大连海上机场施工通道开口宽度对水环境影响的数值研究

Numerical analysis on impact of water environment by construction access with different opening-size of Dalian offshore airport

为保障大连海上机场建成后工程水域的水质环境,以工程水域物理自净能力、水体半更换期、局部污染物扩散轨迹、局部污染物示踪粒子第一次到达湾外的时长等参数为评价指标,基于MIKE21 flow model FM模块建立了非结构网格下的水动力及污染物输移扩散数值模型,对大连海上机场施工通道布置方案进行优化研究。结果表明,施工通道开口宽度对工程水域物理自净能力、水体半更换期、局部污染物扩散轨迹、局部污染物示踪粒子第一次到达湾外的时长等指标有不同程度的影响。不同参数对应的最佳开口宽度不完全一致,综合比较后推荐了施工通道最佳开口方案。

To ensure the environment quality of the water area of Dalian offshore airport, on the basis of the MIKE21 flow model FM module, a numerical model was built for the calculation of the hydrodynamic and pollutant transport by using unstructured mesh. The physical self-purification, half-exchange period, diffusion trajectory of pollutant in local area and the time when tracer particles in local area first get out of the bay were taken as evaluation criteria to study the optimization of opening-size of construction access of Dalian offshore airport. The results show that the opening-size of construction access has influence on the physical self- purification, half-exchange period, diffusion trajectory of pollutant in local area and the time when tracer particles in local area first get out of the bay in different degrees. According to simulated results, an optimal opening-size of construction access is recommended after comprehensive comparison.