【摘要】 给出了冰盖流分析的数学表述 ,考察了阻力项中的Manning糙率 .给出了完全封冻和不完全封冻冰盖流综合糙率的一般计算公式 .当冰盖比 f =1(完全封冻 )时化为Sabaneev公式 ,当 f =0 (完全明流 )时退化为床面糙率 .在长 32m、宽 0 .5m玻璃水槽中进行了实验验证 .利用ADV测流技术实测流速剖面 ,分析壁面切应力流速和分区平均流速以率定不同的壁面糙率 .计算综合糙率与实测值符合很好更多还原

【Abstract】 The mathematical formulation of ice_covered flow was given and Manning roughness coefficient in the resistance term was considered. A theoretical formula of composite Manning roughness coefficient for both full and partial ice_covered flow was concluded. It reduces to Sabaneev formula if cover ratio f=1(full covered flow), and to bed roughness if f=0(full open flow). Experimental verification was carried on in a laboratory flume with 32 m long and 0.5 m wide. The wall roughness coefficients were calibrated by the shearing velocities and zoned average velocities that were analyzed from velocity profiles measured by means of acoustic doppler velometer(ADV) technology. The calculated composite Manning roughness coefficients were in good agreement with the measured values.更多还原