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Vientiane – Nong Khai modelling status

Vientiane – Nong Khai modelling status. National consultation with TNMC 20th of April 2006, Bangkok MRCS WUP-FIN. Bank erosion model in Vientiane- Nong Khai. magnitude of change motivation: causes analysis, support in protection measures, transboundary impact assessment

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Vientiane – Nong Khai modelling status

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  1. Vientiane – Nong Khai modelling status National consultation with TNMC 20th of April 2006, Bangkok MRCS WUP-FIN

  2. Bank erosion model in Vientiane- Nong Khai • magnitude of change • motivation: causes analysis, support in protection measures, transboundary impact assessment • model developments, data collection (Lao-Thai cooperation)

  3. Outline • Data status • Study area • WL • Field work • Aerial photos and satellite images • Modelling status • Model framework • Calibration • Outcome

  4. Measured WL • 3 stations by JICA (01/2002- ) • Vientiane port • Nong Khai

  5. Field data: Vientiane – Nong Khai section of Mekong River • ADCP flow and TSS flux, morphometry; Laos- Thai cooperation team, May 2005- May 2006 • Additional grant from Finland (Matti PhD) • CREST Yamanashi programme on Mekong morphometry, 2005-2006 • Iwona Conlan PhD

  6. Field team • Lao PDR: Prasit Dimnivong Phoumyenh Khounthikoumanne Keomany Luanglith • Thailand: Sukkhawit Buaphuan Kiattiyot Yotteentian Sangwian Angkhuan • WUP-FIN: Matti Kummu Jorma Koponen Juha Sarkkula

  7. ADCP measurements coupled with TSS analysis

  8. Discharge

  9. Longitudinal section

  10. Vientiane – Nong Khai

  11. TSS measurements • 9 point samples for each cross-section • 6 times / year • To correlate the backscatter of the ADCP measurements

  12. TSS measurements

  13. Database

  14. Historical bank erosion analysis • Based on aerial photos and satellite images + GPS survey • Aerial photos • 1960s • 1990s • Satellite images • SPOT5 image from 2004

  15. Results

  16. Modelling status • Data status • Study area • WL • Field work • Aerial photos and satellite images • Modelling status • Model framework • Calibration • Outcome

  17. Model grid – 50m resolution

  18. Grid elevations

  19. Boundary conditions Boundary at CS1: Discharge generated from water levels Boundary at CS4: Rating curve based on the ADCP measurements

  20. Model results: velocity fields Surface: Bottom:

  21. Flow field

  22. Modelled velocity distribution in the Vientiane harbor

  23. Vientiane application • Done: • Improved topography • Addition of measured water levels for calibration and validation • Solution of boundary instability • First results of the model calibration (on-going task) • Remains to be done: • Hydrodynamic calibration and validation • Calculation of sediment and comparison with the measured values • Cross section graphics correction

  24. Outcome of the modelling work • Potential bank erosion rates due to the sediment transportation and flow • Impact of the changes in flow regime and/or sediment concentration from upstream • Local impacts ( built structures, bank protection, etc) on flow speeds, erosion, and sediment concentrations • Increase the understanding of the sediment dynamics in Mekong • Increase the understanding of the historical bank erosion • Recommendations • Understanding better the causes of bank erosion

  25. MRCS/WUP-FINwww.eia.fi/wup-fin

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