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径流的大小是影响河口区咸潮入侵的主要因素。通过磨刀门咸潮物理模型试验,变化上游不同的恒定径流量,观测磨刀门河道咸潮运动规律和咸潮入侵强度的变化特点。试验结果表明流量变化引起的盐度变化上游大于下游,表层大于底层,大潮期间大于小潮期间,落潮阶段大于涨潮阶段。流量对咸界的影响则表现为,流量增加咸界下移,咸界距离河口越远下移幅度越大,咸界距河口最远时咸界下移幅度最大。
The size of runoff is the main factor that affects the saltwater intrusion in the estuary area. Through the sharpening saltwater physical model test, the variation of upstream and downstream constant runoff was observed, and the saltwater movement and the saltwater intrusion intensity were observed. The experimental results show that the change of salinity caused by the change of flow rate is larger than the lower reaches, the surface layer is larger than the bottom layer, and the tide is larger than the tide during the tide and the ebb stage is larger than the tide stage. The effects of the flux on the salty boundary are as follows: the salinity boundary moves down with the increase of the flow rate; the salty boundary moves further away from the estuary, and the salty boundary descends most when the salty boundary is farthest from the estuary.