Hasil Pencarian  ::  Simpan CSV :: Kembali

"Rapid socio-economic development along with exceptional rainfall can potentially exacerbate risk of flood damage to life and property in the lower Nam Phong River Basin. In relation to this, the non-structural measures including risk-based zoning could be considered as an effective solution in mitigating the flood threat in the future. Thus, a coupling of the hydrological model HEC–HMS and hydrodynamic model HEC–RAS, which increases the robustness and predictability to the overall findings, was applied to assess flood hazard in this study. The outcomes highlighted that the applications of the HEC–HMS and HEC–RAS models are suitable for the study area with the Nash-Sutcliffe Efficiency (ENS) varied between 0.75 to 0.87 and the coefficient of determination (R2) ranged between 0.81 to 0.92. Moreover, the flood zone mapping was also carried out based on the Flood Hazard Rating (FHR) analysis. As a result, the flood hazard areas were determined which covers about 16.5% of the total river basin areas, and it was classified into four zones, i.e. extreme (18.79% of inundated area), high (46.33% of inundated area), moderate (18.24% of inundated area), and low (16.64% of inundated area), respectively. The obtained findings can be useful as the adaptation guideline for water resources planning and flood management in the lower Nam Phong River Basin and other parts of Thailand."

"Kota Singkawang merupakan salah satu kota di Provinsi Kalimantan Barat yang berada pada dataran aluvial, sehingga mengakibatkan kota tersebut menjadi rawan akan bahaya banjir. Banjir terjadi setiap tahunnya dan mengakibatkan kerugian baik secara sosial dan ekonomi. Banjir di pusat Kota Singkawang terakhir kali terjadi pada tahun 2016 yang mengakibatkan banyaknya bangunan yang tergenang dan ratusan warga harus dievakuasi. Berdasarkan latar belakang tersebut, penelitian ini ditujukan untuk mengidentifikasi tingkat bahaya banjir, kemudian dilanjutkan dengan melakukan penilaian kerugian ekonomi. Tingkat bahaya banjir diperoleh dengan melakukan overlay pada parameter karakteristik banjir, yaitu frekuensi, durasi, dan tinggi banjir. Metode dalam penilaian kerugian dilakukan dengan metode stratified random sampling dengan total sampel sebanyak 99 sampel, dimana diambil 3 sampel untuk tiap nilai bangunan pada tiap kelas bahaya banjir terdapat 11 nilai bangunan di pusat Kota Singkawang. Hasil penelitian menunjukkan bahwa daerah penelitian di dominasi oleh banjir dengan bahaya rendah dan sedang dengan persentase luasan 44,02 dan 43,03, serta bahaya tinggi sebesar 12.95 yang didominasi pada wilayah barat daerah penelitian. Berdasarkan hasil penilaian kerugian, diperoleh total kerugian akibat banjir sebesar Rp15.838.232.500 1,150 million USD. Terdapat perbedaan sebaran kerugian pada wilayah barat dan timur daerah penelitian, dimana kerugian pada wilayah barat lebih tinggi karena didominasi oleh bangunan-bangunan dengan kategori usaha. Hasil penelitian tidak hanya sebatas jumlah kerugian, namun juga melihat distribusi spasial dari kerugian tersebut. Penelitian ini dilakukan sebagai upaya pengembangan mitigasi bencana pada wilayah dengan tingkat bahaya banjir serta kerugian ekonomi yang tinggi, serta dapat digunakan sebagai acuan dalam proses perencanaan pembangunan agar lebih memperhatikan aspek kebencanaan. ......Singkawang City is in the Province of West Kalimantan, which is located above an alluvial plain, that causing the city to be prone of flood. Floods that occur annually have result in social and economic losses. The last flood that occurred in the centre of Singkawang City happened in 2016, which resulted in many flooded buildings and hundreds evacuated resident. Based on that background, this research is to identify the hazard level of flooding and then proceed with the assessment of economic losses based on the floods that occurred. The flood hazard level is obtained by overlaying the flood characteristics parameters, i.e. frequency, duration, and height of the flood. The method for assessing the rate of the damage is done by stratified random sampling method with total sample of 99 samples, in which 3 samples were taken for each building value in each level of flood hazard there are 11 building values in the centre of Singkawang City. The result showed that the region was dominated by floods with high and medium classification, with percentage of area 44,02 and 43,03, and high classification with percentage of 12,95, which is dominated in western part of the region. The loss assessment for this research shows that the total loss from the flood is Rp15.838.232.500 1.150 million USD. There is a difference in the distribution of losses in the western and eastern part of the research area, where the losses in the western part of the region are higher, which is because it is dominated in the business district. The result of this study not only limited to the amount of losses, but also to identify the spatial distribution of these losses. This research is conducted as an effort to develop disaster mitigation in areas with high flood hazard and economic losses, also can be used as a reference in the regional development to pay more attention to the disaster aspect."

"ABSTRAKPermasalahan bencana banjir tidak hanya dipengaruhui oleh fenomena alam yang ekstrim saja, tetapi juga dipengaruhi oleh kondisi kerusakan lingkungan, fenomena sosial mayarakat serta kebijakan pemerintah dalam upaya mengurangi risiko banjir. Strategi upaya mengurangi risiko banjir dapat dilakukan secara tepat dengan melakukan penilaian risiko banjir meliputi penilaian bahaya, kerentanan dan kapasitas. Penelitian ini bertujuan untuk mengembangkan model penilaian bahaya banjir berdasarkan data kejadian bencana banjir di DAS Kemuning Sampang Madura. Metode penilaian bahaya banjir terdiri dari 2 (dua) antara lain metode indeks topographi modifikasi dan metode kombinasi Geomorphic Flood Index(GFI) dan metode Height Above the Nearest Drainage (HAND). Indeks bahaya banjir dibagi menjadi 3 kelas yaitu rendah (indeks bahaya < 0,333), sedang (indeks bahaya: 0.333 - 0.666), tinggi (indeks bahaya > 0,666). Hasil Indeks Bahaya Banjir model indeks topographi modifikasi diperoleh luas bahaya banjir sebesar 6459 hektar (24%) indeks bahaya tinggi, 8329 hektar (31%) indeks bahaya sedang, dan 11882 hektar (45%) indeks bahaya rendah. Sedangkan hasil Indeks Bahaya Banjir model kombinasi GFI dan HAND luas bahayanya sebesar 1402 hektar (44%) indeks bahaya tinggi, 1271 hektar (40%) indeks bahaya sedang, 504 hektar (16%) indeks bahaya rendah. Model penilaian bahaya banjir metode kombinasi GFI dan HAND disimpulkan memiliki hasil yang sebagian besar mewakili kejadian sebenarnya di Kabupaten Sampang serta mampu mengakomodir model penilaian bahaya banjir sesuai ketentuan pada Perka BNPB No. 2 Tahun 2012 yaitu menggunakan parameter potensi ketinggian genangan, sehingga direkomendasikan sebagai model penilaian bahaya banjir tingkat Kab/Kota berdasarkan data kejadian (histori) banjir.

---

ABSTRACTThe problem of floods event is not only affected by extreme natural phenomena, but also influenced by conditions of environmental damage, social phenomena and government policies in efforts to reduce floods risk.The strategy to reduce flood risk can be done appropriately with conducting flood risk assessments including hazard assessment, vulnerability and capacity. This study aims to develop a flood hazard assessment model based on historical data on flood event in Kemuning watershed, Sampang-Madura. The flood hazard assessment method consists of 2, including the modified topographic index (MTI) method and the combination of the geomorphic flood index (GFI) method and the height above the nearest drainage (HAND) method. The disaster hazard level is divided into 3 classes, namely low (hazard index <0.333), medium (hazard index: 0.333 - 0.666), high (hazard index> 0.666). The result is a flood hazard index using modified topographic index models that with details of 1182 hectare (24%) high level, 8329 hectare (31 %) medium level, 11882 hectare (45%) low level. While the result is a flood hazard index using GFI and HAND Combination models that with details of 1402 hectare (44%) high level, 1271 hectare (40 %) medium level, 504 hectare (16 %) low level.The flood hazard assessment model of the GFI and HAND combination method is concluded to have results that largely represent the actual events in Sampang Regency and are able to accommodate the flood hazard assessment model according to the provisions of Perka BNPB No. 2 of 2012, namely using parameters of potential inundation height, so it is recommended as a flood hazard assessment model at the district /city level based on the event data (history) of floods."

"DA Citarum Hulu dikenal dengan karakteristiknya yang unik dimana topografinya menyerupai cekungan dan dikelilingi oleh pegunungan. Dengan topografi berupa cekungan, kawasan DA Citarum hulu rawan banjir dan banjir bandang. Seperti di salah satu sub-DASnya yaitu Ciwidey, banjir bandang hampir terjadi setiap tahun dalam 10 tahun terakhir dan menimbulkan banyak kerugian. Berkaitan dengan permasalahan banjir bandang yang ada, perlu diwaspadai kejadian serupa di kemudian hari dengan melakukan kajian berupa upaya mitigasi untuk meminimalkan risiko dan dampak kerugian jiwa dan material. Dalam penelitian ini peneliti menerapkan metode indeks kerawanan banjir bandang yang bertujuan untuk mengetahui karakteristik fisik, hidrologis, dan tata guna lahan serta kawasan rawan banjir bandang di sub DAS Ciwidey Jawa Barat dengan skoring dan pembobotan yang terintegrasi. dalam perangkat lunak berbasis sistem informasi geografis. Dari proses tersebut dihasilkan daerah rawan banjir bandang dengan tingkat kerawanan sangat tinggi sebesar 33,9%, tingkat kerawanan tinggi sebesar 3,49%, tingkat kerawanan sedang sebesar 38,63%, tingkat kerawanan rendah sebesar 15,77%, dan kerawanan sangat rendah. tingkat., 21%....... Upper Citarum DA is known for its unique characteristics where its topography resembles a basin and is surrounded by mountains. With a topography of a basin, the upstream Citarum DA area is prone to flooding and flash floods. As in one of its sub-watersheds, namely Ciwidey, flash floods have occurred almost every year for the last 10 years and have caused a lot of losses. In relation to the existing banjir bandang problems, it is necessary to watch out for similar incidents in the future by conducting studies in the form of mitigation efforts to minimize the risks and impacts of life and material losses. In this study, the researchers applied the banjir bandang susceptibility index method which aims to determine the physical, hydrological, and land use characteristics as well as flash flood-prone areas in the Ciwidey sub-watershed, West Java, with integrated scoring and weighting. in geographic information system-based software. This process resulted in flash flood-prone areas with a very high level of vulnerability of 33.9%, a high level of vulnerability of 3.49%, a moderate level of vulnerability of 38.63%, a low level of vulnerability of 15.77%, and a very low vulnerability. . level., 21%."