College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University, 1 Yingmen Village, Lanzhou, 730000, Gansu Province, China. wangyucai118@163.com. College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University, 1 Yingmen Village, Lanzhou, 730000, Gansu Province, China. College of Civil Engineering, Hexi University, Zhangye, 734000, China. Yimin Irrigation Experimental Station, Minle County, Zhangye, 734500, China.