Channel Properties Where Fluvial and Tidal Currents Meet

河道与潮汐流交汇处的河道特性

• 批准号: 1053299
• 负责人: Raymond Torres
• 金额: $ 33.6万
• 依托单位: University South Carolina Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-01 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1053299&HistoricalAwards=false
• 关键词: Channel; Properties; Where; Fluvial; Tidal

This project will investigate how energy in tides is consumed as they advance tens to hundreds of kilometers upstream of the river mouth, and cause river currents to reverse. This work is novel and scientifically important because it provides a hydrodynamic framework for linking two parts of the river continuum, fluvial and estuarine channels, which heretofore had been treated separately. We will measure channel dimensions, sediment properties, velocity profiles, and turbulent stresses in river flows, and model the changes in energy as tides advance upstream. In the section of the river where flows transition from solely downstream flow to becoming influenced by tides, we hypothesize that tidal energy dissipation processes lead to enhanced riverbed erosion, giving rise to a characteristic river form. Findings from this study will help shed light on: 1) how to manage dam water releases to minimize erosion downstream, 2) the development and stability of river bed habitats, and 3) sediment discharge to the coastal zone. Moreover, this work will help characterize the effects of sea level rise on rivers far inland.

该项目将研究潮汐在河口上游推进数十至数百公里时如何消耗能量，并导致河流逆流。 这项工作是新颖的，科学上的重要性，因为它提供了一个流体动力学框架，连接河流连续体的两个部分，河流和河口的渠道，这在此之前一直被单独处理。我们将测量河道尺寸、沉积物特性、流速剖面和河流中的湍流应力，并模拟潮汐向上游推进时的能量变化。 在部分河流的流量从单纯的下游流过渡到成为潮汐的影响，我们假设，潮汐能耗散过程导致增强河床侵蚀，从而产生一个特征的河流形式。 这项研究的结果将有助于阐明：1）如何管理大坝放水，以尽量减少下游的侵蚀，2）河床栖息地的发展和稳定，以及3）沉积物排放到沿海地区。 此外，这项工作将有助于描述海平面上升对内陆河流的影响。