1. School of Human Settlements and Civil Engineering, Xi'an Jiaotong Univ. Xi'an China
2. State Key Laboratory of Eco‐Hydraulics in Northwest Arid Region, Inst. of Water Resources and Hydro‐electric Engineering, Xi'an Univ. of Technology Xi'an China
3. School of Aviation Operations and Services, Aviation Univ. of Air Force Changchun China