About the Authors

FengXun Qi

Roles Writing – original draft

Affiliation School of Resource and Environment Engineering, Ludong University, Yantai, China

WeiShan Qin

Roles Writing – review & editing

qinws@ldu.edu.cn

Affiliation School of Resource and Environment Engineering, Ludong University, Yantai, China

Xiaohan Li

Roles Software

Affiliation School of Resource and Environment Engineering, Ludong University, Yantai, China

Competing Interests

The authors have declared that no competing interests exist.