Estimating Effects of Natural and Anthropogenic Activities on Trophic Level of Inland Water: Analysis of Poyang Lake Basin, China, with Landsat-8 Observations
, Chao Du 1, Jie Xu 6, Yuan Li 7, Runfei Zhang 1,2 and Chao Huang 1
Round 1
Reviewer 1 Report
The manuscript is well organized and quality work on inland water body monitoring. However, some points to be addressed for enhancement of the readability of the manuscript:
1. Line no. 86-90 provides more focused information about the Landsat-8. Please remove general information and focus on the applicability of the data for inland water body monitoring.
2. Lines no. 112-114, have no continuous flow in the sentence. Please maintain the flow and interlinking with the above and below lines.
3. In figure 1, do proper numbering of sub-sections of figures.
4. Provide a table for satellite data used in the study (material section).
5. In line 276, provide the citation of the ‘Pearson correlation coefficient’.
6. Correct the space between the words and proper punctuation.
Author Response
Dear Reviewers,
We greatly appreciate your consideration and reviewers’ insightful comments on our manuscript entitled “Estimating effects of natural and anthropogenic activities on trophic level of inland water: Analysis of Poyang Lake Basin, China, with Landsat-8 observations” (remotesensing-2242832). We appreciate the time and effort you have taken to provide us with valuable feedback on our work. Those comments are valuable and helpful for improving the quality and clarity of our paper.
After carefully considering the constructive comments from the reviewers, we have revised and improved the manuscript. In response to your first point regarding English language and style are fine spell check required, we have proofread the text, improved sentences’ structure, correct typos, and double-check the equations according to the comments from the reviewers. In addition, the copy of the manuscript editing before our original submission and revision submission have been attached in the end of the Response to Reviewer’s comments for your convenience.
With regard to your second point about some of the statements in the manuscript are not expressed appropriately, we have also taken steps to address this concern. Specifically, we have carefully reviewed the entire manuscript and checked the accuracy of the statements, making careful revisions to any statements that were found to be inaccurate, which we believe has strengthened the scientific validity of our study.
Finally, we would like to express our appreciation for your constructive criticism and suggestions, which have helped us to improve our manuscript. We hope that the revised version of our manuscript meets your expectations and satisfies the rigorous standards of your journal. Revised portions were marked with red in the paper. Please refer to the attachment for specific details.
Thank you again for your time and effort in reviewing our manuscript. We would like to thank you and the reviewers for your valuable feedback and guidance. Thanks and Best regards!
Your sincerely.
Dr. Zhubin Zheng
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Review comments — Major
This study used the field measurements of Poyang Lake and Zhelin Reservoir in 2016 and 2019 to construct an evaluation model applicable to the eutrophication of waters in Poyang Lake Basin, and analyzed the spatial and temporal distribution patterns of eutrophication of waters in Poyang Lake Basin and driving factors from 2013 to 2020.
Generally, the research topic is interesting, and the technical approach is feasible. This is a well-written paper on remote sensing monitoring of eutrophication in water bodies, and it has important reference and promoting functions for understanding the process of eutrophication and its driving factors. Compared with previous studies, the study has constructed a remote sensing evaluation model for water body eutrophication in the Poyang Lake Basin by utilizing remote sensing reflectance data and chlorophyll a concentration. In addition, this study analyzed the spatial and temporal distribution patterns of eutrophication of waters in Poyang Lake Basin and analyzed the driving forces. I would recommend accepting this paper after major revisions with the following points:
Throughout the manuscript:
1. All abbreviations in each part of the manuscript including abstract and contents, as well as in the Table and Figure, should be introduced for the first time despite how common or not the abbreviation is.
Materials and Methods
1. Lines 183: Why was the TLI index used instead of the TSI and TSIM indices in this study? Please elaborate in detail.
Discussion
1. Lines 470: What are the advantages of the model proposed in this study? How does it differ from the models proposed in previous studies? Please elaborate in detail.
Minor comments:
Line 66: It is suggested to change "TSIM" to “TSIM”, please revise it carefully.
Line 108: Suggest to change "1.62×105km2" to "1.62×105km2", please revise it carefully.
Line 220: What does NIR refer to? No matter how common the abbreviation is, the first time it appears, its full English name should be used, so please revise it carefully.
Line 260: It is recommended to unify the font format, please revise it carefully.
Line 486: It is recommended to unify the text format in the table, please revise it carefully.
Lines 721-724: There is an error in the reference, please revise it carefully.
Author Response
Dear Reviewers,
We greatly appreciate your consideration and reviewers’ insightful comments on our manuscript entitled “Estimating effects of natural and anthropogenic activities on trophic level of inland water: Analysis of Poyang Lake Basin, China, with Landsat-8 observations” (remotesensing-2242832). We appreciate the time and effort you have taken to provide us with valuable feedback on our work. Those comments are valuable and helpful for improving the quality and clarity of our paper.
After carefully considering the constructive comments from the reviewers, we have revised and improved the manuscript. In response to your first point regarding English language and style are fine spell check required, we have proofread the text, improved sentences’ structure, correct typos, and double-check the equations according to the comments from the reviewers. In addition, the copy of the manuscript editing before our original submission and revision submission have been attached in the end of the Response to Reviewer’s comments for your convenience.
With regard to your second point about some of the statements in the manuscript are not expressed appropriately, we have also taken steps to address this concern. Specifically, we have carefully reviewed the entire manuscript and checked the accuracy of the statements, making careful revisions to any statements that were found to be inaccurate, which we believe has strengthened the scientific validity of our study.
Finally, we would like to express our appreciation for your constructive criticism and suggestions, which have helped us to improve our manuscript. We hope that the revised version of our manuscript meets your expectations and satisfies the rigorous standards of your journal. Revised portions were marked with red in the paper. Please refer to the attachment for specific details.
Thank you again for your time and effort in reviewing our manuscript. We would like to thank you and the reviewers for your valuable feedback and guidance. Thanks and Best regards!
Your sincerely.
Dr. Zhubin Zheng
Author Response File: Author Response.pdf
Reviewer 3 Report
remotesensing-2242832 “Natural and anthropogenic activities accelerated the evolution of trophic level of inland water utilizing Landsat-8 observations” Jianzhong Li, Zhubin Zheng, Ge Liu, Na Chen, Shaohua Lei, Chao Du, Jie Xu, Yuan Li, Runfei Zhang, Chao Huang
This article describes a method of using remotely-sensed data from LANDSAT8 to monitor significant water bodies in the Poyang Lake Basin. There is much editing that can be done to improve the presentation of text and figures, but overall it tells a good story.
The title might be more descriptive as “Estimating effects of natural and anthropogenic activities on trophic level of inland water: Analysis of Poyang Lake Basin, China, with Landsat-8 observations”. Language expressions is a persistent problem in the article, with many sentences split arbitrarily, questions left hanging without punctuation or completion, and common translation problems with non-native English speakers.
Table 1 is excessively long, although it thankfully does not list all 172 combinations, and might be best showing only the top 10 combinations, or perhaps just the combinations including only selected Bands 1, 3 and 5. The authors should substitute the M parameter if equation (5) into equation (6) to get TLI(Rrs) = -85.61 * M + 75.51, and then format it the same as equations (1) to (4). I personally prefer the format of equation (6) without the factor of 10 removed, and the authors could change equations (1) to (4) instead to be consistent.
Check spelling on x-axis of Figure 4 for “Bnad5 NIR”. Figure 5 does not have a y-axis label – is this a range from 0-100% for MAPD and the same scale (with no units) for MAD and RMSD? The colour coding in Figure 7 (b)-(f) simply changes with year, but would be better with the mean annual value coded to the colours in Figure 7a. (The same argument can be made for Figure 8) The text describing Figure 7 does not indicate whether the linear trend (of the annual mean value?) is statistically significant, however given only 8 data points this is difficult to estimate.
It is not clear in Section 2.2.2 that each of the four different atmospheric correction (AC) techniques were going to be used and compared to each other, so it came as a surprise in Section 3.1. In fact the first sentence of Section 3.1 is a question asking about the impact of AC models. Then in Section 3.2 we are not told which AC is used to generate TLI(Rrs) in Figure 6, although I expect it to be FLAASH.
The authors need to remind us in Section 4.1 that the entropy weighting system is being used to separate the contributions of the various driving factors shown in Figure 11. Then they need to make a reference to Figure 11 in the text so it does not simply appear. The sentence on lines 481-482 does not make sense.
Author Response
Dear Reviewers,
We greatly appreciate your consideration and reviewers’ insightful comments on our manuscript entitled “Estimating effects of natural and anthropogenic activities on trophic level of inland water: Analysis of Poyang Lake Basin, China, with Landsat-8 observations” (remotesensing-2242832). We appreciate the time and effort you have taken to provide us with valuable feedback on our work. Those comments are valuable and helpful for improving the quality and clarity of our paper.
After carefully considering the constructive comments from the reviewers, we have revised and improved the manuscript. In response to your first point regarding English language and style are fine spell check required, we have proofread the text, improved sentences’ structure, correct typos, and double-check the equations according to the comments from the reviewers. In addition, the copy of the manuscript editing before our original submission and revision submission have been attached in the end of the Response to Reviewer’s comments for your convenience.
With regard to your second point about some of the statements in the manuscript are not expressed appropriately, we have also taken steps to address this concern. Specifically, we have carefully reviewed the entire manuscript and checked the accuracy of the statements, making careful revisions to any statements that were found to be inaccurate, which we believe has strengthened the scientific validity of our study.
Finally, we would like to express our appreciation for your constructive criticism and suggestions, which have helped us to improve our manuscript. We hope that the revised version of our manuscript meets your expectations and satisfies the rigorous standards of your journal. Revised portions were marked with red in the paper. Please refer to the attachment for specific details.
Thank you again for your time and effort in reviewing our manuscript. We would like to thank you and the reviewers for your valuable feedback and guidance. Thanks and Best regards!
Your sincerely.
Dr. Zhubin Zheng
Author Response File: Author Response.pdf
Reviewer 4 Report
Although the structure of the paper is clear and the writing style appropriate, the scientific soundness is low.
Author Response
Dear Reviewers,
We greatly appreciate your consideration and reviewers’ insightful comments on our manuscript entitled “Estimating effects of natural and anthropogenic activities on trophic level of inland water: Analysis of Poyang Lake Basin, China, with Landsat-8 observations” (remotesensing-2242832). We appreciate the time and effort you have taken to provide us with valuable feedback on our work. Those comments are valuable and helpful for improving the quality and clarity of our paper.
After carefully considering the constructive comments from the reviewers, we have revised and improved the manuscript. In response to your first point regarding English language and style are fine spell check required, we have proofread the text, improved sentences’ structure, correct typos, and double-check the equations according to the comments from the reviewers. In addition, the copy of the manuscript editing before our original submission and revision submission have been attached in the end of the Response to Reviewer’s comments for your convenience.
With regard to your second point about some of the statements in the manuscript are not expressed appropriately, we have also taken steps to address this concern. Specifically, we have carefully reviewed the entire manuscript and checked the accuracy of the statements, making careful revisions to any statements that were found to be inaccurate, which we believe has strengthened the scientific validity of our study.
Finally, we would like to express our appreciation for your constructive criticism and suggestions, which have helped us to improve our manuscript. We hope that the revised version of our manuscript meets your expectations and satisfies the rigorous standards of your journal. Revised portions were marked with red in the paper. Please refer to the attachment for specific details.
Thank you again for your time and effort in reviewing our manuscript. We would like to thank you and the reviewers for your valuable feedback and guidance. Thanks and Best regards!
Your sincerely.
Dr. Zhubin Zheng
Author Response File: Author Response.pdf
Round 2
Reviewer 2 Report
The author responded well to the questions and suggestions I raised, and I am convinced that the manuscript is worthy of publication at this time.
