Tejakusuma, Iwan Gunawan
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SOIL CREEP IN BALEKAMBANG, CIRAWAMEKAR, CIPATAT DISTRICT, BANDUNG BARAT REGENCY, WEST JAVA Tejakusuma, Iwan Gunawan
Jurnal Sains dan Teknologi Mitigasi Bencana Vol 13, No 2 (2018): Jurnal Sains dan Teknologi Mitigasi Bencana
Publisher : Badan Pengkajian dan Penerapan Teknologi (BPPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (490.345 KB) | DOI: 10.29122/jstmb.v13i2.3369

Abstract

Soil creep occurred in Balekambang, Cirawamekar, Cipatat, West Bandung Regency, West Java. This area is karst hill consist of limestone with interbedded sediment in the valley. The limestone is interfingered with clay, marl and quartz sandstones. The clay and marl acting as the slipping plane with a steep dip of around 50o to 69o to the northwest. The direction of the slope movement approximately follows the direction of the bedding plane therefore the bedding plane control the soil creep. This landslide was triggered by rainfall which saturated the soil layer and environmental changes in the surrounding area.
THE ROLE OF ROOT PLANT ARCHITECTURE IN LANDSLIDE AND EROSION DISASTER MITIGATION Sittadewi, Euthalia Hanggari; Tejakusuma, Iwan Gunawan
Jurnal Sains dan Teknologi Mitigasi Bencana Vol 14, No 1 (2019): Jurnal Sains dan Teknologi Mitigasi Bencana
Publisher : Badan Pengkajian dan Penerapan Teknologi (BPPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (376.289 KB) | DOI: 10.29122/jstmb.v14i1.3552

Abstract

Landslide and erosion disasters are become increasingly common in the last decade which resulted in financial losses and even human casualties. Therefore, disaster mitigation efforts of landslide and erosion are very important to be done immediately. A breakthrough of comprehensive and practical solution is highly expected for mitigation. Vegetation can improve slope stability, provide positive aspects for the environment, and provide mechanical and hydrological effects on slopes that are prone to landslide and erosion. The use of vegetation to mitigate landslide and erosion disasters is very potential to be developed because besides being effective, it is also economical and environmentally friendly. The mechanical aspects of plant roots is able to strengthen the soil. Plant root characteristics such as root architecture, root anchor index (IJA), root grip index (ICA) are important variables to determine the types of plants that will be used in mitigating landslide and erosion. 
FAKTOR GEOLOGI DAN LINGKUNGAN DALAM KEJADIAN LONGSOR DI KABUPATEN MAJALENGKA JAWA BARAT Tejakusuma, Iwan Gunawan
Jurnal Sains dan Teknologi Mitigasi Bencana Vol 12, No 2 (2017): Jurnal Sains dan Teknologi Mitigasi Bencana
Publisher : Badan Pengkajian dan Penerapan Teknologi (BPPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (638.175 KB) | DOI: 10.29122/jstmb.v12i2.1750

Abstract

Kabupaten Majalengka didominasi oleh topografi perbukitan dan pegunungan yang mencakup 71,3% dari total luas kabupaten ini. Topografi tersebut tersebar di bagian tengah dan selatan kabupaten ini. Curah hujan bulanan mencapai 552 mm di bulan Desember 2013 dan pada bulan November, Januari, Februari, Maret dan April 2013 curah hujan tidak kurang dari 300 mm per bulan. Jumlah penduduk serta aktivitas manusi terus meningkat dari tahun ke tahun. Kejadian longsor di kabupaten ini tahun 2010 ? 2012 serta berdasarkan pengamatan lapangan kondisi longsor di Blok Gunung Payung, Blok Cigintung dan di Gunung Anten menunjukkan dominansi faktor kondisi geologi litologi sementara aktivitas manusia berupa pembuatan jalan, perumahan dan pembukaan lahan pertanian berkontribusi untuk terjadinya longsor. Curah hujan juga merupakan faktor pemicu longsor. Kombinasi kondisi geologi dan lingkungan seperti tersebut membuat daerah Kabupaten Majalengka rawan terhadap bencana longsor.
SOIL CREEP IN BALEKAMBANG, CIRAWAMEKAR, CIPATAT DISTRICT, BANDUNG BARAT REGENCY, WEST JAVA Tejakusuma, Iwan Gunawan
Jurnal Sains dan Teknologi Mitigasi Bencana Vol 13, No 2 (2018): Jurnal Sains dan Teknologi Mitigasi Bencana
Publisher : Badan Pengkajian dan Penerapan Teknologi (BPPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (490.345 KB) | DOI: 10.29122/jstmb.v13i2.3369

Abstract

Soil creep occurred in Balekambang, Cirawamekar, Cipatat, West Bandung Regency, West Java. This area is karst hill consist of limestone with interbedded sediment in the valley. The limestone is interfingered with clay, marl and quartz sandstones. The clay and marl acting as the slipping plane with a steep dip of around 50o to 69o to the northwest. The direction of the slope movement approximately follows the direction of the bedding plane therefore the bedding plane control the soil creep. This landslide was triggered by rainfall which saturated the soil layer and environmental changes in the surrounding area.
THE ROLE OF ROOT PLANT ARCHITECTURE IN LANDSLIDE AND EROSION DISASTER MITIGATION Sittadewi, Euthalia Hanggari; Tejakusuma, Iwan Gunawan
Jurnal Sains dan Teknologi Mitigasi Bencana Vol 14, No 1 (2019): Jurnal Sains dan Teknologi Mitigasi Bencana
Publisher : Badan Pengkajian dan Penerapan Teknologi (BPPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (376.289 KB) | DOI: 10.29122/jstmb.v14i1.3552

Abstract

Landslide and erosion disasters are become increasingly common in the last decade which resulted in financial losses and even human casualties. Therefore, disaster mitigation efforts of landslide and erosion are very important to be done immediately. A breakthrough of comprehensive and practical solution is highly expected for mitigation. Vegetation can improve slope stability, provide positive aspects for the environment, and provide mechanical and hydrological effects on slopes that are prone to landslide and erosion. The use of vegetation to mitigate landslide and erosion disasters is very potential to be developed because besides being effective, it is also economical and environmentally friendly. The mechanical aspects of plant roots is able to strengthen the soil. Plant root characteristics such as root architecture, root anchor index (IJA), root grip index (ICA) are important variables to determine the types of plants that will be used in mitigating landslide and erosion. 
DETERMINATION OF LANDSLIDE SLIP PLANE USING GEOLOGY AND GEOELECTRICAL ANALYSIS AT MOUNT GEGER PULUS LEGOK EMO SLOPE SEGMENT, CILILIN, WEST JAVA Tejakusuma, Iwan Gunawan
Jurnal Sains dan Teknologi Mitigasi Bencana Vol 15, No 1 (2020): JURNAL SAINS DAN TEKNOLOGI MITIGASI BENCANA
Publisher : Badan Pengkajian dan Penerapan Teknologi (BPPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1737.337 KB) | DOI: 10.29122/jstmb.v15i1.4114

Abstract

Mount Geger Pulus in Cililin District, West Java shows a cone geomorphology composed of an Andesitic intrusion in which part of the slope is covered by volcanic rock. Small scale landslides have occurred several times indicating that the surrounding area is at risk of landslides. The slope segment of Legok Emo of this mount has a steep to very steep slope, covered by secondary and mixed forests. Settlement lies around the bottom of this slope. The results of geoelectrical measurements and geological analysis of this slope segment indicate that the slope has a potential to landslide that is controlled by tuff acting as a slip plane and can be triggered by rainfall. The layer that has the potential to landsliding are weathered volcanic breccias with a thickness of about 3 meters with a maximum of 5 meters that is overlying tuff which is relatively impermeable.
UTILIZATION OF ARTIFICIAL INTELLIGENCE TO IMPROVE FLOOD DISASTER MITIGATION Riza, Hammam; Santoso, Eko Widi; Tejakusuma, Iwan Gunawan; Prawiradisastra, Firman; Prihartanto, Prihartanto
Jurnal Sains dan Teknologi Mitigasi Bencana Vol 15, No 1 (2020): JURNAL SAINS DAN TEKNOLOGI MITIGASI BENCANA
Publisher : Badan Pengkajian dan Penerapan Teknologi (BPPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1516.032 KB) | DOI: 10.29122/jstmb.v15i1.4145

Abstract

Flood disaster is one of predominant disaster event in Indonesia. The frequency and intensity of this disaster tend to increase from year to year as well as the losses caused thereby. To reduce the risks and losses due to flood disasters, innovation in disaster mitigation is needed. Artificial intelligence and machine learning are technological innovations that have been widely applied in various fields of life and can also be used to improve flood disaster mitigation. A literature study conducted in this research shows that the use of artificial intelligence and machine learning has proven to be able, and succeed to fastly and accurately perform flood prediction, flood risk mapping, flood emergency response and, flood damage mapping. ANNs, SVM, SVR, ANFIS, WNN and DTs are popular methods used for flood mitigation in the pre-disaster phase and it is recommended to use a combination or hybrid of these methods. During the flood disaster response phase, the application of artificial intelligence and machine learning are still not much has been done and need to be developed. Examples of the application are the use of big data from social media Twitter and machine learning both supervised learning with Random Forest and unsupervised learning with CNN which have shown good results and have a good prospect to be applied. For the use of artificial intelligence in post-disaster flood phase, are still also rare, because it requires actual data from the field. However, in the future, it will become a promising program for the assessment and application of artificial intelligence in the flood disaster mitigation.
Identifikasi Potensi Air Tanah untuk Kebutuhan Penyediaan Air Bersih dengan Metode Geolistrik: Studi Kasus di Kawasan Geostech, Puspiptek Serpong Naryanto, Heru Sri; Khaerani, Puspa; Trisnafiah, Syakira; Shomim, Achmad Fakhrus; Wisyanto, Wisyanto; Tejakusuma, Iwan Gunawan
Jurnal Teknologi Lingkungan Vol. 21 No. 2 (2020)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jtl.v21i2.3577

Abstract

ABSTRACTGeostech Building, as an office and laboratory facility, requires a source of clean water from groundwater related to the limited supply of clean water from the PDAM. Due to the needs of freshwater from groundwater origin, data and information are needed regarding the potential groundwater in the area, including aquifer configuration, depth, and groundwater potential. The presence of groundwater is not distributed through every area, and it's related to the geological and geohydrological conditions. One of the geophysical methods that can describe subsurface is 2D geoelectric methods. This method can distinguish and analyze rock types, geological structures, groundwater aquifers, and other important information based on the characteristics of the electricity of rocks by looking at the value of the type of resistance. In this measurement, the Wenner Alpha configuration has been used, where the arrangement of A-B current electrodes and M-N potential electrodes have constant spacing. From the measurement results, it can be interpreted that there is a low resistivity layer containing porous groundwater as an aquifer. Based on regional geological data, it has been estimated that this layer is in the form of sandy tuff (0-1.5 ohm-m). The exploitation of groundwater with drilling is expected to reach the aquifer's upper layer at depth, starting from 11.5-13 meters. The groundwater aquifer thickness cannot be ascertained because of the penetration of the lower depth of 2D geoelectric measurements truncated by the constraint of a maximum stretch of cable. The upper layer of the aquifer contains a turned layer of fine tufa and medium tuff, which is impermeable, coarse tuff, and mixed soil with varying thickness at the upper layer.Keywords: 2D geoelectric, aquifer, potential groundwater, Geostech  ABSTRAKGedung Geostech sebagai sarana perkantoran dan laboratorium memerlukan sumber air bersih dari air tanah terkait dengan terbatasnya suplai air bersih dari PDAM. Kebutuhan air bersih berasal dari air tanah, maka diperlukan data dan informasi mengenai kondisi potensi air tanah di kawasan tersebut termasuk konfigurasi akuifer, kedalaman, dan potensi air tanahnya. Keberadaan air tanah tidaklah merata untuk setiap tempat dan sangat terkait dengan kondisi geologi dan geohidrologinya. Salah satu metode geofisika yang dapat memberikan gambaran kondisi bawah permukaan adalah dengan metode geolistrik 2D. Metode ini dapat membedakan dan menganalisis jenis batuan, struktur geologi, akuifer air tanah, dan informasi penting lainnya berdasarkan sifat kelistrikan batuan dengan melihat nilai tahanan jenisnya. Dalam pengukuran ini digunakan konfigurasi Wenner Alpha, dimana susunan elektroda arus A dan B dan elektroda potensial M dan N mempunyai spasi yang konstan. Dari hasil pengukuran dapat diinterpretasikan adanya lapisan dengan resistivitas rendah yang mengandung air tanah dan bersifat porous sebagai akuifer. Berdasarkan data geologi regional diperkirakan lapisan ini berupa tuf pasiran (0-1,5 ohm-m). Pengambilan air tanah dengan pemboran diperkirakan akan mengenai batas atas lapisan akuifer pada kedalaman 11,5-13 meter. Ketebalan akuifer air tanah tidak bisa dihitung karena penetrasi kedalaman pengukuran geolistrik 2D terbatasi oleh bentangan elektroda di permukaan. Lapisan di atas akuifer merupakan lapisan selang-seling tuf halus dan tuf sedang yang kedap air, tuf kasar, dan pada bagian paling atas merupakan tanah urugan dengan ketebalan bervariasi.Kata kunci: Geolistrik 2D, akuifer, potensi air tanah, Geostech