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由季节性和区域性变化引起的水交换能力:对香港水域的评估

Tianan Deng¹, Huan-Feng Duan¹, Alireza Keramat¹

¹Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR 999077.

Marine pollution bulletin

|July 21, 2024

概括

香港水域的停留时间有很大差异,开放区域在不到10天的时间内交换水. 河流排放促进了交换,而潮流限制了交换,影响了污染的脆弱性.

科学领域:

环境科学环境科学
海洋学海洋学海洋学
沿海地区的动态.

背景情况:

了解水体对污染的脆弱性需要评估水交换.
水交换速率的时空变化对于沿海管理至关重要.

研究的目的:

描述香港水域水交换率的时空变化.
评估河流排水和潮流对水停留时间的影响.

主要方法:

实现一个三维的水力动力学和运输模型.
计算水停留时间 (T_re) 作为水交换率的代理值.
进行敏感性实验以评估影响因素.

主要成果:

水中停留时间 (T_re) 在开放水域为<10天,在托洛港超过60天.
河流排放显著加速了西部地区的水交换,在雨季期间将T_re降低了45%-37%.
潮流被确定为水交换的主要限制因素,特别是在冬季.
在米尔斯湾的垂直T_re差异的季节性逆转表明入侵水通过稀释促进了交换.

结论:

沿海水交换能力在香港水域之间有很大差异.
河流排水和潮流是影响水的停留时间和污染脆弱性的关键驱动因素.
这些发现有助于了解海洋污染分布,并为类似环境制定沿海管理策略.

关键词:

沿海污染沿海污染在FVCOM中,我们可以看到香港水域的香港水域材料运输运输材料运输水交换能力的水交换能力.

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