The Journal of Hydraulic Research (JHR) publishes research papers in theoretical, experimental and computational hydraulics and fluid mechanics, relating to rivers, lakes, estuaries, coasts, constructed waterways, and some internal flows such as pipe flows. To reflect current trends in water research, articles that explore outcomes of interdisciplinary hydro-environment studies with a strong fluid mechanical component are especially welcome. Although preference is given to fundamental issues, papers focusing on important unconventional or emerging applications of broad interest are also appreciated.

 Overview

This issue of the Journal of Hydraulic Research comprises six Research Papers addressing a broad range of topics in hydraulic engineering through numerical, experimental, and combined approaches.

The first contribution presents a comprehensive comparison of Navier–Stokes–based and shallow-water–based SPH models for hydrodynamic simulations, providing guidance on their respective performance and applicability. The second paper investigates the air–water flow structure of an abruptly expanding hydraulic jump, offering new experimental insights into a flow configuration commonly encountered in energy-dissipating structures.

Sediment-related processes are examined in a numerical study of erosion in a micro hydrokinetic turbine that accounts for realistic sediment gradation. River and channel-scale hydrodynamics are further explored through an analysis of the effects of tributary floodplains on obtuse-angle bifurcation flows. Another paper presents a comparative study of open-channel and subaqueous gravity flows passing a slope break, challenging existing assumptions about their behaviour.

The issue concludes with an investigation into the impact of reservoir operation on the spatiotemporal distribution of supersaturated total dissolved gas in a large deep reservoir, with implications for aquatic ecosystem protection. Together, these contributions advance current understanding of complex hydraulic processes and provide valuable insights for both researchers and practitioners.

IAHR members can access the latest issue online.
Non IAHR members must access through Taylor & Francis website.

 Research Papers

Comprehensive comparison of NS-SPH and SWE-SPH models for hydrodynamic simulations
Jinwei Xie, Yoshimitsu Tajima and Zili Dai
Pages 651-666 | DOI: 10.1080/00221686.2025.2578783

Air–water flow structure of abruptly expanding hydraulic jump
Jingmei Zhang, Hong Hu, Ruidi Bai, Shenglong Gu and Hang Wang
Pages 667-680 | DOI: 10.1080/00221686.2025.2574712

Erosion of a micro hydrokinetic turbine considering actual sediment gradation
Xin-Yu Wei, Xue-Feng Kang, Junxian Pei and Wen-Quan Wang
Pages 681-695 | DOI: 10.1080/00221686.2025.2582519

Effects of tributary floodplain on obtuse-angle bifurcation hydrodynamics
Saiyu Yuan, Fengyun Wan, Hongwu Tang, Guanghui Yan, Jiajian Qiu and others
Pages 696-712 | DOI: 10.1080/00221686.2025.2589145

A comparative study of open channel and subaqueous gravity flows passing a slope break
Liyun Tao, Heqing Huang, Guoxia Yin and Yakun Wu
Pages 713-722 | DOI: 10.1080/00221686.2025.2589144

Impact of reservoir operation on spatiotemporal distribution of supersaturated total dissolved gas in a large deep reservoir
Chonglin Wang, Jingjie Feng, Jingya Wen, Dexiang Ge, Danlin Peng and others
Pages 723-736 | DOI: 10.1080/00221686.2025.2593284