动态规划方法在都江堰毗河供水工程规划中的应用
Application of dynamic planning method to Pihe River Water Supply Works of Dujiangyan Water Project
清澈碧透的毗河，环湾有情，孕育出北部商城的城市绿肺。
Clear and green Pi River and the beloved Round Bay cultivate the vast green belt of the northern commercial city .
毗河