Collapse sinkholes are common in areas where gypsum strata underlie rock that is incompetent to bridge the cavities created by the groundwater dissolution of gypsum. On floodplains these can be obscured due to fill by overbank deposits, and channels tend to migrate towards larger enclosed depressions. This study utilises GIS to analyse the influence exerted by small collapse sinkholes on the channel dynamics of the alluvial River Ure, UK. At Ripon Loop, a large compound meander bend, sinkhole area and channel dynamics have been tracked over >160 years from multiple datasets, including historic maps, aerial imagery, lidar and a Structure-from-Motion photogrammetry dataset acquired for this study. This indicated two distinct populations, firstly long-lived, constant-sized sinkholes and secondly dynamically growing holes aligned with the contact of bedrock and unconsolidated materials of a buried valley at depth where artesian water saturated with sulphate enters the latter. Frequent overbank flows of the River Ure across the neck of the bend have interacted with sinkholes, e.g. by deposition of bedload in the down-valley end of the holes and localised headward incision on the opposite side due to the relatively high gradient between holes and the downstream limb. The location of holes has conditioned the incision of small shallow channels over at least seven years before cutoff occurred over several floods in 2019. Initially overbank flow traversed the neck via the chain of sinkholes before widening and deepening of the channel captured all the surface flow of the River Ure resulting in the mobilisation of more than 20,000 m³ of sediment. Allogenic influences on fluvial systems in relation to meander dynamics are often neglected and this study is the first to link floodplain sinkholes with detailed mechanisms of a chute cutoff, hereby indicating a potential feedback to sinkhole dissolution processes.

坍塌落水洞在石膏地层位于岩石之下的地区很常见，这些岩石无法弥合由石膏地下水溶解产生的空洞。在泛滥平原上，这些可能会因溢流沉积物而被掩盖，而河道往往会向更大的封闭洼地迁移。本研究利用 GIS 分析小型塌陷落水洞对英国乌尔河冲积河道动力学的影响。在 Ripon Loop，已从多个数据集（包括历史地图、航拍图像、激光雷达和为本研究获取的结构动态摄影测量数据集）跟踪了超过 160 年的大型复合曲流弯道、下沉洞区域和通道动态。这表明两个不同的种群，首先是长寿的，恒定大小的落水洞，其次是动态增长的洞，与基岩和埋藏山谷的松散材料的接触对齐，在深度处，硫酸盐饱和的自流水进入后者。乌尔河频繁的越岸流越过弯道颈部，与落水洞相互作用，例如，由于井眼和水槽之间的坡度相对较高，在井眼的下谷端沉积了底泥，并在对侧形成了局部的前向切口。下游肢体。在 2019 年几次洪水发生截断之前，至少 7 年的时间里，孔的位置已经调节了小型浅水通道的切口。³沉淀物。与曲流动力学相关的河流系统的同种异体影响经常被忽视，这项研究是第一个将漫滩落水洞与斜槽截止的详细机制联系起来的研究，从而表明对落水洞溶解过程的潜在反馈。