Decreasing groundwater quality at Cisadane riverbanks: groundwater-surface water approach

The decreasing of groundwater quality has been the major issue in Tangerang area. One of the key process is the interaction between groundwater and Cisadane river water, which flows over volcanic deposits of Bojongmanik Fm, Genteng Fm, Tuf Banten, and Alluvial Fan. The objective of this study is to unravel such interactions based on the potentiometric mapping in the riverbank. We had 60 stop sites along the riverbank for groundwater and river water level observations, and chemical measurements (TDS, EC, temp, and pH). Three river water gauge were also analyzed to see the fluctuations. We identified three types of hydrodynamic relationships with fairly low flow gradients: effluent flow at Segmen I (Kranggan - Batuceper) with 0.2-0.25 gradient, perched flow at Segmen II (Batuceper-Kalibaru) with gradient 0.2-0.25, and influent flow at Segmen III (Kalibaru-Tanjungburung) with gradient 0.15-0.20. Such low flow gradient is controlled by the moderate to low morphological slope in the area. The gaining and losing stream model were also supported by the river water fluctuation data. TDS and EC readings increased more than 40$\%$ from upstream to downstream. At some points the both measurements were two times higher than the permissible limits, along with the drops of pH values at those areas. This study shows the very close interaction between Cisadane river water and groundwater in the riverbank. Therefore the authorities need to be managed the areas with a very strict regulations related to the small and large scale industries located near by the river.Comment: 8 pages, 6 figures, have been presented in Asian Physics Symposium in Indonesia 2015 and will be published in IOP Conference Serie

Forecasting of Using Electricity Consumption at ITERA (Institut Teknologi Sumatera) until 2025, to Improve Application of Renewable Energy in Lampung Province

Institut Teknologi Sumatera (ITERA) is a new campus located in Lampung province- Indonesia. It is almost 6 years old, within large data on the total population human activity in this 275-hectare campus around 9500 persons, so that necessary to forecasting energy demand in the future, ITERA can project programs that are in line with the Indonesian government, specifically increasing using of renewable energy. which the government has a national energy policy in 2025 of 23%. Mostly in Lampung province, the electricity produced is still dominated by fossil energy (e.g., coal, diesel, etc), therefore as a campus with a technological background, ITERA must be able to bring a paradigm shift to be used from electricity consumption in the surrounding areas. The results of this study will project electricity usage in ITERA over the next 5 year, where electricity usage in ITERA 2019 is 2.472 GWh or 6,775 KWh/day, expected with a development strategy to implementing the efficiency of green energy, so that can meet the challenges of reducing CO2 emissions and energy-saving behavior, also keep sustainable impact for Indonesia

Variasi Nilai Gradien Hidrolik dan Pengaruhnya terhadap Perubahan Nilai Tahanan Jenis pada Sistem Akifer Bersudut Berdasarkan Pendekatan Model Fisik

The core of this research is simulation on a physical model of inclined confined aquifer in laboratory scale. The model dimensions is 79.50 cm long, 78.00 cm wide, and 10.00 cm tall. The aquifer is simulated as single confined aquifer with thickness of 8 cm. The aquifer material is composed of coarse sand with good gradation and has uniformity coefficient of 7.105. The measurements consist of elevation head (z), pressure head (hp), total head (h), and resistivity with Schlumberger configuration. The confined aquifer layer is set up to be horizontal. Then, in order to get the hydraulic gradient and dip layer variations, the position of the model box is inclined with varied degree of: 00, 100, 200, and 270. To get the most representative result, the resistivity is measured with line spread parallel to strike and perpendicular to strike.The analysis shows that the increase of the hydraulic gradient (i) have the tendency to cause the decrease of true resistivity values (Ï). Based on the line spread direction and R2 values, there are 2 representatives equations as follows: 1). With line spread parallel to strike:4,88ln()64,60Ï=−+i;R2=0,95. 2). With line spread perpendicular to strike without correction on AB/2 and K value:Ï=;R3,80ln()58,20−+i2=0,99

The Carbon Footprint Estimation based on Campus Activities in ITERA (Institut Teknologi Sumatera)

ITERA (Institut Teknologi Sumatera) is one of young university situated in Lampung Province, Indonesia. In 2018, the average population of campus (students, faculties, and staff) was about 9584 persons. The objective of this paper is to inventory Green House Gasses (GHGs) and then to calculate carbon footprint using equation by UI Greenmetric Guideline 2018 except for fuel and LPG consumption, paper use, and organic waste generation by using GHGs Protocol. Three scopes of GHGs emission were used to classify based on both direct and indirect source(s). The first scope was presented by LPG consumption and fuel consumption of campus’s car. Electricity consumption became scope 2 while the scope 3 involved paper use, organic waste generation including food waste and Yard trimmings, and transportation activities of both motorcycles and cars. The estimated GHGs emission was about 2846.541 metric ton CO2eq during 2018-2019 (one year) with the portion of each scope resulting 10.2%, 62%, and 28.2%, respectively. Electricity usage was being the highest contributor of carbon footprint. The inventory of GHGs will help top management of campus to evaluate and determine some strategies for minimization, reduction, and mitigation notably in electricity sector by some strategies such as substituting electric devices into eco-friendly products, applying energy management ISO 50001, and others

Identifikasi Kondisi Geologi dan Kualitas Airtanah di Desa Pelauw, Kecamatan Pulau Haruku, Kabupaten Maluku Tengah

Pemenuhan kebutuhan air di Desa Pelauw sebagian besar bergantung pada air sungai dan airtanah. Namun ada sebagian masyarakat di Desa Pelauw kesulitan mendapatkan sumber air, sebab beberapa sumur gali memiliki sifat fisik payau. Oleh karena itu, penelitian ini bertujuan untuk mengidentifikasi kondisi geologi dan kualitas airtanah di Desa Pelauw, Kecamatan Pulau Haruku. Metode yang digunakan adalah interpretasi kondisi geologi, dan parameter fisik-kimia airtanah. Selanjutnya dilakukan klasifikasi nilai tiap parameter. Hasil penelitian menunjukkan bahwa Daerah penelitian di Desa Pelauw berada pada Satuan Endapan Aluvium (Qa), Batugamping Koral (Ql), dan Batuan Gunungapi Ambon (Tpav). Sistem hidrogeologi Desa Pelauw memiliki akuifer produktivitas sedang, akuifer produktivitas tinggi-sedang, dan akuifer produktif dengan pola aliran airtanah mengalir dari arah selatan ke utara dan intensitas curah hujan menengah. Kualitas air berdasarkan Permenkes No. 492 Tahun 2010 memiliki kondisi air tawar dengan nilai EC (138-1953 µs/cm), TDS (64-872 ppm), dan salinitas (0-2,84%), kondisi air payau dengan nilai EC (2072-2712 µs/cm), TDS (1.342-2.474 ppm), dan salinitas (4,04-5,42%), pH air layak minum dengan nilai 7,30-8,42 dan pH basa pada 8,63-8,56. Sampel airtanah pada pada daerah penelitian berasal dari adanya interaksi antara air dengan material penyusun akuifer

Analisis Kesesuaian Lahan Kawasan Permukiman dan Pertanian Ubi Kayu Berdasarkan Aspek Geologi Lingkungan di Kecamatan Teluk Ambon Baguala

Luas lahan permukiman dan pertanian semakin mengecil seiring dengan laju pertumbuhan penduduk, namun ketersediaan lahan terbatas. Perencanaan yang baik diperlukan untuk menghindari alih fungsi lahan dan memaksimalkan potensi lahan. Kecamatan Teluk Ambon Baguala mengalami laju pertumbuhan penduduk sebesar 0,72% per tahun 2010 – 2020, memiliki perencanaan pengembangan kawasan permukiman dan pertanian ubi kayu, serta potensi sumber daya dan bencana geologi. Oleh karena itu, diperlukan analisis kesesuaian lahan untuk kawasan permukiman dan pertanian ubi kayu berdasarkan aspek geologi lingkungan pada daerah tersebut. Metode SMCE (Spatial Multi-Criteria Evaluation) digunakan untuk menganalisis kesesuaian lahan. Berdasarkan analisis SMCE, kawasan permukiman terdiri dari empat kelas kesesuaian lahan, yaitu sangat sesuai (8,6%), cukup sesuai (23,5%), sesuai marginal (23,9%), dan tidak sesuai (41,6%) dengan luas kelas lahan sesuai 1977,15 ha dan lahan tidak sesuai 1625,15 ha. Kawasan pertanian ubi kayu terdiri dari empat kelas kesesuaian lahan, yaitu sangat sesuai (7,3%), cukup sesuai (6,1%), sesuai marginal (25,3%), dan tidak sesuai (19,7%) dengan luas kelas lahan sesuai 827,51 ha dan lahan tidak sesuai 2774,79 ha. Berdasarkan analisis prioritas kawasan, maka luas kawasan permukiman 1894,53 ha dan kawasan pertanian ubi kayu 221,98 ha

Era baru publikasi di Indonesia: status jurnal open access di Directory of Open Access Journal (DOAJ)

Introduction. The quality of journals in Indonesia is much criticized; however, the number of Indonesian journals that meet the criteria of Directory of Open Access Journal (DOAJ) is quite a lot. This study describes some facts of Indonesia’s publications based on DOAJ and World Bank data.Data Collection Method. Some filtering processes in DOAJ database were done based on sum of journals, scientific fields distribution, and Article Processing Charge (APC). Open data regarding research funds among countries in World Bank database were analyzed.Data Analysis. This study used quantitative-descriptive design with frequency analysis technique. Data visualization was done with R Statistical Computing and Google Sheets.Results and Discussions. In March 2017, there were 500 Indonesian journals (5th rank worldwide); 420 of them were in Indonesian covering more than 51,000 articles (7th rank). The top three fields were: education, Islam religion, as well as business and commerce. As much as 70% of the journals were free of APC. Science must prioritize inclusiveness and equality inline with the principles of originality and honesty.Conclusions. This study concludes that open access journals in Indonesia improves the accessibility, quality, and relevance of Indonesian research, which can be reused by communities, industries, and the government

Differenciation hydrochimique et isotopique des emergences karstiques du Languedoc-Roussillon (France)

SIGLEAvailable from INIST (FR), Document Supply Service, under shelf-number : T 79051 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

HIDROGEOLOGI Teori, Praktik, dan Percontohan Problematika

Hidrogeologi adalah ilmu multidisipliner yang mempelajari air dan fenomenanya yang berada di bawah permukaan bumi (subsurface water) atau yang dikenal secara umum yaitu air tanah, berbasiskan sistem akifer dalam suatu cekungan air tanah, dengan dua dasar keilmuan utama yaitu geologi dan hidrologi.Buku hidrogeologi ini merupakan buah karya penulis yang disempurnakan dari edisi pertama pada tahun 2004 dengan tambahan pembaruan penulisan dan studi kasus, serta merupakan buku rujukan hidrogeologi yang masih langka di Indonesia. Buku ini berisi delapan bagian dilengkapi dengan pengalaman kepakaran penulis dan contoh aplikasinya yang dibagi kedalam delapan bagian dan sebelas bab. Kedelapan bagian tersebut adalah: pertama: hal umum tentang hidrogeologi dalam kerangka siklus hidrologi; kedua: interaksinya dengan air tanah yang meliputi air hujan dan air permukaan; ketiga: tipologi sistem akifer dan berbagai parameter hidroliknya; keempat: teknologi eksplorasi permukaan dan bawah permukaan yang meliputi eksplorasi hidrogeologi dan pemetaan; kelima: teknik eksploitasi yang meliputi teknologi pemboran dan konstruksi sumur bor; keenam: hidrodinamika dan dasar-dasar simulasi aliran air tanah; ketujuh: analisis fisika dan kimiawi, kualitas dan polusi yang meliputi kimia air tanah, fenomena dispersi dan polusi air tanah; kedelapan: paradigma baru manajemen air tanah berbasis akifer dan pemanfaatan sistem informasi yang dikenal dengan HyGiS (Hydro Geoinformation System), dan perundang-undangan.Buku hidrogeologi ini secara khusus digunakan untuk membangun komunitas ilmuwan dan praktisi dalam bidang hidrogeologi, serta bagi mereka yang berkeinginan mempelajari, mendalami dan mengaplikasikan sains, teknologi, manajemen, dan tata kelola air tanah serta pemanfaatannya bagi kesejahteraan masyarakat dan pengelolaan air tanah berbasis sistem hidrogeologi.</p

Materi Kuliah Geologi Lingkungan 2021

Kumpulan Materi Kuliah Geologi Lingkungan 202