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INDRIATI MARTHA PATUTI
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Composite Journal
Published by Universitas Negeri Gorontalo
ISSN : -     EISSN : 28075919     DOI : https://doi.org/10.37905/cj.v1i1.7
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
The journal aims to become an efficient means of publishing and distributing high-quality information from researchers, scientists, and engineers. The main scopes are as follows: Advances in Composite Materials, Computational Mechanics, Foundation and Retaining Walls, Slope Stability, Soil Dynamics, Soil-Structure Interaction, Pavement Technology, Tunnels and Anchors, Site Investigation and Rehabilitation, Ecology and Land Development, Water Resources Planning, Environmental Management, Earthquake and Tsunami Issues, Safety and Reliability, Geo-Hazard Mitigation, Case History and Practical Experience, Others
Arjuna Subject : Teknik (semua kategori) - Bangunan dan Konstruksi
Articles 5 Documents
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Search results for , issue "Vol. 3 No. 2 (2023): Composite Journal" : 5 Documents clear
TINJAUAN EFISIENSI SALURAN IRIGASI PADA JARINGAN UTAMA DAERAH IRIGASI LOMAYA Madjid, Muthmainna Abdul; Yusuf, Barry; Husnan, Rawiyah
Composite Journal Vol. 3 No. 2 (2023): 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.v3i2.45

Abstract

The primary problem in a region with limited water resources is the use of irrigation water and this limited water resource is associated with water volume losses in the irrigation channel, particularly in the primary, secondary, and tertiary channels through evapotranspiration, infiltration, and seepage. Therefore, the irrigation channel reguires effective and efficient management. The objective of this study is to evaluate the efficiency of Lomaya Irrigation Area to denote water use and to maximize the water use for agriculture. This study is conducted by applying field data in the primary channel of Lomaya Irrigation Area and data from the climatology of Bolango Bone Tumbihe Watershed. The data collected are a wet cross-sectional area of channel and flow speed in several vertical points. The average daily evaporation rate and water losses in the primary channel of Lomaya Irrigation Area are determined by employing Penman evaporation method. In addition, the efficiency value is obtained by comparing inflow and outflow debit in the irrigation channel. The result of water losses value analysis in the Lodelombongo irrigation channel due to evaporation is 5,14 m³/sec, and the value is not too influential for the water losses in the channel compared to the water losses due to leakage in the channel. In the meantime, the average efficiency value in the Lodelombongo irrigation channel is 61%, where it is no longer in compliance with the predetermined provision in the irrigation planning criteria. The greatest efficiency value in primary channel BLI-BL2 is 92,42%, whereas the smallest value in the primary channel BL3-BL.BI is 49,35Y%, the greatest efficiency value in secondary channel BL.B3-BL.B4 is 72,64%, whereas the smallest value in the secondary channel BL.BS-BL.B6 is 43,89%. The efficiency value is affected by water volume, which losses on its way where the water losses in the irrigation channel encompass water losses components through evapotranspiration, percolation, seepage, and leakage.
EVALUASI KERAPATAN JARINGAN STASIUN HUJAN DI DAS BOLANGO BONE Laude, Evita Verent; Labdul, Barry Yusuf; Husnan, Rawiyah
Composite Journal Vol. 3 No. 2 (2023): 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.v3i2.49

Abstract

The location and number of rain stations in a watershed area are the main components in ensuring the availability of rainfall data. Evaluation of the rain station network density is needed to determine the condition of the distribution of rain stations and new rain stations recommendation. The research was conducted in the Bolango Bone watershed with 10 existing rain stations. Rainfall observation data in 7 years (2013-2019). The location and number of rain stations were analyzed using the Kagan-Rodda method based on the standards set by the WMO (World Meteorological Organization) of 100-250 km2/station. The result of the Kagan Method is the optimal number and pattern of placement of rain stations. The evaluation results from 10 stations in the Bolango Bone watershed showed that there were 3 stations, namely Pangi, Pinogu, and Sukamakmur, which did not meet the density of rain stations suggested by WMO. The correlation coefficient for monthly rainfall ranged from 0.4238-0.8351. This correlation value was the average of all rain stations in the Bolango Bone watershed. Based on the results of the Kagan-Rodda analysis, two recommendations were obtained. The first recommendation is to maintain the existing 10 stations with an average error Z1 = 4.12%, interpolation error Z2 = 9.24%, and the distance between stations l = 14.58 km, repositioning the rain stations to each vertex of the Kagan-Rodda triangle. The second recommendation is to add 4 new rain stations without repositioning the existing 10 rain stations with an average error Z1 = 3.45%, interpolation error Z2 = 8.93%, and distance between stations l = 12.32 km.
ANALISIS KINERJA SIMPANG TIGA TAK BERSINYAL MENGGUNAKAN SOFTWARE VISSIM PADA JALAN KALIMANTAN DAN JALAN ARIF RAHMAN HAKIM Sarapil, Siti Nurazizah; Kadir, Yuliyanti; Desei, Frice L.
Composite Journal Vol. 3 No. 2 (2023): 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.v3i2.58

Abstract

Persimpangan jalan berperan sangat penting dalam menjaga kelancaran arus lalu lintas. Persimpangan harus dilengkapi dengan pengaturan lalu lintas yang baik karena merupakan hal yang paling kritis dalam pergerakan lalu lintas secara menyeluruh pada jaringan jalan, akibatnya terjadi kemacetan. Tujuan dari penelitian ini adalah menganalisis kinerja simpang tiga tak bersinyal pada Jalan Arif Rahmah Hakim dan Jalan Kalimatan dengan menggunakan Software VISSIM dan Metode Manual Kapasitas Jalan Indonesia (MKJI). Berdasarkan hasil dari penelitian didapatkan volume pada jam sibuk yaitu pada pukul 17.00-18.00 sore hari Senin dengan volume kendaraan roda 2 sebanyak 2077 kendaraan/jam, roda 3 dengan 649 kendaraan/jam, kendaraan ringan dengan 449 kendaraan/jam dan kendaraan berat dengan 6 kendaraan/jam. Perhitungan menggunakan software VISSIM mendapatkan hasil tundaan pada masing-masing pendekat sebesar 37,3 detik/smp pada Jalan Arif Rahman Hakim (utara), 37,8 detik/smp pada Jalan Arif Rahman Hakim (selatan) dan 23,4 detik/smp pada Jalan Kalimantan (barat), dan panjang antrian pada masing-masing pendekat 35,4 m pada Jalan Arif Rahman (utara), 25,9 m pada Jalan Arif Rahman (selatan ) dan 29,3 Jalan Kalimantan (barat). Hasil perhitungan berdasarkan Manual kapasitas Jalan Indonesia (MKJI) 1997 mendapatkan hasil derajat kejenuhan (DS) sebesar 0,82, nilai tundaan (D) sebesar 13,36 det/smp dan nilai panjang antrian (QP atas) 53,66% - (QPbawah) 27,07%.
ANALISIS PRODUKTIVITAS TENAGA KERJA PADA PEKERJAAN FONDASI PEMBANGUNAN FASILITAS PENYIMPANAN PMI PROVINSI GORONTALO Jumi, Jumiati Bandu; Tuloli, M. Yusuf; Utiarahman, Arfan
Composite Journal Vol. 3 No. 2 (2023): 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.v3i2.66

Abstract

Labor productivity is one of the success factors of a project where the labor is directly involved in construction in the field. This study aims to know the level of labor productivity in the project for construction of PMI storage facility in Gorontalo Province. This study uses work sampling (productivity rating), which is a method that can be used to measure productivity easily to obtain the LUR (Labor Utilization Rate) value for each labor. This study is conducted by observing the productivity of 7 labors where the observation of productivity (LUR) is done for 22 days in each labor and the type of work observed is raft foundation work. The finding shows that the average labor productivity level in foundation work is 69.22% > 50°/». Thus, it can be concluded that the level of labor productivity in foundation work in the project for construction of the PMI storage facility in Gorontalo Province is quite productive and splendid. The avemge value of volume/labor is 0.163 m3 where its coefficient value in the field for excavation, soil compaction, workshop floor, formwork, and casting is higher than AHSP (Work Unit Price Analysis) 2016 whereas the value for reinforced bar and drainage reinforcement is higher.
STUDI PERBANDINGAN GELOMBANG DI PPI DONGGALA DENGAN MENGGUNAKAN METODE GUMBEL DAN METODE WEIBULL Setiyawan; Nurkhalisah
Composite Journal Vol. 3 No. 2 (2023): 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.v3i2.92

Abstract

The Donggala Fish Landing Port (PPI) in Central Sulawesi, located in Labuan Bajo Village, Banawa District, Donggala Regency, suffered damage from the 2018 earthquake and tsunami that affected Palu, Donggala, and surrounding areas, necessitating repairs. This study aims to determine wave heights at PPI Donggala and predict future wave occurrences using the Gumbel and Weibull methods. The analysis uses secondary data, specifically hourly wind data from PPI Donggala. The significant wave height (Hs) was 0.98 meters with a significant wave period (Ts) of 4.74 seconds in 2017, occurring in the north. For the Gumbel method, wave heights for return periods were: 0.802 meters for 2 years, 0.894 meters for 5 years, 0.954 meters for 10 years, 1.031 meters for 25 years, 1.088 meters for 50 years, and 1.145 meters for 100 years. Using the Weibull method, wave heights were 0.778 meters for 2 years, 0.872 meters for 5 years, 0.943 meters for 10 years, 1.037 meters for 25 years, 1.108 meters for 50 years, and 1.179 meters for 100 years. The comparison of the Root Mean Square Error (RMSE) values between the Gumbel and Weibull methods yielded an identical value of 1.110 meters, indicating that both methods are equally accurate for this analysis. This study provides essential data for planning and repairing the Donggala Fish Landing Port's dock facilities to withstand future wave conditions.

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