Declarations
Funding: The research work was funded by the Key Technologies and Application Demonstration of Groundwater Over-Extraction Control and Protection in Huang-Huai-Hai Region (No. 2021YFC3200502).
Competing Interests: The authors have no relevant financial or non-financial interests to disclose.
Availability of data and materials: All data and materials used in the manuscript comply with field standards and they are available.
Authors’ Contributions: All authors contributed to the research. Tianyu Zhou wrote the paper by himself and finished the literature review and data analysis, Longcang Shu proposed the idea of this research and tutored the process of the research, Chengpeng Lu and Bo Liu proposed the idea of this research and joined the process of the research. Four authors read and approved the final manuscript.
Acknowledgements: This work is based on the project “Key Technologies and Application Demonstration of Groundwater Over-Extraction Control and Protection in Huang-Huai-Hai Region”. We gratefully acknowledge the helpful comments and constructive suggestions by reviewers and editors.