This research aims to analyze and estimate the amount of marine litter which get into seawater intake of PT Trans-Pacific Petrochemical Indonesia (TPPI) Tuban in existing conditions during west monsoon and east monsoon. Ten designs will be simulated to reduce and trap the marine debris entering the seawater intake (SWI). These designs will be tested for their effectiveness in reducing the number of debris entering the SWI using the particle tracking module of MIKE 21 numerical modelling package. The required data in this simulation are wind (speed and direction), wave (significant height, direction and period), the bathymetry of and coastline. Besides, this simulation is conducted based on primary data provided by TPPI Tuban management as the validation data. Based on the simulation results, the amount of marine litter entering SWI in the west monsoon is greater than the east monsoon, which is 349.14 kg/year for west monsoon and 100.84 kg/year for east monsoon. Based on the simulation results using the particle tracking module, it was found that design 5 is the most effective design, with the effectiveness of 73.97%. The biggest accumulation of marine litter using construction design 5 occurred in November, which was 355.36 kg.

本研究旨在分析和估计在西季风和东季风期间在现有条件下进入 PT Trans-Pacific Petrochemical Indonesia (TPPI) Tuban 海水取水口的海洋垃圾量。将模拟十种设计，以减少和捕获进入海水取水口 (SWI) 的海洋垃圾。将使用 MIKE 21 数值建模包的粒子跟踪模块测试这些设计在减少进入 SWI 的碎片数量方面的有效性。该模拟所需的数据是风（速度和方向）、波浪（重要高度、方向和周期）、水深和海岸线。此外，该模拟是根据TPPI Tuban管理层提供的原始数据作为验证数据进行的。根据仿真结果，西季风进入SWI的海洋垃圾量大于东季风，西季风为349.14公斤/年，东季风为100.84公斤/年。根据粒子跟踪模块的仿真结果，发现设计5是最有效的设计，有效率为73.97%。使用建筑设计 5 的最大海洋垃圾堆积发生在 11 月，为 355.36 公斤。