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

9304104 Slingerland 这项研究将调查撕脱过程，即水流从现有河道永久改道，以及撕脱在河流泛滥平原和冲积沉积物演化中的作用。 该方法将是协作性的，重点关注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、撕脱引发并通过洪泛区传播的过程、洪泛区随后对撕脱的反应方式以及撕脱对洪泛区沉积物特征的影响等问题。 由于撕脱是洪泛区加积的不可避免的结果，因此它可能在冲积沉积层序的演化中发挥着至关重要的、迄今为止未被充分认识的作用，因为它很可能是一个主要的沉积过程，而不仅仅是废弃旧河道和形成新河道的机制。 如果正确理解，撕脱可能需要改变我们看待曲流带的起源和作用、撕脱洪水与漫滩洪水的相对重要性以及洪泛区沉积物生成方式的方式。 ***

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. ***