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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences BULETIN OSEANOGRAFI MARINA Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Jurnal Ilmu Lingkungan Jurnal Geodesi Undip Jurnal Kelautan : Indonesian Journal of Marine Science and Technology International Conference on Coastal and Delta Areas Jurnal Kelautan Tropis JURNAL METEOROLOGI DAN GEOFISIKA Multidiciplinary Output Research for Actual and International Issue (Morfai Journal) Indonesian Journal of Oceanography Jurnal Impresi Indonesia Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Depik Jurnal Ilmu-Ilmu Perairan, Pesisir, dan Perikanan

Muhammad Helmi

Departemen Oseanografi Fakultas Perikanan Dan Ilmu Kelautan Universitas Diponegoro

Author-ID : 2653286

Religion Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Physics Social Sciences Other

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Mengkaji Area Genangan Banjir Pasang Terhadap Penggunaan Lahan Pesisir Tahun 2020 Menggunakan Metode Geospasial di Kabupaten Pekalongan, Provinsi Ja Maria Griselda Novita; Muhammad Helmi; Rikha Widiaratih; Hariyadi Hariyadi; Anindya Wirasatriya
Indonesian Journal of Oceanography Vol 3, No 3 (2021): Indonesian Journal of Oceanography
Publisher : University of Diponegoro

Perubahan iklim menyebabkan peningkatan suhu yang mempercepat laju muka air laut. Kenaikan muka air laut mengancam wilayah pesisir yang padat penduduk dan juga daratan rendah karena akan menyebabkan banjir rob. Salah satunya adalah pesisir Kabupaten Pekalongan. Banjir rob yang diakibatkan adanya kenaikan muka air laut dan penurunan muka tanah menyebabkan bertambahnya luasan genangan banjir rob di daratan. Penelitian ini melakukan pengolahan data untuk mengetahui karakteristik pasang surut bulan November 2020 dan laju kenaikan muka air laut, melakukan pengolahan data titik tinggi rupabumi untuk mengetahui elevasi muka tanah tahun 2020, melakukan pengolahan citra SAR Sentinel-1 untuk memetakan laju penurunan muka tanah serta mengkaji luas area genangan banjir rob pada penggunaan lahan dengan menggunakan pemodelan spasial genangan banjir pasang tahun 2020 berdasarkan data laju kenaikan muka air laut, ketinggian genangan, elevasi muka tanah, dan laju penurunan muka tanah. Metode yang digunakan pada penelitian ini untuk komponen pasang surut diolah menggunakan metode Least Square, laju kenaikan muka air laut dengan metode ROMS, laju penurunan muka tanah dengan metode DinSAR dan pemetaan genangan banjir rob dengan pemodelan geospasial. Hasil dari penelitian ini menunjukkan selisih nilai HHWL dan MSL pada bulan November 2020 adalah 42,11 cm. Kenaikan muka air laut adalah 3,8 mm/tahun. Penurunan muka tanah rata-rata Kecamatan Wiradesa, Kecamatan Tirto, Kecamatan Siwalan dan Kecamatan Wonokerto adalah 20,27 cm/tahun, 20,58 cm/tahun, 21,63 cm/tahun dan 23,49 cm/ tahun. Luas daerah yang tergenang banjir rob pada bulan November 2020 adalah 783,99 hektar, tetapi dengan adanya tanggul menjadi 1,68 hektar.

Karakteristik Upwelling pada Periode Indian Ocean Dipole (IOD) Positif di Perairan Selatan Jawa Barat Dini Oktaviani; Gentur Handoyo; Muhammad Helmi; Kunarso Kunarso; Anindya Wirasatriya
Indonesian Journal of Oceanography Vol 3, No 4 (2021): Indonesian Journal of Oceanography
Publisher : University of Diponegoro

Indian Ocean Dipole (IOD) merupakan suatu pola variabilitas di Samudera Hindia dengan perubahan Suhu Permukaan Laut (SPL) yang lebih rendah daripada biasanya. Secara umum perubahan variabilitas suhu permukaan laut dan persebaran klorofil-a di laut sangat dipengaruhi oleh adanya fenomena Indian Ocean Dipole (IOD). Adanya fenomena IOD ini berpengaruh pada terjadinya upwelling pada perairan selatan Jawa Barat.Tujuan dari penelitian ini adalah untuk mengetahui karakteristik dan hubungan Indian Ocean Dipole (IOD) dengan upwelling di perairan selatan Provinsi Jawa Barat. Metode yang digunakan yaitu metode kuantitatif, metode ilmiah yang dianalisis menggunakan kaidah-kaidah ilmiah yang empiris, rasional dan sistematis. Penelitian ini dilakukan menggunakan data satelit tahun 2008 sampai dengan 2017 . Materi yang digunakan dalam penelitian ini adalah data Suhu Permukaan Laut (SPL) dan klorofil-a hasil perekaman satelit Aqua MODIS, data Dipole Mode Index (DMI). Data dari satelit diolah menggunakan SeaDas kemudian menggunakan software ArcGIS. Setelah data didapatkan kemudian diolah menggunakan Microsoft Excel. Hasil penelitian menunjukkan bahwa variabilitas IOD mempengaruhi karakteristik upwelling yang terjadi di perairan selatan Jawa Barat. Ketika nilai DMI meningkat maka upwelling menguat yang ditunjukkan indikator SPL menurun dan klorofil-a meningkat. Sebaliknya ketika DMI menurun maka upwelling akan menurun yang ditunjukkan indikator SPL meningkat dan klorofil-a menurun. Upwelling dengan katagori lemah sudah mulai terjadi bulan Mei. Upwelling medium terjadi bulan Juni-Juli dan upwelling kuat umunya terjadi pada bulan Agustus-September.Bulan Oktober-November umumnya upwelling melemah lagi.

Distribusi Material Padatan Tersuspensi di Perairan Semarang dengan Penginderaan Jauh Adzkia Pincta Milenia; Anindya Wirasatriya; Lilik Maslukah; Muh Yusuf; Muhammad Helmi
Indonesian Journal of Oceanography Vol 3, No 3 (2021): Indonesian Journal of Oceanography
Publisher : University of Diponegoro

Muara sungai Banjir Kanal Barat merupakan tempat pertemuan antara sungai dan wilayah pesisir, dimana sungai Banjir Kanal Barat berpotensi sebagai media pembawa limbah, mulai dari limbah rumah tangga, hingga kegiatan-kegiatan industri. Limbah tersebut menyebabkan perairan sekitar menjadi keruh yang berkaitan pada peningkatan sedimen tersuspensi di daerah tersebut. Pendekatan citra penginderaan jauh merupakan alternatif untuk mengetahui sebaran material padatan tersuspensi (MPT). Tujuan penelitian ini adalah menganalisis nilai sebaran MPT di muara Banjir Kanal Barat Semarang. Penelitian ini dilakukan pada tanggal 11 Agustus 2020 di muara Sungai Banjir Kanal Barat, Kota Semarang. Pengambilan sampel MPT di lapangan dilakukan pada 100 stasiun dengan kedalaman 1 meter. Data MPT dan reflectance remote sensing (Rrs) diperoleh dari situs sentinel copernicus rekaman pada tanggal 11 Agustus 2020 yang merupakan data citra satelit Sentinel-2 dengan resolusi 10 m. Data citra satelit Sentinel-2 diolah dengan pendekatan algoritma Syarif Budhiman (2004). Hasil menunjukkan bahwa konsentrasi MPT hasil observasi lapangan didapat rentang nilai antara 32,72 – 75,46 mg/L, sedangkan berdasarkan analisis MPT dengan citra satelit sebesar 22,51 – 35,48 mg/L. Nilai akurasi bias parameter MPT sebesar -20,43. Nilai RMSE parameter MPT sebesar 21,53.

Study of Sensitivity Index for Landslide Disaster in Gunungpati Sub-district, Semarang City Mahendra Ken Pambayun; Muhammad Helmi; Fuad Muhammad
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 21, No 1 (2024): March 2024
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v21i1.276-289

Sensitivity is one of the parameters of the vulnerability in a disaster. Gunungpati Sub-district is one of the sub-districts that had a high-intensity landslide in Semarang city. Assessment of the sensitivity index to disasters is necessary to reduce vulnerabilities and to become a consideration for policy-taking factors in the emergence of disasters. The sensitivity index uses the population density, building density, sex ratio, dependency ratio, poverty rate, and education level. The method used is a weighted scoring method for each sensitivity variable. The sensitivity index of the Gunungpati Sub-district on landslide ranges from 2.6 - 2.8. Sensitivity levels of the Gunungpati Sub-district are classified into three classes there are little sensitive, moderately sensitive, and sensitive classes. Five villages have high sensitivity values. Special attention from the government is needed to increase the capacity of the population in terms of social and economic aspects to reduce the high sensitivity value in the area. Mitigation that can be done by the government related to the sensitivity of this area can be through policies such as capital assistance and training for vulnerable groups, equalization of employment, making policies, and strict control of development permits in areas at risk of landslides.

Dynamics of mangrove species dominant area changes in Timbulsloko and Bedono, Demak Zahra Safira Aulia; Rudhi Pribadi; Muhammad Helmi
Depik Vol 12, No 2 (2023): AUGUST 2023
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.12.2.32538

Mangrove forests in Timbulsloko and Bedono villages have very important benefits in minimizing abrasion, due to tidal flooding and land absorption in this area. A large number of people have planted mangroves to restore the function of mangrove forests in coastal areas which conducted by NGOs, students, government agencies, and awareness from local residents. This study aimed to determine the dynamics of mangrove area and mangrove species dominant area changes in 2016, 2018, 2020 and 2022 based on Sentinel-2 Satellite Imagery processing, and to analyze the dynamic changes based on geospatial analysis. The method used in this study is divided into two: satellite imagery data processing and field survey. The result showed that the area of mangrove species in Timbulsloko and Bedono increased from 2016 to 2022. In 2016 the area of mangroves was 140.04 ha, 159.57 ha in 2018, 171.05 ha in 2020, and 234.8 ha in 2022. The use of Sentinel 2 Satellite Imagery to map the distribution of mangrove species dominant produce overall accuracy of 84.62%. The mangrove species with the highest area are Avicennia marina followed by Avicennia alba, Rhizophora apiculata, and Rhizophora mucronate. The increase in this area of mangroves in this area is due to natural additions and artificial additions due to mangrove planting conservation by several parties and the awareness of the local residents to protect mangroves.Keywords:Mangrove SpeciesDynamicsCoastal AreaSentinel 2Remote Sensing

Prediksi Muka Air Tanah Perkotaan Menggunakan Hybrid ANFIS-PSO: Studi Kasus Kota Semarang Oasiska Nuhannaning Suharyanto; Muhammad Helmi; Jafron Wasiq Hidayat
Jurnal Ilmu Lingkungan Vol 23, No 5 (2025): September 2025
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.23.5.1394-1403

Prediksi muka air tanah merupakan hal krusial untuk perencanaan pengelolaan sumber daya air tanah yang berkelanjutan, khususnya di daerah urban seperti Kota Semarang yang rentan terhadap penurunan muka air tanah. Penelitian ini bertujuan mengembangkan model prediksi MAT satu bulan ke depan dengan mengoptimalkan algoritma Adaptive Neuro-Fuzzy Inference System (ANFIS) menggunakan Particle Swarm Optimization (PSO). Data sekunder dari ESDM Jawa Tengah periode Juni 2019 hingga Agustus 2024 dari tujuh sumur pantau dianalisis dengan variabel input muka air tanah bulan sebelumnya (GWL t-1), curah hujan, evapotranspirasi, dan temperatur. Evaluasi kinerja model menggunakan koefisien determinasi (R²) dan Root Mean Square Error (RMSE). Hasilnya menunjukkan akurasi yang bervariasi antar lokasi, dengan R² tertinggi 92,77% (RMSE 19,62%) di SMKN 1 Semarang dan R² terendah 62,71% (RMSE 16,27%) di PT Savana Tirta Makmur. Variasi akurasi ini diduga kuat dipengaruhi oleh karakteristik akuifer dan kondisi lingkungan setempat yang tidak seragam. Secara keseluruhan, model ANFIS-PSO terbukti robust dalam memprediksi fluktuasi muka air tanah non-linier. Model ini dapat dijadikan sebagai alat pendukung keputusan yang berharga bagi para pemangku kebijakan, misalnya untuk memitigasi risiko overdraft air tanah dan menyusun strategi konservasi yang lebih efektif di Kota Semarang.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.12.2.32538

SPATIO-TEMPORAL DYNAMICS OF MANGROVE COVER 1985-2025 BASED ON GEOSPATIAL ANALYSIS IN REMBANG Sabna Suryaningtias; Jafron Wasiq Hidayat; Muhammad Helmi
Multidiciplinary Output Research For Actual and International Issue (MORFAI) Vol. 6 No. 3 (2026): Multidiciplinary Output Research For Actual and International Issue
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.19081075

Mangroves are coastal vegetation that lives in tidal zones, providing ecosystem services such as biota habitats, abrasion barriers, breakbreaks, and significant carbon sequestration for climate change mitigation. However, the mangrove ecosystem in Indonesia, including in Rembang District, which includes Pasarbanggi, Tireman, and Kabongan Lor Villages, has been degraded due to land conversion into ponds, logging, and reclamation. This study aims to analyze the spatio-temporal dynamics of mangrove cover in 1985-2025 in Rembang District using MVI based on Landsat 5 (1985, 1995), Landsat 7 (2005), and Sentinel-2A (2016, 2025) satellite imagery. The analysis was carried out with a composite of NIR, Green, and SWIR Bands, digitization, cropping, cover classification, and analysis of mangrove cover changes. The results of the study show that the area of mangrove cover has experienced very significant fluctuations. The period 1985–2005 was dominated by heavy degradation (-67.93%), while the period 2005–2025 recorded a very strong recovery of mangrove ecosystems (+339.56%), with the high cover class increasing from 17.39 ha to 27.40 ha. The success of rehabilitation and reduced land conversion have succeeded in restoring the area of mangrove forests while improving the quality of mangroves in Rembang District. Keywords: Spatio-temporal dynamics, Rembang, Mangrove, MVI, Remote Sensing

ENVIRONMENTAL IMPACT ASSESSMENT IN HYDROPOWER GENERATION: A LIFE CYCLE ASSESSMENT AT PT PLN NUSANTARA POWER UP CIRATA, PURWAKARTA, INDONESIA Rimala Zahra Wibowo; Suherman; Muhammad Helmi; Arti Hapsari
Multidiciplinary Output Research For Actual and International Issue (MORFAI) Vol. 6 No. 3 (2026): Multidiciplinary Output Research For Actual and International Issue
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.19080911

PT PLN Nusantara Power UP Cirata is one of the largest hydropower plants in Indonesia, with an installed capacity of 1.008 MW, and plays a strategic role in supporting national electricity supply security. Although classified as renewable energy, hydropower operations are not entirely free from environmental impacts, including greenhouse gas emissions from biomass decomposition in the reservoir and waste generated from turbine and generator maintenance. This study aims to analyze the environmental impacts of electricity generation using the Life Cycle Assessment method with a cradle-to-gate system boundary. The assessment was conducted using SimaPro 9.5.0.2 with the CML-IA Baseline method, where the functional unit was 1 kWh of electricity. The main hotspot within the cradle boundary is the Cirata Reservoir due to diesel consumption, contributing 1.21E-04 kg CO2-eq/kWh to global warming potential, 2.35E-11 kg CFC-11-eq/kWh to ozone depletion potential, 3.52E-07 kg SO2-eq/kWh to acidification potential, and 3.32E-06 kg PO4-eq/kWh to eutrophication potential. Within the gate boundary, hotspots were identified in the turbine, where used oil contributed 1.91E-05 kg CO2-eq/kWh to global warming potential, turbine oil contributed 2.63E-12 kg CFC-11-eq/kWh to ozone depletion and 3.97E-08 kg SO2-eq/kWh to acidification potential, and the sewage treatment plant contributed 3.49E-07 kg PO4-eq/kWh to eutrophication potential.

Study of the Development Potential of Geospatial-Based PSEL (Waste Processing into Electrical Energy) Areas Hani Kartika Hariyanto; Rina Kurniati; Muhammad Helmi
Jurnal Impresi Indonesia Vol. 3 No. 3 (2024): Jurnal Impresi Indonesia
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jii.v3i3.4764

Since 1989, most of the waste processing in DKI Jakarta Province has ended at the Bantar Gebang TPST, causing the available capacity to accommodate waste to approach the maximum limit. One alternative processing that has a high level of efficiency in reducing the volume of waste is the PSEL (Waste to Electrical Energy Management) facility. Planning PSEL facilities in urban areas requires consideration from all aspects. While the space utilization in DKI Jakarta is quite dense and there are no practical guidelines in determining the location of PSEL facilities, it is necessary to conduct a comprehensive study, namely a study of the potential development of PSEL areas. The purpose of this study is to obtain the location and spatial pattern of the potential development of the PSEL area and obtain the characteristics of the area with the 'Recommended' category as the location of PSEL facility development. This study uses geospatial analysis with the quantitative Weighted Overlay method, where geospatial modeling is carried out by inputting the weight of each criterion (aspects that have an influence on determining the location of PSEL facilities) obtained from the results of the Fuzzy Analytic Hierarchy Process (FAHP) analysis assisted by a questionnaire tool. The results of the study obtained 2 (two) areas that have High Category status with a total area of 1.52 ha located in Cilincing District and Kelapa Gading District, North Jakarta with the condition that the first area occupies an improper designation zone (Industrial and Warehousing Zone) while the second area has a radius distance of less than 500 m to the nearest settlement and tourist location.

Co-Authors Ade Firdaus Triagusta Aditya Dwi Nugroho Adzkia Pincta Milenia Agus Hartoko Alfi Satriadi Andri Ramdhani Andy Ahmad Romadhoni Anindya Wirasatriya Aris Ismanto Arti Hapsari Azis Nur Bambang Azis Rifai Baskoro Rochaddi Daffa Dinan Ihsani El-Fath Denny Nugroho Sugianto Dini Oktaviani Faisal Aldin Faiz Hamzah Adriono Fuad Muhammad Fuji Anida Geby Ayunda Gentur Handoyo Hadiwijaya L. Salim Hanah Khoirunnisa Hani Kartika Hariyanto Hariyadi Hariyadi Heryoso Setiyono Ibnu Pratikto Indra Budi Prasetyawan Jafron Wasiq Hidayat Jafron Wasiq Hidayat Jusup Supriijanto Kunarso Kunarso Lilik Maslukah Louis Jannahtuna'im Koes Miranda Mahendra Ken Pambayun Maria Griselda Novita Muh Yusuf Muh Yusuf Muhammad Najib Habibie Muhammad Zainuri Muslim Muslim Nasir Sudirman Nining Sari Ningsih Nugroho Agus D Nurfatin Adibah Oasiska Nuhannaning Suharyanto Petrus Subardjo Prayogi Prayogi Purwanto Purwanto Rafa Fahrezi Tagore Rahayu Sapta S. Sudewi Rikha Widiaratih Rikoh Manogar Siringoringo Rimala Zahra Wibowo Rina Kurniati Roni Kurniawan Rudhi Pribadi S. Suripin Sabna Suryaningtias Shafira Tsanyfadhila Siswanto Siswanto Sugeng Widada Suharsono Suharsono Suherman Surya Nugraha Syaiful Syafrei Adi Iskandar Syafrudin Syafrudin Tri Abdul Hidayat Warsito Atmodjo Yuari Susanti Yudo Prasetyo Zahra Safira Aulia

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