Comparison of different models of optimal water distribution of canals

Abstract

Abstract The optimized water distribution model of canals refers to meeting the water demand of crops by reasonable water distribution flow rate and time. A reasonable water distribution model can shorten the irrigation duration, reduce the loss of canal water delivery, and improve the utilization rate of irrigation water. In this paper, five canals optimal water distribution models are selected respectively, which are irrigation from upstream to downstream (Irrigation model 1), irrigation from downstream to upstream (Irrigation model 2), continuous irrigation between groups and rotational irrigation within groups (Irrigation model 3), rotational irrigation between groups and continuous irrigation within groups (Irrigation model 4), optimal water distribution model of rotational irrigation (Irrigation model 5). These models were applied to the Fengqigou branch canal in the Bojili irrigation district. The advantages and disadvantages of each model are discussed and analyzed from five aspects: the total duration of water distribution, the play of canal engineering ability, the leakage loss of canal water delivery, the abandoned water volume, and the operability of irrigation managers. The results show that irrigation model 1 and irrigation model 2 are easy to manage and have small leakage losses for upper-level canal. Irrigation model 3 and irrigation model 4 have a short total irrigation duration and low water abandonment. Irrigation model 5 needs to optimize the idle time to improve the applicability of the model.