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Marine and macroplastic litter monitoring and strategic recommendation for reducing pollution: case study from Semarang City

Zaman Badrus, Ramadan Bimastyaji Surya, Sarminingsih Anik, Priyambada Ika Bagus, Budihardjo Mochamad Arief

Archives of Environmental Protection

2023

Vol. 49, no 4

37--45

Indonesia is one of the largest contributors to global marine litter deposition, given its high population and the largest archipelagic country. The increasing problem of plastic littering has recently attracted the attention of researchers. This study aims to identify marine and macroplastic litter in Semarang City. A field survey was conducted by dividing the beach into 18 sampling grids, each with an area of 1 × 1 m2. A literature survey was also conducted using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) methodology to identify literature that can be used to develop recommendations. The results showed that 6.26–11.16 grams/m2/ day of marine litter and approximately 1.61–4.89 items/m2/day of plastic litter would be deposited on Semarang City beaches. The greatest contributors to macroplastic litter were polypropylene (PP) and low-density polyethylene (LDPE), which should be considered for further intervention. Strategic recommendations were developed based on an in-depth literature survey and best practices in the current field. These also include recommendations that can be used as a reference by policymakers and other stakeholders to reduce marine pollution. The results of this study are expected to provide a multiplier effect on reducing marine pollution for the city.

Coastal Water Properties and Hydrodynamic Processes in the Malacca Strait: Case Study Northeastern Coast of Sumatra, Indonesia

Koropitan Alan Frendy, Barus Ternala Alexander, Cordova Muhammad Reza

Journal of Ecological Engineering

2021

Vol. 22, nr 11

16--29

Dynamic processes in the coastal waters play an important role in regulating the marine pollution distribution caused by riverine inputs and are relevant for coastal management. Here, the coastal water properties were investigated from field measurements and modeling hydrodynamic processes in the northeastern coast of Sumatra. The present study found that the river discharges affect a low salinity of 28–29 psu in the surface waters along near the coastal line. The river discharge might influence by strong La Niña with high rainfall in December 2010. However, the authors suggested that the effect of tidal mixing is stronger than the freshwater discharges, resulting in vertically well-mixed coastal waters in the region. The observed tidal range of 200 cm indicates a strong tidal mixing in the waters. The tidal elevation contributes more than 70% of the total measured sea elevation. The tidal current signal in which the flow pattern simulations show no significant differences among tide and wind-tide driven currents, is also dominant (77%).