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All Journal IJOG : Indonesian Journal on Geoscience Journal of Degraded and Mining Lands Management Journal of Geography Science and Education
Mutaqin, Bachtiar Wahyu
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Environmental Science Social Sciences

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Dynamics of the aeolian landform at the coastal geosite of Parangtritis sand dune area, Yogyakarta Malawani, Mukhamad Ngainul; Mardiatno, Djati; Mutaqin, Bachtiar Wahyu; Suhendro, Indranova; Setiawan, Nicky; Muharram, Fajrun Wahidil; Rhosadi , Iwan
Journal of Degraded and Mining Lands Management Vol. 11 No. 3 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.113.5839

Abstract

In 2014, Kelud, an active volcano in East Java, ejected ashes (hereafter termed KA; Kelud ash) that reportedly reached as far as Central Java and the Special Region of Yogyakarta (DIY). The KA deposits are observable in, among others, the coastal sand dune area in Parangtritis. Due to the active aeolian process, the KA layers can be found at different depths five years after the eruption. Thus, the KA can be used as a marker of the post-2014 aeolian activities at the Parangtritis dune, which was once classified as a degraded land and later recognized as a coastal geosite, ultimately allowing us to calculate the volume and sand transport rate. The research surveys performed at 25 points discovered volcanic ash layers at 1 cm to 26 cm below the surface. At some observed points, the ash deposits were found on the surface and continuously transported. This research observed an area of 60,000 m2 with an average of 8.5 cm thick sand layers lying above the KA layer. Based on the calculation, the total volume of the transported sand at the Parangtritis sand dune from 2014 to 2019 was approximately 5,100 m3. This volume is considerably small owing to various obstacles in the transport zones. Based on the five-year dynamic of the sand dune, this study suggested that restoration needs to be conducted immediately particularly in eliminating vegetation barriers to maintain the sediment balance (erosion-transport-sedimentation) of the coastal sand dune area.
Review on the Impacts of the Samalas Eruption (1257 CE) to the Hydrogeological Conditions of Mataram, Lombok, Indonesia Malawani, Mukhamad Ngainul; Hadmoko, Danang Sri; Lavigne, Franck; Agniy, Romza Fauzan; Hayat, Dimas Maula; Astabella, Relinda Dewi; Laksono, Agung; Syamsuddin, Syamsuddin; Mutaqin, Bachtiar Wahyu
Indonesian Journal on Geoscience Vol. 11 No. 3 (2024)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.11.3.339-348

Abstract

This paper examines the local impacts of the 1257 CE Samalas eruption in the Mataram plain in relation to the hydrogeological conditions. Data from several previous studies in the Mataram plain is summarized and then reinterpreted. Data collected from new fieldwork is also presented. This review summarizes hydrogeological conditions into several categories, i.e. stratigraphy, aquifer formation, groundwater quality, and evolution. Two coring data were evaluated, which showed that Mataram plain has a relatively thick alluvial layer with a dominant material of sand mixed with pumice from the reworked deposit of the 1257 CE Samalas eruption. The sediment from this eruption formed a freshwater aquifer layer up to ~18 m deep. Using resistivity data, the aquifer layers in the studied area were characterized as unconfined aquifer, aquitard, and semi-unconfined aquifer. Seven water samples show that the groundwater in the studied area is in good condition, which indicates the bicarbonate water type. The results of the analysis show that the impact of the 1257 CE Samalas eruption on the hydrogeology of Mataram is considered a positive impact, i.e. forming an unconfined aquifer containing freshwater that is good for domestic uses.
Identification and Classification of Anthropogenic Landform in Parangtritis Hills Landscape Dwi Putra, Boma Karunia; Setiawan, Muhammad Anggri; Mutaqin, Bachtiar Wahyu
Journal of Geography Science and Education Vol. 6 No. 2 (2024): October
Publisher : Universitas Veteran Bangun Nusantara

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Abstract

Human activities alter the Earth's morphology into anthropogenic landforms, both in urban and rural areas, including Desa Parangtritis. These interventions create new characteristics in the landscape, such as pseudourban formations on plains and morphological changes in hills, posing environmental risks if not managed properly. This study uses a comparative descriptive spatial analysis method, comparing variations between anthropogenic and natural landforms. Digital Elevation Model (DEM) data and orthophoto were utilized to delineate and identify anthropogenic landforms. The results indicate that the hillsides in Desa Parangtritis are divided into structural and solutional landforms, each with varying levels of human intervention. The solutional landform falls under a "Slightly Modified Landscape" phase, while the structural landform has undergone significant anthropogenic intervention. Agrogenic land use dominates, with mixed gardens and fields as primary uses, while urbanogenic and traffic interventions are closely related to infrastructure development. The transformation of hills into anthropogenic landforms in Parangtritis reveals a strong human influence, not only forming pseudoterraces for agriculture but also altering land configuration through excavation and leveling, thus placing it in a "semi-natural landscape" phase. These interventions increase the risks of erosion and landslides and reduce infiltration capacity. The study demonstrates that landform changes due to anthropogenic intervention in the hills of Desa Parangtritis require careful conservation planning to protect the environment and minimize the negative impacts of human activities in the area.
Co-Authors Agniy, Romza Fauzan Astabella, Relinda Dewi Danang Sri Hadmoko Djati Mardiatno Dwi Putra, Boma Karunia Franck Lavigne, Franck Hayat, Dimas Maula Laksono, Agung Malawani, Mukhamad Ngainul Muharram, Fajrun Wahidil Rhosadi , Iwan Setiawan, Muhammad Anggri Setiawan, Nicky Suhendro, Indranova Syamsuddin Syamsuddin