Article Per Year (5 Year)
p-Index From 2020 - 2025
0.444
P-Index
This Author published in this journals
All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Geosaintek
Rahayu, Helda Kusuma
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
IDENTIFIKASI KEMENERUSAN PIPA AIR BAWAH PERMUKAAN MENGGUNAKAN METODE GROUND PENETRATING RADAR (GPR) Lestari, Wien; Jannah, Afni Nur; Faqih, Ahmad; Dita, Mesya Sabhna Adma; Juliandro, Daniel; Rahayu, Helda Kusuma
Jurnal Geosaintek Vol. 10 No. 1 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

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

Abstract

Metode Ground Penetrating Radar (GPR) merupakan metode geofisika non destruktif yang menghasilkan resolusi tinggi terhadap kontras dielektrik bawah permukaan. Dengan menggunakan metode GPR, penelitian ini dilakukan untuk mengidentifikasi kemenerusan pipa air dan kepadatan lapisan pada daerah “AYE”. Frekuensi alat yang digunakan dalam pengambilan data adalah 270 MHz dengan jumlah lintasan sebanyak dua lintasan dan panjang tiap lintasan 20 m. Pengolahan dilakukan dengan program MATGPR dalam software Matlab 2015a. Tahap yang dilakukan dalam pengolahan antara lain input data, adjust signal position, remove DC component, dewow filter, median filter, inverse amplitude decay, removal global background, karhunen-loeve filter, bandpass filter, resample scan axis, 1-D velocity model, phase-shifting migration, 1D time to depth conversion, dan picking anomaly. Hasil pengolahan diperoleh penampang radargram dengan kedalaman ±7 meter. Dalam penampang radargram tersebut, diketahui dua anomali hiperbola yang sama diduga sebagai kemenerusan pipa air dengan bahan PVC pada meter 11.1 dan 18.1 dengan kedalaman 0,3 meter pada lintasan 1, dan ditemukan pada meter 10.7 dan 18.3 dengan kedalaman 0.9 meter pada lintasan 2. Anomali yang diduga pipa tersebut memiliki rentang kecepatan 0.0171 m/ns hingga 0.138 m/ns. Lapisan yang padat diindikasikan berada di kedalaman >4 meter yang ditunjukkan oleh reflektor dengan horizon yang kurang tajam, sedangkan lapisan bagian atas yang kurang padat diduga sebagai lapisan timbunan
Analysis of Formation Ronggojalu Spring and Probolinggo Active Fault Continuity with Satellite Data Gravity Method Rafi, M. Erfand Dzulfiqar; Fajar, M. Haris Miftakhul; Purwanto, M. Singgih; Hilyah, Anik; Bahri, Ayi Syaeful; Rahayu, Helda Kusuma
Jurnal Penelitian Pendidikan IPA Vol 9 No 10 (2023): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i10.3399

Abstract

The Ronggojalu spring, with a discharge intensity of more than 3,000L/second, makes it one of the spring with the most significant discharge in Indonesia and is the main supplier of clean water for the City of Probolinggo. From the observation of topographic maps, the existence of this spring forms a lineament with Paras Spring and Sumber Kramat with a direction of Northeast to Southwest. The presence of this lineament can indicate the existence of geological structures that play a role in the formation of spring. In addition, this lineament is in the same direction as the active Probolinggo fault identified by PUSGEN (Pusat Studi Gempa Nasional). This study aims to identify the presence of geological structures in the lineament using satellite gravity data GGMplus (Global Gravity Model) and Remote Sensing. This data is quite efficient and effective in identifying subsurface geological structures. With the SVD (Second Vertical Derivative) analysis, the residual anomaly results from the second derivative value of the Bouger anomaly so that it can show the density contrast value as an indication of the geological structure. From the results of the interpolation of satellite gravity data in the study area, the CBA (Complete Bouguer Anomaly) value range is -16.8 – 4.8 mGal. The analysis of SVD and FHD shows a significant contrast different values along the fault line that passes through the spring. The lineament density processing also shows a weak zone around the fault zone, indicating the continuity in that zone. The existence of a fault under this spring indicates the influence of the fault on the formation of Ronggojalu Spring, Paras Spring, and Keramat Spring. In addition, it is estimated that this fault is a continuation of the active Probolinggo fault.
Co-Authors Ahmad Faqih Bahri, Ayi Syaeful Dita, Mesya Sabhna Adma Fajar, M. Haris Miftakhul Hilyah, Anik Jannah, Afni Nur Juliandro, Daniel Lestari, Wien Purwanto, M. Singgih Rafi, M. Erfand Dzulfiqar