National Consultation with TNMC 3 May 2005, Bangkok WUP-FIN Phase II Bank erosion study.

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  • Vientiane bank erosion~ 30 km long part of the Mekong

  • ToolsThe EIA 3D hydrodynamic and basic sediment modelNew developments for sediment modeling (sediment fractions, bed load, refined erosion and sediment transport description, bank erosion potential calculation)Bank erosion model

  • Model inputsRiver and floodplain topographyHydrographic atlas data river cross-sections, digital elevation map (DEM) for floodplainBoundary conditionsUpstream discharge and water levelUpstream sediment concentrations (sediment fluxes)Downstream rating curve (at Nong Khai)Downstream sediment concentrationsLanduseBed and bank material characteristicsWind

  • Hydrographic atlas data

  • Model interface for pilot modelEIA 3D model systemHydrodynamicSediment transportation

  • Existing dataMekong River CommissionRiver topography from the digital Mekong Hydrographic atlasRiver bank location from the Mekong Hydrographic atlas in early 1990sHardcopy of old Hydrographic atlas from 1960sDigital elevation map for the land area with 50m resolution from old topographical maps and new SRTM elevation model with 90m resolution

  • Existing dataLao PDRHistorical TSS concentration measurements at Vientiane portDaily water level and discharge in Vientiane portBed changes during time have been measured in two projects: JICA (2004) and bank protection project in 1988Aerial photos from 1991 of Mekong around Vientiane and Nong Khai

    ThailandDaily water level and discharge in Nong Khai

  • Existing dataInternationalBank material analysis made by JICA (2004) and Miazawa et al. (2004)Bed material analysis made by Miazawa et al. (2004) and JICA (2004)Velocity profile measurements on Laos side on three sites done by JICA (2004)Analysis of the bank erosion in Vientiane area made by Rutherford and Bishop (1996) with some mapping comparing the old and new Mekong Hydrographic Atlas

  • Data request from TNMCHydrologyHourly WL data from Nong Khai station (all the available years)Water level data in other places than Nong Khai inside the modelling areaData from ADCP runs at Nong Khai (all the available runs)Other discharge / flow velocity information

    Water qualityTSS concentration measurements at Nong Khai (all the available years)Depth integrated suspended sediment concentration measurements at Nong KhaiSuspended sediment grain size analysis Bed load measurements

  • Data request from TNMCSoil and bathymetry dataBank material analysis for Thailand side from model area by national agenciesBed material analysis for Thailand side from model area by national agenciesBathymetry data for Mekong from model area (other data than Hydrographic atlas data)

    OtherAerial photos from 1960s of Mekong around Vientiane and Nong Khai, archived in BangkokLand use in the river banks, floodplains

  • Field data collectionLateral (morphological) changes in river bankComparing the aerial photos and satellite imagesSS concentration combined with the ADCP measurementsCross section changesSelection of cross sections will be monitoredLongitudinal section changesBathymetry of the riverMissing areas from hydrographic atlasPossible changes during the last 15 years

  • Field data collectionMaterial analysis in river bed and bank Bank profile and landuseRecording current meter

  • Direct model outputsVertical and horizontal velocity and sediment distributionsBed shear stresses and bed erosion/ sedimentationBed sediment distributions and their changes over timeBank erosion potential and changes over timeMorphological changes

    MRCS/WUP-FIN www.eia.fi/wup-fin

    Introductory training course on WUP-FIN modelling and assessment toolsWUP-FIN Phase 1

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