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Identification of Peatland Burned Area based on Multiple Spectral Indices and Adaptive Thresholding in Central Kalimantan Pratikasiwi, Hilda Ayu; Taufik, Muh.; Santikayasa, I Putu; Domiri, Dede Dirgahayu
Agromet Vol. 38 No. 2 (2024): DECEMBER 2024
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/j.agromet.38.2.68-77

Abstract

Nowadays, spectral index has become popular as a tool to identify fire-burned areas. However, the use of a single index may not be universally applicable to region with diverse landscape and vegetation as peatlands. Here, we propose to develop a procedure that integrates multiple spectral indices with an adaptive thresholding method to enhance the performance of burned area detection. We combined the Normalized Difference Vegetation Index (NDVI) and the Normalized Burn Ratio (NBR) using MODIS imagery from 2002 to 2022 to calculate (Confirmed Burned Pixel) by filtering dNDVI and dNBR. The mean and standard deviation of serve as inputs for image thresholding. We tested our approach in Sebangau peatland, Central Kalimantan, where fires occur annually. The results showed that the model performed well with overall accuracy > of 91%, indicating that the model is effective and reliable for identifying burned areas. The findings also revealed that the frequency of fire is below 2 times/year, with the southeastern is the most fire prone regions. Further, our findings provide an alternative approach for identifying burned areas in locations with diverse vegetation cover and different geographical regions.
RESPON MODEL HBV DAN MODEL TANGKI TERHADAP ESTIMASI DEBIT ALIRAN DI DAS BOGOWONTO, JAWA TENGAH Andini, Fitri Yusti; Dasanto, Bambang Dwi; Santikayasa, I Putu
JURNAL SUMBER DAYA AIR Vol 19, No 2 (2023)
Publisher : Direktorat Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jsda.v19i2.830

Abstract

 The scarcity of discharge data compared to rainfall data have driven the development of the rainfall-runoff model, such as the HBV and Tank models. This research aims to apply the rainfall-runoff model in the Bogowonto watershed and to assess the model outputs. The research consisted of two main stages: 1) model calibration and validation; 2) model evaluation which assesses the model performance based on the Nash-Sutcliffe Efficiency (NSE) index and the coefficient of determination (R2). The results showed that the pattern of the simulation discharge was in accordance with the observed discharge pattern; indicating performance of both models was good (NSE > 0.7 and R2 > 0.65). However, the performance of both models in the daily simulation, particularly at the beginning of the simulation period, is still not satisfactory as the simulated discharge does not match the observed discharge. In the next simulation period, the discharge of the model results were in accordance with the observed discharge; this means the performance of the model was better. In the monthly simulation, the performance of both models is not yet satisfactory during the wet season, but it is good during the dry season. Based on the results of the daily and monthly simulations, both models demonstrate good performance under low precipitation conditions, but their performance declines under high precipitation conditionsKeywords:       Bogowonto watershed, HBV, rainfall-runoff model, simulation, tank 
Analisis Multitemporal Pengaruh Perubahan Penggunaan Lahan terhadap Klasifikasi Resapan Air Tanah di Kota Surakarta Sulistiani, Sulistiani; Santikayasa, I Putu; Taufik, Muh; Lubis, Rachmat Fajar
Majalah Geografi Indonesia Vol 38, No 1 (2024): Majalah Geografi Indonesia
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/mgi.89966

Abstract

Abstrak. Meningkatnya mobilitas penduduk menyebabkan peningkatan kebutuhan air serta perubahan penggunaan lahan di perkotaan. Adanya peningkatan kebutuhan air, maka sangat diperlukan sumber-sumber air baru khususnya dari air tanah. Disisi lain, perubahan lahan sangat mempengaruhi kemampuan pengisian air tanah. Penelitian ini bertujuan untuk menganalisis secara multitemporal dari perubahan penggunaan lahan tahun 2010-2040 dan mengidentifikasi kondisi resapan air tanah di Kota Surakarta. Adapun metode yang digunakan untuk prediksi Land Use Land Cover (LULC) yaitu menggunakan pendekatan metode Cellular Automata – Artificial Neural Network (CA-ANN) dimana untuk mengevaluasi hasil prediksi LULC menggunakan metode akurasi kappa, sedangkan untuk analisis kondisi resapan air tanah menggunakan metode skoring. Bahan yang digunakan yaitu LULC dari citra Landsat 7 ETM+ dan Landsat OLI tahun 2000, 2010, dan 2020, DEM, jenis tanah, kemiringan lereng, dan curah hujan. Hasil prediksi LULC di Kota Surakarta menunjukkan bahwa terjadi peningkatan  LULC untuk kawasan terbangun dengan total luasan sebesar 71,08% pada tahun 2030 dan 71,83% pada tahun 2040. Selain kawasan terbangun, area vegetasi mengalami penurunan sebesar 1,26% di tahun 2040. Hasil simulasi kondisi resapan air tanah di Kota Surakarta tahun 2020 dan 2040 menunjukkan bahwa lokasi penelitian memiliki 5 kelas klasifikasi yaitu kondisi resapan baik, normal alami, mulai kritis, agak kritis, dan kritis. Kota Surakarta didominasi oleh kelas agak kritis dan kritis dengan luasan area sebesar 17,29 km2 tahun 2020 menjadi 20,85 km2 tahun 2040 untuk kelas IV yaitu agak kritis, dan untuk kelas V yaitu kritis memiliki luasan area sebesar 13,91 km2 tahun 2020 menjadi 15,08 km2 tahun 2040. Abstract. Increased population mobility leads to increased water demand and changes in land use in urban areas. With the increase in water demand, new water sources, especially from groundwater, are needed. On the other hand, land use change greatly affects groundwater recharge capacity. This research aims to analyse multitemporal land use change from 2010-2040 and identify the condition of groundwater recharge in Surakarta City. The method used for Land Use Land Cover (LULC) prediction is using Cellular Automata - Artificial Neural Network (CA-ANN) method approach where to evaluate the LULC prediction results using the kappa accuracy method, while for the analysis of groundwater recharge condition using scoring method. The materials used are LULC from Landsat 7 ETM+ and Landsat OLI images in 2000, 2010, and 2020, DEM, soil type, slope, and rainfall. The prediction results of LULC in Surakarta City show that there is an increase in LULC for built-up areas with a total area of 71.08% in 2030 and 71.83% in 2040. In addition to the built-up area, the vegetation area decreased by 1.26% in 2040. Meanwhile, the simulation results of groundwater infiltration conditions in Surakarta City in 2020 and 2040 show that the research location has 5 classification classes, namely good infiltration conditions, natural normal, starting to be critical, somewhat critical, and critical. Surakarta City is dominated by the mildly critical and critical classes with an area of 17.29 km2 in 2020 to 20.85 km2 in 2040 for class IV which is mildly critical, and for class V which is critical has an area of 13.91 km2 in 2020 to 15.08 km2 in 2040.