The use of Delft3D to simulate the deposition of cohesive and non-cohesive sediments in irrigation systems

Abstract

There are many people who were involved and gave lots of assistance and cooperation in this research. The author would like to deliver the gratefulness for their contribution. Firstly, I would like to thank my Promoter and supervisor, Prof. Charlotte de Fraiture PhD, MSc who gave opportunity, ideas and support to this study, also I would like to thank Dr. Bert Jagers from Deltares for always sharing the ideas, knowledge and encouragement, the technical support and guiding me during this research and for his kind brotherly support. Also many thanks to my co-promotor Dr. F.X. Suryadi, PhD, MSc for sharing the ideas and guiding during my research. I would like to thanks would like to thank the Iraqi Ministry of Higher Education and Scientific Research and the Ministry of Water Resources as well for funding my scholarship. Additionally, I would like to thank Deltares in Delft, the Netherlands for their technical support in providing the new version of the Delft3D and all modelling courses and workshops, it really appreciated especially Bert Jagers and Edward Melger. I also express my gratitude for other staff of Hydraulic Engineering-Land and Water Development, I also express my gratitude for other staff of Hydraulic Engineering in Wageningen University and all guest lecturers who have taught me during my study in IHE-Delft. Thanks to all my family of IHE who shared time together and did support each other and I would like to thank Prof. Bart Schultz, PhD, MSc for his help from the beginning, and my best friends Marielle Van Ervan, Mireia Lopez Royo, Zaki Shubber and Tonneke Morgenstond for their kind support. Many thanks to Professor Dano Roelvink, Roel Noorman, Loes Westerveen, Gordon de Wit, Jaap Kleijn and Lennard Teileman for their brotherly help. I would show their appreciation Dr. K.P. Paudel and SMIS for their field data and reports that have other data helpful for this study. Above all, I would like to express my gratefulness for my husband Naser A. Kadhim and my son Ali, I dedicate this thesis as an insignificant gift for your endless love and sacrifices. Finally yet importantly, for others who were not mentioned but contributed to this thesis, I express my gratitude.

Effect of Gate Selection on the Non-Cohesive Sedimentation in Irrigation Schemes

“…The study confirms that gate operations have a significant impact on the overall hydrodynamic and morphologic behavior of the irrigation system [43]. The simulations using a multi-dimensional numerical showed that opening the gate on the side of offtake resulted in less deposition of sediment at the entrance of the offtake than when the gate on the other side of the offtake was opened.…”

“…While the 3D mode provides a slightly better description of the physics involved, the running times are quite long for large irrigation canal networks. Compared to 1D models, the use of Delft3D run in 2D mode has a clear benefit by providing an estimate of the asymmetric development of the hydraulics and morphology, while avoiding the long simulation times of 3D models [43]. However, for the simulations considered here the extra simulation time of the 3D models has not shown a significant benefit for this type of application.…”

Can Mud Deposits Indicate Inundation Extent of Paleotsunamis? Insights From Sediment‐Transport Simulations for Sand and Mud

“…Sediments can be classified into cohesive and non-cohesive. Cohesive sediments are composed primarily of clay-sized material with strong inter-particle forces due to their surface ionic charge and are usually found flocculated in suspension mode (Theol, 2020). On the other hand, non-cohesive sediments are composed primarily of sand material with weak interparticle forces (Theol, 2020).…”

“…Cohesive sediments are composed primarily of clay-sized material with strong inter-particle forces due to their surface ionic charge and are usually found flocculated in suspension mode (Theol, 2020). On the other hand, non-cohesive sediments are composed primarily of sand material with weak interparticle forces (Theol, 2020). They are usually transported by bedload and suspended load during tsunamis (e.g., Sugawara et al, 2014).…”