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Uses and Applications

Uses and Applications. Marc Naura & Mark Diamond RHS Lead Region. River Habitat Survey. . . . Aims. A standard field methodology. objective. statistically robust. widely applicable. practicable: target time, 1 hour. A. A. B. B. Objective. ‘No perceptible flow’ in deeper pool.

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Uses and Applications

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  1. Uses and Applications Marc Naura & Mark Diamond RHS Lead Region

  2. River Habitat Survey   

  3. Aims • A standard field methodology • objective • statistically robust • widely applicable • practicable: target time, 1 hour

  4. A A B B Objective ‘No perceptible flow’ in deeper pool Bar bar exposed under low flows Unbroken standing waves observed as shallow flow over riffle

  5. Survey structure • use of transects • survey length • spacing of transects • sweep-up Statisticallyrobust • Between surveyor variability reduced • simple choices • tests on different river types

  6. Widely applicable

  7. RHS form: Two main sections SPOT-CHECKS SWEEP-UP

  8. Features recorded • EROSION • eroding/stable cliffs • DEPOSITION • side/point/mid channel bars • VEGETATION STRUCTURE • channel & banks • FLOW • 10 Flow types

  9. Other features • BANK PROFILES • natural: undercut...gentle • modified: resectioned..embanked • TREES • extent & associated features • CHANNEL FEATURES • waterfall,riffles/pools etc. • boulders, exposed sediment • LAND USE (50m) • 13 land use categories

  10. Management features • MANAGEMENT • resectioning/reinforcement • poaching (trampling) • ROADS & BRIDGES • FLOW REGULATION • weir/sluices/culverts

  11. Baseline survey network From 1994 to 1996 England and Wales 4569 sites Scotland 779 sites Northern Ireland 266 sites

  12. Habitat modification score (HMS) categories 0 Pristine 0 - 2 Semi-natural 3 - 8 Predominantly unmodified 9 - 20 Obviously modified 21 - 44 Significantly modified 45 or more Severely modified Footnote: semi-natural includes pristine channels

  13. Example:assessment of Lowland low energy site with an HQA=65 Distribution of HQA for nearest neighbour sites on PCA map

  14. Application Scales

  15. Flood Defence Obectives Fisheries Obectives Flood Defence issue Channel capacity Fisheries issue No fish Catchment Issue Accelerated Erosion Local authorities Issues Anglers Issues Local Authorities Agenda Anglers Agenda

  16. Aims • Prioritise management • Integrate function management for Catchment Issues • Identify catchment issues • Define strategy tailored to catchment and management needs • Treat problem at source

  17. Prioritise management

  18. Habitat Quality & Modification in England & Wales Uses: Global overview, Leaps, Other local applications HQA HMI

  19. LEAP QUALITY ASSESSMENT

  20. Identify catchment issues

  21. Catchment scale applicationThe Sankey Now Project n=125

  22. Management impact n = 125 n = 4569

  23. Determining a Sub-set of Similar Reference Sites High energy Low energy Low altitude/Low slope High altitude/High slope

  24. n = 125 n = 277 n = 4569

  25. Wooded Agricultural Semi-rural Urban Gen. Info: Landuse in the Sankey Catchment

  26. Define strategy tailored to catchment and management needs

  27. Fisheries interest in riffle rehabilitation first choice: River Weaver

  28. Criteria Used to Assess Rehabilitation Potential

  29. RHS Sites Potential general rehabilitation Potential rehabilitation for fisheries Sites with Rehabilitation Potential

  30. Black BrookSite Prior toRehabilitation

  31. Work in Progress at the Black Brook Site

  32. Test catchment issues

  33. Silt deposition on the Nadder Catchment • Erosion Indicators • Depositional Features • Fine Sediment Source Index

  34. Erosion Indicators

  35. Depositional Features

  36. Fine Sediment Sources

  37. Conclusion • Catchment in a stabilising state • Potential for erosion • Fine sediments from land use run-off

  38. Fisheries Habitats • Habitat suitability model for • Salmon and Trout Fry • Trout Parr • Salmon Parr • Salmonid spawning habitat

  39. F i g . 2 7 : S u i t a b l e S a l m o n i d H a b i t a t s Suitable Salmonid Habitats # S # S # S # S # S # S # S # S # S # S # S # S # S # S # S # S # S # S # S # S S u i t a b l e S a l m o n i d H a b i t a t s # S R i v e r N e t w o r k N a d d e r C a t c h m e n t

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