Knowledge of the distribution of contaminants at channel confluences is critical for understanding their transport and dwelling at river networks where flow confluences constitute the key nodes. Flume experiments were conducted to study the distribution of phosphorus adsorption in surface sediment under complex hydrodynamics at channel confluences. The influence of the discharge ratio of the tributary discharge to the main stream discharge was also investigated. The results showed that the horizontal velocity and vertical velocity of flow are the dominant factors affecting the distribution of phosphorus adsorption. Flows with a larger horizontal velocity are not beneficial to phosphorus adsorption on sediment and thus low- and high-adsorption strips of phosphorus occur in the maximum velocity zone and the flow separation zone, respectively. Downwelling flows are beneficial to phosphorus adsorption on sediment as they can enhance phosphorus exchange between overlying water and the bed sediment. A small flo...

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响应水动力作用的汇流床底泥中磷的分布

了解河道汇合处的污染物分布对于了解污染物在河网中的流动和居住至关重要，在河网中，汇流处是关键节点。进行了水槽实验，研究了通道汇合处复杂水动力作用下表层沉积物中磷吸附的分布。还研究了支流排放的排放比对主流排放的影响。结果表明，水平和垂直流速是影响磷吸附分布的主要因素。水平速度较大的流动不利于沉积物上的磷吸附，因此在最高速度区和流动分离区分别发生了磷的低吸附和高吸附条。下行流有利于沉积物上的磷吸附，因为它们可以增强上覆水与床层沉积物之间的磷交换。一个小花...