Quantification of bank erosion in a drained agricultural lowland catchment

摘要: The long-term and current volumes of sediment exported from stream banks were calculated as potential sources in a large pond located at the catchment outlet small agricultural lowland basin strongly affected by anthropogenic pressure France. Bank erosion was measured over short period using network pins along (1400 m long) to quantify material during single winter (2012–2013). this same last 69 years quantified an original approach involving comparison compilation three-dimensional historical redesign plans that date back 1944 with state 2013 (differential global positioning system LiDAR data). results suggest trend loss monitored pins, average rate 17.7 mm year−1 volume 75 t km−1. Over 69 years, 36 t km−1 year−1, throughout whole estimated be 14 t km−1 year−1. contribution bank filling 10 years is between 46% 52% based on extrapolation pin dynamics or 27% 30% data profile extrapolated for catchment. These represents major source degraded waters traditionally understudied catchments, where pressures are high.