顺坝坝头偏角及坝长布置对汊道分流比的影响

Effect of dam angle and length on branching channel flow distribution ratio

针对黑沙洲水道弯曲、分汊、多汊等特点,结合初拟的顺坝平面布置方案,利用二维数模分别计算在不同顺坝坝长及坝头偏角布置条件下黑沙洲水道各汊道分流比,通过分析不同布置条件下各汊道分流比的计算结果,总结汊道分流比变化的规律并得到平面优化布置方案。黑沙洲水道由南、中、北3个水道组成,其中南水道右槽为通航主航道,南水道右槽分流比的提高作为本工程航道整治成功的关键点之一,通过计算分析提出的坝长及坝头偏角布置可为整治平面布置方案的优化提供理论依据。

For Heishazhou waterway bending,branching,branch and other characteristics,combined with the proposed suitable dam layout scheme,we use a two-dimensional mathematical model to calculate the flow distribution ratio of branching channels respectively under the conditions of the different longitudinal dike dam and jetty head angle layout,analyze the calculation results under the different arrangement conditions,and summarize the change rule of diversion ratio to obtain the layout optimization arrangement scheme.Heishazhou waterway divides into three channels of the south,middle and north.The right slot of south channel is the main navigation channel,and the flow distribution ratio of right slot increasing is a key point of waterway regulation project.The calculation analysis of the dam and jetty head angle can provide theoretical basis for the layout scheme of optimization.