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Barry Yusuf Labdul
Universitas Negeri Gorontalo
Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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ANALISIS POLA DISTRIBUSI DAN INTENSITAS CURAH HUJAN DI DAS BOLANGO BONE Meldiana Karim; Barry Yusuf Labdul; Rawiyah Husnan
Composite Journal Vol. 1 No. 1 (2021): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (640.457 KB) | DOI: 10.37905/cj.v1i1.7

Abstract

Heavy precipitation is among the causes of flooding. Bone Bolango is one of the flooding areas in Gorontalo. Since the parameters determining the discharge of the flood is precipitation, an analysis method for determining the distribution pattern and precipitation that fits the situation in the watershed area of Bolango Bone is required. Thereby, the present study aimed at analyzing the distribution pattern and the precipitation in the area. The analysis methods of rainfall distribution were the normal, log-normal, log Pearson type III, and Gumbel methods. In addition, the precipitation was examined using Talbot method, Sherman method, and Ishiguro method. The data consisted of daily precipitation data (the data from the last 10 years at minimum) from Alale station, Boidu, Longalo, Dulamayo Selatan, and Sogitia Permata. According to the results of parameter statistical analysis, the value of Cs, Cv, and Ck of the precipitation in 5 stations did not meet the requirements for normal distribution, log-normal, and Gumbel. The Cv value of Alale station, Boidu station, Longalo station, Dulamayo Selatan station, and Sogitia station is 0.3, 0.32, 0.19, 0.23, and 0.28, respectively. The Cs value of those stations, in consecutive order, is 3.45, 2.21, 1.33, 0.92, and 1.11, and the Ck value is 18.58, 6.64, 4.55, 2.08, and 3.99. On that ground, the distribution pattern that best fits the watershed area of Bone Bolango us the Log Pearson III. Further, the most appropriate measurement of the precipitation in the area is the Sherman method. This method has the lowest standard deviation value at 67.3 mm and the best correlation value at 1. The heaviest rainfall occurred in the duration of 5 minutes and the return period of 100 years. The precipitation in Alale station, Boidu, Longalo, Dulamayo Selatan, and Sogitia is 378.15 mm/hr, 250.78 mm/hr, 188.98 mm/hr, 300.76 mm/hr, and 358.82 mm/hr, respectively.
OPTIMASI KOEFISIEN PARAMETER HIDROGRAF SATUAN SINTETIK ITB-1 DAN ITB-2 DI SUB DAS BIONGA KAYUBULAN Endrizal Rahman Iyan; Barry Yusuf Labdul; Rawiyah Husnan
Composite Journal Vol. 2 No. 1 (2022): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v2i1.28

Abstract

The reduction of the unit hydrograph from the observed flood hydrograph is an important factor in water construction planning. However, it is difficult to obtain observational flood hydrograph data in the form of AWRL (Automatic Water Level Recorder) and ARR (Automatic Rainfall Recorder) data. Hence, the hydrograph reduction known as synthetic unit hydrograph (SUH) is developed. One of the synthetic hydrographs developed in Indonesia is SUHof ITB-1 and ITB-2. Based on this rationale, this study aimed to analyze the SUH of ITB-1 and ITB-2 in the Bionga Kayubulan sub-watershed. The Straight Line Method was employed to separate the base flow from the run-off in order to obtain a direct run-off hydrograph. In analyzing the effective rain, the study utilized the Φ index equation. Further, the direct run-off and effective rain hydrograph were reduced to the observation unit hydrograph using the Collins method. Additionally, Microsoft Excel-Solver software was used to optimize the SUH of ITB-1 and ITB-2 coefficients on the hydrograph of the observation unit. The hydrograph of the observation unit in the Bionga Kayubulan sub-watershed attained 4.5 hours peak time (Tp) with 2.81 /s peak discharge (Qp). The ITB-1 synthetic hydrograph in the site area attained 5.97 hours peak time (Tp) with 1.96 /s peak discharge (Qp), while the ITB-2 synthetic hydrograph attained 5.97 hours peak time (Tp) with 2.45 /s peak discharge (Qp). The calibration results of ITB-1 synthetic unit hydrograph with changed coefficient parameters showed the time coefficient (Ct) of 0.73, the peak coefficient (Cp) of 1.07, and alpha (α) of 1.60. Further, for the SUH of ITB-2, the results showed a time coefficient (Ct) of 0.73, a peak coefficient (Cp) of 0.96, alpha (α) of 2.50, and beta (β) of 0.95.
PERENCANAAN PEMANENAN AIR HUJAN SEBAGAI ALTERNATIF PENYEDIAAN KEBUTUHAN AIR BERSIH (STUDI KASUS DESA PELEHU KEC. BILATO KAB. GORONTALO) Kamal Purnomo Miu Kamal Purnomo Miu; Rawiyah Husnan; Barry Yusuf Labdul
Composite Journal Vol. 2 No. 1 (2022): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v2i1.29

Abstract

Limited water resources in coastal areas is a problem often encountered, with high rainfall intensity being one of the most potent factors to solve it. Pelehu Village is one of regions located in Gorontalo District, a coastal area that was experiencing said problem. Rain intensity is one of the parameters used in calculating the discharge, in wich a proper analysis method based on Bubaa Drainage Basin at Paguayamn Pantai is necessary. The quality of the rainwater that will be used should also be qualified by the water characteristics based on the quality standards, in wich water samples to test the parameters of Chemistry, Physic, and Bacteriology are required. Rainwater harvesting installation system also requires planning and budget planning; therefore, this research aimed to analyze rainwater potential, water characteristics, and rainwater harvesting installation budget plan in Pelehu Village. The inhabitants’ needs for water were calculated based on the projected population growth from 2021 to 2025. Rainfall intesity was analyzed uaing Normal, Log-Normal, Log Pearson III, and Gumbel distributions, while the method used to analyze the rainfall intensity was Mononobe. The rainfall data were retrieved from Bubaa Drainage Basin at Paguyaman Beach for the last seven years. The tested characteristics of rainwater are mandatory Physical, mandatory Chemical, and Bacteriology parmeters based on the quality standard im Permenkes No. 32 of 2017. Budget plan was calculated based on the planning of rainwater harvesting instalation in Pelehu Village Office. The analysis of population growth from 2021 to 2025 is 833, 853, 874, 895, and 917 people, with 66.624, 68.247, 71.611, 73.355 liters/day of water needs amount. The value of Cv, Cs, and Ck of rainfall intensity analysis result of the statistical parameters were 0,84, 3, and 0,2, respectively; hence, the most compatible distribution pattern was the Log Pearson III. The highest precipitation intensity occured in five minutes for return periods of 100 years, wich was 197,75 mm/h. Water discharge was calculated with the rational method of 0,8420 m3/ sec ≈ 824,027 liters/sec. The rainwater potential in the village is 2966,4975 m3/h ≈ 2.966.498 liters/hour. The rainwater characteristics have met the quality standards for the parameters of Chemistry, Physics, and Bacteriology based of Permenkes No. 32, 2017. The budget plan of rainwater harvesting installation is Rp. 6.219.000 (Six Million Two Hundred Nineteen Thousand Rupiah).
ANALISIS DEBIT BANJIR DAN TINGGI MUKA AIR SUNGAI BONE TERHADAP ELEVASI DASAR JEMBATAN MOLINTOGUPO Aan Nurhandiat Kaharu; Rawiyah Husnan; Barry Yusuf Labdul
Composite Journal Vol. 2 No. 2 (2022): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v2i2.102

Abstract

Jembatan adalah struktur yang menghubungkan jalur lalu lintas yang terputus oleh sungai, danau, kanal, jalan, dan persimpangan lainnya. Dalam perencanaan jembatan faktor hidrolika harus diperhitungkan untuk menganalisis ruang bebas atau clearance. Penelitian ini bertujuan untuk menganalisis debit banjir dan tinggi muka air Sungai Bone terhadap elevasi dasar Jembatan Molintogupo. Lokasi penelitian berada di Jembatan Molintogupo. Data sekunder yang digunakan berupa data curah hujan, luas DAS Bolango-Bone, potongan melintang sungai, dan profil memanjang jembatan berupa panjang jembatan, lebar jembatan dan elevasi dasar jembatan. Metode analisis data antara lain analisis hidrologi untuk memperoleh debit banjir rencana serta analisis hidrolika yang dibantu dengan mengggunakan HEC-RAS 6.0 untuk memperoleh tinggi muka air banjir. Hasil analisis hidrologi diperoleh debit banjir rencana yang dihitung menggunakan metode Hidrograf Satuan Sintetik Nakayasu untuk Q25 sebesar 2567,13 m3/detik, Q50 sebesar 2943,97 m3/detik, dan Q100 sebesar 3356,85 m3/detik yang masing-masing terjadi pada jam ke 8. Hasil analisis hidrolika pada HEC-RAS 6.0 diperoleh elevasi tinggi muka air banjir kala ulang 50 dan 100 tahun di ruas Jembatan Molintogupo berada pada 35,08 m dan 35,54 m sedangkan dasar Jembatan Molintogupo berada pada elevasi 38,72 m, maka ruang bebas (C) masing-masing sebesar 3,64 m dam 3,18 m, sehingga jembatan tersebut aman terhadap banjir rencana dengan kala ulang 50 dan 100 tahun.
Perencanaan Sumur Resapan Air Hujan dalam Upaya Konservasi Daerah Pesisir Barry Yusuf Labdul; Aryati Alitu; Nur Atika Tambipi
Jurnal Teknik Vol 21 No 2 (2023): Jurnal Teknik
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v21i2.243

Abstract

Infiltration wells are engineered construction designed for water conservation to accomodate and absorb surface water. Water conservation in necessary to reduce seawater intrusion in coastal areas. Shallow groundwater in Pohe village, located in a coastal a rea, is affected by seawater intrusion. This research aiams to converse groundwater in the coastal area and to reduce rainwater runoff that flows into drainage channels as well as to reduce seawater intrusion. The research is conducted in a coastal area in Pohe Village that is directly adjacent to Tomini Bay. The data are in the form of infiltration rate and soil permeability as the primary data and in form of rainfall in tensity betweet 2019 and 2020 as the secondary data. Infiltration rate data are obtained by useing a Double Ring Infiltrometer and are analyzed using the Horton method. Fourthermore, soil permeability data are tested using the constant head test. Analysis of rainfall intensity uses the Mononobe method, whereas discharge analysis employs th Rational method. The dimension of infiltration wells uses Sunjoto 1988 method.Findings reveal that the infiltration rate (ft) at the research site is 3.89 cm/hour or 38,90 mm/hour which is classified as moderate criteria. The coefficient of soil permeability (k) is 0.07 cm/second. Rain intensity (I) obtains 38.94 mm/hour. According to the data, the area of Pohe Village (A) is 4.83 km2 and the flow coefficient (C) is 0.21. The discharge analysis (Q) is 10.86 m3/second. The dimension of the infiltration wells is planned to use a cylindrical shape with a diameter of (D) 1 m and a depth of (H) 58.90 m. The are 31 wells with a depth of 1.90 m.
Co-Authors Aan Nurhandiat Kaharu Aryati Alitu Endrizal Rahman Iyan Kamal Purnomo Miu Kamal Purnomo Miu Meldiana Karim Nur Atika Tambipi Rawiyah Husnan