Based on the river regime of tgp dam area and the arrangement of upper and lower access channels , the experimental research on the influence of such unsteady flow on the navigation , the evaluation of navigable conditions under the unsteady flow and the study of corresponding improvement measures are presented in this paper 本文結(jié)合壩區(qū)河勢特點及上下游引航道布置,試驗研究了大壩泄洪及船閘充泄水非恒定流對上、下引航道通航影響,同時進行了非恒定流通航條件評價及改善措施研究。