Title: Land Use and Fisheries Report of the Pilot Study
Author: G McMellin
Author: D Walling
Author: D Nicholls
Author: Environment Agency
Document Type: Monograph
Annotation: Environment Agency Project ID:EAPRJOUT_1641, Representation ID: 567, Object ID: 2748
Abstract:
This project was initiated on recommendation of the report “sedimentation and salmonids in England and Wales”, which expressed concern that there was little quantitative data on the impact or extent of siltation in England and Wales. Collaborative work was undertaken between the Environment Agency and Exeter University to develop and test a method for assessing the quantity and source of fines accumulating in salmonid spawning gravels. The use of geographical information systems were also assessed as a possible tool for the investigation of relationships between siltation and land-use practices. It was decided to use a retrievable sampling basket method to assess the quantity and source of fines accumulating within an area of cleaned gravel. The weight of fines was very variable within individual sites and between catchments. There was a significant difference between the weight of fines recovered from sites thought to be impacted and those thought to be clean. The source of the finest fraction (<0.125mm) was investigated using a simple fingerprinting approach based on a range of physical and chemical properties. This suggested that catchment sources were more important than channel bank sources in most cases. The results of this practical work were used to develop a standard methodology manual, which is enclosed as Appendix 1.
Publisher: Environment Agency
Subject Keywords: Spawning; Sediments; Trout; Salmon; Gravel; Redd; Silt; Land use; Rivers
Extent: 75
Permalink: http://www.environmentdata.org/archive/ealit:4809
Total file downloads: 228
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