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Case Study: Microplastic Pollution Transport from the Adyar River to the Bay of Bengal
Summary
Scientists studied how tiny plastic particles (microplastics) flow from a heavily polluted river in Chennai, India into the Bay of Bengal, finding that heavy monsoon rains dramatically speed up this pollution's journey into the ocean. This matters because microplastics that reach coastal waters get absorbed by fish and seafood, which means the plastic pollution from city rivers can eventually end up on our dinner plates. The researchers also built a mathematical model to help predict and track this kind of plastic pollution in other polluted rivers worldwide.
The transport of microplastics from urban river systems into coastal marine environments has emerged as one of the most critical environmental challenges affecting global aquatic ecosystems. In highly urbanized coastal regions, rivers function as major conduits for transporting plastic debris from terrestrial sources into marine environments. In this study, a real-world case analysis was conducted for the transport of microplastics from the Adyar River into the Bay of Bengal. The Adyar River is one of the principal river systems flowing through the metropolitan region of Chennai and receives substantial anthropogenic waste originating from domestic discharge, industrial runoff, urban drainage, stormwater transport, and plastic waste accumulation. During monsoon seasons, increased hydrodynamic flow significantly enhances the transport of suspended microplastic particles toward the coastal marine ecosystem of the Bay of Bengal. Consequently, the selected study region provides an ideal environmental framework for validating the proposed nonlinear compartmental microplastic transport model. The Bay of Bengal is recognized as a highly vulnerable marine zone due to its dense coastal population, industrial activities, port operations, and continuous riverine pollutant inflow. Several environmental studies have identified coastal accumulation of microplastics in sediment layers, marine organisms, and surface waters within this region. Therefore, investigating the transport mechanism between the Adyar River and the Bay of Bengal is of considerable ecological and mathematical significance.