Hydrodynamic Behavior of Submerged Floating Tunnels with Suspension Cables and Towers under Irregular Waves
Round 1
Reviewer 1 Report
The structural behaviour of submerged floating tunnels under irregular waves is studied using commercial FE software, leading to some recommendations for the design of these tunnels. The range of designs considered is relatively modest (essentially two different approaches) but the insights are useful. However, the quality of English is poor throughout, and some of the writing is confusing, so the paper requires considerable editing and checking before it would be suitable for publication. Some corrections are given for a few specified pages below, but there are similar errors throughout the paper that need correcting.
page 1
Abstract
case studies are carried out to analyse the feasibility of submerged floating tunnels (SFT) with
run inside the SFT.
in which slack cables occur. In addition..
Introduction
(SFT) is an innovative..
underwater and differ from
[the opening two paragraphs of the Introduction need some more references]
design alternatives for SFTs
delete sentence “They have.. with Norway”
page 6
to analyse … It is assumed that.. boundary conditions. A main span for Type 1 is 1000 m
Type 2 has two arched cables fised at a middle anchorage.
anchorages. Hanger and tethers on the side of the main cables..
page 7
model was set to have 280 m water depth
(periods) of 3.5 m (5 s).. (10 s). The irregular waves..
the tube of the main body is made of reinforced concrete.. 1 m with outer diameter 17 m, 20 m ..
The behaviour of the tube is evaluated with installations depths of 40, 70 and 100 m (the clearance from the top of the tube to the sea surface).
has the form of an A-shape which is 10 m wide..made of reinforced concrete
These specifications are listed in Table 1 and preliminary analysis
is applied, the time series data for each point can be obtained.
page 12
to grow. It can be seen that the motion for Type 2 is smaller
acceleration of the SFT
value tends upwards as
at 6 m wave height
acceleration of Type 2 in 8 m waves is smaller than that for 6 m waves because..
acts, cross section shear forces and moments are generated in the SFT.
page 22
motion of the SFT
SFT. It can be seen that the heave motion is largely affected by the BWR.
compared to 40 m. it can be seen that this is caused by
17(b), slack cable occurred at an installation depth of 40 m.
Author Response
Manuscript # : applsci-637549
Title of Paper : Hydrodynamic Behavior of Submerged Floating Tunnels with Suspension Cables and Tower under Irregular Waves
Authors : Deokhee Won, Jihye Seo, Woo-Sun Park, Seungjun Kim
Response to referees’ comments
Thank you very much for your detailed comments and suggestions. The followings are the summary of the responses and revisions. I believe the manuscript has been improved, and hope it will be accepted for publication.
English editing certification by MDPI
Statements to Reviewer #1:
the quality of English is poor throughout, and some of the writing is confusing, so the paper requires considerable editing and checking before it would be suitable for publication. Some corrections are given for a few specified pages below, but there are similar errors throughout the paper that need correcting.
page 1
Abstract
case studies are carried out to analyse the feasibility of submerged floating tunnels (SFT) with
run inside the SFT.
in which slack cables occur. In addition..
Introduction
(SFT) is an innovative..
underwater and differ from
[the opening two paragraphs of the Introduction need some more references]
design alternatives for SFTs
delete sentence “They have.. with Norway”
page 6
to analyse … It is assumed that.. boundary conditions. A main span for Type 1 is 1000 m
Type 2 has two arched cables fised at a middle anchorage.
anchorages. Hanger and tethers on the side of the main cables..
page 7
model was set to have 280 m water depth
(periods) of 3.5 m (5 s).. (10 s). The irregular waves..
the tube of the main body is made of reinforced concrete.. 1 m with outer diameter 17 m, 20 m ..
The behaviour of the tube is evaluated with installations depths of 40, 70 and 100 m (the clearance from the top of the tube to the sea surface).
has the form of an A-shape which is 10 m wide..made of reinforced concrete
These specifications are listed in Table 1 and preliminary analysis
is applied, the time series data for each point can be obtained.
page 12
to grow. It can be seen that the motion for Type 2 is smaller
acceleration of the SFT
value tends upwards as
at 6 m wave height
acceleration of Type 2 in 8 m waves is smaller than that for 6 m waves because..
acts, cross section shear forces and moments are generated in the SFT.
page 22
motion of the SFT
SFT. It can be seen that the heave motion is largely affected by the BWR.
compared to 40 m. it can be seen that this is caused by
17(b), slack cable occurred at an installation depth of 40 m.
Answer: I've revised a lot of parts as well as what the editor mentioned. In addition, this paper received English editing proof from MDPI.
Author Response File: 
Author Response.docx
Reviewer 2 Report
The manuscript presents a numerical study on the hydrodynamic performance of two different types of design for SFT (submerged floating tunnels). The two types of design both consist of two towers at each end of the SFT and a main cable between the towers. Compared to type 1, type 2 has an additional anchorage between the towers. The global performance of the two SFT designs is analyzed using Abaqus/Aqua. A parametric study for various design variables has been conducted to better understand the hydrodynamic performance. It was found the design of type 2 has better performance.
However, the paper is not written in the level of originality, rigor, and clarity as it should be. English needs to be significantly improved. Comments below are provided for authors to consider.
There are too many grammatical errors in the manuscript. Many sentences and expressions need to be reworded. Some of the examples are listed here. They are by no means exhaustive. The last two sentences of the abstract and section 5 need to be reworded. Line 4 in section 1, "considering at the same time ......" needs to be reworded. Line 8 in section 1, "...... immersion depth volume" should be "...... submerged volume". At the beginning of paragraph 3 in section 1, "...... has been proposed" should be "...... has proposed". The first sentence of the last paragraph in section 1, needs to be reworded. In the first sentence of section 5, "...... were proposed to analyze ......" should be "...... were proposed and analyzed ......" It seems that the unique contribution of this paper is the two types of design for SFT. The authors should better describe their unique contribution in the manuscript. The literature review should also include the state-of-the-art for SFT designs to provide context and help highlight the originality of the paper. Snapshots of the FEA model in Abaqus should be provided. The authors should provide information on convergence analysis for the model.Author Response
Manuscript # : applsci-637549
Title of Paper : Hydrodynamic Behavior of Submerged Floating Tunnels with Suspension Cables and Tower under Irregular Waves
Authors : Deokhee Won, Jihye Seo, Woo-Sun Park, Seungjun Kim
Response to referees’ comments
Thank you very much for your detailed comments and suggestions. The followings are the summary of the responses and revisions. I believe the manuscript has been improved, and hope it will be accepted for publication.
English editing certification by MDPI
Statements to Reviewer #2 :
(1) English Editing
However, the paper is not written in the level of originality, rigor, and clarity as it should be. English needs to be significantly improved. Comments below are provided for authors to consider.
There are too many grammatical errors in the manuscript. Many sentences and expressions need to be reworded. Some of the examples are listed here. They are by no means exhaustive. The last two sentences of the abstract and section 5 need to be reworded. Line 4 in section 1, "considering at the same time ......" needs to be reworded. Line 8 in section 1, "...... immersion depth volume" should be "...... submerged volume". At the beginning of paragraph 3 in section 1, "...... has been proposed" should be "...... has proposed". The first sentence of the last paragraph in section 1, needs to be reworded. In the first sentence of section 5, "...... were proposed to analyze ......" should be "...... were proposed and analyzed ......" It seems that the unique contribution of this paper is the two types of design for SFT. The authors should better describe their unique contribution in the manuscript.
Answer: I've revised a lot of parts as well as what the editor mentioned. In addition, this paper received English editing proof from MDPI.
(2) The literature review should also include the state-of-the-art for SFT designs to provide context and help highlight the originality of the paper.
Answer: I added literature review reference. You can confirm reference list and introduction section.
(3) Snapshots of the FEA model in Abaqus should be provided. The authors should provide information on convergence analysis for the model.
Answer: Figure 5 is FEA model snapshot. And I add verification information of analysis model. This model verified through compared with hydraulic analysis results in reference papers.
Author Response File: Author Response.docx
Round 2
Reviewer 1 Report
The English is much improved - a couple of minor points: on page 3 "on a beam can be resolved into a normal force..," and units for acceleration, currently given as m/s2 should be put into proper SI format. Other than minor checks, the paper is now OK for publication.
Author Response
Dear Editor
applsci-637549R2 “Hydrodynamic Behavior of Submerged Floating Tunnels with Suspension Cables and Tower under Irregular Waves” by Deokhee Won, Jihye Seo, Woo-Sun Park, Seungjun Kim.
Please find enclosed response to referees’ comments and revised manuscript that has been provisionally accepted for publication in Applied Sciences depending upon the revised paper required by the editorial advisory board. Please call me at +82-51-664-3565 if I can be of any assistance. You may also contact me by email at [email protected].
Yours sincerely,
Deokhee Won, Ph.D.
Senior Research Scientist
Coastal & Ocean Engineering Research Division
Korea Institute Ocean Science & Technology
Manuscript # : applsci-637549R2
Title of Paper : Hydrodynamic Behavior of Submerged Floating Tunnels with Suspension Cables and Tower under Irregular Waves
Authors : Deokhee Won, Jihye Seo, Woo-Sun Park, Seungjun Kim
Response to referees’ comments
Thank you very much for your detailed comments and suggestions. The followings are the summary of the responses and revisions. I believe the manuscript has been improved, and hope it will be accepted for publication.
Statements to Reviewer #1:
The English is much improved - a couple of minor points: on page 3 "on a beam can be resolved into a normal force..," and units for acceleration, currently given as m/s2 should be put into proper SI format. Other than minor checks, the paper is now OK for publication.
Answer: I've revised according to your comments.
Author Response File: Author Response.docx
Reviewer 2 Report
Most of the comments are addressed by the authors. The quality of the manuscript is much improved. There are a few places still require authors attention
Although additional references have been added, the authors still need to better describe their unique contribution in this work. Since the cited references for model validation are in Korean, details of the validation study should be included in the manuscript. verification is just as important as validation of the model. A verification study (e.g. mesh-refinement study) should be conducted to confirm that the solution is converged before a validation study is performed. The authors should provide information in this aspect.Author Response
Dear Editor
applsci-637549R2 “Hydrodynamic Behavior of Submerged Floating Tunnels with Suspension Cables and Tower under Irregular Waves” by Deokhee Won, Jihye Seo, Woo-Sun Park, Seungjun Kim.
Please find enclosed response to referees’ comments and revised manuscript that has been provisionally accepted for publication in Applied Sciences depending upon the revised paper required by the editorial advisory board. Please call me at +82-51-664-3565 if I can be of any assistance. You may also contact me by email at [email protected].
Yours sincerely,
Deokhee Won, Ph.D.
Senior Research Scientist
Coastal & Ocean Engineering Research Division
Korea Institute Ocean Science & Technology
Manuscript # : applsci-637549R2
Title of Paper : Hydrodynamic Behavior of Submerged Floating Tunnels with Suspension Cables and Tower under Irregular Waves
Authors : Deokhee Won, Jihye Seo, Woo-Sun Park, Seungjun Kim
Response to referees’ comments
Thank you very much for your detailed comments and suggestions. The followings are the summary of the responses and revisions. I believe the manuscript has been improved, and hope it will be accepted for publication.
Statements to Reviewer #2:
Although additional references have been added, the authors still need to better describe their unique contribution in this work. Since the cited references for model validation are in Korean, details of the validation study should be included in the manuscript. verification is just as important as validation of the model. A verification study (e.g. mesh-refinement study) should be conducted to confirm that the solution is converged before a validation study is performed. The authors should provide information in this aspect.
Answer: I added information of verification for FE analysis. However, I can’t include the graphs because of copyright.
|
For investigation of this model, ABAQUS Aqua FE Program was used. When this FE program is applied to the new type structure such as SFTs, verification of analysis model is very important. This analysis model was verified through comparison with hydraulic experimental study by Kim et al[15]. Oh et al[16] investigated hydraulic experimental study of SFT under regular wave condition. And Dimension of SFT is 98m of length and 23m of diameter. Through this experimental study, wave pressure, motion, and tension force of tether on SFT were evaluated. Kim et al[15] verified comparison between hydraulic experimental study results and analyze results. Element SFT and tethers for FE analysis were beam element(b31) and truss element(T3D2), respectively. Each tether and SFT were connected by Multi-Point Constraint(MPC) option. And they proposed mesh size for FE analysis through parametric analysis. For boundary condition, tethers were constrained three directions and both ends of SFT were only constrained torsional rotation direction. As a results of sway motion of SFT, analysis results had very similar tendency with experimental results according to wave height and period. Also, maximum and minimum tension force of tethers had similar results. Therefore, verified analysis model of SFT was applied in this study |
Author Response File: Author Response.docx
