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All Journal Jurnal Ilmiah MITSU (Media Informasi Teknik Sipil Universitas Wiraraja) Journal of Advanced Civil and Environmental Engineering JTT (Jurnal Teknologi Terpadu) Journal of Marine-Earth Science and Technology Jurnal Impresi Indonesia Journal of Social Research Aceh International Journal of Science and Technology
Maulana, Mahendra Andiek
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Pengembangan Alat Ukur Hidrometri Berbasis 5 Jenis Sensor Untuk Deteksi Konsentrasi Sedimen Dalam Upaya Mitigasi Bencana Banjir Sungai Bomo Erwanto, Zulis; Iranata, Data; Maulana, Mahendra Andiek; Sasmita, Ginanjar Eka; Handoko, Siswo; Habibi, Hida Jaya; Hasyim, Nur Cholik
Jurnal Teknologi Terpadu Vol 12, No 1 (2024): JTT (Jurnal Teknologi Terpadu)
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/jtt.v12i1.1914

Abstract

Peristiwa banjir pada DAS bertipe bulu burung di Banyuwangi dapat membawa dampak tingginya angkutan sedimen dan menurunnya kualitas air. Peluapan sungai Bomo dipacu karena intensitas hujan dan kecepatan aliran tinggi sehingga berdampak erosi, degradasi, dan kekeruhan yang tinggi. Tujuan penelitian untuk pengembangan alat ukur hidrometri berbasis sensor untuk deteksi konsentrasi sedimen dalam upaya mitigasi bencana banjir di Sungai Bomo. Tahapan penelitian melalui proses rancang bangun alat ukur hidrometri berbasis sensor berupa sensor ultrasonic (water level), water flow, turbidity, TDS, dan suhu, lalu simulasi pengukuran, dan pengambilan sampel sedimen untuk diuji karakteristik fisik di laboratorium berupa uji konsentrasi sedimen, berat jenis, berat volume, analisa saringan dan hidrometer. Parameter hidrometri diuji statistik melalui sediment-discharge rating curve. Hasil pengujian karakteristik fisik sedimen sungai Bomo selama 7 hari masing-masing di bulan basah dan kering diperoleh nilai rata-rata Cu 3,88 – 6,58 dan nilai rata-rata Cc 0,62 – 1,19, berat jenis rata-rata 2,5 – 2,55 dan berat volume 1,49 – 1,57 gr/cm3. Kalibrasi pembacaan sensor TDS terhadap konsentrasi sedimen dengan nilai MAE rata-rata sebesar 0,23 reliable terhadap kondisi lapangan. Hasil sediment-discharge rating curve pada musim kering diperoleh persamaan Qs_dry=35.653.(Qw)^0.9315 (R2 = 0.8269). Pada musim basah diperoleh persamaan Qs_wet=16.501.(Qw )^1.3719  (R2= 0.9336). Pada saat musim kering perlu waspada karena lahan lebih erosif karena nilai a > 26 yaitu 35.653 yang mengindikasikan laju erosi tinggi dan dapat menyebabkan banjir dan longsor. Alat ukur hidrometri berbasis sensor layak dikembangkan sebagai alat deteksi konsentrasi sedimen sebagai indikator muatan sedimen dalam upaya mitigasi bencana banjir dan tindakan konservasi lahan.
Assessment and Prediction of Hydrometeorological Drought in Corong River Basin, Indonesia Affandy*, Nur Azizah; Iranata, Data; Anwar, Nadjadji; Maulana, Mahendra Andiek; Prastyo, Dedy Dwi; Yusop, Zulkifli; Wardoyo, Wasis
Aceh International Journal of Science and Technology Vol 12, No 3 (2023): December 2023
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.12.3.32592

Abstract

Hydrological drought analysis in a river basin is crucial because it impacts water resource management, agriculture, drinking water supply, industry, ecology, and disaster risk mitigation. It plays a key role in water usage planning, safeguarding agricultural yields, and ensuring a stable drinking water supply. In the context of this research, the Corong River basin is used as a case study. This study aims to determine the level of hydrological drought (deficit) using the Threshold Level Method (TLM) and predict hydrological drought using the Seasonal Autoregressive Integrated Moving Average (SARIMA) model. This model understands the characteristics of drought and predicts drought in the Corong River basin for early mitigation and anticipation of drought in the region. The results of this research indicate a strong relationship between the Hydrological Drought Index (HDI) and streamflow and Precipitation (PRCP), which can be used to forecast future droughts. This model is highly robust and accurate in observing the level of hydrological drought (deficit, duration, and sharpness) and predicting drought events in the Corong River basin. These findings have significant practical implications for water management and disaster risk mitigation in this river basin while also advancing the scientific understanding of hydrological drought.
PENGARUH PERUBAHAN TATA GUNA LAHAN TERHADAP NILAI CURVE NUMBER PADA DAS SAROKAH Zainah, Nor; Maulana, Mahendra Andiek; Margini, Nastasia Festy
Jurnal Ilmiah MITSU (Media Informasi Teknik Sipil Universitas Wiraraja) Vol 12 No 2 (2024): Jurnal Ilmiah MITSU
Publisher : Fakultas Teknik, Universitas Wiraraja

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24929/ft.v12i2.3612

Abstract

Changes in land use in a watershed can significantly affect its hydrological characteristics. In addition to extreme rainfall events, land-use changes are among the factors contributing to flooding. This study aimed to determine changes in CN values due to land use changes in the Sarokah Watershed. Land use analysis was conducted by training objects on satellite image data acquired by Landsat 7, Landsat 8, and Sentinel 2A. From 2002 to 2013, there was a 9.03% decrease in the area of paddy fields and a 5.83% increase in the area of farms in the Sarokah Watershed. From 2013 to 2023, there was a 3.16% increase in built-up area and a 5.26% decrease in the area of paddy fields. According to the district's spatial plan, from 2023 to 2042, there will be a 29.15% increase in the built-up area and a 19.69% increase in the area of paddy fields. However, forest/tree areas and farm areas will decrease by 17.36% and 23.96%, respectively. Based on the 2023-2043 land use changes, the highest increases in CN values in 2043 will be in Sub-watersheds S15, S6, and S14 at 16.5%, 13.2%, and 10.8%, respectively.
Analisis Penurunan Tinggi Muka Air Sungai Rejoso di Kabupaten Pasuruan dengan Normalisasi Sungai Syamsuddin, Mohammad Dimas Noor; Maulana, Mahendra Andiek
Jurnal Impresi Indonesia Vol. 4 No. 7 (2025): Jurnal Impresi Indonesia
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jii.v4i7.6880

Abstract

Sungai Rejoso di Kabupaten Pasuruan mengalami permasalahan banjir yang disebabkan oleh kapasitas penampang yang tidak mampu menampung debit banjir rencana. Penelitian ini bertujuan untuk menganalisis kondisi hidrologi DAS Rejoso, mengevaluasi kapasitas eksisting sungai, dan mengkaji efektivitas normalisasi sungai dalam mengurangi tinggi muka air banjir. Metode penelitian menggunakan analisis hidrologi dengan data curah hujan 10 stasiun selama periode 2014-2023, pemodelan debit banjir menggunakan HEC-HMS, dan analisis hidraulik menggunakan HEC-RAS. DAS Rejoso memiliki luas ± 361,2 km² yang meliputi 10 kecamatan. Analisis hidrologi menggunakan distribusi Log Pearson III menghasilkan debit banjir rancangan kala ulang 25 tahun sebesar 145,5 m³/dt. Hasil pemodelan HEC-RAS menunjukkan kondisi eksisting sungai tidak mampu menampung debit rancangan dengan tinggi genangan rata-rata 1,207 meter, 408 titik tanggul kanan meluap, dan 321 titik tanggul kiri meluap. Skenario normalisasi sungai berhasil mengurangi tinggi genangan menjadi 0,722 meter dengan 237 titik tanggul kanan meluap dan 148 titik tanggul kiri meluap, memberikan reduksi tinggi muka air sebesar 40,174% terhadap kondisi eksisting. Hasil penelitian ini memberikan implikasi penting bagi pemerintah daerah dalam merencanakan normalisasi sungai sebagai solusi teknis pengendalian banjir berbasis data. Temuan studi menunjukkan perlunya mengintegrasikan normalisasi dengan pembangunan tanggul dan kolam retensi di titik-titik rawan luapan untuk hasil yang lebih optimal. Selain itu, diperlukan program pemantauan dan pemeliharaan berkala untuk mencegah sedimentasi pasca-normalisasi guna memastikan keberlanjutan intervensi yang dilakukan. Normalisasi sungai terbukti efektif dalam mengendalikan banjir di Sungai Rejoso meskipun masih terdapat luapan pada beberapa ruas.
HYDRAULIC MODELING STUDY OF ALTERNATIVE FLOOD CONTROL STRATEGIES FOR THE REJOSO RIVER PASURUAN Syamsuddin, Mohammad Dimas Noor; Maulana, Mahendra Andiek
Journal of Marine-Earth Science and Technology Vol. 6 No. 1 (2025): April
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

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

Abstract

Rejoso River is administratively included in Pasuruan Regency where its watershed is located in 10 sub-districts (Puspo, Tosari, Gondang Wetan, Rejoso, Winongan, Pasrepan, Grati Districts of Pasuruan Regency and Lumbang, Sukapura, Probolinggo Regency). The area of the Rejoso River watershed is ± 361.2 km2, bordered by hillsides and protected forests. In general, the cause of flooding in the Rejoso River watershed is caused by high intensity rainfall and changes in land use such as the Rejoso River, especially in the upstream area. The flat topography of the downstream area causes potential sedimentation which inhibits the flow (run off). The purpose of this study is to determine the condition of the existing system and capacity of the Rejoso River; to determine the influence of land use, and to provide alternative scenarios for the most effective flood control to reduce the flood water level or collect the flood that occurs. In this study, hydrological and hydraulic modeling was carried out. The method that used in the calculation of flood discharge is HEC-HMS, while for hydraulic analysis the HEC-RAS 1D is used with the results of water level at the river cross section. This analysis aims to determine the most effective flood control scenario for reducing flooding that occurs in the Rejoso River. The results of this study are alternative flood control scenarios for the Rejoso River by carrying out normalization, embankment’s structure and retention ponds which are the best scenarios for reducing high flood water levels. This can be shown by a decrease of average height of the flood water level from 1.207 meters to 0.435 meters. With these conditions, it can be concluded that this scenario is the best scenario for reducing the high flood overflow in the Rejoso River.
PATTERN OF METEOROLOGICAL DROUGHT DISTRIBUTION IN THE SLAHUNG RIVER BASIN, PONOROGO, USING THE THEORY OF RUN METHOD T, Thoif; Affandy, Nur Azizah; Nabilah, Salwa; Kartikasari, Dwi; Maulana, Mahendra Andiek
Journal of Marine-Earth Science and Technology Vol. 5 No. 3 (2024): December
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j27745449.v5i3.4023

Abstract

Drought is a natural event that frequently occurs in Indonesia and significantly impacts various sectors, such as agriculture, plantations, and water resources. This study aims to analyze the level of drought in the Slahung sub-River basin using the Theory of Run method. The data used includes 24 years of rainfall data from three rainfall stations: Ngilo-Ilo, Balong, and Slahung, covering the period from 2000 to 2023. The analysis results show that the longest drought duration at Slahung Station occurred in 2012, lasting 18 months, with the largest cumulative drought recorded in 2010 at -1071 mm. The drought distribution map reveals that 2019 was the driest year, while 2023 was the wettest. This study provides valuable insights into water resource management and drought disaster mitigation planning in the Slahung sub-River basin. Future research is recommended to use longer and higher-quality data, as well as comparisons with other drought analysis methods to improve the accuracy of the analysis.
INFILTRATION CAPACITY DERIVATIVES AND SOIL MOISTURE EQUATION MODEL VALIDATION Kencanawati, Martheana; Iranata, Data; Maulana, Mahendra Andiek; Damarnegara, A. A. Ngurah Satria
Journal of Marine-Earth Science and Technology Vol. 5 No. 3 (2024): December
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j27745449.v5i3.4183

Abstract

Infiltration is an essential parameter in runoff, although its simulation remains challenging due to soil heterogeneity and complex structures. As soil moisture increases, infiltration capacity decreases nonlinearly, stabilizing when saturation is reached. Therefore, this study aimed to improve and validate the Horton Equation using field observations to determine infiltration capacity in watersheds. Overland flow observations were used to assess simulation accuracy from the previous studies, the sensitivity curve number was obtained at a range of 49–57. The results showed that high precipitation saturated initial losses and infiltration capacity, producing a greater runoff coefficient. The sensitivity curve numbers were obtained differently between Pandantoyo sub-basin (CN 49–53) and Ngadirejo sub-basin (CN 53–55). From modification runoff coefficient values (dimensionless,) for an ungauged catchment, it could be obtained function of f (R24, Sm), LU. Soil moisture value between Pandantoyo and Ngadirejo sub-basin was 3,562. It was also discovered that C was Q from AWLR observation and time of concentration, which influenced water discharge. A longer Tc led to lower discharge without increasing water levels. Furthermore, SCS Direct runoff method had minimal impact on runoff coefficients.
Evaluation of the Jlantah Dam Inflowing Area as a Reference af Efficiency Towards Implementation Time and Cost Sunawilalodra, Gaga; Maulana, Mahendra Andiek; Rohman, Arif
Journal of Social Research Vol. 2 No. 8 (2023): Journal of Social Research
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/josr.v2i8.1322

Abstract

Jlantah Dam is located on the Jlantah River, Karanganyar Regency, Central Java Province. The construction of the Jlantah dam serves irrigation needs, raw water supply, flood reduction, and tourism. In the implementation of the construction, there are problems with land acquisition in the reservoir inundation area. This problem will affect the time and cost of implementing the construction of the Jlantah Dam. Therefore, it is necessary to carry out a simulation to determine the optimum reservoir volume of the reservoir that can fulfill the benefits of the dam, the implementation of which is not hampered by land acquisition in the inundation area and is efficient in terms of time and cost of implementation. In determining the inundation area of the reservoir, a capacity curve based on the topographic map is used to determine the area and volume of the reservoir at each elevation, then a simulation is performed to calculate at what elevation the reservoir can fulfill its planned utilization. The simulation was carried out with 2 (two) alternative conditions, namely the conditions at the crest elevation + 685 and the crest elevation + 682. From these two alternatives, it can be seen the reliability of the reservoir for each condition. The results of the evaluation obtained from the two mercury elevations have the greatest benefit value at + 685 elevations with a reservoir reliability value of 97.22%, a BCR value of 1.218, and an IRR value of 5.88% with a total cost of Rp. 1,750,818,179,096.
Performance and Durability of High-Volume Fly Ash Concrete Incorporating Bacillus safensis : A Comparative Study of Class C and Class F Fly Ash Amini, Iqlima Nuril; Syah, Dzikrie Fikriyan; Setiamarga, Davin H. Ekaputra; Basoeki, Makno; Danardi, Luki; Laory, Irwanda; Anda, Martin; Maulana, Mahendra Andiek; Wulandari, Meity; Ekaputri, Januarti Jaya
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 8, No 2 (2025): October
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.8.2.8-21

Abstract

This study investigates the performance and durability of high-volume fly ash (HVFA) concrete enriched with Bacillus safensis, focusing on the comparative influence of Class C and Class F fly ash. Concrete mixtures were prepared with varying proportions of both fly ash types, with and without microbial addition, and tested for fresh and hardened properties including compressive strength, splitting tensile strength, porosity, and workability. Durability was further evaluated using the rapid chloride penetration test (RCPT) and accelerated corrosion test (ACT).Results showed that Class C fly ash, with its higher calcium content, produced a denser microstructure and improved early compressive strength. In contrast, Class F fly ash supported more favorable long-term microbial activity due to greater porosity and water availability. Incorporating Bacillus safensis enhanced compressive strength by up to 8% and significantly reduced chloride ion penetration, particularly in Class F fly ash concrete, through calcium carbonate precipitation within the pores. However, microbial addition was associated with reduced splitting tensile strength, likely due to differences in failure mechanisms. Long-term observations revealed strength gains of up to 13.3% after one year in microbial HVFA concrete.These findings demonstrate the synergistic contribution of Bacillus safensis and the effect of fly ash type to the improvement of sustainability and durability of HVFA concrete.
Co-Authors Affandy*, Nur Azizah Amini, Iqlima Nuril Anda, Martin Arif Rohman Basoeki, Makno Damarnegara, A. A. Ngurah Satria Danardi, Luki Data Iranata Dedy Dwi Prastyo Dwi Kartikasari Habibi, Hida Jaya Handoko, Siswo Hasyim, Nur Cholik Januarti Jaya Ekaputri Kencanawati, Martheana Laory, Irwanda Margini, Nastasia Festy Nabilah, Salwa Nadjadji Anwar Sasmita, Ginanjar Eka Setiamarga, Davin H. Ekaputra Sunawilalodra, Gaga Syah, Dzikrie Fikriyan Syamsuddin, Mohammad Dimas Noor T, Thoif Wardoyo, Wasis Wulandari, Meity Yusop, Zulkifli Zainah, Nor Zulis Erwanto