Enhancement and Optimization of Zayandehrud River Channel Geometry Using Hydraulic Modeling and Secretary Bird Optimization Algorithm

Articles in Press

Document Type : Research Paper

Authors

Department of Water Engineering, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran.

Abstract

The geometry of a river cross-section and its morphological changes are among the most important and influential issues in water and river engineering, having a direct impact on the management, health, and flow of the river. Achieving an optimal river cross-section shape is one of the most important structural measures in river management, contributing to flood control and the reduction of human and financial losses. To obtain geometric parameters on cross-sections and hydraulic conditions of the flow, the HEC-RAS software was used on the Zayandehrud River in Isfahan. To determine the optimal river cross-section geometry, the Secretary Bird Optimization Algorithm (SBOA) was implemented. The approach of this study aimed to achieve a maximum dredging volume while maintaining hydraulic stability in the river channel. Then, the optimum cross-section index (OCI), which displays the numerical value of the river cross-section according to its optimal condition, was used to evaluate river cross-sections in their optimal state. Based on the results, the area of the optimized cross-sections gradually increased, and the observed area was far from the optimal geometry towards the downstream. The OCI value was changed between 1% and 53% and also increased from upstream to downstream, indicating a greater need for channel modification downstream. Ultimately, the optimization approach proved highly effective, enhancing the river’s watercourse capacity by 28.89% post-optimization.

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Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 15 September 2025

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