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中文摘要：
污染物在有多个分汉岛的群汉河道中的输运混合特性目前尚不清楚，建立存在5个分汉岛的群汉河道物理模型试验系统，通过试验研究了恒定点源排放下群汉河道中污染物扩散特性和汉道污染物混合机理，试验结果表明：来流流量的增加，使得污染物浓度整体下降，污染物混合均匀程度降低；污染物排污位置的改变，对污染物浓度的分布影响显著；支汊中，污染物沿程输运是一个逐渐混合均匀的过程，但是突扩型支汉例外，其混合均匀性有降低的现象。研究为掌握污染物在群汉河道中的输移混合特性提供了科学依据。
英文摘要：
In order to make clear the characteristics of pollutant transport and mixing in waterway with multi-anabranch, a physical model was set up with respect to a river with multi-anabranch and five islets. The experiment using the model showed that with the upstream flow increasing, the pollutants concentration, as a whole, decreased; the locations when being changed would greatly inaffect the pollutants concentration distribution pattern in the river; and pollutants transporting along its way was a gradual mixing process except for meeting with expanded branches, thus causing the reduction of mixing degree.
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