DEVELOPING INTEGRATED MODELLING AND MAPPING TECHNIQUES FOR CALCULATING PLASTIC LEAKAGE TO THE WATERWAY FOR THE NATIONAL ACTION PLAN

Aprilia Nidia Rinasti*, Angsana Chaksan, Indradhi Faisal Ibrahim, Khin San Hlaing, Kavinda Gunasekara, Makoto Tsukiji, Ohnmar May Tin Hlaing, Thammarat Koottatep

Abstract

Plastic leakage models are compiled to provide baseline data. The critical elements in this working phase are systematically delivering current management, assisting survey-based condition judgements, and holistic calculations in the spatial context. Leakage modelling incorporated survey results, material flow, and spatial analyses, including proximity and hydrological analyses and weighting calculations. Mapping included global-scale data in a socioeconomic context, optical and thematic remote sensing, and geocoded features, with expected outcomes defined as a hotspot map using ModelBuilder, a designated toolbox for leakage modelling. The results were validated against satellite imagery. The capital city leaked up to 70 t per year into the main river; a small town with major water infrastructure leaked 45 t; and a small town with less waterway access leaked 1.8 tons annually. Plastic accumulation sites accounted for more than 200 items in these cities. The measurement was enhanced by using rough approximations with a container of known capacity, and the plastic exposure in the open environment was estimated to be approximately 220.38 L. Open land, newly developed areas, outskirts, and areas connected to neighbouring cities are vulnerable areas, and their management requires collaboration with neighbouring cities.

Keywords: Plastic waste, Material flow analysis, Hydrology, Mobile-app, Socio-economic

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