Earth Surface Processes and Landforms, Journal Year: 2025, Volume and Issue: 50(4)
Published: March 18, 2025
Abstract The term ‘legacy’ usually refers to past human activities that have long since ceased, but contemporary can potentially leave future legacies. While legacy sediment is often defined as having upstream anthropogenic origins, such from land clearing, infrastructure flood control structures and dams trap sediment, whether naturally or anthropogenically derived, persist for centuries more, thus leaving a of sedimentation. Dam removal becoming more common, accounting caused by the impoundment an important component planning its impacts. We provide four examples explore mechanisms generation: (1) use changes with no dams, (2) review non‐dam abstracts water substantially reduces transport, (3) case study longest‐duration geomorphic monitoring (2007 2023) short (<10 m) dam removed in 2008 (4) well‐studied tall (>10 removal. When are removed, fluvial processes typically erode directly adjacent newly formed opened stream channels over timescales, inaccessible deposits remain sediment. demonstrate overbank flooding sedimentation run‐of‐river create unrecognised outside modern reservoir pool. further outline how certain other characteristics, style character generate persistent sometimes landforms active where it unlikely be excavated natural except most extreme events. With increase building various parts world, ubiquitous, consequences river management.
Language: Английский