Collaborative Research: A field, laboratory and theoretical study of mixed bedrock-alluvial meandering rivers.

合作研究：混合基岩冲积曲流河的现场、实验室和理论研究。

• 批准号: 1124482
• 负责人: Gary Parker
• 金额: $ 24.45万
• 依托单位: University of Illinois at Urbana-Champaign
• 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: 2011-09-15 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1124482&HistoricalAwards=false
• 关键词: Collaborative; Research; field; laboratory; theoretical

The focus of this project is the meandering of river channels, an iconic phenomenon in geomorphology and a fundamental process of channel morphodynamics. The goal is to advance our understanding of meander morphodynamics in eroding channels enough to develop a general theoretical framework for channel meanders in a variety of environments. A particular focus is the meandering of mixed bedrock-alluvial channels and the role of sediment cover in the mediation of patterns of channel erosion. Such processes are being studied through a combination of field studies, laboratory experiments, numerical simulations and theoretical analysis. Novel aspects of the research include: (i) the study of micro-scale dissolutional meanders in the field and the laboratory as a proxy for macro-scale abrasional meanders, and (ii) the development of meander morphodynamic model whose channel cross-section is not fixed but rather evolves according to a plug-in constitutive equation for erosion rate.Meandering streams and rivers are a vital part of the natural landscape of the United States and beyond. Over the centuries, many of these rivers have been modified drastically and their crucial environmental role compromised. Remediation of these rivers has become a priority in recent years as the negative effects of such environmental damage have become clear. For remediation to succeed, and for the assessment and management of meandering rivers to be effective, a thorough understanding of channel morphodynamics is needed. The aim of this project is to deepen such understanding and to pass on these advances to the broad community of scientists and engineers interested in the topic.

该项目的重点是河道的蜿蜒曲折，这是地貌学上的标志性现象和通道形态动力学的基本过程。 目的是促进我们对曲折形态动力学的理解，足以在各种环境中为渠道蜿蜒的频道开发一般的理论框架。 一个特殊的重点是混合基岩 - 铝通道的曲折以及沉积物覆盖在通道侵蚀模式中的作用。 通过现场研究，实验室实验，数值模拟和理论分析的结合，正在研究此类过程。 该研究的新方面包括：（i）研究微观的溶解度在田间和实验室中作为宏观尺度磨损蜿蜒曲折的代表，以及（ii）蜿蜒的形态动力学模型的发展，其通道横截面的发展不是固定的，而不是根据插件的插入式范围的范围固定的，而自然的范围是自然的。及以后。 几个世纪以来，许多这些河流都经过了彻底的修改，其关键的环境角色受到了损害。 近年来，由于这种环境损害的负面影响已经很明显，因此对这些河流的修复已成为当务之急。 为了使修复成功，要评估和管理蜿蜒的河流有效，需要对渠道形态动力学有透彻的理解。 该项目的目的是加深这种理解，并将这些进步传达给对该主题感兴趣的广泛的科学家和工程师社区。