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Computational 2D Modelling of Colmation and Decolmation Processes for River Restoration

Research aims to extend a 2D model to simulate colmation and decolmation processes affecting dissolved oxygen levels in rivers. The study focuses on microscopic turbulent flows and uses innovative techniques for model verification. The goal is to aid river restoration schemes towards achieving WFD targets.

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Computational 2D Modelling of Colmation and Decolmation Processes for River Restoration

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  1. 2D modelling of colmation and decolmation processes for river restoration by Alex Stubbs, Cardiff University (stubbsa1@cardiff.ac.uk) Supervisors: Dr Bettina Bockelmann-Evans and Prof. Thorsten Stoesser

  2. Research aims • Extend the existing computational 2D model DIVAST to allow the simulation of colmation and decolmation processes and any resulting change in dissolved oxygen levels • To further understanding of microscopic turbulent flows in both the near-bed and infiltration zones • Utilise new experimental data, obtained using innovative techniques, for model verification and validation • To aid the development and assessment of river restoration schemes towards achieving WFD targets www.wisecdt.org

  3. Major milestones so far www.wisecdt.org

  4. The plan looking forward • Model Cardiff University’s narrow flume (0.3m wide) using DIVAST • Verification and validation data obtained through collaboration with another PhD student undertaking flume experimentation • Extend this model to allow colmation and decolmation processes to be simulated • Present findings to a targeted conference audience during 2018 • Apply model to case study river reaches in South Wales • Collaborative work with Natural Resources Wales • Analyse findings and complete thesis writing for September 2019 submission www.wisecdt.org

  5. In Summary • Year 1 – Completed • Literature review completed • Review paper submitted • Poster presentation at EGU2017 conference • Year 2 – Just starting • Extension of DIVAST, validation and verification of model • Attendance at field specific conference • Application of model to case study scenarios • Year 3 – Looking forward • Analysis of results • Thesis write-up • For further information please contact: Alex Stubbs, Cardiff University (stubbsa1@cardiff.ac.uk) www.wisecdt.org

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