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Wayangkau, Helen Giandita
Cenderawasih University, Jayapura, Indonesia
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Determination of The Position and Depth of Aquifers in The Kobakma District of Central Mamberamo District Duha Awaluddin Kurniatullah; Hery Dualembang; Wika Matana Nion; Helen Gianditha Wayangkau; Rahmat Tatayo Lie
Jurnal Indonesia Sosial Teknologi Vol. 5 No. 12 (2024): Jurnal Indonesia Sosial Teknologi
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jist.v5i12.1367

Abstract

Groundwater availability in aquifers is crucial for sustaining human settlements, particularly in Kobakma District, Central Mamberamo Regency, where clean water distribution faces significant challenges due to seasonal fluctuations and infrastructure limitations. The lack of groundwater utilization has resulted in local communities relying on rainwater as their primary water source, highlighting the necessity to identify potential groundwater sources. This research aims to determine the position and depth of aquifers in Kobakma District using the geoelectric resistivity method. By identifying subsurface conditions and geological formations, the study seeks to map groundwater availability and provide recommendations for sustainable water resource management in the region. The study employs the geoelectric resistivity method using the Schlumberger configuration to measure subsurface resistivity. Data collection was conducted across 13 test points within Kobakma District. The collected resistivity values were analyzed to interpret subsurface lithology and identify potential aquifer zones. The study primarily focuses on detecting free and confined aquifers, considering variations in rock formations, permeability, and groundwater flow dynamics. The results indicate the presence of two primary aquifer layers: a free aquifer distributed across various locations at depths ranging from 10–60 meters and a confined aquifer found at depths between 100–300 meters. Some test points showed aquifer leakage due to fault structures, influencing groundwater movement. The findings suggest that groundwater sources in the study area are unevenly distributed, requiring site-specific extraction strategies. The study provides an aquifer depth distribution map, offering critical insights for future groundwater management and well-drillin.
Analysis of Liquefaction Potential in The Youtefa Bay Area, Jayapura City Emilyano Joel O. Wayangkau; Duha Awaluddin Kurniatullah; Dewi Ana Rusim; Alfian Adie Chandra; Helen Gianditha Wayangkau
Jurnal Indonesia Sosial Teknologi Vol. 5 No. 12 (2024): Jurnal Indonesia Sosial Teknologi
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jist.v5i12.8831

Abstract

The distribution of soil in Jayapura City, especially the Youtefa Bay area, consists of three dominant soil types that then form the stratigraphy of the local soil layer, namely allifial deposits, silt silt/silt clay, and fine, uniformly grained sand. Soil conditions like this have great potential for liquefaction, especially since this area is mostly passed by fault lines that have the potential to cause earthquakes. The groundwater table factor that is very close to the surface soil is also an important factor in the occurrence of liquifaction. There are 2 ways to analyze the potential for liquifaction, namely by laboratory test and from field test data. The approach to calculating field test data is CPT (Cone Penetration Test) testing. The results obtained were the Cyclic Stress Ratio (CSR) value and the Cyclic Resistance Ratio (CRR) value obtained by simulating seismic data using an earthquake strength of 6.5 on the riter scale and a pic ground acceleration value (0.3), then based on the results of the cone penetration test (CPT)/Sondir showed a maximum value of CRR 2.88, a minimum value of 0.21, a maximum CSR value of 3.70, a minimum value of 2.25. The maximum value of FS is 0.97, the minimum value is 0.07. There are 6 points at the research location that have the potential for liquefaction (Very High), namely points S1, S2, S5, S7, S8, S10, while 3 points with medium potential (High), namely points S3, S4, S9 for those with low potential (Low) S6.
Evaluasi Sistem Drainase Perkotaan dengan Model Simulasi SWMM pada Kawasan Padat Penduduk Helen Gianditha Wayangkau; Raymond Feril Hattu
Jurnal Studi dan Aplikasi Teknik Sipil (JSATS) Vol. 1 No. 1 (2025): Ferbruari
Publisher : Marasofi International Media and Publishing (MIMP)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64123/jsats.v1.i1.2

Abstract

Permasalahan genangan air dan banjir perkotaan menjadi isu kritis pada kawasan padat penduduk, terutama di daerah dengan sistem drainase yang kurang optimal. Salah satu pendekatan yang banyak digunakan dalam analisis sistem drainase modern adalah pemodelan dengan Storm Water Management Model (SWMM) yang mampu mensimulasikan aliran permukaan dan kapasitas saluran drainase berdasarkan data hidrologi dan geometri jaringan. Penelitian ini bertujuan mengevaluasi kinerja sistem drainase di salah satu kawasan padat penduduk di Kota Medan menggunakan model SWMM 5.1. Data curah hujan, topografi, kondisi saluran eksisting, serta tata guna lahan digunakan sebagai input dalam model. Kalibrasi model dilakukan dengan membandingkan hasil simulasi terhadap kejadian genangan aktual di lapangan. Hasil simulasi menunjukkan bahwa kapasitas saluran pada beberapa titik tidak mencukupi untuk menampung debit limpasan puncak, terutama pada curah hujan dengan periode ulang 2 dan 5 tahun. Beberapa alternatif perbaikan seperti pelebaran saluran, pembuatan kolam retensi, dan penerapan sistem resapan lokal dianalisis untuk menurunkan debit limpasan dan mengurangi risiko banjir. Penelitian ini memberikan dasar teknis dan rekomendasi perencanaan ulang sistem drainase di kawasan perkotaan padat penduduk agar lebih adaptif terhadap intensitas hujan ekstrem. 
Co-Authors Abda Abda Agung Saputra Ahmad Gifary Alfian Adie Chandra Alfian Adie Chandra Alfrendy Lolopayung Amaliah Azis Annisa Novita Sari Bahtiar Bahtiar Bernathius Julison David David David Mangallo Davy Ivan Robert Jansen Dualembang, Hery Duha Awaluddin Kurniatullah Emilyano Joel O. Wayangkau Enjelo Sio’ Fandy Novrian Mangeke Ivanka Thamara Victorya Bannegau, Rivelya Marthen Liga Mujiati Mujiati Patrick Fandy Purwoko, Agus Rahmat Tatayo Lie Raymond Feril Hattu Robert Frans Horik Roberth Frans Horik Rusim, Dewi Ana Safanpo, Apolo Theresia Wuri Wika Matana Nion