EDDLESTON WATER TRIBUTARY MODELLING T. Ball, J Arnott, K Samson - - PowerPoint PPT Presentation

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EDDLESTON WATER TRIBUTARY MODELLING T. Ball, J Arnott, K Samson - - PowerPoint PPT Presentation

Dec 02, 2022 147 likes •386 views

EDDLESTON WATER TRIBUTARY MODELLING T. Ball, J Arnott, K Samson Project meeting 23/2/12 The Scottish Government Outline Upper catchment interventions investigation of potential on Middle and Longcote burns Linking to hydrometric

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EDDLESTON WATER TRIBUTARY MODELLING

  • T. Ball, J Arnott, K Samson

Project meeting 23/2/12

The Scottish Government

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Outline

  • Upper catchment interventions – investigation of

potential on Middle and Longcote burns

  • Linking to hydrometric network
  • Future directions
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ARC spatial analyst Flow accumulation raw output raster Shows ‘theoretical maximum’ accumulation over whole catchment (ie a unit hydrograph type situation)

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The Middle Burn

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Theory of Dam operation (Thomas And Nisbet, 2007 WEJ 21)

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Putting the theory into the models

  • Introduction of LWD into the channel represented as

global increase in roughness (Mannings n), based on values suggested by Odoni and Lane (2010)

  • Increase in floodplain roughness from rip. woodland

represented by increase in n based on Chow (1959).

Odoni and Lane (2010). Assessment of the impact of upstream land management measures on flood flows in Pickering Beck using OVERFLOW. – Forestry Comm

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Middleburn design flow 1 in 10 year

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1 in 10 year

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1 in 10 year

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1 in 100 year

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1 in 100 year

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The Longcote Burn

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The Longcote Burn

  • At the Longcote Burn, storage potential for water on the

floodplain in a 1 in 25 year event increased by 12.9% over the baseline condition when1.5km of floodplain was afforested.

  • This storage increased by only 1.6%, to 14.5%, when the

entire floodplain was afforested.

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0.5 1 1.5 2 2.5 3 3.5 4 4.5 1768.97 1691.06 1612.3 1536.37 1463.48 1392.91 1317.11 1240.26 1163.35 1080.04 1002.17 922.92 839.14 756.8 681.08 609.09 541.54 463.77 390.17 319.94 242.04 171.02 97.45 26.12 Volume (1000 m³)

Longcote 25 Year Event - Flood Water Storage

Whole reach wooded 1.5 km wooded Initial conditions

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1 2 3 4 5 6 7 1768.97 1698.65 1626.76 1557.4 1491.47 1427.94 1358.13 1290.77 1220.18 1148.99 1072.98 1002.17 929.91 854.17 779.16 703.99 642.71 580.14 514.71 443.52 377.39 315.63 242.04 178.71 109.24 43.09 Volume (1000 m/s)

100 Year Event - Flood Water Storage

Whole reach wooded 1.5 km wooded Initial conditions

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Future Directions

  • Flow calibration and ratings of hydrometric network –
  • ngoing
  • --> Use of the calibration for model calibration and

refinement

  • Survey and model the Shiplaw burn in a similar way –

possibly the upper main stem

  • Actual planting! (SRDP) and debris/ other management