内河多点分散码头大气污染叠加影响特征

Superposition Impact Character of Air Pollution from Decentralization Docks in a Freshwater Port

港口码头大气污染主要为扬尘污染,包括装卸扬尘、道路扬尘、料堆扬尘和裸土扬尘.单个码头和多个分散码头扬尘大气污染在区域特征上具有较大的差异性.以山东济宁港为例,探讨内河港口多点、分散码头的大气面源污染叠加影响,以期为系统评价港口大气污染提供技术支撑.研究表明,内河港口的码头源强小、分布散,对区域空气环境质量总体影响有限,但对港区分布区域的几何中心位置叠加影响最为严重.在不考虑大范围高空气象条件差异和变化时,ADMS模型在预测较大范围内多个污染源的叠加影响方面仍具有较好的适用性.

Air pollution from freshwater port is mainly caused by dust pollution,including material loading and unloading dust,road dust,and wind erosion dust from stockpile,bare soil.The dust pollution from a single dock characterized in obvious difference with air pollution from multiple scattered docks.Jining Port of Shandong Province was selected as a case study to get superposition impact contribution of air pollution for regional air environment from multiple scattered docks and to provide technical support for system evaluation of port air pollution.The results indicate that ① the air pollution from freshwater port occupies a low proportion of pollution impact on regional environmental quality because the port is consisted of serveral small scattered docks;② however,the geometric center of the region distributed by docks is severely affected with the most superposition of the air pollution;and ③ the ADMS model is helpful to attain an effective and integrated assessment to predict a superposition impact of multiple non-point pollution sources when the differences of high-altitude weather conditions was not considered on a large scale.