the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
| 13 Mar 2024
Apparent Friction Coefficient Used for Flow Calculation in Straight Compound Channels With Trees On Floodplains
Abstract. The interaction of water streams in channels with a complex cross-section, involving the exchange of water mass and momentum between slowly-flowing water in the floodplains and fast water in the main channel, significantly depends on the diversification of the surface roughness between the main channel and floodplains. Additionally, trees strongly increase flow resistance on floodplains, but also significantly in the main channel by intensifying the interaction process. As a result, the water velocity and the discharge capacity of both parts of the channel decrease and at the same time, affecting the flow conditions in the main channel. The results of laboratory experiments were used to determine the effect of floodplain trees on the discharge capacity of the channel with diversified roughness. The reduction in velocity of the main channel caused by the stream interactions is described with the apparent friction coefficients introduced at the boundary between the main channel and the floodplain. The values of resistance coefficients and their changes as a result of the significant influence of trees on the interaction process were determined for various roughness’s of the main channel bottom.
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Status: open (until 12 May 2024)
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RC1: 'Comment on hess-2024-74', Anonymous Referee #1, 26 Mar 2024
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Dear authors, dear publisher,
I find the article perfectly within the scope of the journal and of interest to the community. It deals with friction laws and coefficients for compound channels with experimental and theoretical parts.
However, for me, there is too much in common with the article "Kubrak et al., 2019, Apparent topography friction coefficient used for flow calculation in straight compound channels, Water, 11, 745; doi:10.3390/w11040745" that comes under the heading of plagiarism.
That's why I'm suggesting a major revision. The title of the article is too close to the one already published. Some section titles and content are exactly the same as the previously published article. This is not acceptable, so I suggest that the authors completely rewrite the article to eliminate all duplication.
Furthermore, I think that it is necessary to complete and improve the bibliography, particularly in terms of review of existing resaerchs on the topics, and to clearly highlight the new developments and the scientific obstacles raised in this work and more particularly in relation to their previous work. This will permit to give more in deep feedback.
Best regards
Citation: https://doi.org/10.5194/hess-2024-74-RC1 -
AC1: 'Reply on RC1', Adam Kozioł, 27 Mar 2024
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Dear Reviewer,
thank you very much for reading our present manuscript, but even more so for our previous "Kubrak et al., 2019, Apparent topography friction coefficient used for flow calculation in straight compound channels, Water, 11, 745; doi:10.3390/w11040745".
Referring to paragraph 2 of the reviewer comment, the present manuscript has a lot in common with our previous study (Kubrak et al., 2019) because it is a continuation of research on the same flume model. The first study concerned the flows and structure of turbulence in a compound channel without vegetation (trees) in floodplains. The next stage was to study the influence of trees in floodplains on the flow and structure of stream turbulence. The paper by Kubrak et al., (2019) refers to the first stage of the research - flow without vegetation, while the current one focuses primarily on the effect of trees on the drag coefficients in the main channel, for which data from studies on the structure of stream turbulence in the compound channel was used. Since the present article is the continuation of our research, after the analyses we finally decided to expand the title so that it is very easy to link the two studies. Admittedly, there was a proposal for another title: "The influence of floodplain trees on apparent friction coefficient used for flow calculation in straight compound channels ", but we decided on the current title, emphasizing that it is a continuation of previous studies.
Referring to the 3rd paragraph, as mentioned above, in our opinion, the title of the article should be similar to our previous article, it is a continuation of research on the same model. In fact, the titles and content of some sections are similar to those of a previously published article. This applies only to the basic methodology of determining drag coefficients, especially the description of the three formulas, and it is a small part of the article. Still, all the elements were made exclusively for this work and were never before published. The reviewer suggests eliminating any duplication. The authors believe that the elimination of even partial methodology, formulas and their descriptions is a great loss for the article itself, especially its completeness. It is very often the case that reviewers suggest supplementing the methodology, especially the basic one, and in many cases the formulas and their descriptions are repeated, even in the case of easily accessible articles. This is especially important for young scientists (as has been mentioned many times). The authors will rewrite the said content in the appropriate sections.
Referring to the last paragraph:
1) The literature on this topic and the influence of trees (including emergent vegetation) on the flow in compound channels, including computational methods, has been and is monitored. Before submitting the article, the bibliography was checked and updated. Of course, it is possible that some literature items have been omitted. In such a case, we would like to include them in the article revision.
2) The main objective of the present study is to show the significant influence of trees in floodplains on the values of drag coefficients in the main channel, using measurement data from studies on the structure of turbulence. The work shows that extended and detailed research in this direction is necessary.
3) Expanding the article with additional elements such as: new achievements, scientific difficulties appearing in the research work, especially in relation to the previous work, would require to extend already quite long article text. In our opinion, such elements would be much more suitable for the state-of-art article.Thank you very much for suggestions, we would like to include them in the article revision, especially eliminating the article parts that might be too similar to our precious article.
Citation: https://doi.org/10.5194/hess-2024-74-AC1 -
RC2: 'Reply on AC1', Anonymous Referee #1, 04 Apr 2024
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Dear authors, dear editor,
I fully understand that this article is a continuation of the previous one and that it focuses on vegetation.
As you explain, you have to take up ideas from the previous article, and I completely agree with that. This allows the article to be self-contained. However, you cannot repeat paragraphs as they are in the previous article. That is plagiarism and raises copyright issues, especially as the two articles are not published by the same publisher.
I suggest that you take up all the paragraphs concerned, either by summarising them, developing them or at least rewording them. I also maintain that you really emphasise the novelty, as this will also avoid the problem of plagiarism (few words in the introduction, different concerned paragraphs and conclusion).
With regard to the bibliography, I was not just talking about taking vegetation into account, but also more generally about the composite coefficient. Since your previous article on the topic there have been other articles on the subject, some of which are giving reviews on the topic of friction and compound channels and should be cited. For example (not the only ones) :
- Fernandes, J. N. (2021). Apparent roughness coefficient in overbank flows.
- Zohreh Sheikh Khozani, Khabat Khosravi, Binh Thai Pham, Bjørn Kløve, Wan Hanna Melini Wan Mohtar, Zaher Mundher Yaseen; Determination of compound channel apparent shear stress: application of novel data mining models. Journal of Hydroinformatics 1 September 2019; 21 (5): 798–811. doi: https://doi.org/10.2166/hydro.2019.037
I stand by my initial opinion regarding the good quality and interest of the article. The content is perfectly suited to the target journal. For me, the points I have mentioned are easy to address but essential, which justifies to keep my initial suggestion to the editor : "reconsidered after major revisions".
Best regards
Citation: https://doi.org/10.5194/hess-2024-74-RC2 -
AC2: 'Reply on RC2', Adam Kozioł, 05 Apr 2024
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Dear Reviewer,
Thank you very much for your valuable suggestions and comments.
We agree, that all remarks should be included in the revised manuscript.
Sincerely,
AuthorsCitation: https://doi.org/10.5194/hess-2024-74-AC2
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AC2: 'Reply on RC2', Adam Kozioł, 05 Apr 2024
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RC2: 'Reply on AC1', Anonymous Referee #1, 04 Apr 2024
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AC1: 'Reply on RC1', Adam Kozioł, 27 Mar 2024
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