Asep Mulyono

Indonesian Institute of Sciences

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Yudi Rahayudin

Institute of Mining

Anna Fadliah Rusydi

National Research and Innovation Agency

Rizka Maria

National Research and Innovation Agency

Ida Narulita

National Research and Innovation Agency

Yayat Sudrajat

National Research and Innovation Agency

J J Carrilo-Rivera

Universidad Nacional Autónoma de México

Muhammad Rahman Djuwansah

Indonesian Institute of Sciences

Eki Naidania Dida

National Research and Innovation Agency

Edi Hidayat

Padjadjaran University

Dyah Marganingrum

National Research and Innovation Agency

Cooperative Institutions

National Research and Innovation Agency

Indonesian Institute of Sciences

National Nuclear Energy Agency of Indonesia

Padjadjaran University

Bandung Institute of Technology

National Student Clearinghouse Research Center

Center of Research and Technologic Development in Electrochemistry

Meteorological, Climatological, And Geophysical Agency

Kyoto University

Badan Pusat Statistik

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Determining of soil resistivity by electrical resistivity tomography in agroforestry land system

IOP Conference Series Earth and Environmental Science (2019)

Asep Mulyono Ilham Arisbaya Yayat Sudrajat Muhamad Rahman Djuwansah Abraham Suriadikusumah

The study of soil hydrological characteristics is expensive and time-consuming due to its exercises drilling, test pit, and even trenching. The electrical resistivity tomography (ERT) technique is known as one of the viable methods for determining soil resistivity as a proxy for soil water content. The research has been done in three resistivity lines at the sloping agroforestry land system in West Java province-Indonesia. Soil resistivity value in the Pangalengan line transect ranges from 4.3-2500 Ω, Mandalahaji line transect ranges from 23-288 Ω, and Kiara Payung line transect ranges from 24-500 Ω. Soil resistivity under the agroforestry land system was higher than non-agroforestry land. Soil resistivity is firmly related to the soil water content with an inverse pattern. The use of woody tree species as a water absorber in the agroforestry farming system was the potential to prevents rapid soil saturation and maintain the stability of the steep area. In the steep area, the saturated condition decreases soil shear strength and increases the load on the upper slope so that it triggers soil mass movement.

Electrical Resistivity Tomography

Soil resistivity

Soil morphology

10.1088/1755-1315/393/1/012063

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Environmental Impact of Land-use Changes and Soil Loss on Coastal Coral Reef Cover: Study Case in the Small Tropical Island, Indonesia

Research Square (Research Square) (2021)

Asep Mulyono Muhammad Rahman Djuwansah Ida Narulita Risandi Dwirama Putra Dewi Surinati

Abstract Over 24% of coral reefs in Southeast Asia, including Indonesia, experience damage from development in coastal areas by coastal construction, land conversion, beach nourishment, and port construction. The rapid economic development activities around the coast of Bintan Island impact the extraction of natural resources and reduction of the coral reefs cover. A comprehensive study to determine the temporal change in land use and estimate the rate of soil loss and its effects on coral reef cover is needed. There has been a change in land use for five years (2014-2018) on the east coast of Bintan Island, and the average percentage of coral reef cover is in the fair category (<50%). The land-use changes have resulted in soil loss that varies each year. Apart from land-use changes, the factor of rainfall is one of the causes of soil loss. Soil loss is generated from cultivated lands due to the lack of conservation techniques. In east Bintan island, mixed garden, plantation, and bare land area with dense canopy cover contributed increasing of soil loss. The contribution of soil loss to hard coral reefs as a result of land use changes from high to low is soil erosion > soil sediment > surface run-off.

Land Cover

10.21203/rs.3.rs-148449/v1

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Variations of springs water conductivity the selected springs at the flank of Mount Rajabasa, Lampung

IOP Conference Series Earth and Environmental Science (2021)

Hendra Bakti RF Lubis A Purwaarminta Dady Sukmayadi Wahyu Purwoko

Abstract Continuous Electrical conductivity (EC) monitoring has been carried out on springs in the lower slopes of The Mount Rajabasa. The research is intended to find the variation of EC in volcanic springs as a signal to understand groundwater flow regimes. Data evaluation makes use of frequency distribution from statistical methods. The results give clear information for each character of the spring measured at the research site.

Mount

Flank

10.1088/1755-1315/789/1/012043

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Assessment of silica-enriched biochar for enhancing soil fertility and mitigating methane emissions in acid-stressed rice fields

Journal of Ecological Engineering (2025)

Emma Trinurani Sofyan Ania Citraresmini Dyah Marganingrum Asep Mulyono Rahman Djuwansah

Methane Emissions

Paddy field

10.12911/22998993/199823

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Karakteristik Fisik Tanah Longsoran di Jalur Transek Liwa-Bukit Kemuning, Lampung Barat

Jurnal Lingkungan dan Bencana Geologi (2015)

Asep Mulyono Prahara Iqbal

ABSTRAK Jalur transek Liwa–Bukit Kemuning merupakan akses jalan utama menuju beberapa wilayah di Sumatra Selatan, Bengkulu, dan wilayah lainnya di Sumatra. Longsor di lereng sepanjang jalur ini sering terjadi yang mengakibatkan jalan terputus. Penelitian ini bertujuan untuk memetakan sebaran titik potensi longsoran dan mengetahui karakteristik fisik tanah di zona longsoran. Identifikasi ini diharapkan dapat menambah data kebencanaan daerah serta rekomendasi guna peningkatan kewaspadaan terhadap bencana longsoran di sepanjang jalur lintas barat. Longsoran pada jalur transek Liwa-Bukit Kemuning teramati sebanyak empat titik lokasi dan yang berpotensi untuk terjadi longsoran teramati sebanyak dua puluh sembilan titik lokasi. Longsoran terjadi pada Formasi Hulusimpang sebanyak satu lokasi, pada Formasi Ranau sebanyak satu lokasi, dan dua lokasi pada Formasi Gunung Api Kuarter. Karakteristik tanah di jalur transek Liwa-Bukit Kemuning menunjukkan tingkat kompresibilitas pasir halus dan plastisitas tanah lanau yang tinggi dan tergolong pada pasir halus diatomae serta lanau anorganik dengan batas plastis lebih dari 50%. Jenis tanah di daerah ini sangat umum berupa hasil pelapukan material vulkanik dan endapan abu vulkanik. Tipe tanah tersebut rentan terhadap kenaikan tekanan air pori dan perubahan sifat fisik sebagai penyebab faktor utama pemicu terjadinya longsoran.Untuk mengurangi terjadinya longsoran di jalur transek Liwa-Bukit Kemuning diperlukan perbaikan pada proses pemotongan lereng jalan agar lebih landai, penanaman tanaman penutup tanah untuk mengurangi erosi dan jaringan drainase serta mengoptimalkan bronjong atau dinding penahan lereng. Kata Kunci: Longsoran, pemetaan, Jalur transek Liwa – Kemuning, Sumatra. ABSTRACT Liwa-Bukit Kemuning transect road is an access point to some regions in Sumatra main roads such as South Sumatra, Bengkulu, and other regions located in Sumatra. Landslide occurrence on the slopes along the roads often resulted in access disconnecting. This study aims to map the distribution of landslide potential and knowing the soil/rock landslide zone physical properties. This identification is expected to add the disaster data/information and public awareness along the roads. Landslide events at the Liwa - Bukit Kemuning transect road are observed in four locations and there are twenty nine potential locations. Landslide occured in one location at Hulusimpang Formation, one location at Ranau Formation, and two locations at Quaternary Volcanic Formation. The characteristics of the Liwa-Bukit Kemuning transect road soil indicates the level of high soil compressibility and plasticity. This soil is classified as diatomaceous fine sand and inorganic silt with plastic limit of more than 50%. The type of soil in this area is very common as the result of weathering volcanic material and deposition of volcanic ash. The soil types are prone to rise in pore water pressure and changes in physical properties as the main factor for triggering the occurrence of landslide. Efforts to reduce the occurrence of landslide at the Liwa-Bukit Kemuning transect road are gentle slope cutting, planting cover crops to reduce erosion and to optimize the gabion or retaining wall. Keywords: Landslide, mapping, Liwa - Kemuning transect road, Sumatra.

10.34126/jlbg.v6i1.72

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Application of Climate Hazards Group InfraRed Precipitation with Station (CHIRPS) satellite data for drought mitigation in Bintan island, Indonesia

IOP Conference Series Earth and Environmental Science (2021)

Ida Narulita Faiz Rohman Fajary Asep Mulyono Eko Kusratmoko Muhamad Rahman Djuwansah

Abstract The water resources of Bintan Island is limited and dependent on rainfall variability. The exposed location of Bintan small island make this island particularly vulnerable to natural disaster expecially drought. The meteorological drought related information is required for the water resources management of Bintan island. This article provides calibration of CHIRPS data. The ground-based rainfall observation data is used for CHIRPS data calibration. The Drought analysis used CHIRPS rainfall data, and ground-based observation data was carried out using the Standardized Precipitation Index (SPI). The results showed that the data set performed well in assessing drought years (1982, 1997, and 2015). The statistical Z test results showed that the CHIRPS data and ground-based observation data were not showing significantly different values. This study concludes that CHIRPS data is valuable for drought monitoring tools in Bintan island, where the ground-based observation rainfall data is very limited.

Ground station

Data set

10.1088/1755-1315/789/1/012052

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Groundwater nitrogen concentration changes in an urbanized area of Indonesia over ten years period

IOP Conference Series Earth and Environmental Science (2023)

Anna Fadliah Rusydi Tedy Setiawan Rizka Maria F Firmansyah Ratna Damayanti

Abstract Nitrogen in groundwater poses environmental concerns in Bandung Region, Indonesia, due to natural and anthropogenic factors. The predominant component of the region’s aquifer is high-hydraulic-conductivity volcanic rock, one of the natural vital factors that make the aquifer vulnerable to contamination. Another factor is urbanization which has been reported to be an adverse effect of high nitrogen levels in the groundwater, particularly the unconfined system. This study’s objective was to evaluate urbanization’s impact on dissolved inorganic nitrogen concentrations over a 10-year period, which had not been explained by previous research. The evaluation focused on land-use changes in the southern part of the Bandung Region and their relation to dissolved inorganic nitrogen (DIN) in unconfined groundwater. A total of 88 samples were collected in 2009, 2015, and 2018 from three types of land-use: residential, plantations, and paddy fields. From 2009 to 2018, land use changes were visible, with an 8% and 6% increase in urban settlements and rice fields, respectively, and a 15% reduction in plantations. Furthermore, over a decade, agricultural and rice fields substantially impacted the NO 3 − levels, contributing approximately 13.2 mg/L and 9.9 mg/L, respectively. In the meantime, the settlement area significantly contributed to the 3.25 mg/L increase in the NH 4 + levels.

Human settlement

10.1088/1755-1315/1201/1/012035

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Evaluation of land use and geological effect on groundwater characteristics in Bandung metropolitan using a hydrochemical and statistical approach

IOP Conference Series Earth and Environmental Science (2024)

Dadi Mulyadi Nugraha M R Aulia Mohamad Rangga Sururi Yudi Rahayudin Z B Utami

Abstract Groundwater is often used as clean water since it requires less water treatment. However, the quality will depend on the environmental conditions and human activities. Our research is conducted in Bandung Metropolitan, an urbanized area where groundwater is preferable, but the quality is becoming concerning. The objective of this study is to determine whether natural or human activities have a greater impact on groundwater quality. A total of 113 samples were collected from nine geological conditions spanning three primary land use types. The samples were analyzed for seven major ions (Na + , K + , Ca 2+ , Mg 2+ , HCO 3 − , SO 4 2 − , and Cl − ), which occur naturally in natural water but may be elevated due to human activities. Based on the Piper diagram, fifty-three samples are categorized as Ca-HCO 3 , with the dominant cation being Ca 2+ and the dominant anion being HCO 3 − . Furthermore, the multivariate statistical analysis reveals that 74% of all ions are related to geological conditions and anthropogenic activities. In detail, high contents of Ca 2+ , as the dominant cation, are significantly correlated by all land uses and most geological formations. In addition, cation contents were significantly correlated with land uses, but the correlation varied for each type of geological formation. All land uses surely correlate with all major ions, but the geology depends on the type of formation.

10.1088/1755-1315/1388/1/012062

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Potentially toxic elements contamination in the water resources: an integrated risk assessment approach in the upper Citarum watershed area

Environmental Geochemistry and Health (2024)

Ratna Dwi Puji Astuti Rizka Maria Heri Nurohman Riostantieka Mayandari Shoedarto Anna Fadliah Rusydi

10.1007/s10653-023-01818-y

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Appraisal of active tectonics in Karangsambung Amphitheater: Insights from DEM-derived geomorphic indices and geological data

IOP Conference Series Earth and Environmental Science (2024)

Edi Hidayat Dicky Muslim Dimas Aryo Wibowo Eko Puswanto Sonny Aribowo

Abstract The morphology of the Karangsambung area shows a unique form, namely the morphology of the amphitheater. This area results from the complexity of tectonic, erosion, and depositional processes. The active tectonics in this region greatly influence the drainage system and geomorphic expression. The study area provides evidence of subduction in Java. It is an ideal natural laboratory for studying evidence of tectonic activity due to the subduction of the Indo-Australian plate with the Eurasian plate during the Cretaceous period. We evaluated active tectonics using the DEM to assess the characteristics of the geomorphic index. The results obtained from these indices were combined to produce an index of relative active tectonics (IRAT) using GIS. The average of the seven geomorphic indices measured was used to evaluate the distribution of relative tectonic activity in the study area. We defined four classes to determine the relative level of tectonic activity: class 1: very high (1.0 ≤ IRAT < 1.5); class 2: high (1.5 ≥ IRAT < 2); grade 3: moderate (2 ≥ IRAT < 2.5); and grade 4: low (2.5 ≥ IRAT). The results show that the study area was strongly deformed and was influenced by tectonic activity. Landsat imagery, DEM, and field observations also proved the presence of active tectonics in the form of uplift accompanied by high vertical erosion forming pointed hills with narrow valleys, the exposure of Cretaceous-aged rocks, amphitheater morphology, and the uplift of river terraces. The indicative IRAT values were consistent with the relative uplift levels, landforms, and geology.

Landform

Tectonic uplift

10.1088/1755-1315/1314/1/012092

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Citations (2)