Nodal network modelling by integrating remote sensing derived actual evapotranspiration with spatial water balance in a demand driven irrigation system.

Muhammad Ullah, Muhammad Hafeez, Josh Sixsmith, Ralph Faux

Research output: Book chapter/Published conference paperConference paperpeer-review


South Wales, Australia. It covers approximately79,000 ha of intensive irrigation and comprise of number of secondary and tertiary canals. In order to capturethe spatial variability, CIA has been divided into 22 nodes based on direction of flow and connectivity. Allhydrological data of inflow (i.e. surface water supplies, tubewells pumping, rainfall and capillary upflow) andoutflow components (i.e. actual Evapotranspiration, deep drainage, and surface outflow) were measured for allestablished nodes of CIA.Accurate maps of various agriculture crops using high spatial resolution satellite images (ALOS/AVNIR)was developed for each cropping season. Landsat 5 TM satellite images were used to estimate seasonal actual ETand the results were compared with the data obtained from Eddy Covariance flux tower. Initial results from nodalnetwork water balance model are very promising and provide a deep insight about the spatial variation in cropwater demand for each node within the CIA. The results also provide a practical way forward for improving thewater use efficiency at node scale.The long-term sustainability of water for agriculture is in doubt in many regions of the world. The majorwithdrawals of water are for agriculture, industry, and domestic consumption. Irrigated agriculture is majorconsumer of fresh water, but a large part of the water devour for irrigation is wasted due to poor management ofirrigation systems. Improving water management in irrigated areas and assessment of irrigation performance arecritical activities for this endeavour. These activities are needed not only to improve water productivity, but also toincrease the sustainability of irrigated agriculture and improving the irrigation efficiency. The improvement of thewater use efficiency entail the complete understanding of various components of water balances such as rainfall,surface water, groundwater and evapotranspiration (ET).Evapotranspiration is the overriding aspect of water balance at farm to
Original languageEnglish
Title of host publicationEuropean Geosciences Union
Place of PublicationAustralia
PublisherEGU General Assembly
Number of pages1
Publication statusPublished - 2010
EventEuropean Geosciences Union - Vienna, Austria, Austria
Duration: 02 May 201007 May 2010


ConferenceEuropean Geosciences Union

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