1. College of Ecological and Environment, Chengdu University of Technology, Chengdu 610059, China
2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
3. College of Environment Science and Engineering, Guilin University of Technology, Guilin 541004, China
4. China Huaneng Group Co., Ltd., Beijing 100031, China