Quality assessment using River Habitat Survey data

摘要: 1. A representative sample of habitat features from rivers in the UK and Isle Man has been generated by River Habitat Survey (RHS) during 1994–1997. This baseline reference provides a sound basis for describing physical character assessing quality 500 m lengths river shown on 1:250 000 scale maps classified water purposes. 2. The use standard field method, with associated accreditation controls, stratified random sampling strategy computer database all provide robust foundation assessment. outputs have statistical satisfy practical needs management as well providing policy-makers relevant information. 3. Within UK, sites national, regional, or local importance wildlife can be determined, using criteria based presence known conservation interest. occurrence, individually, rare features, combinations also used to identify particular regional their quality. 4. assessment (HQA) scoring system, considered compare surveyed RHS method. However, meaningful results this comparison must involve same type. 5. For completeness, HQA scores given type calibrated top sites. individual sites, should conjunction measure artificial modification channel. simple Modification Score (HMS) system applied data purpose. 6. further developed define predict likely distribution which requirements certain aquatic riparian species. It better understanding spatial relationships between geomorphological processes type. © 1998 John Wiley & Sons, Ltd.