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DETECTING THE SURFACE WATER AREA IN CIRATA DAM UPSTREAM CITARUM USING A WATER INDEX FROM SENTINEL-2 Suwarsono, Suwarsono; Yulianto, Fajar; Fitriana, Hana Listi; Nugroho, Udhi Catur; Sukowati, Kusumaning Ayu Dyah; Khomarudin, Muhammad Rokhis
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 17, No 1 (2020)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.ijreses.2020.v17.a3286

Abstract

This paper describes the detection of the surface water area in Cirata dam,  upstream Citarum, using a water index derived from Sentinel-2. MSI Level 1C (MSIL1C) data from 16 November 2018 were extracted into a water index such as the NDWI (Normalized Difference Water Index) model of Gao (1996), McFeeters (1996), Roger and Kearney (2004), and Xu (2006). Water index were analyzed based on the presence of several objects (water, vegetation, soil, and built-up). The research resulted in the ability of each water index to separate water and non-water objects. The results conclude that the NDWI of McFeeters (1996) derived from Sentinel-2 MSI showed the best results in detecting the surface water area of the reservoir.
Pemanfaatan Data Satelit Sentinel-5P untuk Pemantauan SO2 Pasca Erupsi Gunung Anak Krakatau Putri, Fanny Aditya; Nugroho, Udhi Catur; Tjahjaningsih, Arum; Brahmantara, Randy Prima
Jurnal Lingkungan dan Bencana Geologi Vol 14, No 1 (2023)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v14i1.351

Abstract

Salah  satu  gunung  api  yang  cukup diwaspadai  di  Indonesia  saat  ini adalah  Gunung  Anak  Krakatau  yang terletak  di  Selat  Sunda.  Aktivitas letusan  gunung ini  telah  terjadi secara  sporadis  dalam  beberapa dekade  terakhir. Berdasarkan data PVMBG, pada bulan April 2020 Gunung Anak Krakatau mengalami erupsi. Gas SO2 yang diemisikan pada saat erupsi gunung api perlu dipantau persebarannya. Gas SO2 tersebut di udara dapat bereaksi dengan uap air membentuk senyawa sulfat yang dapat menyebabkan hujan asam. Selain dapat menyebabkan hujan asam dalam skala lokal, SO2 dari letusan gunungapi juga dapat mempengaruhi iklim secara global. Teknologi penginderaan jauh satelit telah banyak digunakan untuk memantau SO2 pasca erupsi gunung api. European Space Agency (ESA) meluncurkan satelit Sentinel-5 Precursor (Sentinel-5P) yang memiliki misi melakukan monitoring polusi udara dengan mengamati konsentrasi gas-gas yang ada di atmosfer. Salah satu sensor yang dibawa oleh satelit Sentinel-5P adalah The TROPOspheric Monitoring Instrument (TROPOMI). Pada penelitian ini, data Sentinel-5P digunakan untuk memantau konsentrasi gas SO2 pasca erupsi Gunung Anak Krakatau pada tanggal 10 April 2020. Berdasarkan hasil pengolahan data, diperoleh bahwa peningkatan konsentrasi SO2 teramati oleh Sentinel-5P pada tanggal 11 April dan mencapai konsentrasi puncak pada tanggal 12 April. Setelah tanggal 12 April, konsentrasi SO2 mulai menurun tetapi tetap menunjukkan nilai yang lebih tinggi dibandingkan dengan nilai di awal bulan April. Hal ini disebabkan oleh adanya beberapa erupsi yang terekam di seismograf, walaupun secara visual tidak teramati. Dengan demikian dapat disimpulkan bahwa satelit Sentinel-5P dapat digunakan untuk pemantauan peningkatan konsentrasi SO2 akibat erupsi gunung api.
Spatial and temporal distribution of estimated surface runoff caused by land use/land cover changes in the upstream Citarum watershed, West Java, Indonesia Yulianto, Fajar; Khomarudin, Muhammad Rokhis; Hermawan, Eddy; Nugroho, Nunung Puji; Chulafak, Galdita Aruba; Nugroho, Gatot; Nugroho, Udhi Catur; Suwarsono, Suwarsono; Fitriana, Hana Listi; Priyanto, Eko
Journal of Degraded and Mining Lands Management Vol. 9 No. 2 (2022)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2022.092.3293

Abstract

In Indonesia, flooding is one of the natural hazards that often occurs during the rainy season. Surface runoff coefficient values are an essential indicator of the supply of regional water resources. The smaller the surface runoff value, the greater the water storage in the ground, and the smaller surface was running water. This study analyses the spatial and temporal distribution of the estimated surface runoff caused by land use/land cover changes in the upstream Citarum watershed. The study area is located in the upstream Citarum watershed, West Java, Indonesia. The site has a long history of flooding and various complex environmental problems. The geographic Information System method was used as a tool in analyzing the spatially and temporally. The research result shows that there has been a change in land cover in several periods of the year in the Citarum upstream watershed. The occurrence of the LULC phenomenon positively affects the surface runoff coefficient. The increasing area of Built land and plantation in the Citarum upstream watershed will further increase the surface runoff coefficient and, in the end, will potentially increase the surface runoff and contribute to flooding in the Bandung basin. This study results can be used to provide input in determining the direction and policies for watershed management, taking into account the varying characteristics of each subwatershed.