United Kingdom National State of the Art Report
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European Co-operation in the Field of Scientific and Technical Research &267 +DELWDW)UDJPHQWDWLRQGXHWR7UDQVSRUWDWLRQ ,QIUDVWUXFWXUH United Kingdom National State of the Art Report European Commission Directorate General Transport The Highways Agency (HA) is the primary author of this report, which forms the UK contribution to the COST 341 Action. Tony Sangwine, as head of the Horticulture and Nature Conservation team within the Traffic, Safety and Environment Division of the HA has overseen its production as Project Manager. The document reports the State of the Art in the UK regarding Habitat Fragmentation due to Transport Infrastructure. It has been compiled following consultation with a wide range of statutory and non-governmental organisations, and written by Claire Hicks (HA Environmental Advisor and COST 341 Project Officer). As an Executive agency of the Department of the Environment, Transport and the Regions (DETR), the HA is the UK lead participant in the COST 341 project, and is assisted by its research partner Penny Angold of the Department of Geography at The University of Birmingham. HA is responsible for the management, maintenance and improvement of the motorway and trunk road network in England. Accordingly, much of this report has been based upon the HAs specialist knowledge of the roads sector, and cites best practice and case studies predominantly relating to roads in England. However, during the research process, every effort has been made to obtain relevant information and examples from colleagues working in Scotland, Wales and Northern Ireland, and from the railway and inland waterway sectors. /HJDOQRWLFH Neither the European Commission nor any person acting on behalf of the Commission is responsible for the use which might be made of the following information. The views expressed in this publication do not necessarily reflect the views of the European Commission. A great deal of additional information on COST Transport is available on the World Wide Web. It can be accessed through the CORDIS server at the following address: http://www.cordis.lu/cost-transport/home.html Cataloguing data can be found at the end of this publication. Luxembourg: Office for Official Publications of the European Communities, 2000 ISBN xx-xxx-xxxx-x © European Communities 2000 Table of Contents 7DEOHRI&RQWHQWV Chapter 1. Introduction........................................................................................................ 7 Chapter 2. Key Ecological Concepts................................................................................... 8 Chapter 3. Effects of Infrastructure on Nature .................................................................... 9 Chapter 4. National context/European context ................................................................. 10 ,QWURGXFWLRQ %LRJHRJUDSKLFDOGHVFULSWLRQ 2YHUYLHZRIIUDJPHQWDWLRQ $GPLQLVWUDWLYHDQGOHJLVODWLYHIUDPHZRUN /DQGXVH SODQQLQJ LQ UHODWLRQ WR QDWXUH DQG ODQGVFDSH FRQVHUYDWLRQ DQG WUDQVSRUWLQIUDVWUXFWXUH 6XPPDU\ Chapter 5. Habitat Fragmentation due to Existing Transportation Infrastructure............. 37 ,QWURGXFWLRQ (XURSHDQWUDQVSRUWDWLRQQHWZRUNV 7UDQVSRUWDWLRQQHWZRUNV 5.3.1. Highways/motorways 41 5.3.2. Secondary road infrastructure 43 5.3.3. Railways 44 5.3.4. Waterways 47 (IIHFWVRIWKHH[LVWLQJWUDQVSRUWDWLRQQHWZRUNRQQDWXUH 5.4.1. Habitat loss 55 5.4.2. Corridor function 58 5.4.3. Disturbance 61 5.4.4. Fauna casualties 63 5.4.5. Barrier effect 67 5.4.6. Effects on populations 69 5.4.7. Overview of environmental bottlenecks 74 6HFRQGDU\HIIHFWVRIWUDQVSRUWLQIUDVWUXFWXUH 2QJRLQJUHVHDUFKDQGUHYLHZRIUHOHYDQWVWXGLHV 6XPPDU\ 3 Table of Contents Chapter 6. Traffic Safety in Relation to Fauna Casualties ................................................ 83 ,QWURGXFWLRQ *HQHUDOJXLGDQFHIRUUHGXFLQJGHHUURDGWUDIILFDFFLGHQWV Chapter 7. Avoidance, Mitigation, Compensation and Maintenance................................ 85 ,QWURGXFWLRQ $YRLGDQFHRIKDELWDWIUDJPHQWDWLRQ 2YHUYLHZRIPLWLJDWLRQPHDVXUHV 7.3.1. Fauna passages 107 2YHUYLHZRIFRPSHQVDWLRQPHDVXUHV 7.4.1. Habitat Creation 114 7.4.2. Habitat Translocation 115 7.4.3. Translocation of Protected Species 118 7.4.4. Habitat Enhancement 119 ([LVWLQJTXDOLW\VWDQGDUGVIRUPHDVXUHVMXVWLILFDWLRQPLQLPXPUHTXLUHPHQWV 7.5.1. Design Manual for Roads and Bridges 122 7.5.2. Standardising Design Measures 123 7.5.3. Technical Guidance 126 7.5.4. Government Guidance 127 0DLQWHQDQFHDVSHFWV 7.6.1. Verge management 132 7.6.2. Management of other surfaces 134 7.6.3. Coordinating land-use in adjacent areas 135 (YDOXDWLRQDQGPRQLWRULQJRIWKHHIIHFWLYLW\RIPHDVXUHV 7.7.1. Developing Best Practice 138 7.7.2. National Monitoring 140 6XPPDU\ Chapter 8. Habitat Fragmentation and Future Infrastructure Development.................... 143 ,QWURGXFWLRQ 3ROLFLHVDQGVWUDWHJLHVWUHQGV ,QGLFDWRUVLQGH[HVRIIUDJPHQWDWLRQ 0RGHOVWRSUHGLFWIUDJPHQWDWLRQE\QHZLQIUDVWUXFWXUHV 'DWDRQWUDQVSRUWDWLRQQHWZRUNVGHYHORSPHQW 2QJRLQJUHVHDUFKDQGUHYLHZRIUHOHYDQWVWXGLHV 4 Table of Contents 6XPPDU\ Chapter 9. Economic Aspects ......................................................................................... 179 ,QWURGXFWLRQ (QYLURQPHQWDO$FFRXQWLQJ 3ULRULWLVLQJ0LWLJDWLRQ Chapter 10.General Conclusions and Recommendations ................................................ 181 2YHUYLHZ %DVLF3ULQFLSOHVIRU%HWWHU0DQDJHPHQWRIWKH)UDJPHQDWLRQ(IIHFW 3RWHQWLDOIRU)XUWKHU,QYHVWLJDWLRQ Chapter 11.References...................................................................................................... 185 Annex I. Mapping......................................................................................................... 200 Annex II. Directory of Organisations and Competent Authorities ................................ 201 Annex III. Bibliography .................................................................................................. 202 Annex IV. Members of the COST 341 Management Committee ................................... 203 Annex V. COST 341 Memorandum of Understanding.................................................. 204 Annex VI. Technical Annex............................................................................................ 205 Annex VII. COST Transport Overview............................................................................ 211 5 Chapter 1 &KDSWHU ,QWURGXFWLRQ 7 Chapter 2 &KDSWHU .H\(FRORJLFDO&RQFHSWV 8 Chapter 3 &KDSWHU (IIHFWVRI,QIUDVWUXFWXUHRQ1DWXUH 9 Chapter 4 &KDSWHU 1DWLRQDOFRQWH[W(XURSHDQFRQWH[W ,1752'8&7,21 The United Kingdom (UK) of Great Britain and Northern Ireland covers an area of 244,100 km2 and consists of the four countries England, Scotland, Wales and Northern Ireland, each of which has a varying degree of autonomy. An island nation, the UK is situated in Northwest Europe, separated from the European Continent by the English Channel and the North Sea. The UK has a rolling landscape which is increasingly mountainous towards the north, with the Grampian Mountains in Scotland, Pennines in Northern England, and Cambrian Mountains in Wales (see Map 1: Topography (England and Wales) and Map 2: Topography (Northern Ireland)). The main natural inland waterways include the River Thames, Severn and Spey. Approximately 75% of the total UK land area is under agricultural uses, although the actual area fell by almost 300,000 hectares between 1985 and 1995. This decline has been mirrored by a similar increase in land used for non-arable purposes (see Map 3: Land Use (England and Wales) and Map 4: Land Use (Scotland)). 'HPRJUDSK\ Between 1971 and 1991 the UK population increased by 3% to 56.9 million (with increases of nearly 4% in England, 6% in Wales and 4% in Northern Ireland, and a decline in Scotland by 2%). By 1996 the estimated population of the UK was 58.8 million, accounting for 15.8%, or almost one sixth, of the population of the European Union. According to 1996 projections, the future trend is towards stabilised growth rates at around 0.22% per year, which equates to an increase by a further 5% between 1996 and 2031. Population is projected to increase in all the UK countries, except Scotland (Office for National Statistics, 1998). Despite the UK having one of the highest population densities in the world, its population is very unevenly distributed and only a quite small proportion of its land surface is heavily settled. Population density varies from over 3500 per km2 in London to less than 15 per km2 in the remotest parts of Scotland (see Map 5: Population Density (England and Wales), Map 6: Population Density (Scotland) and Map 7: Population Density (Northern Ireland)). This concentration of population in certain areas is a legacy of the industrial era and the associated rapid growth of large factory-based settlements, and of strict land-use planning policies designed to limit the outward spread of population from the largest built- up areas. Recent decades have seen some important changes in population distribution, reflecting changing residential preferences. The principal feature of regional population change has been the drift of population from North to South, and this has been accompanied by a shift from urban to rural regions. While the UK’s population is growing in overall size and continues to redistribute itself geographically, the most remarkable changes of the past few decades have been those relating to demographic structure. In particular, the population has been ageing, it has been 10 Chapter 4 getting more diverse in ethnic terms and it