辽河干流河道演变与维持河道稳定的输沙水量研究

在对辽河干流河道冲淤演变特性观测研究的基础上，对维持河道稳定的输沙水量进行了分析计算。研究成果表明，辽河河道输沙水量与来沙量大小成正比，上中游河段输沙水量为16.15亿m3，下游河段输沙水量为26.22亿m3，辽河干流下游河段多年平均输沙水量小于不淤(高效)输沙水量，说明现有的来水量不足以维持下游河道的冲淤平衡，要保证下游河道不发生持续性淤积，还需要采取其它措施增加输沙水量，以便维持下游河道的相对稳定。

Evolution of trunk stream channel of Liaohe River and the runoff for sediment transport to maintain the stability of the river channel

According to observation data the evolution of Liaohe River is studied. It is found that the river channel is deposited during small discharge in dry season. In flood season, scour will occur to the channel but silting will happen to the floodplain. After flood season the channel will be re_silted. The river channel is extremely deficient for transport capacity of sediment due to insufficient water amount. In order to stabilize the river channel and reduce the deposition for preventing from shrinkage and mitigating the threat of flood it is necessary to maintain a certain runoff for sediment transportation. Further analysis shows that the necessary runoff for sediment transport is directly proportional to the incoming sediment load, its amount is 1.615 billiion m3 and 2.622 billion m3 for upper reaches and lower reaches respectively. In order to prevent the river channel from accumulative deposition some measures for increasing the runoff are suggested.