Experimental study of open-channel flow with partial double-layered vegetation Xiaonan Tang, Hamidrez Rahimi, Prateek Singh, Zishun Wei, Yuxuan Wang, Yufan Zhao and Qiangshuai Lu E3S Web Conf., 81 (2019) 01010 Published online: 30 January 2019 DOI: 10.1051/e3sconf/20198101010