National Consultation with TNMC 3 May 2005, Bangkok

WUP-FIN Phase II – Model development

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Nam Songram watershed area

Area: 13 126 km2 Elevation:

• min 135 m amsl• max 675 m amsl

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Tools

2D distributed hydrological model coupled with a 1D hydrodynamic river, reservoir and lake model• Physical model of the application area that takes into

account variability in elevations, soil properties, vegetation, land use etc.• Run through a GIS-type graphical user interface

1D lumped hydrological model HBV 3D hydrodynamic model

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Nam Songkhram application areas

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VMod model structure

Flow from grid boxesobove

overflow

interflow

kerros 2

kerros 1

Pintakerros

Evapotranspiration

ground water flow

Flow to river

Soil layer 2

Soil Layer 1

Surface layer

Wilting pointField capacity

Maximum capacity

Precipitation

One grid box computation Model grid & flow network

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Data

Digital elevation map for the land area with 50 m resolution from old topographical maps and new SRTM elevation model with 90 m resolution (MRC)

Hydrographic atlas for Mekong mainstream, bathymetry of the river (MRC)

The older (1997) and new (year 2002) land use data (MRC).

Soil types (MRC) Location of river networks (MRC) Precipitation from 16 stations at or near the

watershed (MRC)

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Data

Temperature (daily minimum and maximum temperatures) from one station at the watershed and a few further away (MRC)

Evaporation from three stations at or near the watershed and a few further away (MRC)

Discharge and water level observations form two points on the watershed: Ban Tha Kok Daeng and Nam Oon dam

Discharge and water levels from the Mekong mainstream river• Nakhon Phanom measured water levels and discharges• Discharge from DSF to 3D model upper boundary

condition in Mekong mainstream

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Elevation

13126 km2 heights

• min 135m• max 675 m

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Landuse/Irrigated area

89% of landuse agriculture

irrigated 3280 km2 (25% of catchment)

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wateralbic arenosoleutric fluvisoleutric gleysolgleyic acrisolgleyic luvisolgleyic podzolgleyic solonezacrisolplinthic acrisolslope complexSoils

~40 % acrisol ~40 % plinthic

acrisol low water retention

and conductivity

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SAHATSAKHAN

KUMPHAWAPI

NONG_HAN PHANNA_NIKHOM

SAWANG_DAEN_DIN

PHEN

WARITCHAPHUM

SAKON_NAKHON

THA_UTHEN NAKHON_PHANOM

SISONGKHRAM

BAN_PHAENG PHON_PHISAI

BUNG_KAN

BAN_THA_KOK_DAENG SO_PHISAI

BAN_THA_KOK_DAENG/TEMP

Weather data

16 precipitation stations

Temperature data from at least one station

Evaporation, few stations

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Modelling

1km model grid (resolution can be increased)

flow network computed from DEM

16 landuse classes 10 soil classes irrigation and rice

agricultural practice not yet taken into accont

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Model user interface

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Computed flow at Ban Tha Kok Daeng compared to measured data Ban_Tha_Kok_Daeng 68,108

Preliminary flow computation with VMod

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3D hydrodynamic and WQ application

3D hydrodynamic model coupled with a water quality model

3D hydrodynamics flood arrival time, duration and depth in different

locations of the modelled area, other flood characteristics

Water quality: sediment concentration, net-sedimentation, oxygen, etc

Run through a GIS-type graphical user interface

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Input data for the 3D model

River and floodplain topography• Hydrographic atlas data • river cross-sections for Nam Songkhram • digital elevation map (DEM) for floodplain

Boundary conditions• Upstream discharge and water level in Mekong• Upstream dishcarge in Nam Songkhram• Downstream rating curve (in Mekong)

Landuse Wind (Precipitation)

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Digital elevation model and model area

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3D view on the wetlands

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Inundation on Sept 2000

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3D model grid for NSK model

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3D model grid for NSK hydrodynamic model

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Model animation window

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Output

Tool to understand the hydrology of the Nam Songkhram watershed

Scenarios• Landuse• Climate change• Irrigation development• Reservoir development

Floodplain dynamics with the 3D model application

Interaction between Nam Songkhram and Mekong

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Requested data

Socio-Economic data Statistical or spatial district/commune level data

(preferably from many years to see trends) on • primary &secondary occupations, particularly on fish-

related livelihoods • population, including rural/urban population &migration• poverty.

+ info on other reports related to above mentioned issues.

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Requested dataHydrological, hydrodynamic and water quality model data: Cross section data for Nam Songkhram and other tributaries

including areas from both banks and floodplain: survey by DEDP in 1993 or 1994

Water level and discharge data and rating curves from the Nam Songkhram basin:• Nam Songkhram at Ban Chai Buri and Ban Tha Huai Lua• Nam Oon at Ban Phok Yai, Pannanikom and Bang Nong Bua• Nam Yam at Akat Amnuai and Ban Khon Sai• Huai Khong at Ban Tha Sri Chomchun• Huai Hi at Ban Nong Yang• Nam Mao at Ban Kham Hai

Water level at stations measured by NEDECO in 1981-1982 with temporary gauges.

Irrigation data: irrigation practices, location of pumping stations, discharge of pumping in each station, project area and location, etc.

Ground water levels from as many wells as available Detailed data (height, storage capacity, bridge dimensions etc.)

from existing control structures (dams, weirs, dikes, bridges, road embankments, gates) in the basin.

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Expected inputs from the MRCS modelling team and Thai partners

Collection and basic processing of existing data Active participation in training, field

measurements and modeling activities Scenario modeling Participation in field measurement data and

modeling results processing Participation in reporting and publication of

results

Project resources for any specific local application are quite limited. Because of this, applications must get strong local support in form of work force and data collection.

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More information:www.eia.fi/wup-fin

Content of the project’s two phases

Personnel & contact details

Documents downloadable

Training portfolio: presentations, documents, exercises

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