Groundwater Dynamics near the Saltwater–Freshwater Interface in an Island of Seto Inland Sea
Round 1
Reviewer 1 Report
1-In the Abstract, general sentences like the first three lines are totally unsuitable for a scientific paper abstract. Also abstract must be one paragraph
2. An abstract should contain the main relevant numerical results. .
3. The Introduction seems to not have a logical path, and from the Introduction is difficult to understand the research gap covered by this work.
4- Study Method is not clear
5- Fig 2 and 3 is one point. It can be used table
6- It is not clear, how the author obtained equation 3
7- The conclusions section is not good, Please rewrite it
Author Response
Thank you very much for your review.
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
The present paper by Yusuke TOMOZAWA et al. reports the water dynamics and groundwater sources in a coastal area based on multiple tracers, under the impacts of human activities and climate change. The findings are interesting. The paper is generally well written. I agree it to be published after some necessary modifications. Moreover, the language should be further improved. The detailed comments are as follows:
Methodology such as "multi-tracer based dating" should be added as a keyword.
More relevant papers should be cited to better describe the application of tracing methods in coastal water dynamics in the Introduction section. The following papers are recommended to be referred to:
(2019) Stable isotope characteristics of water resources in the coastal area of the Vietnamese Mekong Delta, Isotopes in Environmental and Health Studies, 55:6, 566-587.
2. Chengcheng Xia, Guodong Liu, Yuchuan Meng, Fangting Jiang. Reveal the threat of water quality risks in Yellow River Delta based on evidences from isotopic and hydrochemical analyses. Marine Pollution Bulletin, Volume 177, 2022, 113532.
3. Xuejing Wang, Yan Zhang, Manhua Luo, Kai Xiao, Qianqian Wang, Yong Tian, Wenhui Qiu, Ying Xiong, Chunmiao Zheng, Hailong Li. Radium and nitrogen isotopes tracing fluxes and sources of submarine groundwater discharge driven nitrate in an urbanized coastal area, Science of The Total Environment, 763, 2021,144616
Line 89: the citations [24,25] is redundant here, please delete it.
Lines 91-93: the objectives of this paper are not quite clear. what do you what to clarify about "bedrock groundwater"?
Lines 147-150: what is the periodicity of sampling campaigns?
Please mention the tool that was used for groundwater sampling at different depths.
Fig 3: it is suggested to use a box-blot to replace this figure, to better present the distribution of isotopic composition during the observation period.
Lines 209-210: Was the precipitation line made in the same area with this study? please make it clear. what time scale was the precipitation line based on?
Lines 226-235: in different seasons, the isotopic composition in precipitation and groundwater varies greatly, due to the influence of monsoon shift. Therefore, using this rough method to identify the recharge altitude cannot be accurate. At least, the authors should add some sentences to describe this source of uncertainty.
Author Response
Thank you very much for your review.
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
accepted is it
Author Response
Dear Reviewer
Thank you very much for reviewing our manuscript and offering valuable advice.
Corrections have been made to the English text.
Reviewer 2 Report
The authors have given point-to-point responses to the comments from all reviewers. I agree this paper to be published in Water.
Author Response
Dear Reviewer
Thank you very much for reviewing our manuscript and offering valuable advice.
Corrections have been made to the English text.
