斗笠子卵石沙波运动规律及对航道的影响

Motion law of pebble sand wave in Doulizi and influence on waterway

斗笠子卵石沙波尺度较大,该河段卵石输移与河床演变特性直接影响下游航道的滩险演变与航道稳定性。采用动床模型试验及实测资料分析的方法,得出斗笠子滩卵石沙波形态、运动规律及对航道的影响。结果表明:斗笠子卵石沙波形态为顺行沙垄,波峰和波谷不固定,运动规律表现出明显的不规则性;卵石沙波在涨水阶段运动剧烈,退水阶段运动平缓,运动规律在前人成果上修正得到;卵石沙波未发生于主航槽,且在进入下游东溪口航槽之前分解消失,对航道无明显影响。

The scale of the pebble sand wave in Doulizi is large,and the characteristics of pebble transportation and riverbed evolution directly affect the evolution of the downstream channel and the channel stability.We apply the physical moving bed model experiment,analyze the measured data,and obtain the form and the motion law of the pebble ripples in Doulizi,and the influences of the waterway.The results show that,the form of pebble sand ripples is in the sand ridge stage,the wave crest and wave though are not stable,and the law of motion is obviously irregular.The pebble sand wave in Doulizi moves violently in the water-rising phase,while move lenitively in the water-falling phase,such motion law of pebble sand wave is obtained by amending previous achievements.The pebble sand wave in Doulizi has not occur in the main navigation waterway,and has disappeared before entering the waterway of Dongxikou,which generates no obvious effect on the waterway.