Simulation of Fine Sediment Transport in Irrigation Canals of the Gezira Scheme with the Numerical Model FSEDT

Osman, Ishraga S.; Schultz, Bart; Osman, Ali; Suryadi, F.X.

doi:10.1061/(asce)ir.1943-4774.0001031

Cited by 10 publications

(13 citation statements)

References 19 publications

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“…In the selected area, 75% of the sediment is silt and clay with grain sizes less than 0.063 mm (considered as cohesive sediment); the remaining 25% is fine sand as mentioned in the analysis of the bed materials done by Reference [1]. Reference [32] concluded that sediment is transported in suspension, based on sediment analysis. More details regarding the canal geometry and hydraulic parameters are presented in Table 2.…”

Section: Case Studymentioning

confidence: 99%

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

Theol

Jagers

Suryadi

et al. 2019

Water

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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.

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Section: Case Studymentioning

confidence: 99%

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

Theol

Jagers

Suryadi

et al. 2019

Water

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“…In the early days of the Gezira scheme these silt loads were beneficial as they acted as a kind of fertilizer. However, the current excessive concentrations silt-up reservoirs and clog irrigation canals, leading to costly measures to mitigate these problems [34][35][36]. The explanation of how this massive increase in silt-load occurred is complex [33,37], but it is evident that the source area is in the highlands of Ethiopia [38], and that the high erosion rates on farm lands not only resulted in low crop yields and poverty, but even changed the hydrology [39].…”

Section: Water Quality; and The Silt Loads Of The Blue Nilementioning

confidence: 99%

Water Value Flows Upstream

Savenije

Zaag

2020

Water

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Arjen Hoekstra postulated in 2001 that the value of water accumulates in an upstream direction: water value flows upstream. The ultimate source of this value is the rain. This original idea he used to develop the water value-flow concept. This article shows that the water value-flow concept has much to offer in terms of contemporary challenges. It is fully consistent with the "Five Bellagio Principles on Valuing Water" that the High Level Panel of Water published in 2017, and can make significant contributions to the first four principles. This article also shows that the concept can make many more contributions, including incorporating precipitationsheds, and thus include the source areas of rainfall in valuing water. Yet, until now, this innovative and potentially ground breaking concept has been largely ignored by researchers and practitioners in the fields of water resources management and economics. We conclude that the value-flow concept is a unique and promising framework for the integrated assessment of the value of water within a water resources system or river basin. We suggest that the concept can be enriched by incorporating instream benefits, water quality, as well as social, cultural, and spiritual values. We also suggest to test whether the concept can be usefully applied, and add value, to the emerging fields of socio-hydrology and water accounting.

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“…Duflow is a program which is used for the simulation of 1D unsteady flow in open canals, for the same canal specifications (following the method described in Osman et al, 2016). Duflow is a program which is used for the simulation of 1D unsteady flow in open canals, for the same canal specifications (following the method described in Osman et al, 2016).…”

Section: Model Calibrationmentioning

confidence: 99%

“…Paudel, 2010 andMunir, 2011). Testing different scenarios of canal operation using FSEDT, they formulated strategies of water management to reduce deposition in irrigation canals (Osman, 2012;Osman et al, 2016). sediment in suspension) in irrigation canals are few.…”

Section: Introductionmentioning

confidence: 99%

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The use of Delft3D for Irrigation Systems Simulations

Theol

Jagers

Suryadi

et al. 2019

Irrigation and Drainage

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Irrigation systems performance and sustainability are affected by sediment deposition. Cohesive sediment (suspended load) is an important problem in irrigation canals and its behaviour is significantly different from that of non‐cohesive sediment (bed load). Most studies on sedimentation in irrigation systems deal with non‐cohesive sediment. Studies on cohesive sediments are mostly done in rivers and estuaries, but not in irrigation canals. The few existing studies on cohesive sediment in irrigation canals are limited by their use of 1D models. Therefore, in this study we test whether an existing 3D model that was designed for rivers and estuaries can be used in irrigation canals. Delft3D was identified as a suitable model. Simulations were done for different sizes and configurations of the irrigation network. After some adaptations to the model, the simulations of different scenarios provided promising results. From a hydrodynamic and morphological point of view the Delft3D model was able to realistically represent water and sediment flows in a hypothetical canal set‐up, consisting of a main canal, a branch canal and several hydraulic structures. Some challenges remain in the use of Delft3D for irrigation canals, in particular regarding wall roughness in small rectangular canals and computation times for complex systems. However, these challenges are not insurmountable and the advantages of using Delft3D are clearly shown in this paper. © 2019 John Wiley & Sons, Ltd.

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Simulation of Fine Sediment Transport in Irrigation Canals of the Gezira Scheme with the Numerical Model FSEDT

Cited by 10 publications

References 19 publications

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

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

Water Value Flows Upstream

The use of Delft3D for Irrigation Systems Simulations

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