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All Journal VALENSI Jurnal Rekayasa Jurnal Rekayasa Sipil dan Desain Briliant: Jurnal Riset dan Konseptual Teras Jurnal Science and Physics Education Journal (SPEJ) Pendas : Jurnah Ilmiah Pendidikan Dasar Elipsoida : Jurnal Geodesi dan Geomatika EKOLOGIA : Jurnal Ilmiah Ilmu Dasar dan Lingkungan Hidup TAPAK (Teknologi Aplikasi Konstruksi) : Jurnal Program Studi Teknik Sipil Journal of Engineering and Scientific Research (JESR) Jurnal Teknik Industri Terintegrasi (JUTIN) Journal Coaching Education Sports Journal of Infrastructural in Civil Engineering (JICE) Teknika Sains : Jurnal Ilmu Teknik Warta AKAB PROFICIO: Jurnal Pengabdian Masyarakat Unnes Journal of Mathematics Education Indonesian Journal of Research and Educational Review (IJRER) e-SPORT: Jurnal Pendidikan Jasmani, Kesehatan dan Rekreasi Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) Jurnal Teknik Sumber Daya Air SENTRI: Jurnal Riset Ilmiah Informasi dan Promosi Kesehatan JPM-AKA Rona Teknik Pertanian PEDAMAS (Pengabdian Kepada Masyarakat) Jurnal Pengembangan Ilmu dan Praktik Kesehatan JSEHT Jurnal Meteorologi dan Geofisika Journal of Plano Studies International Journal of Science, Technology and Applications J-Sil (Jurnal Teknik Sipil dan Lingkungan) Journal Of Biology Education Research (JBER) Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Nemui Nyimah Datum: Journal of Geodesy and Geomatics SPORTIVE: Journal Of Physical Education, Sport and Recreation
Ahmad Zakaria
Fakultas Matematika dan Ilmu Pengetahuan Alam, Departemen Kimia, Institut Pertanian Bogor
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Comparative Analysis of Measured Tidal Data with Tidal Data from Forecasting (Case Study of Tanjung Priok Tidal Station) Dinaryoko, Arif; Zakaria, Ahmad; Tugiono, Subuh
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 9 No. 1 (2021): Edisi Maret 2021
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v9i1.1693

Abstract

AbstractThis research was conducted to study the tidal characteristics. The data used in this study are the hourly tide data measured in the field and the tidal data from the BIG with data length from 1985 to 1989 at the Tanjung Priok tidal station, Jakarta Province, Indonesia. This modeling is carried out using a data length of 30 days for a data term of 720. By using the observational data and applying it in the Anfor program which uses the least squares method, produces a tidal periodic model that is obtained using 9 tidal harmonic components. From the results of modeling and measured data it can be seen the correlation coefficient. Based on these results, it can be concluded that the measured tide data components with the BIG tide data components are similar. The average correlation coefficient between the two data sets was 0.9644. From this research it can be seen that the value of the tidal data is said to be very good. Keywords: daily tides, correlation coefficient
Analisis Pemodelan Numerik Redaman Breakwater Tenggelam Tipe Berlubang dan Tidak Berlubang Menggunakan Sigerd Lukitawati, Annika; Zakaria, Ahmad; Tugiono, Subuh; Winarno, Dwijoko
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 9 No. 1 (2021): Edisi Maret 2021
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v9i1.1714

Abstract

Continuous waves crashing into the coastal area can cause abrasion on the coast and damage facilities and settlements in the area. Therefore, a coastal protection building is needed to reduce wave energy before arriving at the beach such as a breakwater. To design a breakwater it is necessary to pay attention to wave deformation, one of which is wave diffraction. Where the wave when obstructed by an obstacle will bend around the end of the obstacle and enter the protected area behind it. The complex phenomena of nature are described in terms of equations, but they are difficult to solve analytically. So in this study solved numerically with the help of a computer with 2D wave simulation software based on the principle of the hyperbolic equation propagation model. Then get the results in the form of diffraction coefficient values that are close to the results obtained in the physical model research that has been carried out. Changes in wave height occur after passing through the breakwater which indicates a change in energy from before and after passing through the breakwater.
Analisis Kinerja Redaman Gelombang pada Breakwater Tenggelam Tipe Berlubang Dengan Pemodelan Fisik 2D Andika, Ivana Aprili; Tugiono, Subuh; Zakaria, Ahmad; Wahono, Endro P.
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 9 No. 1 (2021): Edisi Maret 2021
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v9i1.1722

Abstract

Loss of land due to coastal erosion that occurs naturally by wave abrasion. Therefore, to protect the coast from erosion or other matters, a breakwater is needed which destroys the energy of the waves before reaching the shore. This is the background of the author in taking the title of the thesis about the Performance Analysis of Wave Attenuation in the Hollow Type Breakwater Submerged Type 2-D Physical Modeling. The variables used in this study were incident wave height (Ho), calm water level (ds), and breakwater type. The results of this study indicate that the damping coefficient (Cr) was obtained using a sinking breakwater without a hole with a calm water level (ds) of 2 cm of 0.479 which is the most effective damping produced in an experiment using a breakwater that is free from calm water surface (ds). 2 cm. The wave attenuation obtained from the wave defraction test using 2 types of breakwaters resulted that the breakwater without the damping hole was greater than using a perforated breakwater.
Penggunaan Pasir Seragam pada Perbaikan Subgrade Ditinjau Terhadap Tebal Perkerasan Jalan (Swelling Potential dan Non Swelling Potential) Pratiwi, Ayu Ning Trias; Iswan, Iswan; Zakaria, Ahmad
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 9 No. 2 (2021): Edisi Juni 2021
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v9i2.1761

Abstract

Subgradeis the most important part to be used as the focus and support of all construction loads that are on it. If the subgrade is clay soil that has a low carrying capacity and is very sensitive to moisture content, then nearby buildings will often suffer damage, such as land located in Marga Kaya Village. In this study using the method of mixing native soil with stabilization material in the form of uniform sand derived from Mount Sugih with a mixture variation of 5%, 10% and 15% of the dry weight of the soil. The test results showed cbr unsoaked and soaked maximum occurred in sand mixture 15% with CBR Unsoaked value of 13.2% and CBR Soaked with a value of 2.9%. Road pavement thickness on CBR Unsoaked and Soaked efficiently on sand mixture 15% with thickness D1 = 2.75 cm, D2 = 20 and D3 = 10 cm, and CBR Soaked with thickness D1 = 8.75 cm, D2 = 20 cm and D3 = 10 cm. The value of swelling decreased from 11.4% to 7.4% in the addition of uniform sand by 15%. DDT value is influenced by cbr value the greater cbr value then DDT will increase.
The influence of el nino and la nina on rainfall data of east lampung regency, lampung province Gani, Rama Dian; Zakaria, Ahmad; Kusumastuti, Dyah Indriana
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 9 No. 2 (2021): Edisi Juni 2021
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v9i2.1763

Abstract

This research was conducted to determine the impact of the areas where El Nino and La Nina were the most dominant. The data used in this study are daily rainfall data in 5 rain stations located in East Lampung. Data length from 1989 to 2018 at each station, this data was taken from the Mesuji River Basin - Sekampung (BBWSMS). This modeling is carried out using a data length of 30 years for a data term of 10957.By using observational data and applying it in 2 programs, namely the Fast Fourier Transform (FFT) and the Lomb Periodogram, it produces values that can be graphed for the spectrum of each of the 5 rain station areas, namely Jepara Lake, Labuhan Ratu, Taman Negeri, Kota Raman and Sri Gading. From the results, it can be seen which areas are predominantly affected by El Nino and La Nina. Based on the results of the two programs, both show that the rain station in the Lake Jepara area experiences more dominant El Nino and La Nina influences. Keywords: El Nino, La Nina, rain station, rainfall, Fast Fourier Transform, Lomb Periodogram
Comparative Analysis of Tidal Data from Forecasting Results with Measured Tide Data (Meneng Tidal Station Case Study) Purna, Bagus Mustofa; Zakaria, Ahmad; Mariyanto, Mariyanto
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 9 No. 2 (2021): Edisi Juni 2021
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v9i2.1801

Abstract

AbstractThis research to find the similarity of the tidal characteristics of sea water, especially in the sea waters in the Meneng station area, where the data used is both hourly tide data from tide data from the website http: //tides.big.go.id and field measured tidal data for a period of 5 years, from 1988 to 1992 at the Meneng tidal station, East Java, Indonesia. The data used in this research have a minimum data length of 720 hours or 30 days, using 9 tidal harmonic components using the least squares method and then converted into the ANFOR program (Zakaria, 2005), this program can produce a periodic tidal data model. including the amplitude value that can be used to see a tidal characteristic of sea water. After the tidal data is modeled and analyzed, the correlation coefficient is generated. From the results of this study, it can be concluded that the component results obtained from the hourly tide data from the website http://tides.big.go.id and field measured data have something in common with the generated tidal components. The average correlation coefficient of the two data is 0.8010 and is included in the very good category. Keywords: tides, ANFOR, correlation coefficient
Studi Kasus Pada Ruas Jalan Kecamatan Batu Ketulis Lampung Barat dengan Menggunakan Analisis Komputasi dan Metode Penanganannya Nawawi, M Lucky Apriansyah; Iswan, I; Zakaria, Ahmad
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 9 No. 3 (2021): Edisi September 2021
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v9i3.1871

Abstract

Batu Ketulis is a sub-district located in West Lampung Regency, Lampung province. West Lampung is one of the areas in Lampung that has landslide-prone potential. This study is to determine the value of slope safety factors and calculate the stability of slopes using Bronjong to hold the soil carrying capacity to be safe and not landslide, which is calculated using computational programs with fellenius method, bishop with saturated, partially saturated, and unsaturated groundwater face conditions. The results showed that soil parameters affect the stability of the slope, the condition of fully saturated soil has the lowest value compared to other conditions. From the results of the study obtained the value of the smallest safe factor before handling, namely at location II with an elevation of 20 m and a slope angle of 30° ,35° ,40° of 1,074, 1,023, 1,008 in the condition of fully saturated groundwater face. In the condition of the slope after handling using bronjong obtained a value of 2,462, 2,303, 2,223 for the Fellenius method, while for the Bishop method of 2.12, 2,006, 1.95. Handling using bronjong has a big effect on increasing safe factors so that landslide handling using bronjong is quite stable if applied at the research site.
Analisis Perbandingan Kedalaman Gerusan Lokal (Local Souring) Di Hilir Bangunan Pelimpah (Ogee and Stepped Spillway) Dengan Model Fisik 2D Saputra, Eko Adi; Wahono, Endro Prasetyo; Zakaria, Ahmad
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 9 No. 3 (2021): Edisi September 2021
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v9i3.1914

Abstract

AbstrakSpillway atau disebut dengan bangunan pelimpah merupakan bangunan air yang memiliki fungsi untuk mengalirkan debit banjir yang masuk ke dalam waduk. Dalam perencanaan suatu bangunan air diperlukan penelitian terdahulu mengenai masalah penggerusan lokal (Local Scouring) yang terjadi akibat adanya kecepatan air dan turbulensi yang melampaui daya tahan dari dasar saluran pada bagian hilir bangunan. Dari analisis hidrolika penelitian ini menggunakan desain bangunan pelimpah Ogee and Stepped dengan model fisik 2-D dan sedimen yang digunakan adalah pasir dengan diameter seragam yaitu 1,8 mm atau lolos ayakan no. 16. Penelitian ini menunjukkan 5 kali pengamatan pola gerusan lokal di hilir bendung pada setiap percobaan selama 25 menit. Pengamatan gerusan meliputi besarnya debit dan kedalaman gerusan maksimum yang terjadi pada hilir bendung. Pada bangunan pelimpah Ogee Spillway gerusan maksimum (dsmax) terjadi pada ketinggian di hulu (H0) 3 cm sebesar 0,097 m dengan Lds sebesar 0,17 m dari hilir pelimpah. Pada bangunan pelimpah Stepped Spillway gerusan maksimum (dsmax) terjadi pada ketinggian di hulu (H0) 3 cm sebesar 0,125 m dengan Lds sebesar 0,09 m dari hilir pelimpah. Hal ini menunjukkan bahwa semakin besar debit aliran, maka semakin besar kedalaman gerusan yang terjadi.  Kata kunci : Pelimpah Ogee and Stepped Spillway, Gerusan Lokal, Sedimen.
The effect of El Nino and La nina on the rain data of Lampung Barat Regency, Lampung Province Hartantio, Fajar; Zakaria, Ahmad; Kusumastuti, Dyah
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 9 No. 3 (2021): Edisi September 2021
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v9i3.1926

Abstract

The purpose of this research to analyze and determine dominant impact area due to the effect of El Nino and La Nina on 6 rainfall station in west Lampung Regency, Lampung Province. This study also compred between Fast Fourier Transform (FFT) methods, and Lomb Periodogram methods. This study using rainfall data from 1998 to 2019 taken from Balai Besar Wilayah Sungai Mesuji – Sekampung (BBWSMS). According on comparison result, it is known that both methods indicate that Air Hitam Rainfall Station experience the effect of El Nino and La Nina more dominantly than the others, with the looping period of 3,9165 years from Lomb Periodogram method and 3,7381 years from (FFT) Method. It is also known that Lomb Periodogram Method has a better accuracy than (FFT) method. This is because Lomb Periodogram can read the length of data more accurately than Fast Fourier Transform (FFT) method.  Keywords: El Nino, La Nina, rain station, rainfall, Fast Fourier Transform, Lomb Periodogram
Perbandingan Analisis Data Curah Hujan yang Hilang di Daerah Lampung Barat dengan Menggunakan Metode Normal Ratio, Rata-Rata Aljabar, Inversed Square Distance, dan Modified Method Gultom, Winda Maria Rebecca; Zakaria, Ahmad; Kusumastuti, Dyah Indriana
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 9 No. 3 (2021): Edisi September 2021
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v9i3.1927

Abstract

Curah hujan merupakan data yang sangat penting untuk memprediksi kondisi suatu daerah sebagai awal dari perencanaan pembangunan. Namun ada kalanya alat pencatat hujan pada stasiun tertentu rusak sehingga data hujan tidak tercatat atau disebut hilang. Dalam penelitian ini, saya mencoba menganalisis data curah hujan di lampung barat dengan menggunakan metode rata-rata aljabar, normal ratio, inversed square distance, serta metode modifikasi. Setelah saya teliti ternyata didapatkan bahwa metode modifikasi inversed square distance yang saya buat mendapatkan hasil yang paling baik. Nilai korelasi metode tersebut termasuk dalam kategori cukup baik. Kata kunci : Data Hujan Hilang, Curah Hujan, Lampung Barat, Metode Rata-Rata Aljabar, Metode Normal Ratio, Metode Inversed Square Distance, Metode Modifikasi
Co-Authors Abyuliani, Alza Achmad Karim adama, riri arinda Afriami, Lusmeilia Agatha, Muhammad Naufal Agustriyanto, Dono Ahmad Herison Ahmad Tusi Aji Saputra, Aji Aji, Badruzzaman Al Rasyid, Burhan Najib Amanda, Tiara Maelta Amidi Amidi, Amidi Amri, Resica Permata Andika, Ivana Aprili Angelina Angelina Anggraini , Melisa anggraini, yeshe Angin, Geleng Perangin Ardian, Riko Berli Arfanda, Poppy Elisano Arie Pratama Putra Arief, Farah Diba Arifaini , Nur Arizona, Bramesvara Armijon . Asep Irvan Irvani Ashruri Ashruri, Ashruri Asri Oktiani Asrorudin, Udin Atika Sari Atmoko, Fajar Destri Aynuddin, . Aynuddin, Aynuddin Ayu Kurniasih, Ayu Ayuningsih, Titik Cesar, Irvan Tegar Chairil Anwar Citra Dewi Damayanti, Amelia Nurul Dian Kusumaningsih Dian Pratiwi Didik Didik Dinaryoko, Arif Djanis, Ratnawati L. Djanis, Ratnawati Lilasari Djasmasari, Wittri Dwi Arnanda Putra, Novindio Dwi Joko Winarno Dyah Indriana K Dyah Indriana Kusumastuti Efendi, Muhamad Masjun Elvida, Maharani Endang Sri Lestari Endro Prasetyo Wahono Fachrurrazie, . Fachrurrazie, Fachrurrazie Fadela, Dian Mira Fathony, Awal Rifan Fatoni, Fatoni Fatria, Akhmad Ridho Fatria, Akhmad Ridho Fikri, Modh. Haikal Finanda, Reysa Fitria, Mizha Nur Fridayanto, Syahlan Naufal Gani, Rama Dian Gatot Eko Susilo Gultom, Winda Maria Rebecca Habib Algifari Hadi, Yohannes Martono Handayani, Agustia Handayani, Esty Hardi, Alif Aryadi Hartantio, Fajar Hartoto, Dwi Nanda Putra hasyimzoem, Edwin Faisol Hayat, Mohammad Haz, Arzuu Abnu Haziman, Muhammad Luthfan Herawati Herawati Herdiana, I Komang Tri Herizon, Ahmad Ians Aprilo Ichsani, Muhammad Desyan Idharmahadi Adha Imran, Fadli Indriana K, Dyah Iswan Iswan Iswan, I Jalal, Muhammad Agung Wijdan Jamaludin HN, . Jauhari Arifin Jaya, Redhinansyah Kurniawan Jerfikanasa Murda, Gung Bagus Joko, Dwi Karim, Achmad Kholiq, Muhammad Nur Kristianto Usman kuncoro, wahyu hadi Kurniawan, Deri Rahli Kurniawan, Panca Kurniawan, Rizqi Kurniyawan, Ikhfan Kusanti, Nency Dwi Kusumastuti, Dyah Kusumastuti, Dyah I. kuswadi, didit kuswadi Laksmana, M. Bima Lepiana, Tenti Lukitawati, Annika Lusmeilia Afriani M Imran Hasanuddin M Rizky Ismail M. Said Zainuddin Manurung, Lodewick Mapiliandari, Inda Mappaompo, M. Adam Mariyanto Mariyanto Masdar Helmi MMSI Irfan ,S. Kom Muhammad Fadli Nawawi, M Lucky Apriansyah Niken, Chatarina Ningtyas, Widya Nurcahya Novianti, Tika Christy Nugraha , Billy Nugraheni, Melly Nur Arifaini Nurdiani Nurdiani, Nurdiani Nurdiani, . Ofik Taufik P, Ofik Ofik Taufik Purwadi, Ofik Taufik Pelawi, Rinaldi Peranginangin, Imanuel Perdana, Damar Adi PERMADI, I GUSTI AGUNG DIDIT EKA Persada, Citra Phohan, Phohan Pradipta, Adya Rizky Prasetio, Rizki Lazuardi Prasetyo, Agus Ari Pratiwi, Ayu Ning Trias Prawaka, Fanny Prawaka, Muhammad Hendro Purna, Bagus Mustofa Purwadi , Ofik Taupik Purwadi, Ofik Taupik Purwadi, Ofik Toupik Purwadi, Opik Taufik Qur'ani, Mutiara Nurul Rachmanda, Farhan Rachmi, Silvia Rachmy, Silvia Rahayu Sulistyorini Randy Setiawan, Randy Razak, Risdha Sagita Restika Putri Retno Farhana Nurulita Rina Indriani Rinaldi, M. Fahmi Rizky Al Mufarid, Andi Muhammad Romdani, Yuda Romi Fadly Rosalina Rosalina Rosalina, . Salsabila, Adira Sampurna, Sindu Abadi Saputra, Datra Peta Saputra, Eko Adi Saputra, Fajar Ilham Saputro, Rifki Ananda Sari, Dwi Winda Sari, Okta Mulya Sasongko, Respati Anton Sauri, Sopian Septian, Rio Dwi Septiansari, Annisa Putri Dwi Setia, Vika Setyanto Setyanto Setyanugraha, Tegar Sitanaya, Brigitha Cindy Siti Nurdianti Muhajir Siti Nurul Khotimah Siti Nurul Khotimah Slamet Riyadi Styani, Erna Subuh Tugiono, Subuh Suharni Suharni Sulistiyorini, Rahayu Sumarno, Ari Pitoyo Sumharni, Sumiharni Sumiharni Sumiharni Suyadi Suyadi Syah, Aminudin Syahruli, Firman Tambunan, Jenny Anna Margaretha Taufik P, Ofik Tomi, Muhammad Tridawati, Anggun Trisdiana, Fitri Trisno Imany, Tri Subakti Tuhu Pangestu, Ibnu Umar, Rizki Prinanda Usman, Arifuddin W, Endro W, Endro Prasetyo Wahono, Endro Wahono, Endro Praseyto Wardhani, Puspita Sri Ayu Welly, Margareta Widya Anggraeni, Widya Wijaya, Riki Chandra Winarno, Dwijoko Yacub, Vanita Kesumawati Yandriguna, Medi Yanti, Cristi Yohanes Martono Hadi Yuda Romdania yulianto, alim Yusma Sari, Nia Hana Zainuddin, M Said