L293-294 – please describe more in a more detailed manner in the manuscript, how the erosion and dilation methods were applied to post-process the results.Line 135 in section 2.2.2 is duplicated with Line 115, and we have removed the duplicate description (Line 135). Response: We sincerely appreciated for professors’ constructive suggestions. You’ve talked about Sentinel-1 at L114-117, and now you repeat, but mix with Sentinel 2? This is ambiguous, must be rephrased. We have added the relevant description in the manuscript (Line 123 - Line 125). This imaging time completely includes the three stages of the flood: pre-flood, peak-flood and post-flood. We chose images after June 16 that could cover the study area before flood, and images before September 8 to cover the study area after flood. Five floods occurred in the Yangtze River basin in 2020, on July 2, July 12, July 26, Au-gust 14, and August 17. As previously mentioned in the general comments, this must be described in more detail. L120-122 – you state that “We used 320 Sentinel-1 images with an imaging time from Jto Septemto cover the entire flood stage.”, but you do not describe the stages of the floods.We have modified this sentence (Line 87). Please take into account all the aspects pointed out and fully address them. Please find my comments attached in the word document.

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