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A Review of Hydraulic Principles of River Water Intake: Focusing on Sediment Control without Submerged Vanes

Document Type : Review paper

Authors

1 Ph.D. Student in Water Science and Engineering – Hydraulic Structures, Department of Agriculture, Urmia University, Urmia, Iran.

2 Professor, Department of Water Science and Engineering – Hydraulic Structures, Department of Agriculture, Urmia University, Urmia, Iran

10.22092/idser.2026.372544.1646

Abstract

Extended Abstract
Introduction
River intakes constitute critical hydraulic infrastructure for sustainable water resource management. A primary challenge in the design and operation of these structures is sediment management, as excessive sedimentation significantly impairs storage capacity and operational efficiency. The intake angle is a pivotal geometric parameter governing flow patterns and sediment transport mechanisms, exerting a substantial influence on the sedimentation process within the river–intake system. The present study provides a systematic literature review covering an 81-year period (1944–2025). We synthesized findings from 132 peer-reviewed articles sourced from reputable domestic and international scientific databases. Following a comprehensive thematic classification, the literature was analyzed using the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) framework. Conceptual synthesis of the reviewed evidence underscores that the intake angle is a fundamental design variable for effective sediment control. These findings offer practical insights for hydraulic engineers and practitioners, facilitating the optimization of intake configurations and enhancing overall water resource management strategies.
Materials and Methods
This study employs a systematic and documentary review to analyze the hydraulic and sediment-control performance of lateral intakes in open channels. Drawing upon 132 national and international publications retrieved from reputable databases between 1944 and 2025, the research synthesizes findings from both laboratory and numerical investigations. The analysis, structured under the PRISMA framework and complemented by a conceptual review approach, identifies the key hydraulic, geometric, and sedimentary parameters affecting intake efficiency. Results indicate that optimized intake angle and position, along with geometric modifications such as sloped walls, submerged vanes, and deflector structures, substantially reduce vortex formation and sediment entry. Numerical modeling using tools such as FLUENT, FLOW‑3D, and SSIIM demonstrates high agreement with experimental data, validating its use for design optimization. Moreover, hybrid and multi‑component designs integrating vanes, sills, and guide walls achieve sediment reduction rates exceeding 70%. The study concludes that sustainable and efficient water‑diversion systems require an integrated design approach balancing hydraulic performance, sediment dynamics, and site‑specific topographic conditions, supported by advanced numerical modeling and experimental validation.
 Results
The review of eleven studies published between 1944 and 2025 revealed consistent patterns in the hydraulic behavior and sediment‑control performance of lateral intakes. Analysis of laboratory and numerical investigations indicated that variations in intake angle, channel curvature, discharge ratio, and intake geometry have the most significant impact on vortex formation, flow separation, and sediment entry. Experimental results showed that reducing the intake angle generally decreases sediment intrusion, while positioning the intake along the outer bend improves flow distribution and minimizes scour depth. Numerical simulations using CFD models such as FLUENT provided strong agreement with experimental findings, confirming the critical role of geometric configuration and shear stress in controlling flow behavior. After multiple comparative evaluations, seven major parameters were identified as the dominant factors governing intake efficiency: intake angle, bend conditions, bed shear stress, relative curvature‑to‑depth ratio, geometry and dimensions of the intake, discharge ratio, and Froude number. These parameters form a unified analytical framework for optimizing intake design to achieve minimal sediment intrusion and stable hydraulic operation.
Conclusions
A comprehensive review of studies conducted between 1944 and 2025 revealed that the hydraulic performance of lateral intakes in open channels is strongly governed by geometric configuration and flow conditions. The intake angle, discharge ratio, and intake position along the channel bend are among the most influential parameters controlling flow patterns, vortex formation, and sediment entry. Findings from previous research indicate that intake angles of 45°–60° effectively minimize flow separation, while positioning the intake on the outer bend (at angles of 115°–135°) enhances flow uniformity and reduces local scour. Both numerical and physical investigations confirm that the geometry of the intake and sidewalls—particularly curved or rounded-corner designs—and regulation of hydrodynamic parameters such as the Froude number play a decisive role in sediment control. The strong agreement between laboratory observations and advanced computational models further supports the reliability of numerical approaches for optimized design.
Overall, achieving stable hydraulic performance in lateral intakes requires an integrated approach that simultaneously considers optimal intake geometry and position, improved hydraulic conditions, and the use of auxiliary structures. Despite significant progress in laboratory and numerical studies, research gaps remain—particularly in field-scale investigations, sediment characterization, and interaction analyses of combined structures under complex flow conditions. Future developments in three-dimensional numerical modeling and large-scale field experiments could substantially enhance understanding of these interactions and lead to more sustainable strategies for sediment management and intake efficiency.
 Conflict of Interest
The authors declare that they have no conflict of interest regarding the preparation and publication of the materials and findings presented in this study.
 Funding
The authors received no financial support for the research, authorship, or publication of this article.
 Data Availability Statements
The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.
 Authors’ Contributions
All authors contributed equally to the conceptualization of the study, preparation of the original draft, and subsequent revisions
Acknowledgement
The authors wish to express their sincere gratitude to the Editor and the two anonymous reviewers for their insightful comments and constructive feedback, which significantly improved the quality of this manuscript. We also thank the Regional Water Company of Qazvin for providing the necessary data for this research.
 

Keywords

Main Subjects

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Irrigation and Drainage Structures Engineering Research
Volume 27, Spring - Serial Number 102
April 2026
Pages 44-17
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History
  • Receive Date: 25 April 2026
  • Revise Date: 06 June 2026
  • Accept Date: 02 August 2026
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