Irrigated agriculture is a major consumer of fresh water wordwide, but a large part of theirrigation water is inefficiently used due to poor management of irrigation systems. Toremedy this, decision makers want to have knowledge about low water use efficiencyhotspots. Improving water management is the first priority to enhance the efficiency ofbeneficial use of water which entails the complete understanding of spatial dynamics forpoint (rainfall, surface water, and groundwater) estimates or spatially distributedevapotranspiration (ET) data.Actual ET is the overriding aspect affecting the water dynamics at farm to catchment scale.Satellite remote sensing is a powerful tool to estimate ET over various spatial and temporalscales. For improved irrigation system management, a holistic approach of integratingremote sensing derived ET from SAM-ET (spatial algorithm for mapping ET), for Australianagro-ecosystem, with spatial water accounting model was used to better understand thespatial water dynamics in the Coleambally Irrigation Area (CIA) of the southern MDB. Inorder to capture the spatial dynamics, CIA was divided into 22 nodes based on the directionof flow and connectivity. All hydrological data of inflow and outflow at all nodes wereestimated. Accurate maps of various agriculture crops using high spatial resolution satelliteimages (ALOS/AVNIR) were developed for each cropping season. Landsat 5 TM satelliteimages were used to estimate seasonal actual ET and the results were compared with thedata obtained from Eddy Covariance flux towers installed in CIA.Initial results are quite promising and provide good insights about the spatial waterdynamics for each farm, node and the whole system. Dynamic water use assessment isbeing integrated into decision making maps to understand the low efficiency hotspots.Thematic maps of water overuse/underuse will be prepared to make efficient decision atdifferent spatial scales.
|Title of host publication||15th Australasian Remote Sensing and Photogrammetry Conference|
|Place of Publication||Australia|
|Publication status||Published - 2010|
|Event||Australasian Remote Sensing Conference and Photogrammetry Conference - Alice Springs, NT, Australia|
Duration: 13 Sep 2010 → 17 Sep 2010
|Conference||Australasian Remote Sensing Conference and Photogrammetry Conference|
|Period||13/09/10 → 17/09/10|
Ullah, M., Hafeez, M., van Bergen, P., & Sixsmith, J. (2010). Dynamics of Water Use through Multi-scale Water Accounting. In 15th Australasian Remote Sensing and Photogrammetry Conference (pp. online). ASPRC.