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41 results on '"Widiaratih, Rikha"'

3. EXTREME UPWELLING EVENTS IN THE SEAS OF THE ALOR KECIL, ALOR ISLAND, INDONESIA

Author

Wirasatriya, Anindya, Susanto, R. Dwi, Setiawan, Joga Dharma, Agustiadi, Teguh, Iskandar, Iskhaq, Ismanto, Aris, Nugraha, Arief Laila, Kunarso, Ardiansyah Desmont Puryajati, Purwandana, Adi, Ramdani, Fatwa, Lestari, Tri Ayu, Maro, Jahved Ferianto, Kitarake, Yupiter Nungnulang Sondy, Sailana, Yansens L., Goro, Muhammad Saleh, Hidayah, Baeti Karomatul, Widiaratih, Rikha, Fitria, Shoimatul, and Dollu, Efrin Antonia

Published
2023

5. Experimental investigation on validation of the mini wave gauge for ocean wave measurements in comparison to an acoustic doppler current profiler and HOBO.

Author

Widiaratih, Rikha, Putranto, Ari Bawono, Maslukah, Lilik, Wirasatriya, Anindya, Satya, Eridhani Dharma, and Himawa, Daenk

Subjects
ACCELEROMETERS, FOURIER transforms, OCEAN waves, ENVIRONMENTAL monitoring, MARINE resources
Abstract

The real-time monitoring of ocean wave data is a crucial element in marine environmental monitoring and the development of marine resources. It is unfortunate that the majority of wave measurement devices remain challenging, relatively high-priced, and require sophisticated technology. This study investigates the validation of a new type of ocean wave measurement, designed based on the mini wave gauge (MWG), using low-cost materials. The study utilizes an accelerometer sensor, specifically the ADXL335, which is converted to measure wave height, and the GY-271 designed to measure wave direction. This research addresses the validation of MWG by comparing measurements from the acoustic doppler current profiler (ADCP) and HOBO. The validation of wave height demonstrates high accuracy, with a MAPE percentage of 0.46% between MWG and ADCP, and 23.30% between MWG and HOBO. In contrast, the validation of MWG for wave direction by ADCP still requires improvement, with a MAPE of 36.75%. This is due to the sensor's sensitivity to the earth's magnetic field, which requires further improvement of the buoy design to accommodate the direction of incoming waves. Additionally, the MWG's sampling rate in milliseconds allows for analyzing wave characteristics based on wave periods using the fast Fourier transform (FFT) method. [ABSTRACT FROM AUTHOR]

Published
2025
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6. Modeling the fate of microplastics in the Sengkarang Estuary, Pekalongan City, Central Java, Indonesia.

Author

Tristanova, Tanya, Ismanto, Aris, Widiaratih, Rikha, Zainuri, Muhammad, Sugianto, Denny Nugroho, Rochaddi, Baskoro, Ismuniarti, Dwi Haryo, Wulandari, Sri Yulina, Hernawan, Undang, Hadibarata, Tony, and Anindita, Malya Asoka

Subjects
MARINE debris, TIDAL currents, SEDIMENT sampling, TERRITORIAL waters, WATER distribution, PLASTIC marine debris
Abstract

Plastic‐containing waste generated from industrial and household activities is usually discharged into rivers. Pekalongan Regency has several rivers that flow into the Java Sea, one of which is the Sengkarang River. Microplastic is a serious pollutant that has prompted enhanced research and experimentation. This study aims to determine the concentration and distribution of microplastics in water and sediment at the mouth of the Sengkarang River, Pekalongan. A total of 10 water samples and five sediment samples were collected from the river body to the deep water area around the Sengkarang River. Modeling of microplastic distribution is made using hydrodynamic modeling and particle tracking models using two‐dimensional mathematical model. The results showed that the abundance of microplastics ranged from 131 to 360 particle/m3 in water samples and 552.5–972.5 particle/kg in sediment samples. The most common types of microplastics found were fibers and fragments. The greatest abundance and distribution of microplastics are found in coastal areas in water samples and mangrove areas in sediment samples. The distribution of microplastics is influenced by tidal currents, wind directions, and also river water discharge. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Long term of sea surface temperature prediction for Indonesia seas using multi time-series satellite data for upwelling dynamics projection

Author

Tresnawati, Restu, primary, Wirasatriya, Anindya, additional, Wibowo, Adi, additional, Susanto, R. Dwi, additional, Widiaratih, Rikha, additional, Setiawan, Joga Dharma, additional, Maro, Jahved Ferianto, additional, Dollu, Efrin Antonia, additional, Fitria, Shoimatul, additional, and Kurang, Rosalina Yuliana, additional

Published
2023
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40. Pola Arus Di Perairan Kabupaten Jepara

Author

Ranadipura, Abdillah, primary, Sugianto, Denny Nugroho, additional, Atmodjo, Warsito, additional, Suryoputro, Agus Anugroho Dwi, additional, Subardjo, Petrus, additional, and Widiaratih, Rikha, additional

Published
2019
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