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All Journal Jurnal Ilmiah Teknik Sipil Lontar Komputer: Jurnal Ilmiah Teknologi Informasi Buletin Udayana Mengabdi Jurnal Spektran MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Penelitian Pendidikan IPA (JPPIPA) Sainteks: Jurnal Sain dan Teknik
Ni Nyoman Pujianiki
Program Studi Magister Teknik Sipil Universitas Udayana
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

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ANALISIS INTRUSI AIR LAUT PADA SUMUR GALI DI KAWASAN CANDIDASA KARANGASEM Ni Nyoman Pujianiki; I Gusti Bagus Sila Dharma; Ida Ayu Meitri Wijayantari
JURNAL SPEKTRAN Vol 7 No 1 (2019): Vol. 7, No.1, Januari 2019
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (438.894 KB)

Abstract

ANALISYS OF SEAWATER INTRUSION THE DIG WELLS AT CANDIDASA KARANGASEM Water intake in large quantities and uncontrollable in Candidasa area can cause groundwater level deceased, which will cause the flow reversed from sea to land and cause intrusion of seawater into the mainland. It is also mentioned in Karangasem regency regulation article 24 number 3 point H that seawater intrusion prone area located in Candidasa and Tulamben area. This study aimed to invetigate how far is the effect of seawater intrusion based on soil water conductivity value, considering the position of interface, and maximum debit can be taken to prevent wide intrusion. This research method uses descriptive quantitative method. Furthermore, to determine the extent of the intrusion occured, measurement to the value of well conductivity, measurement of groundwater level, depth of the well, well elevation and well distance from beach line for the 5 sample of wells. Interface position counted using the equation of Badon Ghyben-Herzberg, and the debit maximum exploitation counted using the equation of Mercado and Schmorak. The result of this study showed that the value of conductivity decreased, if the distance of well getting farther from the beach line. There are 3 wells getting intrusion with conductivity value of more than 1000 mS/cm, the 3 wells has distance of less than 100m from beach line. Interface position in the location of this study has got intrusion in distance of 81,52m from beach line. The maximum debit allowed ranged from 1,448 m3/days until 125,90 m3/days. As references to prevent wide intrusion, therefore to dig next well it is better to use distance of more than 100m from beach line, with interface deep that still under value of MSL, with well depth of ±15m
A New Simple Procedure for Extracting Coastline from SAR Image Based on Low Pass Filter and Edge Detection Algorithm Ni Nyoman Pujianiki; I Nyoman Sudi Parwata; Takahiro Osawa
Lontar Komputer : Jurnal Ilmiah Teknologi Informasi Vol 12 No 3 (2021): Vol. 12, No. 03 December 2021
Publisher : Institute for Research and Community Services, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/LKJITI.2021.v12.i03.p05

Abstract

This study proposes a new simple procedure for extracting coastline from Synthetic Aperture Radar (SAR) images by utilizing a low-pass filter and edge detection algorithm. The low-pass filter is used to improve the histogram of the pixel value of the SAR image. It provides better distribution of pixel value and makes it easy to separate between sea and land surfaces. This study provides the processing steps using open-source software, i.e., SNAP SAR processor and QGIS application. This procedure has been tested using dual polarization Sentinel-1 (10x10 meters resolution) and single polarization ALOS-2 (3x3 meters resolution) dataset. The results show that using Sentinel-1 with dual polarization (VH) provides a better result than single polarization (VV). In the ALOS-2 case, only single polarization (HH) is available. However, even using only HH polarization, ALOS-2 provides a good result. In terms of resolution, ALOS-2 provides a better coastline than Sentinel-1 data due to ALOS-2 has better resolution. This procedure is expected to be helpful to detect coastline changes and for coastal area management.
REVITALISASI PANTAI PEBUAHAN KABUPATEN JEMBRANA Ni Nyoman Pujianiki
Jurnal Ilmiah Teknik Sipil Vol 26 No 2 (2022): Jurnal Ilmiah Teknik Sipil, Vol. 26 No. 2, Juli 2022
Publisher : Department of Civil Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JITS.2022.v26.i02.p02

Abstract

Pantai Pebuahan merupakan salah satu pantai yang mengalami abrasi yang cukup tinggi. Hasil monitoring perubahan garis pantai di Pantai Pebuahan selama periode tahun 2004 sampai 2019 dengan satelit Landsat menunjukkan bahwa luas abrasi sebesar 145.549,32 m2. Abrasi yang terjadi di Pantai Pebuahan merupakan dampak dari adanya PPN Pengambengan yang menyebabkan terhambatnya transpor sedimen. Berbagai upaya telah dilakukan oleh masyarakat setempat dan pemerintah untuk menanggulangi semakin mundurnya garis pantai di Pantai Pebuahan dengan struktur ramah lingkungan. Namun struktur revetment dan geotube berupa karung dan geotextile yang berisikan pasir, belum efektif. Untuk itu diperlukan bangunan struktur keras (hard structure) yang direncanakan berdasarkan karakteristik pantai Pebuahan. Pemecah gelombang yang terbuat dari dolos dipilih karena memiliki stabilitas hidraulik yang lebih baik. Hasil analisis menunjukkan bahwa dimensi pemecah gelombang dengan dolos memiliki tinggi 4,74 m dan panjang 115 m dengan jarak antar pemecah gelombang adalah 57,5 m. Lebar puncak bangunan direncanakan 6,52 m dengan berat batu lapis pertama adalah 0,5 ton setebal 1,19 m, berat batu lapis kedua adalah 50 kg dengan tebal 0,62 m, sedangkan batu lapis inti didesain seberat 2,5 kg.
Rainfall Data as an Indicator of Climate Change (Case Study: Kuta District, Badung Regency) Yasa, I Putu Bagus Reka Sugita; Pujianiki, Ni Nyoman; Pariartha, I Putu Gustave Suryantara
Sainteks: Jurnal Sain dan Teknik Vol 7 No 02 (2025): September
Publisher : Universitas Insan Cendekia Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37577/sainteks.v7i02.941

Abstract

Climate change is a global issue that has a clear impact on rainfall patterns, especially in coastal areas. This study examines rainfall changes in Kuta District, Badung Regency, using CHIRPS satellite data from 1981 to 2024. The validity of CHIRPS data was confirmed by comparing it with data from the Ngurah Rai meteorological station (1 station; 1981–2020 period; monthly scale) by matching the CHIRPS grid to the station location. The validation showed a high level of accuracy (r = 0.934; R² = 0.878), thus proving the reliability of CHIRPS as a data source. Trend analysis using the Mann-Kendall test, along with Sen's slope calculation (+7.92 mm/year; 95% CI), showed a statistically significant increase (p < 0.05). Furthermore, trend testing on the extreme rainfall intensity index (R50mm, RX1day) revealed an increase in the frequency of heavy rainfall after 2019, which was confirmed by indications of abrupt changes based on the Pettitt test. The results of this study align with scientific publications and climate change projections in tropical regions. These findings emphasize the importance of monitoring using remote sensing technology in areas with limited rain gauge stations. These findings imply the need to formulate adaptation strategies related to hydrometeorology and improved water resource management.
Evaluation of the Potential for Acid Mine Drainage Formation From Pit Lake Walls and its Interaction with the Aquifer System Purwaningsih, Diyah Ayu; Redana, I W; Harmayani, Kadek Diana; Pujianiki, Ni Nyoman
Jurnal Penelitian Pendidikan IPA Vol 11 No 5 (2025): May
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i5.11057

Abstract

Pit lakes are water bodies that gradually accumulate in former open-pit mine excavations once mining operations have ceased, typically filled by rainfall, surface runoff, or infiltration from groundwater. Their existence can pose environmental challenges, particularly the development of “acid mine drainage (AMD)”, which is often indicated by low pH values and elevated levels of dissolved metals. This research focuses on evaluating the geochemical properties of pit wall rocks and the water quality within pit lakes in the Separi coal mining region of East Kalimantan. The objective is to determine the likelihood of AMD generation and assess whether contaminants may migrate into the surrounding groundwater system. Field sampling involved collecting materials from pit wall rock, water within the pit lake, adjacent surface water, and groundwater monitoring wells. Mineralogical analysis was performed using X-Ray Diffraction (XRD), while elemental composition was identified through X-Ray Fluorescence (XRF). Water quality parameters such as pH, total dissolved solids (TDS), electrical conductivity, and concentrations of metals—specifically iron (Fe) and manganese (Mn)—were measured using Atomic Absorption Spectroscopy (AAS) and ion chromatography techniques. The findings reveal that several rock samples fall into the Potentially Acid Forming (PAF) category, attributed to their low acid-neutralizing capacity and elevated sulfur content, especially in samples containing pyrite. The pit lake water was found to be acidic (pH 4.2–4.6), with high levels of Fe and Mn, suggesting active sulfide oxidation. Conversely, groundwater from nearby areas displayed more neutral pH values (5.4–6.4) and lower metal concentrations, although some locations still showed contamination risks. These results underscore the need for a comprehensive understanding of geochemical processes and highlight the importance of preventive strategies, such as isolating reactive materials, managing hydrological inputs, and consistently monitoring water quality for long-term environmental protection
Co-Authors Dewa Ayu Septyadnya Dewi Gede Agus Bawantu I Gusti Bagus Sila Dharma I Gusti Ngurah Putra Dirgayusa I K.G. Wirawan I Ketut Adi Sugita I Made Dwi Bhaskara Nugraha I Made Rai Januatmika I Nengah Simpen I Nengah Simpen I Nyoman Sudi Parwata I PUTU GUSTAVE SURYANTARA PARIARTHA I Wayan Redana Ida Ayu Meitri Wijayantari Ida Ayu Rai Widhiawati Ida Bagus Ngurah Purbawijaya Ika Umratul Ika Umratul, Ika Jamhari Jamhari K. Astawa Kadek Diana Harmayani Ni Wayan Lilik Piramida Eka Sari Purwaningsih, Diyah Ayu Redana, I W SATRIYAS ILYAS Takahiro Osawa Yasa, I Putu Bagus Reka Sugita