Abstract: At present , the channel roughness we use after regulation almost all makes use of that before the regulating .Because flow condition and bed configuration and channel roughness vary with regulation , if roughness before regulation is still used , precision of hydraulic calculation would be affected. This paper has discussed estimating method of roughness and inferred estimating formulas of roughness after regulation of river. It is of aid to improve precision of hydraulic calculation .

Key words: channel regulation, roughness, starting condition, composition of bed

摘要： 目前, 河道整治后糙率大多借用整治前糙率.河道整治后改变了水流状态、河床形态, 糙率 也会随之改变, 如仍采用整治前糙率, 会影响水力计算的精度.本文根据整治后水流及河床变化 规律和边界条件, 应用水力学及河流动力学原理, 讨论了整治后的糙率估算方法, 导出了糙率估 算公式, 对提高水力计算的精度有所助益.

关键词: 河道整治, 糙率, 起动条件, 河床组成