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All Journal Jurnal Rekayasa Jurnal Rekayasa Sipil dan Desain Journal of Engineering and Scientific Research (JESR)
Ahmad Zakaria
Universitas Lampung
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Other

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MODEL PERIODIK DAN STOKASTIK DATA PASANG SURUT JAM-JAMAN DARI PELABUHAN PANJANG Ahmad Zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 1 (2015): Edisi April 2015
Publisher : UNIVERSITAS LAMPUNG

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Abstract

The aim of this study are intended to compare periodic and stochastic tide models generated by using FFT frequencies and astronomic frequencies. The Fourier series are used to simulated peri- odic model, and the autoregressive method is employed to simulate stochastic model. 253 domi- nant FFT frequencies and 9 astronomic frequencies are used as constituent frequencies to simulate periodic models. 512 hours of data are used for the model. Results of this study present that the periodic and stochastic models using the FFT frequencies give more accurate results than periodic and stochastic models by using the astronomic frequen - cies.
Studi Akurasi Sensor Ultrasonik Tipe US-015 Untuk Pengukuran Pasang Surut Air Laut Daerah Bergelombang Dwi Nanda Putra Hartoto; Romi Fadly; Ahmad Zakaria
Jurnal Rekayasa Sipil dan Desain Vol 8, No 1 (2020): Edisi Maret 2020
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

The technology in observing tides has developed, with the discovery of sensors that can make observations of tides automatically. one of the sensors that can be used for tidal observation is an ultrasonic sensor that works based on the principle of ultrasonic waves. Natural phenomena that occur such as sea level waves can affect the accuracy of tidal readings using ultrasonic sensors. This study aims to design an ultrasonic sensor-based tide instrument that can reduce sea wave interference and calculate the accuracy of the reading results of the instrument. Data collection was observed per 1 second, then the data was divided into several intervals, that is 1 second, 5 minutes, 15 minutes and 30 minutes. The accuracy of the instrument is calculated based on the observed manual data per 30 minute interval, after that the data will be tested for correlation and significance between the variables of closed automatic instrument, automatic open instrument and manual observed. This study produces equipment for automatic tide measurement that can reduce waves with ultrasonic sensors. The results of testing the data from 3 observations obtained accuracy of the closed automatic instrument has better accuracy that is 99.1981%, 99.3007%, 99.3156%. Keywords: Tides, Ultrasonic sensor, Microcontroller, Arduino uno.
Perbandingan Analisis Data Curah Hujan Yang Hilang Menggunakan Metode Reciprocal, Normal Ratio , Dan Rata-Rata Aljabar (Studi Kasus : Curah Hujan Beberapa Stasiun Hujan Daerah Pringsewu) edwin faisol hasyimzoem; Ahmad Zakaria; Sumiharni Sumharni
Jurnal Rekayasa Sipil dan Desain Vol 7, No 1 (2019): Edisi Maret 2019
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

Rainfall data is one of the data which plays an important role in order to calculate construction project, especially for flood hazard zone nor near the river zone and coastal area. In rainfall data recording sometimes an unwanted thing happened like a rainfall data vacancy in certain area, this is certainly has an impact on the construction’s calculation. On a missing rainfall data, predictions can be made using the method of reciprocal, normal ratio, an algebraic average. The purpose of this sudy is to determine the correlation value from the result of rainfall data predictions by comparing the correlation values of these three methods by using three stations R002,006,R018 in pringsewu regency. This study also aims to determine the fluctuations in the results of these three methods, which methods produces the best correlation and not too fluctuating in order to replace the missing rainfall data. The results of this research that has been done, using the method of reciprocal obtained that standard deviation give the best result among other I 0,22 which is categorized as poor value and the result of correlation average is 0,36 which is categorized as good enough. This result is the best value among the other methods which is calculated using data per years for 34 years.Keywords: algebraic average method, reciprocal method, normal ratio method, missing rainfall data, pearson correlation, standard deviation.
Perbaikan Tanah Organik Dengan Metode Preloading Prefabricated Vertical Drain (PVD) Firman Syahruli; Lusmeilia Afriani; Ahmad Zakaria; Aminudin Syah
Jurnal Rekayasa Sipil dan Desain Vol 10, No 1 (2022): Edisi Maret 2022
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

Tanah organik mempunyai sifat kurang baik secara teknis untuk mendukung suatu pekerjaan kontruksi. Tanah tersebut mengalami penurunan yang besar dan dalam waktu yang sangat lama. Hal inilah yang sering menjadi masalah dalam pelaksanaan suatu pekerjaan kontruksi. Pada studi kasus tanah timbunan di proyek tol Pekanbaru-padang seksi sicincin-lubuk alung - padang, perbaikan tanah organic untuk mengatasi masalah diatas adalah dengan cara menggunakan kombinasi antaraPreloading dan Prefabricated Vertical Drain (PVD). Pemasangan PVD dapat mempercepat waktupenurunan yang terjadi karena disipasi air pori terjadi dalam arah vertical. Dalam tugas akhir ini, dilakukananalisaperhitungankonsolidasitanahdengan menggunakan metode elemen hingga. Analisa kedalaman antar PVD untuk mendapatkan jarak yang paling efektif yang disesuaikan dengan waktu konsolidasi yang paling cepat ,jarak kedalaman PVD yang diperhitungkan ialah 9 m, 8 m, 7 m. Dari hasil perhitungan tanpa menggunakan PVD diperoleh waktu 25000 hari dan mengalami penurunan sebesar 0,905 m. Sedangkan dengan jarak kedalaman PVD 9 m menghasilkan waktu konsolidasi 163 hari dan mengalamipenurunan 0,868 m, jarak antar PVD 8 m menghasilkan waktu konsolidasi 163 hari dan mengalami penurunan 0,868 m , dan kedalaman 7 m mengasilkan waktu konsolidasi selama 163 hari dengan penurunan 0,882 m. Dari analisa yang telah dilakukan dapat disimpulkan bahwa jarak pemasangan yang paling efektif adalah menggunakan kombinasi preloading dan PVD dengan kedalaman PVD 9 m.
Correlation of BMKG with TRMM for daily and monthly rainfall series in Banten region Ahmad Zakaria; Sumiharni Sumiharni
Journal of Engineering and Scientific Research Vol. 4 No. 1 (2022)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1413.154 KB) | DOI: 10.23960/jesr.v4i1.78

Abstract

Daily and monthly rainfall data series are necessary data for planning purposes in Civil Engineering and other fields. Incomplete rainfall data often occurs, so that rainfall data must be estimated based on rainfall data from several other nearby locations. The addition of rainfall data can lead to inaccurate planning. Rainfall data used for planning in the civil engineering sector is usually taken from the BMKG station. This data is taken from the rainfall station above the ground. Besides, that can also produce rainfall data from TRMM. Can take rainfall data from TRMM at all locations according to a coordinate of location. This rainfall data denotes an average rainfall taken from the satellite approximately 250 meters above the ground surface. An equation will be obtained by comparing the daily and monthly rainfall data from the two data sources. Based on TRMM rainfall, we can use the equation to estimate ground rainfall in a location. In this study, daily rainfall, monthly rainfall, the spectrum of daily and monthly rainfall data from BMKG are compared with rainfall and the spectrum of daily and monthly rainfall data from TRMM. The analysis results show that the monthly rainfall data from TRMM and BMKG correlate better than daily rainfall data.
Co-Authors Ahmad Herison Dharmawan Setioko Dwi Nanda Putra Hartoto Dyah Indriana Kusumastuti edwin faisol hasyimzoem Endro Prasetyo Wahono Firman Syahruli Gatot Eko Susilo Geleng Perangin Angin Kartini Susilowati Lusmeilia Afriani Margaretta Welly Mirnanda Cambodia Qodri Ismail Rasimin Rasimin Rian Alfian Romi Fadly Sumiharni Sumharni Sumiharni Sumiharni Syah, Aminudin