Water budget monitoring of irrigated perimeters in semi-arid areas using high resolution NDVI image time series. Application for the assessment of groundwater extraction SPOT4-Take5 Users workshop, Toulouse Nov. 2014 Simonneaux V., Saadi S., Boulet G., Lili Chabaane Z., Mougenot B., Zribi M.
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Water budget monitoring of irrigated perimeters in
semi-arid areas using high resolution NDVI image
time series.
Application for the assessment of groundwater
extraction
SPOT4-Take5 Users workshop, Toulouse Nov. 2014
Simonneaux V., Saadi S., Boulet G., Lili Chabaane Z., Mougenot B., Zribi M.
• Land cover
• Vegetation development
Climate
Irrigation
Evapotranspiration
Infiltration /
pumping
Precipitations
Water budget monitoring of crops using high
resolution NDVI satellite image time series
Objective
Quantification of water fluxes for a
better management
Estimating crop consumption
and irrigation volumes.
Estimating fluxes between
surface and aquifer (recharge /
extraction).
Working steps
1- Calibrating an
evapotranspiration (ET) model
using ground measurements (ET
flux data)
2- Spatialize ET and irrigation
using SPOT HR NDVI time series
3- Validate using irrigation data at
perimeter scale
Satellite
Planners : multi-annual scenarios
1 year time
Farmer (plot scale): daily
Current Date
Managers (perimeter scale): whole season Water needs
Major satellite
input
=> SAMIR tool
Irrigation: 3 types of End Users with specific information requirements
Ex of planning : Pre-allocation before season
ET = ( Kcb*Ks + Ke ) * ET0
Ke = f(top-soil moisture
and bare soil fraction)
Kcb = f(vegetation
development)
Ks = f(root-soil
moisture)
« climatic »
evaporative
demand
Transpiration
Evaporation
Evapotranspiration using the FAO method
dual coefficient approach
Satellite : Kcb = a*NDVI + b
Sentinel-2
time series
Crop development is monitored using Image Time series