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All Journal 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

Author-ID : 2921798

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Education Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

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Articles

Aplikasi Geolistrik pada Pemetaan Daerah Intrusi Air Laut di Pantai Candidasa Pujianiki, Ni Nyoman; Simpen, I Nengah
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 24, Nomor 1, JULI 2018
Publisher : Department of Civil Engineering, Diponegoro University

To know the magnitude of sea water intrusion that occurred in Candidasa area need to be mapping by using Geo-electric Method. Geo-electric method is one Geophysical method that works by injecting an electric current into the ground and then measured the potential difference it generates. Based on the data of electric current and potential difference, resistivity will be obtained in the research area. The result of sea water intrusion mapping in Candi Dasa beach area indicates that sea water intrusion has occurred but not yet on the status of conspiracy. If groundwater extraction is not restricted, the level of intrusion will continue to increase. Contour resistivity indicates that there has been a sea water intrusion in the Candidasa Tourism Area in a mild status in the southeast area at a depth of 5-10 m. The measured rock resistivity values in the study sites ranged from 0.35 to 1800 ohm.m, the seawater intrusion criteria occurred at a resistivity of 0.5 - 30 ohm.m. The results of the study are expected to give policyholders input on sea water intrusion in Candidasa Tourism area so that appropriate policy steps can be taken.

SISTEM PENJERNIHAN AIR LIMBAH PEMOTONGAN BATU LAHAR DI DESA MUNGGU KABUPATEN BADUNG I K.G. Wirawan; I K.G. Sugita; N.N. Pujianiki; K. Astawa
Buletin Udayana Mengabdi Vol 17 No 4 (2018): Buletin Udayana Mengabdi
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Saluran irigasi di desa Munggu banyak dibuat oleh pemerintah Kabupaten Badung maupun masyarakat setempat. Saluran ini sering mengalami pendangkalan karena kurang pemahaman atau pengetahuan masyarakat tentang konsep bak penampungan air limbah sebelum dibuang ke saluran irigasi maupun badan sungai. Pendangkalan saluran irigasi dihasilkan dari pengerajin pemotongan batu lahar yang merupakan salah satu penghasil limbah sedimen. Metode kegiatan dalam pengabdian kepada masyarakat ini adalah (i) membuat bak penampung air kotor, (ii) memberikan gambaran proses penjernihan air kotor menjadi air irigasi dan penerapannya. Sasaran kegiatan pengabdian adalah pengerajin batu lahar, termasuk usaha bersama atau kelompok usaha di pedesaan dengan kondisi manajemen masih bersifat konvensional dan lemah. Kegiatan ini akan sukses apabila melibatkan pemangku kepentingan (stakeholder) di desa Munggu. Pengabdian kepada masyarakat ini menghasilkan produk saluran air buangan/kotor yang berasal dari hasil pemotongan batu lahar mengalir melalui saluran terbuka dengan penampang berbentuk setengah lingkaran. Air tersebut kemudian masuk ke dalam bak penampungan melalui saluran inlet. Dasar dan dinding bak penampung terbuat dari batako tanpa dilakukan proses finishing. Untuk menjaga keamanan, bak penampung ditutupi dengan plat beton. Kotoran batu lahar akan mengendap di bagian bawah dan air di bagian atas bak penampung. Saluran outlet dibuat untuk aliran air jernih yang terbuat dari pipa PVC dengan diameter 4 inchi sebelum dibuang ke saluran irigasi.

POTENSI AIR PERMUKAAN DAERAH ALIRAN SUNGAI UNDA UNTUK MEMENUHI KEBUTUHANAIR DOMESTIK DAN NON DOMESTIK DI KABUPATEN KARANGASEM Gede Agus Bawantu; I Gusti Bagus Sila Dharma; Ni Nyoman Pujianiki
JURNAL SPEKTRAN Vol 6 No 1 (2018): Vol. 6, No. 1, Januari 2018
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (632.578 KB)

Karangasem regency, which had a population of 406,600 inhabitants in 2014, still has areas that are prone to water supply to meet the domestic and non-domestic needs. This is proved by the fact that some 16 villages are not served by PDAM network spreading across Selat, Sidemen, Bebandem, Abang and Kubu districts. There is Undawatershed which still has the potential to be developed, in addition to the approximately 90 percent of the watershed area of Unda and springs that provide supply to the area contained in the administrative region of Karangasem regency. The availability of water, was analized using the water balance principle of NRECA and F.J Mock methods as the most appropriate model to the location of study. Synthetic discharge data of the analysis results are used as data in the analysis of mainstay discharge so the potential for surface water that can still be used are known and developed in the Undawatershed. In order to harness the potential of the surface water in the watershed of Unda, the simulation of water allocation of Undawatershed. Based on the results of rainfall data of 2003 to 2014 coupled with the supply of water springs discharge, the average discharge potential of Undawatershed for Q80 is 11.54 m3/sec and for Q90 is 8.97 m3/sec. To plan the utilization and development of surface water potential of Undawatershed, from some of the scenarios that have been made it is known that the potential available in the watershed of Unda can be utilized to meet the domestic and non-domestic water needs of community in five (5) districts suffered from water crisis in Karangasem regency including Selat, Sidemen, Bebandem, Abang and Kubu districts. Keywords: surface water potential, the domestic and non-domestic water needs, utilization and development plan.

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)

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

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

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

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

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