Promise, performance and current limitations of a magnetic Bedload Movement Detector

摘要: Understanding fluvial bedload transport and its geomorphic implications is hampered by the paucity low accuracy of field-derived data. Tunnicliffe et al. (Hydrological Processes, 2000; 14: 2631–2643) described Bedload Movement Detector (BMD), a magnetic induction system for measuring movement in gravel-bed rivers based on sensor that produces signals when field enhanced passing particle. We conducted two types laboratory experiments to attempt calibrate BMD system: (1) rotating platter were designed relate response curves particle properties, (2) flume measure speed permit computation calibrated model. Physically relations derived amongst volume, content, signal integral, amplitude width. The demonstrate basis estimate sediment flux rivers, but they require independent knowledge susceptibility. Over course number weaknesses design performance identified suggestions are made improve system. high spatial temporal resolution data sensors likely offer makes them valuable consider measurements both laboratory. Copyright © 2009 John Wiley & Sons, Ltd.