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All Journal METHOMIKA: Jurnal Manajemen Informatika & Komputerisasi Akuntansi Jurnal Teknik Elektro dan Komputasi (ELKOM)
Anton Widodo
Sekolah Tinggi Meteorologi Klimatologi dan Geofisika
Computer Science & IT Economics, Econometrics & Finance

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Sistem Navigasi Keselamatan Pelayaran Perairan Darat Berbasis Web Anton Widodo; I Putu Putra Wira Sarwa Yudha; Maulana Putra; Agustina Rachmawardani; Nardi Nardi
METHOMIKA: Jurnal Manajemen Informatika & Komputerisasi Akuntansi Vol. 9 No. 2 (2025): METHOMIKA: Jurnal Manajemen Informatika & Komputersisasi Akuntansi
Publisher : Universitas Methodist Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46880/jmika.Vol9No2.pp363-371

Abstract

Navigation safety in inland waters is often threatened by extreme weather conditions such as strong winds and high waves. This study developed SIGADANA, a web-based navigation system that provides early warnings of weather and water conditions in seven major ports: Ajibata, Ambarita, Balige, Muara, Simanindo, Sipinngan, and Tigaras. The system integrates real-time data with hourly temporal intervals from the OpenMeteo API, including wind speed, wind direction, temperature, and humidity, and utilises the JONSWAP model with Boussinesq corrections to estimate significant wave height (Hs) based on local topography and water depth. Furthermore, to assist the analyst team in understanding weather and water patterns in the test area, the system also stores early warning data for a five-year period, 2020-2024. SIGADANA has three main features: (1) historical monitoring of water condition trends, (2) real-time predictions for early warnings up to two hours in advance, and (3) navigation route advisories. To date, particularly in Indonesia, there has been no project estimating wave conditions prior to SIGADANA. Therefore, the system was only evaluated using OLS regression, with results showing that the model was able to explain more than 70% of the data variation. However, there are indications of residual autocorrelation and potential multicollinearity that need to be considered in the interpretation. In the future, SIGADANA is expected to improve navigation safety and has the potential to become a model for other inland waters in Indonesia.
Evaluasi Kualitas Spektral Estimasi Gelombang Smart Buoy Berbasis Sensor Inersia Dimas Wiranata; Anton Widodo
Jurnal Teknik Elektro dan Komputasi (ELKOM) Vol. 8 No. 2 (2026): Jurnal Teknik Elektro dan Komputasi (ELKOM)
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pengukuran gelombang menggunakan sensor inersia pada smart buoy berbiaya rendah rentan terhadap frekuensi frekuensi rendah, kuantisasi periode puncak, dan salah tafsir ketika quality control hanya memeriksa kegagalan sensor. Penelitian ini menyiarkan kualitas spektral 47 rekaman utama yang diperoleh saat prototipe smart buoy mengapung bebas di Perairan Kepulauan Seribu. ICM-20948 diakuisisi pada 20 Hz, dirata-ratakan menjadi 5 Hz, lalu diproses pada jendela 120 s menggunakan koreksi orientasi, detrending, Hann window, dan transformasi Fourier. Tinggi gelombang signifikan berada pada 0,624-1,911 m dengan rata-rata 1,255 m, sedangkan periode puncak berada pada 12-20 s. Analisis tambahan menunjukkan resolusi spektral 0,00833 Hz dan 32 dari 47 rekaman, atau 68,1%, menempatkan puncak spektrum tepat pada batas bawah 0,05 Hz. Proporsi ini memiliki interval kepercayaan Wilson 95% sebesar 53,8-79,6%. Kondisi tersebut tidak terdeteksi oleh wave_qc internal karena seluruh rekaman bernilai nol. Perbandingan kontekstual dengan rentang BMKG menghasilkan 24 rekaman dalam rentang 0,5-1,25 m dan 23 rekaman di atasnya, tanpa dominasi kategori yang bermakna. Temuan menunjukkan bahwa keberhasilan pemrosesan tidak sama dengan keterjaminan kualitas spektral. Pengendalian mutu bertingkat yang menghilangkan fase operasional, sensor bendera, dan okupansi batas frekuensi yang diperlukan sebelum Hₛ dan Tₚ dipakai untuk keputusan operasional.
Co-Authors Agustina Rachmawardani Dimas Wiranata I Putu Putra Wira Sarwa Yudha Maulana Putra Nardi Nardi