Article Per Year (5 Year)
p-Index From 2020 - 2025
0.444
P-Index
This Author published in this journals
All Journal Indonesian Journal of Geography JPG (Jurnal Pendidikan Geografi) JURNAL ENGGANO
Bachtiar Wahyu Mutaqin
Kelompok Studi Kepesisiran dan DAS, Fakultas Geografi Universitas Gadjah Mada, Sekip Utara, Bulaksumur 55281 Yogyakarta
Earth & Planetary Sciences Education Other

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Topography and structural changes of Anak Krakatau due to the December 2018 catastrophic events Herlan Darmawan; Bachtiar Wahyu Mutaqin; Wahyudi Wahyudi; Agung Harijoko; Haryo Edi Wibowo; Nia Haerani; Mamay Surmayadi; Syarifudin Syarifudin; Raditya Jati; Suratman Suratman; Wikanti Asriningrum
Indonesian Journal of Geography Vol 52, No 3 (2020): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.53740

Abstract

The flank collapse of Anak Krakatau on 22 December 2018 caused massive topography losses that generated a devastating tsunami in Sunda Strait, which then followed by eruptions that progressively changed the topography and structure of Anak Krakatau. Here, we investigated topography and structural changes due to the December 2018 flank collapse and the following eruptions by using high resolution Digital Elevation Model (DEM) before and after the events and sentinel 1A satellite image post-flank collapsed. Results show that the volumetric losses due to the 22 December 2018 flank collapsed is ~127 x 106 m3, while the following eruptions caused ~0,8 x 106 m3 losses. Structural investigation suggests two structures that may act as failure planes. The first structure is located at the western part of volcanic edifice that associated with hydrothermal alteration and the second failure is an old crater rim which delineated an actively deform volcanic cone.
Analisis Geomorfologi dan Oseanografi untuk Identifikasi Tipologi Pulau Kecil: Studi Kasus di Kepulauan Maluku Utara dan Karimunjawa Bachtiar Wahyu Mutaqin; Diki A. Amanatulloh; Taufik Budi Waskita; Muh Aris Marfai; Muhammad Nadafa Isnain; Mulyadi Alwi; M. Rokhis Khomarudin
JPG (Jurnal Pendidikan Geografi) Vol 9, No 1 (2022)
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jpg.v9i1.12459

Abstract

AbstractSmall islands in Indonesia have a vital role in developing social, economic, cultural, environmental, and national sovereignty. On the other hand, small islands are also very vulnerable to natural disasters and dynamics and/or human activities. Threats and disasters that exist on small islands can vary according to the characteristics and typology of the island. This study aims to identify the typology of small islands by utilizing geospatial data to analyze geomorphological parameters, including morphology, materials, processes, and oceanographic parameters such as the presence of coral reef ecosystems. The method in this research is divided into three stages, namely pre-field, field measurement, and post-field. Pre-field activities include formulating the characteristics of each island typology through literature studies and geospatial processing data, such as DEM and SPOT 7 satellite imagery, for the preparation of thematic maps. The field stage includes terrestrial surveys in the form of aerial photography, profiling, validation of interpretation results, and diving. The post-field step is carried out to process and analyze the results of the terrestrial survey conducted at the field stage. The analysis was carried out descriptively based on the results of data processing to determine the typology of the islands studied in this research case study. Based on the parameters that have been set and the results of field measurements, the islands of Mare and Tidore in the North Maluku Islands and Karimunjawa and Kemujan islands in the Karimunjawa Islands are categorized as small volcanic islands. Meanwhile, Cemara Besar Island in the Karimunjawa Islands is a small atoll island. Threats to small volcanic islands can be in the form of geological disasters such as earthquakes, volcanic eruptions, and tsunamis. On small atoll islands, the threat that lurks is related to the lack of freshwater and the physical-morphological dynamics of the island, which is strongly controlled by hydro-oceanographic characteristics.Keywords: geospatial, small volcanic island, small atoll island, morphology, disaster. AbstrakPulau-pulau kecil di Indonesia memiliki peranan vital dalam pengembangan sosial, ekonomi, budaya, lingkungan, dan kedaulatan bangsa. Di sisi lain, pulau kecil juga sangat rentan terhadap bencana maupun perubahan alam dan/atau aktivitas manusia. Ancaman dan bencana yang ada di pulau kecil dapat berbeda-beda mengikuti karakteristik dan tipologi pulau tersebut. Penelitian ini bertujuan untuk melakukan identifikasi tipologi pulau kecil dengan memanfaatkan data geospasial dalam analisis parameter geomorfologi yang meliputi morfologi, material, proses, serta parameter oseanografi seperti keberadaan ekosistem terumbu karang. Metode dalam penelitian ini dibagi menjadi tiga tahapan, yaitu pra lapangan, pengukuran lapangan, dan pasca lapangan. Kegiatan pra lapangan meliputi perumusan karaketristik masing-masing tipologi pulau melalui studi literatur serta pengolahan data geospasial, seperti DEM dan citra satelit SPOT 7, untuk penyusunan peta tematik. Tahap lapangan meliputi survei terestris berupa pengambilan foto udara, profiling, validasi hasil interpretasi, dan penyelaman. Tahap pasca-lapangan dilakukan untuk mengolah dan menganalisis hasil survei terestris yang dilakukan pada tahap lapangan. Analisis dilakukan secara deskriptif berdasarkan hasil pengolahan data untuk menentukan tipologi pulau-pulau yang dikaji dalam studi kasus penelitian ini. Berdasarkan pada parameter yang telah ditetapkan dan hasil pengukuran lapangan, maka Pulau Mare dan Tidore di Kepulauan Maluku Utara serta Pulau Karimunjawa dan Kemujan di Kepulauan Karimunjawa dikategorikan sebagai pulau kecil vulkan. Sedangkan Pulau Cemara Besar di Kepulauan Karimunjawa merupakan pulau kecil atol. Ancaman bagi pulau kecil vulkan dapat berupa bencana geologi seperi gempabumi, erupsi gunungapi, dan tsunami. Pada pulau kecil atol, ancaman yang mengintai berkaitan dengan minimnya sumberdaya air tawar dan dinamika fisik-morfologi pulau yang sangat dikontrol oleh karakteristik hidro-oseanografi.Kata kunci: geospasial, pulau kecil vulkan, pulau kecil atol, morfologi, kebencanaan.
KELIMPAHAN MEGABENTOS SEBAGAI INDIKATOR KESEHATAN KARANG DI PERAIRAN BILIK, TAMAN NASIONAL BALURAN, INDONESIA Bachtiar Wahyu Mutaqin; Emy Puspita Yuendini; Bagas Aditya; Isfi Nurafifa Rachmi; Muhammad Ilham Fathurrizqi; Shinta Ira Damayanti; Sufia Nur Ahadiah; Novanda Nurul Aini Puspitasari
JURNAL ENGGANO Vol 5, No 2
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/jenggano.5.2.181-194

Abstract

Ekosistem terumbu karang adalah ekosistem laut yang sangat rentan oleh kerusakan lingkungan. Terumbu karang di perairan Bilik, Taman Nasional Baluran merupakan contoh ekosistem terumbu karang yang mengalami ancaman kerusakan lingkungan akibat perubahan iklim dan aktivitas manusia. Salah satu metode yang dapat digunakan untuk memonitor kesehatan terumbu karang adalah dengan melihat kelimpahan megabentos dalam ekosistem terumbu karang. Oleh karena itu, penelitian ini memiliki tujuan untuk mengetahui kesehatan ekosistem terumbu karang dengan melihat kelimpahan megabentos di perairan Bilik, Taman Nasional Baluran. Metode yang digunakan dalam inventarisasi megabentos adalah dengan Benthos Belt Transect dan analisis video di Blok Sijile dan Blok Jeding di Perairan Bilik. Hasil pengamatan menunjukkan bahwa di Blok Sijile tidak ditemukan ekosistem terumbu karang dan megabentos. Sementara itu di Blok Jeding ditemukan ekosistem terumbu karang dengan megabentos berupa bulu babi dan bintang laut biru. Kelimpahan bulu babi di dan bintang laut biru adalah 0-0,14 individu/m2. Kondisi tersebut menunjukkan bahwa kesehatan ekosistem terumbu karang di Blok Jeding perairan Bilik Sijile masih baik, namun perlu mendapat perhatian khusus karena sebagian area terumbu karang mengalami pemutihan akibat aktivitas perikanan yang tidak ramah lingkungan.MEGABENTHOS ABUNDANCE AS CORAL HEALTH INDICATORS IN BILIK WATERS, BALURAN NATIONAL PARK, INDONESIA. Coral reef ecosystems are marine ecosystems that are prone to environmental damage. Coral reefs in Bilik waters, Baluran National Park, are examples of coral reef ecosystems that are threatened by environmental damage due to climate change and human activities. One of the methods for health monitoring of coral reefs is by looking at the abundance of megabenthos in coral reef ecosystems. Therefore, this study aims to determine the health of coral reef ecosystems by looking at the abundance of megabenthos in Bilik waters, Baluran National Park. We used Benthos Belt Transect and video analysis to identify the spatial distribution and number of megabenthos in Sijile Block and Jeding Block, Bilik waters. The results showed that in Sijile Block, there were no coral reef neither megabenthos ecosystems. Meanwhile, in Jeding Block, there was a coral reefs ecosystem with megabenthos in the form of sea urchins and blue starfish. The abundance of sea urchins and the blue sea star in Jeding Block was about 0-0.14 individual/m2. These conditions indicate that the health of the coral reef ecosystem in Jeding Block, Bilik waters was still in good condition, even though it still needs special attention related to coral bleaching as a consequence of fisheries activities that are not environmentally friendly.
Co-Authors Agung Harijoko Bagas Aditya Diki A. Amanatulloh Emy Puspita Yuendini Haryo Edi Wibowo Herlan Darmawan Isfi Nurafifa Rachmi M. Rokhis Khomarudin Mamay Surmayadi Muh Aris Marfai Muhammad Ilham Fathurrizqi Muhammad Nadafa Isnain Mulyadi Alwi Nia Haerani Novanda Nurul Aini Puspitasari Raditya Jati Shinta Ira Damayanti Sufia Nur Ahadiah Suratman Suratman Syarifudin Syarifudin Taufik Budi Waskita Wahyudi Wahyudi Wikanti Asriningrum