Optimal planning and operation of irrigation systems under water resource constraints in Oman considering climatic uncertainty

Schütze, Niels; Kloss, Sebastian; Lennartz, Franz; Bakri, Ahmed Al; Schmitz, Gerd

doi:10.1007/s12665-011-1135-4

Cited by 27 publications

(15 citation statements)

References 29 publications

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“…Furthermore, the developed multi-scale approach is transferable to different climate conditions, e.g. it is implemented and validated for the arid region of Oman (Schütze et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Integrated management of water resources demand and supply in irrigated agriculture from plot to regional scale

Schütze

Wagner

2016

Proc. IAHS

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Abstract. Growing water scarcity in agriculture is an increasing problem in future in many regions of the world. Recent trends of weather extremes in Saxony, Germany also enhance drought risks for agricultural production.In addition, signals of longer and more intense drought conditions during the vegetation period can be found in future regional climate scenarios for Saxony. However, those climate predictions are associated with high uncertainty and therefore, e.g. stochastic methods are required to analyze the impact of changing climate patterns on future crop water requirements and water availability. For assessing irrigation as a measure to increase agricultural water security a generalized stochastic approach for a spatial distributed estimation of future irrigation water demand is proposed, which ensures safe yields and a high water productivity at the same time. The developed concept of stochastic crop water production functions (SCWPF) can serve as a central decision support tool for both, (i) a cost benefit analysis of farm irrigation modernization on a local scale and (ii) a regional water demand management using a multi-scale approach for modeling and implementation. The new approach is applied using the example of a case study in Saxony, which is dealing with the sustainable management of future irrigation water demands and its implementation.

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“…Furthermore, the developed multi-scale approach is transferable to different climate conditions, e.g. it is implemented and validated for the arid region of Oman (Schütze et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Integrated management of water resources demand and supply in irrigated agriculture from plot to regional scale

Schütze

Wagner

2016

Proc. IAHS

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“…The behaviour of agricultural farms and its economy (E) is simulated by a database of crop-water-production functions which is constructed by an extension of the OCCA-SION methodology (Schütze and Schmitz, 2010;Schütze et al, 2012) presented in Grundmann et al (2012). It describes the relationship between the applied amount of water, its salinity and the produced yield for a given combination of crop/soil/climate under the assumption of optimal water application considering climate uncertainty.…”

Section: Integrated Predictive Modelling Simulation and Optimisationmentioning

confidence: 99%

Managing saltwater intrusion in coastal arid regions and its societal implications for agriculture

2016

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Abstract. Coastal aquifers in arid and semiarid regions are particularly at risk due to intrusion of salty marine water. Since groundwater is predominantly used in irrigated agriculture, its excessive pumping -above the natural rate of replenishment -strengthen the intrusion process. Using this increasingly saline water for irrigation, leads to a destruction of valuable agricultural resources and the economic basis of farmers and their communities. The limitation of resources (water and soil) in these regions requires a societal adaptation and change in behaviour as well as the development of appropriate management strategies for a transition towards stable and sustainable future hydrosystem states. Besides a description of the system dynamics and the spatial consequences of adaptation on the resources availability, the contribution combines results of an empirical survey with stakeholders and physically based modelling of the groundwater-agriculture hydrosystem interactions. This includes an analysis of stakeholders' (farmers and decision makers) behaviour and opinions regarding several management interventions aiming on water demand and water resources management as well as the thinking of decision makers how farmers will behave. In this context, the technical counter measures to manage the saltwater intrusion by simulating different groundwater pumping strategies and scenarios are evaluated from the economic and social point of view and if the spatial variability of the aquifer's hydrogeology is taken into consideration. The study is exemplarily investigated for the south Batinah region in the Sultanate of Oman, which is affected by saltwater intrusion into a coastal aquifer system due to excessive groundwater withdrawal for irrigated agriculture.

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“…Assuming a yield reliability of 90%, the resulting 2D-CWPF 0.9 indicates that sorghum achieves a higher yield for a given amount of water and has a higher salt tolerance than maize. However, the price per tonne for maize is higher than for sorghum, which offers a higher profit, if the water quality is good (for more details see Grundmann et al 2012 andSchütze et al 2012b). In addition to the surrogate models (ANN-OGS and the 2D-CWPF 0.9 's), fixed and variable costs for installation and operation of pumping and irrigation equipment are incorporated in the optimisation framework.…”

Section: Test Site: the Wadi Ma'awil Catchmentmentioning

confidence: 99%

Optimal integrated management of groundwater resources and irrigated agriculture in arid coastal regions

2014

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Groundwater systems in arid coastal regions are particularly at risk due to limited potential for groundwater replenishment and increasing water demand, caused by a continuously growing population. For ensuring a sustainable management of those regions, we developed a new simulation-based integrated water management system. The management system unites process modelling with artificial intelligence tools and evolutionary optimisation techniques for managing both water quality and water quantity of a strongly coupled groundwater-agriculture system. Due to the large number of decision variables, a decomposition approach is applied to separate the original large optimisation problem into smaller, independent optimisation problems which finally allow for faster and more reliable solutions. It consists of an analytical inner optimisation loop to achieve a most profitable agricultural production for a given amount of water and an outer simulation-based optimisation loop to find the optimal groundwater abstraction pattern. Thereby, the behaviour of farms is described by crop-water-production functions and the aquifer response, including the seawater interface, is simulated by an artificial neural network. The methodology is applied exemplarily for the south Batinah region/Oman, which is affected by saltwater intrusion into a coastal aquifer system due to excessive groundwater withdrawal for irrigated agriculture. Due to contradicting objectives like profit-oriented agriculture vs aquifer sustainability, a multi-objective optimisation is performed which can provide sustainable solutions for water and agricultural management over long-term periods at farm and regional scales in respect of water resources, environment, and socio-economic development.

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Optimal planning and operation of irrigation systems under water resource constraints in Oman considering climatic uncertainty

Cited by 27 publications

References 29 publications

Integrated management of water resources demand and supply in irrigated agriculture from plot to regional scale

Integrated management of water resources demand and supply in irrigated agriculture from plot to regional scale

Managing saltwater intrusion in coastal arid regions and its societal implications for agriculture

Optimal integrated management of groundwater resources and irrigated agriculture in arid coastal regions

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