1. School of Water Resources and Electric Power, Qinghai University, Xining 810016, China
2. School of Computer Science, Qinghai University, Xining 810016, China
3. School of Ecological Environment Engineering, Qinghai University, Xining 810016, China
4. Key Laboratory of Ecological Protection and High-Quality Development in the Upper Yellow River, Xining, Qinghai Province, China