Adaptation of pressurized irrigation networks to new strategies ofirrigation management: Energy implications of low discharge andpulsed irrigation

This paper analyzes the consequences of adopting new on-farm irrigation management strategies (lowdischarge rates, long irrigation times and high frequencies) in an existing on-demand and sectorizedpressurized irrigation system in eastern Spain. The sectorized behavior of the network was analyzedusing two criteria: (i) the operating sectors obtained in a first stage by arranging the hydrants dependingon their altitude respecting the pumping station and (ii) the operating sectors obtained by means ofan optimization process. The Simulated Annealing combinatorial metaheuristic optimization techniquewas employed to find the best solution. Random on-demand patterns were generated using a Montecarlosimulation. The hydraulic requirements of the network were analyzed in every scenario by the Epanet2.0 engine. The effect on energy consumption, power requirements and energy costs was assessed takinginto account the electricity tariff billing structure. It was found that reductions in emitter discharge (qe)and Energy consumption (E)-Energy Cost (EC) savings are not inherently related to each other. Certainamounts of E and EC could be saved when the number of sectors and operating time parameters wereproperly selected. Pulsed irrigation in the current scenario showed an energy saving potential of 10.67,6.43 and 6.99% for power capacity, E and EC, respectively.The study has been partially funded by the IMPADAPT project (CGL2013-48424-C2-1-R) with Spanish MINECO (Ministerio de Economia y Competitividad) and Feder funds.Garcia-Prats, A.; Guillem Picó, S. (2016). Adaptation of pressurized irrigation networks to new strategies ofirrigation management: Energy implications of low discharge andpulsed irrigation. Agricultural Water Management. 169:52-60. https://doi.org/10.1016/j.agwat.2016.02.023S526016

Random scenarios generation with minimun energy consumption model for sectoring optimization in pressurized irrigation networks using a simulated annealing approach

A pressurized irrigation network may operate in two ways, namely, on demand and organized under operating sectors. In the first case, the user decides when to irrigate, and the pumping station has to meet the discharge and pressure head requirements of the group of users that is demanding water at any time. In the second case, the operating hydrants at a given moment are previously established, which permits identification of scenarios related to lesser energy consumption. In this work, a new model was developed that identifies such scenarios. The optimization process is carried out by means of simulated annealing (SA). The model was applied to an example and the result obtained was compared with the same network operating on demand and sectorized using the criterion of hydrant elevation with respect to the pumping station. The scenario adopted for SA saved 11.8% and 15.5% in energy consumption compared with the two other scenarios, and decreased the installed power requirement by 38.3% and 21.6%, respectively.García Prats, A.; Guillem Picó, S.; Martínez Alzamora, F.; Jiménez Bello, MA. (2012). Random scenarios generation with minimun energy consumption model for sectoring optimization in pressurized irrigation networks using a simulated annealing approach. Journal of Irrigation and Drainage Engineering. 138(7):613-624. doi:10.1061/(ASCE)IR.1943-4774.0000452S613624138

Influencia de la configuración espacial de la zona regable en le trazado en planta de redes de riego a presión

[EN] This article is an approach to the spatial configuration influence of the irrigated zone on the unit cost (€/ha) of irrigation network construction. The layout design of the all pipeline network case studies was made using the algorithm by García and Guillem (2004), based on graph theory. This algorithm does not use the designer experience, thus producing homogeneous results. Layouts were sized using the modified economic series method (Arviza, 1991).[ES] El presente artículo pretende acercarnos al estudio de la influencia que tiene la configuración espacial de la zona reegable sobre el coste unitario (€/ha) de implantación de una red de riego a presión para riego. El trazado en planta de las redes analizadas en este trabajo se realiza utilizando el algoritmo de García y Guillem (2004), basado en teoría de grafos que elimina la habilidad o experiencia del proyectista generando resultados homogéneos. Estos trazados se dimensionan utilizando el método de la serie económica modificada (Arviza, 1991)Garcia-Prats, A.; Guillem Picó, S. (2007). Influencia de la configuración espacial de la zona regable en le trazado en planta de redes de riego a presión. Riegos y Drenajes XXI. (154):32-38. http://hdl.handle.net/10251/103226S323815