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在混合流的渠道中,由于支渠横向流入的影响,而引起主渠交汇处上游水位的抬高。对于直角锐缘交汇的矩形渠道,在交汇处,水深和支流流量与总流流量之间的比例关系,是由动量方程导出的。运用这种关系,在已确定的渠道中,当水流无干扰时,可以预报交汇处的水深.建议在模型中,应该包含支渠对于主渠动量传递的作用,当支渠流量较大时,这个因素尤其重要。被推荐的这个关系式,当交汇处下游是临界的和非淹没的水流条件时,已由混合流的试验结构得到证实,直角交汇处的混合流研究成果已经直接应用于排水网系统和河流工程.
In the channel of mixed flow, the water level in the upstream of the confluence of the main channel is raised due to the lateral inflow of branch channels. For rectangular channels intersected by right-angled sharp edges, the ratio between water depth and tributary flow to total flow at the junction is derived from the momentum equation. Using this relationship, it is possible to predict the depth of the confluence in a given channel when there is no disturbance in the water flow.It is suggested that this model should include the effect of the branch channel on the momentum transfer of the main channel. When the branch flow is large, this factor Especially important. The proposed relationship, which has been confirmed by the experimental structure of the mixed flow when the confluence is critical and non-submerged flow conditions downstream of the confluence, has been directly applied to drainage network systems and river engineering .