The increasing amount of marine litter is a global issue that is also being experienced within the Manila Bay Philippines. To better understand the behavior of litter within the bay, particle tracking simulations of floating litter released from several sources were conducted. Forward-in-time (PTM-FIT) simulation of particle movements showed that during the southwest monsoon season, litter particles released by river sources tend to accumulate toward five hotspots located along the northeastern coastline of the bay. Backward-in-time (PTM-BIT) simulation of particles released from the identified hotspots showed coastal and foreign sources contributing to the litter collected within these areas. PTM-FIT simulations during the southwest monsoon season showed that particles tend to circulate locally within the bay before being transported toward the hotspots. By contrast, PTM-FIT simulations during the northwest monsoon season showed that litter particles tend to travel toward the mouth of the bay, an implication for global marine litter pollution.

海洋垃圾数量的增加是一个全球性的问题，菲律宾马尼拉湾也正在经历这一问题。为了更好地了解垃圾在海湾中的行为，对从多个来源释放的漂浮垃圾进行了粒子跟踪模拟。粒子运动的时间前向（PTM-FIT）模拟显示，在西南季风季节期间，河源释放的垃圾颗粒趋向于聚集在沿海湾东北海岸线的五个热点处。从确定的热点释放的颗粒的及时向后（PTM-BIT）模拟显示，沿海和国外来源对这些地区收集的垃圾产生了影响。西南季风季节的PTM-FIT模拟表明，颗粒倾向于在海湾内局部循环，然后再运往热点。相比之下，西北季风季节的PTM-FIT模拟表明，垃圾颗粒倾向于朝海湾口传播，这意味着全球海洋垃圾污染。