目
相似海外基金
Structure and dynamics of the subcontinental lithospheric mantle over the Central and Eastern North American continent, constrained by numerical modeling based on tomography models
基于层析成像模型的数值模拟约束北美大陆中部和东部次大陆岩石圈地幔的结构和动力学
- 批准号:
2240943 - 财政年份:2023
- 资助金额:
-- - 项目类别:
Standard Grant
LTREB: Sexual selection over time: evolutionary dynamics and outcomes of intense male competition and female mate choice in a lek mating system
LTREB:随着时间的推移,性选择:lek交配系统中激烈的雄性竞争和雌性择偶的进化动态和结果
- 批准号:
2243423 - 财政年份:2023
- 资助金额:
-- - 项目类别:
Continuing Grant
Collaborative Research: Unraveling North American Ice-Sheet Dynamics and Regional Sea-Level Change along the U.S. Mid-Atlantic over the Last Glacial Cycle
合作研究:揭示末次冰期期间北美冰盖动力学和美国大西洋中部沿线区域海平面变化
- 批准号:
2244721 - 财政年份:2023
- 资助金额:
-- - 项目类别:
Standard Grant
Investigating the role of Polo-like kinase in regulating synaptonemal complex dynamics
研究 Polo 样激酶在调节联会复合体动力学中的作用
- 批准号:
10679711 - 财政年份:2023
- 资助金额:
-- - 项目类别:
Collaborative Research: Unraveling North American Ice-Sheet Dynamics and Regional Sea-Level Change along the U.S. Mid-Atlantic over the Last Glacial Cycle
合作研究:揭示末次冰期期间北美冰盖动力学和美国大西洋中部沿线区域海平面变化
- 批准号:
2244722 - 财政年份:2023
- 资助金额:
-- - 项目类别:
Standard Grant
SBIR Phase I: A Flexion-Based Computational Fluid Dynamics Tool for the Fast Computation of Turbulent Flow over Complex Geometries
SBIR 第一阶段:基于弯曲的计算流体动力学工具,用于快速计算复杂几何形状的湍流
- 批准号:
2133757 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Standard Grant
Changes in coastal oceanography over decades and longer: Combining dynamics and downscaling
几十年或更长时间沿海海洋学的变化:动态与降尺度相结合
- 批准号:
RGPIN-2022-03112 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Discovery Grants Program - Individual
Arithmetic Geometry and Dynamics over Finite Fields
有限域上的算术几何和动力学
- 批准号:
557298-2021 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Postdoctoral Fellowships
Neural Network Dynamics Over the Course of Aversive Conditioning: The Influence of Visuocortical and Attentional Network Activity in Predicting Extinction Learning
厌恶条件作用过程中的神经网络动力学:视觉皮层和注意网络活动对预测灭绝学习的影响
- 批准号:
10463102 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Studies on dynamics of lower tropospheric heat source over the Northeastern Indian subcontinent that drives the Asian summer monsoon onset
驱动亚洲夏季风爆发的印度次大陆东北部对流层低层热源动态研究
- 批准号:
22H01298 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Grant-in-Aid for Scientific Research (B)