咸潮(又称咸潮上溯、盐水入侵),是一种天然水文现象,它是由太阳和月球(主要是月球)对地表海水的吸引力引起的。当淡水河流量不足,令海水倒灌,咸淡水混合造成上游河道水体变咸,即形成咸潮。咸潮一般发生于冬季或干旱的季节,即每年十月至翌年三月之间出现于河海交汇处,例如长三角、珠三角周边地区。影响咸潮的主要因素有天气变化及潮汐涨退。尤其在天文大潮时,咸潮上溯的情况更为严重。另外,全球气候变化导致海平面上升过程让咸潮十分缓慢地增加,但长期的累积也在逐渐显现。
由于咸潮上溯属于沿海地区一种特有的季候性自然现象,多发于枯水季节、干旱时期。
As a unique seasonal natural phenomenon along the coastal areas, Salty Tide usually occurs in the dry season or the period of drought.
当地水务局的官员称,上海市的自来水供应不会受到持续干旱和随之而来的咸潮入侵的影响。
Shanghai's tap water supply will not be undermined by the lingering drought and the consequent intrusion of saltwater, a local official from the water authority has said.
同时阐述了长江引水三期工程建成后,在咸潮入侵期间对上海市(中心城区)供水调度的改善。
Meanwhile, it also expounds that the completion of the Third Changjiang River Diversion Project will improve Shanghai (central urban area) water supply and Distribution Control during salt tide.
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