1. School of Environmental Science and Engineering, Chang'an University, Xi'an, China.
2. School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an, China.
3. Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region (Chang'an University), Ministry of Education, Xi'an, China.
4. School of Civil Engineering, Chang'an University, Xi'an, China.