NESP Tropical Water Quality Hub - Managing Alluvial Gully Erosion
Jul 19, 2016
A new report on gully erosion and its impacts upon water quality in Australian marine environments has been released
The Tropical Water Quality Hub Project 1.7, led by Dr Andrew Brooks at Griffith University, has re-examined more than 5,000 hectares of alluvial gully survey data in the Normanby catchment from 2013 to establish erosion patterns. The report, which is now available online, show that complex management efforts will be needed to demonstrably reduce sediment run-off levels. Remediation efforts at just one part of the gully (such as building berms or fencing off cattle) can be negated by further erosion downstream, and Light Detection and Ranging (LiDAR) technology usually used to measure large-scale erosion can fail to detect fine-scale surface erosion that can contribute up to 70 per cent of total sediment load. Project 1.7’s results also show gully erosion may also be a far greater source of nutrient run-off into the Great Barrier Reef than first thought.
Final report can also be downloaded here