Analysis of Human Activity Impact on Flash Floods in China from 1950 to 2015
Round 1
Reviewer 1 Report
1 – It is not clear if the authors used to the total period from 1950 on or the second period 2000 – 2015.
2 – Please correct 50 km2.(Sun, (line 100)
3 – Include north arrow and graphical scale
4 – I think that the identification of the flash floods deserves better explanation. How were these floods identified in NFFIE Project? Isn’t this identification (and figure) rather depend on the population? Is a flood occurring in a remote area identified?
5 – The increase of the population (high density/concentration of people) was recognized as one important driving factor for the increase of the number of flash floods. I think that this conclusion is not completely clear as there may be a link between the perception of this floods due to the increase of the impact.
6 – The increase of the urbanization could be incorporated in the driving factors.
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
My only concern is that air pollution may also be both causal and indicative of pollution density and economic activity. Overall well presented and interesting
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Reviewer 3 Report
The paper presents analysis of main compounds affect on flash flood occurence in China. Authors use unique dataset of flash flood records in China from 1950 to 2015 period. One ot the main adventages of the work is used large data set of flash floods that could use to present spatial and temoral analysis of this phenomena and detect of main compounts influence of flash floods. I think that this paper is suitable to main topisc of Sustainability journal and should be interesting to readers on all the World. I have only few minor suggestions to Atuthors that can be considered before paper will be resubmited
- Keywors: should be China
- Table 2: Please explain why 50 mm rainfall treshold was assumed? Any references?
- L190: I am not sure if slope nad changes in latitude shouls be linked with geological component, rather topographic.
- Discussion: It will be good if Authors can add short discuss about mitogation solutions to prevent flash flood, mainly in urban areas, like LID systems, and mentioned about "sponge cities" idea that can reduction of flood hazard. More information can find in following papers: Liang, X.; Liang, Y.; Chen, C.; van Dijk, M.P. Implementing Water Policies in China: A Policy Cycle Analysis of the Sponge City Program Using Two Case Studies. Sustainability 2020, 12, 5261.
Liu, J.; Xue, B.; Yan, Y. The Assessment of Climate Change and Land-Use Influences on the Runoff of a Typical Coastal Basin in Northern China. Sustainability 2020, 12, 10050.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
