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.

IAHR members can access the latest issue online. 

Overview

This issue advances the theory and practice of unsteady stream-flows, hydraulic structures (floating breakwater, weirs, manholes), jets, floods, scour and instrumentation. The issue opens with a thought-provoking state-of-the-art paper on hysteresis of flow variables in unsteady stream-flows and demonstrates that the index-velocity and continuous slope-area methods are more suitable to monitor unsteady flows than the widely used stage–discharge approach. It is shown that, contrary to current perceptions, hysteresis can be captured even in small streams and frequently occurring run-off events. 

Readers will also find papers on interesting topics like floating breakwaters (FB) in irregular waves and on hydrofoil weirs, and on floods, for which the datasets are freely available.

Two papers are on jets with one focused on experimental investigation of the effect of offset height effect on turbulent characteristics of twin surface jets and the other devoted to the computation of round thermal jets in an ambient cross flow. 

Another paper presents an experimental study of a new manhole geometry designed to allow the installation of separate sewer systems in narrow streets. 

A promising new formula for maximum local-scour depth prediction can be found in this issue, in addition to a paper that reports on the performance and limitations of three different acoustic Doppler current profilers (ADCP) used to measure bedload transport. The issue concludes with two discussions and closures. 

State-of-the-art paper

• Revisiting hysteresis of flow variables in monitoring unsteady streamflows 
  

  Marian Muste, Kyutae Lee, Dongsu Kim, Ciprian Bacotiu, Marcela Rojas Oliveros, Zhengyang Cheng and Felipe Quintero
  

  Pages: 867-887 | DOI: 10.1080/00221686.2020.1786742

Research papers

• Performance comparison of two similar pontoons as floating breakwater using a spectral approach based on an experiment in regular waves
  

  Seyyed Mohammad Reza Tabatabaei and Hamid Zeraatgar

  Pages: 888-898 | DOI: 10.1080/00221686.2019.1671518

• Discharge coefficient of hydrofoil weirs based on potential flow theory around a symmetric Joukowsky hydrofoil
  

  Elham Bahman, Abdorreza Kabiri-Samani and Mohammad Navid Moghim

  Pages: 899-909 | DOI: 10.1080/00221686.2019.1671519

• Offset height effect on turbulent characteristics of twin surface jets
  

  Mohammad S. Rahman and Mark F. Tachie

  Pages: 910-919 | DOI: 10.1080/00221686.2019.1671522

• Computational simulation of round thermal jets in an ambient cross flow using a large-scale hydrodynamic model
  

  Daniela Malcangio, Alan Cuthbertson, Mouldi Ben Meftah and Michele Mossa

  Pages: 920-937 | DOI: 10.1080/00221686.2019.1684392

• Experimental and numerical study of flood in a river-network-floodplain set-up
  

  Vijay Kisan Mali and Soumendra Nath Kuiry

  Pages: 938-956 | DOI: 10.1080/00221686.2019.1698471

• The hydraulic performance of the storm chamber in a new manhole designed for separate sewer systems
  

  Alaa Abbas, Iacopo Carnacina, Felicity Ruddock, Rafid Alkhaddar, Glynn Rothwell and Robert Andoh

  Pages: 957-967 | DOI: 10.1080/00221686.2019.1698667

• Near-bed eddy scales and clear-water local scouring around vertical cylinders
  

  Francesco Coscarella, Roberto Gaudio and Costantino Manes

  Pages: 968-981 | DOI: 10.1080/00221686.2019.1698668

• Acoustic sampling effects on bedload quantification using acoustic Doppler current profilers
  

  Slaven Conevski, Massimo Guerrero, Axel Winterscheid, Colin D Rennie and Nils Ruther

  Pages: 982-1000 | DOI: 10.1080/00221686.2019.1703047

Discussion

• Statistical analysis methods for transient flows – the dam-break case
  

  Hubert Chanson

  Pages: 1001-1004 | DOI: 10.1080/00221686.2020.1729266

Closure

• Statistical analysis methods for transient flows – the dambreak case
  

  Rui Aleixo, Sandra Soares-Frazão and Yves Zech

  Pages: 1004-1005 | DOI: 10.1080/00221686.2020.1780505