COLLABORATIVE RESEARCH: Avulsion, Anastomosis, and Floodplain Sedimentation in Meandering Fluvial Systems

合作研究：蜿蜒河流系统中的撕脱、吻合和漫滩沉积

• 批准号: 9304104
• 负责人: Norman Smith
• 金额: $ 10.52万
• 依托单位: University of Illinois at Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-08-01 至 1997-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9304104&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Avulsion; Anastomosis; Floodplain

9304104 Slingerland This study will investigate the processes of avulsion, i.e., the permanent diversion of flow away from an existing river channel, and the role of avulsion in the evolution of river floodplains and alluvial sedimentary deposits. The approach will be collaborative, focusing on mathematical modelling experiments, and modern and near-modern river floodplains. The project will attempt to address such questions as the causes of avulsion, the processes by which avulsions initiate and propagate through flood basins, the manner in which floodplains subsequently react to avulsion, and the effects of avulsion on the character of floodplain deposits. Because avulsion is an inevitable consequence of floodplain aggradation, it may play a vital, and heretofore underappreciated, role int he evolution of alluvial sedimentary sequences because it is likely to be a major process of deposition instead of merely a mechanism by which old channels are abandoned and new ones formed. When properly understood, avulsions may require modifications in the way we view the origin and role of meander belts, the relative importance of avulsive vs overbank flooding, and the manners in which floodplain deposits are generated. ***

小行星9304104 本研究将研究撕脱的过程，即， 水流从现有河道中永久性地改道，以及在河流漫滩和冲积沉积物的演变中撕离的作用。 该方法将是协作性的，重点是数学建模实验以及现代和近现代河流洪泛区。 该项目将试图解决诸如撕脱的原因、撕脱通过洪泛区开始和传播的过程、洪泛区随后对撕脱的反应方式以及撕脱对洪泛区沉积物性质的影响等问题。 由于撕脱是洪泛区加积的不可避免的后果，因此它可能在冲积沉积序列的演化中发挥着至关重要但迄今为止未被充分认识的作用，因为它可能是沉积的主要过程，而不仅仅是旧河道被废弃并形成新河道的机制。 当正确理解时，我们可能需要修改我们看待曲流带的起源和作用的方式，撕裂与漫滩洪水的相对重要性，以及洪泛平原沉积物的产生方式。 ***