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Open AccessArticle

The Role of Gate Operation in Reducing Problems with Cohesive and Non-Cohesive Sediments in Irrigation Canals

1
Land and Water Development for Food Security, Water Science Engineering, IHE Delft Institute for Water Education, 2611 AX Delft, The Netherlands
2
Numerical Simulation Software, Deltares, 2629 HV Delft, The Netherlands
3
Department of Environmental Sciences, Water Resources Management, Wageningen University and Research, 6708 PB Wageningen, The Netherlands
*
Author to whom correspondence should be addressed.
Water 2019, 11(12), 2572; https://doi.org/10.3390/w11122572
Received: 24 October 2019 / Revised: 1 December 2019 / Accepted: 3 December 2019 / Published: 6 December 2019
Sediments cause serious problems in irrigation systems, adversely affecting canal performance, driving up maintenance costs and, in extreme cases, threatening system sustainability. Multiple studies were done on the deposition of non-cohesive sediment and implications for canal design, the use of canal operation in handling sedimentation problems is relatively under-studied, particularly for cohesive sediments. In this manuscript, several scenarios regarding weirs and gate operation were tested, using the Delft3D model, applied to a case study from the Gezira scheme in Sudan. Findings show that weirs play a modest role in sedimentation patterns, where their location influences their effectiveness. On the contrary, gate operation plays a significant role in sedimentation patterns. Reduced gate openings may cause canal blockage while intermittently fully opening and closing of gates can reduce sediment deposition in the canal by 54% even under conditions of heavy sediment load. Proper location of weirs and proper adjusting of the branch canal’s gate can substantially reduce sedimentation problems while ensuring sufficient water delivery to crops. The use of 2D/3D models provides useful insights into spatial and temporal patterns of deposition and erosion but has challenges related to running time imposing a rather coarse modelling resolution to keep running times acceptable. View Full-Text
Keywords: Gezira irrigation scheme; 2D/3D models; weirs; gate operation; Delft3D Gezira irrigation scheme; 2D/3D models; weirs; gate operation; Delft3D
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Theol, S.A.; Jagers, B.; Suryadi, F.X.; de Fraiture, C. The Role of Gate Operation in Reducing Problems with Cohesive and Non-Cohesive Sediments in Irrigation Canals. Water 2019, 11, 2572.

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