Are restored side channels sustainable aquatic habitat features? Predicting the potential persistence of side channels as aquatic habitats based on their fine sedimentation dynamics

摘要: Abstract The restoration of side channels (also referred to as abandoned channels, former floodplain or arms) is increasingly implemented improve the ecological integrity river-floodplain systems. However, design channel projects remains poorly informed by theory empirical observations despite increasing number projects. Moreover, feedback regarding hydromorphological adjustment restored rarely documented, making it difficult predict persistence aquatic habitats. In this study, we analyze spatial and temporal patterns fine sediment deposition ( − 1 reached 90.3 cm·y locally. Some exhibited a significant decline sedimentation rates through time, whereas others maintained rather constant rates. Scouring processes (i.e., self-rejuvenation capacity) were occasionally documented in 15 channels. Six 16 studied appeared be self-sustaining. 10 accumulated more deposits after restoration. Parametric modeling suggested that among these four have long life-durations than century), three intermediate likely between nine decades), short two five decades). Observed channel-averaged can predicted from frequency magnitude maximum shear stress) upstream overflow events intensity backflow capacity). These predictors reflect dominant role geometry morphology alluvial plug, slope conditions) controlling their flooding regime. models applied successfully wide range morphologies used quantify priori effects sustainability