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(Edinburgh-associated) Research Team

(Edinburgh-associated) Research Team. Dr. Steve Wallis & Catherine Morgan (PhD student) (Heriot Watt University) Dr. Kate Heal & Alan Jones (PhD student) (The University of Edinburgh) Dr. Rebecca Lunn & PhD student? (University of Strathclyde). Flow and quality issues in SUDS ponds.

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(Edinburgh-associated) Research Team

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  1. (Edinburgh-associated) Research Team Dr. Steve Wallis & Catherine Morgan (PhD student) (Heriot Watt University) Dr. Kate Heal & Alan Jones (PhD student) (The University of Edinburgh) Dr. Rebecca Lunn & PhD student? (University of Strathclyde)

  2. Flow and quality issues in SUDS ponds • Combination of modelling (HWU & SU) and field sampling (EU)

  3. Flow attenuation and dilution in SUDS ponds:Research questions • How are flow attenuation and solute dilution related to available storage and outlet configuration? • Mathematical modelling results for pond with v-notch weir at 2m above pond base and various submerged pipes: • 4 diameters • 4 elevations

  4. 1.5m 1.0m Increasing peak flow attenuation 0.5m 0m Anomalies Flow attenuation results Relationship between peak flow attenuation, storage and outlet configuration; legend - pipe diameter; dashed lines – pipe elevation

  5. Flow attenuation results • Summary of key issues: • Peak flow attenuation increases as pipe elevation decreases (more storage available) • Peak flow attenuation increases as pipe diameter increases (less storage used) • Two regimes: • weir used – normal • weir not used - anomolous

  6. 0m Improving water quality 0.5m 1.0m 1.5m First flush dilution results Relationship between peak solute dilution, storage and outlet configuration; legend - pipe diameter; dashed lines – pipe elevation

  7. First flush dilution results • Summary of key issues: • Peak solute dilution increases as pipe elevation increases (more dilution volume available) • Peak solute dilution increases as pipe diameter decreases (more dilution volume available) • Conclusion: • Conflict between flow attenuation and solute dilution

  8. Sediment in SUDS ponds:Research questions Halbeath Pond • Characterise sediment accumulation and quality in SUDS ponds • Investigate sediment particle size-metal concentration relationships • Model sedimentation patterns (and quality?) in SUDS ponds • Provide recommendations for design and maintenance of SUDS ponds • Effect of loss of storage on performance of pond Sediment in Pond 7

  9. Sedimentation patterns and accumulation rates Linburn Pond Main inflow Effect of surface water management train on sedimentation rate: • 1.0 cm a-1 in Halbeath Pond (no management train) • 0.4 cm a-1 in Linburn Pond (management train) 1999 2003 2003

  10. Sediment quality results Increased metal concentrations over time • Sediment quality “hotspots” in ponds, normally close to inlet. • So far mean concentrations of potentially toxic metals, N, P and hydrocarbons in Dunfermline pond sediments do not exceed sediment quality guidelines (e.g. Ontario Ministry of Environment Severe Effect Levels), apart from Ni and Cr in Pond 7. • Mean concentrations close to guideline values for Ni and Cr in all ponds.

  11. Depth (m) Water Sediment 1.0 m 0.3 m Post-processed 450 MHz ground penetrating radar trace of transect across the Wetland 0.5 m 0.7 m Current work • SUDS pond sediment modelling (advection, mixing, settling) • Risk assessment of SUDS pond sediments according to land use • Apply geomorphological principles to model sediment accumulation in SUDS ponds • Use geophysical methods to survey sediment depths in SUDS ponds

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