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INDONESIA
Jurnal Sains & Teknologi Modifikasi Cuaca
Published by Badan Pengkajian dan Penerapan Teknologi
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Education
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Vol. 13 No. 1 (2012): June 2012" : 5 Documents clear
THE USE OF WRF MODEL TO SUPPORT CLOUD SEEDING OPERATION: A STUDY IN THE CITARUM CATCHMENT AREA Mahally Kudsy; Ridwan Ridwan; Findy Renggono; Faisal Sunarto
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 13 No. 1 (2012): June 2012
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v13i1.2203

Abstract

This paper presents about the use of WRF modelling to assist weather analysis for cloud seeding operation in the Citarum Catchment Area, West Java, Indonesia. In this study, WRF parameterization was carried out . The parameterized values were used to forecast precipitation during cloud seeding operation. To study the effect of variational run, WRF 3DVAR was run using GDAS data set and doppler weather radar data. The result of this study shows that precipitation can be better predicted by ingesting radar data into 3DVAR run.Makalah ini menyajikan tentang penggunaan pemodelan dengan WRF untuk membantu analisis cuaca yang dipakai dalam operasi penyemaian awan di DAS Citarum, Jawa Barat, Indonesia. Dalam kajian ini telah dilakukan parameterisasi WRF, kemudian nilaiparameter yang diperoleh dipakai untuk mendapatkan prakiraan presipitasi selama operasi penyemaian awan. Untuk mempelajari pengaruh dari run variasional, WRF 3DVAR dijalankan dengan menggunakan data GDAS dan data radar doppler. Hasil dari studi ini menunjukkan bahwa prakiraan presipitasi yang lebih baik dapat diperoleh dengan mengasimilasikan data radar ke dalam run 3DVAR.
ANALYSIS OF STORM CATEGORY AND COALESCENCE ACTIVITY : RELATIONSHIP TO THE DAILY MEAN CATCHMENT RAINFALL (CASES CLOUD SEEDING OPERATIONAL IN LARONA AND CITARUM CATCHMENT AREA) Untung Haryanto; Dini Harsanti; R. Djoko Goenawan; Krisna Adithya
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 13 No. 1 (2012): June 2012
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v13i1.2204

Abstract

Cloud seeding operational has been conducted in Indonesia. In this study, the two cases operational were analysis, ie Larona (2005) and Citarum Catchment Area (2011). The coalescence activity during operational were analysed using archives of NOAAGFS model sounding and it also used to determined storm category and ICA. For this purpose, the number parameters for moderate threshold range on Raob-55 software were reduced and modified with more suitable range for Indonesia region. Result indicated that in Larona Catchment Area, the most of the storm having category weak to moderate with mean of storm category 67% and 21% respectively, the mean ICA value was -5.7. Relative larger weight of Weak and Medium category of storm were shown in Citarum ie 72% for weak and 18%, with the mean of ICA was -2.7%. As consequences, proportion of Medium together with Strong category for Larona is larger than Citarum,resulting larger amount mean catchment rainfall for Larona (17.1mm) compare to the Citarum (5.2 mm). The coalescence actifity in cloud during operation was effective for booth of two area, but varies due to the varies of cloud base height temperature and potential buoyancy (PB). The mean of CCL temperature in Larona was 20.30C since PB was 3.80C. This study also found that mean 500mb temperature (T) and mean rising parcel (TP) in Larona catchments was more warmer comparing to the Citarum is -4.00C and -0.150C for Larona , and -5.30C and -1.50C for Citarum. Base of the result it has been concluded that ICA has inverse correlation to the mean daily catchments rainfall, since together of Medium and Strong Storm Category has positive correlation.Modifikasi awan sudah operasional. Pada studi ini dilakukan analisis dua kasus operasional , yaitu operasional di DAS (Daerah Aliran Sungai) Larona (2005) dan DAS Citarum (2011). Aktifitas koalesensi selama operasional dianalisis menggunakan arsip data sounding NOAA-GFS yang digunakan untuk menentukan ICA (Index Coalescence Activity – indeks aktifitas koealesensi) dan Storm Category – kategori awan hujan). Bagi keperluan ini banyaknya parameter dan rentang kategori moderat pada perangkat lunak Raob -55 di dikurangi dan dimodifikasi dengan yang paling sesuai dengan kondisi daerah di Indonesia. Hasil analisis menunjukkan sebagian besar awan hujan yang ada memiliki kategori weak hingga moderat – yaitu 67% dan 21% di DAS Larona dengan rata-rata nilai ICA besarnya -5.7, sedangkan di DAS Citarum, nilai kategori ini lebih besar yaitu 72% dan 18% dengan nilai rata rata ICA adalah -2.7. Sebagai konsekuensinya adalah porsi awan hujan dengan kategori ini lebih banyak muncul di DAS Larona dibandingkan pada DAS Citarum dengan rata rata hujan masing masing 17.1mm di DAS Larona dan 5.2mm di DAS Citarum. Aktivitas koalesensi di kedua DAS ini sama-sama aktif, variasinya ditentukan oleh variasi ketinggian dasar awan konvektif (CCL) dan potensi daya apung awan (PB). Di DAS Larona CCL cukup hangat yaitu 20.30C , dengan nilai PB 3.80C. Pada sutudi ini juga di peroleh bahwa rata rata suhu dan suhu parsel paras 500mb pada DAS Larona lebih hangat (-4.00C dan -0.150C) dari pada di DAS Citarum (-5.30C dan -1.50C). Dari studi ini, disimpulkan bahwa ICA berkorelasi terbalik dengan curah hujan harian, dan berkorelasi positif dengan awan hujan berkategori “ sedang” dan “kuat” secara bersama-sama.
ANALISIS ANGIN DANAU DI DAS LARONA, SULAWESI SELATAN Findy Renggono
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 13 No. 1 (2012): June 2012
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v13i1.2205

Abstract

Karakteristik cuaca di DAS Larona sangat penting untuk diketahui karena terkait dengan ketersediaan air danau sebagai sumber utama penggerak turbin pembangkit listrik di wilayah tersebut. Keberadaan tiga danau yang berada di dalam DAS sangat memengaruhi kondisi cuaca lokal. Data permukaan tahun 2009-2010 dari 9 lokasi di sekitar danau digunakan untuk melihat kemunculan angin danau. Hasil analisis menunjukkan adanya perubahan arah angin pada siang hari di lokasi- okasi yang terletak dekat dengan tepi danau. Kejadian hujan yang muncul pun berkorelasi dengan angin yang berhembus dari arah danau.Study of climate characteristic around Larona watershed is very important as it is associated with water availability on the lakes which is used to drive turbines of Hydro electric power. The three large lakes inside the watershed are a great contributor for affecting local climate. Surface data from nine locations near the lakes were  nalyzed to reveal the existence of lake-land wind. The result shows that the effects of lakeland breeze were found on the location near the lake beach. The lake-land breeze occurrence was also correlated with rain fall over the area.
STUDI PULAU PANAS PERKOTAAN DAN KAITANNYA DENGAN PERUBAHAN PARAMETER IKLIM SUHU DAN CURAH HUJAN MENGGUNAKAN CITRA SATELIT LANDSAT TM STUDI KASUS DKI JAKARTA DAN SEKITARNYA Halda Aditya Belgaman; Sri Lestari; Hilda Lestiana
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 13 No. 1 (2012): June 2012
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v13i1.2206

Abstract

Pulau panas adalah suatu fenomena dimana suhu udara di suatu daerah lebih tinggi daripada suhu udara terbuka di sekitarnya. Daerah urban (perkotaan) sering mempunyai suhu lebih tinggi 1-6 derajat Celsius dibandingkan daerah sekitarnya (daerah pinggiran/ rural). Fenomena inilah yang dikenal sebagai ”Pulau Panas perkotaan” atau ”Urban Heat Island” (UHI). Penelitian ini bertujuan untuk mengetahui pengaruh fenomena pulau panas perkotaan terhadap parameter iklim terutama suhu dan curah hujan di daerahJakarta dan sekitarnya. Data yang digunakan pada tugas akhir ini adalah data curah hujan dan temperatur udara harian pada 5 stasiun pengamatan iklim, periode Januari 1991 – Desember 2001 sebagai data permukaan. Citra satelit Landsat 7 ETM+ path / row 122/064 akuisisi tanggal 15/07/2001 band 5,4,2 digunakan untuk menganalisis tutupan lahan dan band 6 digunakan untuk distribusi temperatur permukaan. Hasil menunjukkan nilai temperatur permukaan Kota Jakarta dan sekitarnya berada antara 15.07˚C hingga 33.28˚C. Lokasi pulau panas perkotaan terdapat di daerah Jakarta pusat dan Jakarta utara, dengan perbedaan temperatur sebesar 3˚C dibandingkan dengan daerah sekitarnya.Tutupan lahan yang terdapat di lokasi tersebut merupakan lahan terbangun yang terdiri dari bangunan perumahan, perkantoran, dan jalan raya. Perhitungan nilai korelasi Spearman antara data temperatur udara dari lima stasiun pengamatan dengan nilai piksel temperatur permukaan memperlihatkan adanya korelasi positif antara dua variabel tersebut yang ditunjukkan oleh indeks korelasi sebesar 0.6.Dengan persamaan regresi diperoleh citra temperatur permukaan di seluruh daerah pengamatan yang hasilnya menggambarkan bahwa lokasi pulau panas perkotaan sangat berpengaruh terhadap distribusi temperatur udara di atasnya.Heat island was a phenomenon where the temperature of air in one region higher than the temperature of the open air around it. Urban areas often had the temperature higher 1-6 Celsius when compared the area of surrounding area (the area of outskirts/rural). This phenomenon that was known as ”Pulau Panas Perkotaan” or ”Urban Heat Island” (UHI). This Research aimed to knowing influence of the heat islands of urban areas to climate parameter especially the temperature and the rainfall in the Jakarta and surrounding area. Data used in this research was rainfall data and daily air temperaturefrom 5 climate observation stations, within time period from January 1991 to December 2001 as the surface data. The Landsat satellite image 7 ETM+ path/row 122/064 acquisition date 15/07/2001, band 5, 4, 2 was used to analyze the cover of land and the band 6 was used for the distribution of surface temperature was based on the pixels value.Results showed the value of surface temperature in Jakarta and surrounding area was between 15.07˚C through to 33.28˚C. Location of heat island were in the centre Jakarta and north Jakarta, with the difference of the temperature as big as 3˚C with thesurrounding area. The land cover in this location were the housing building, the office complex, and the highway. Calculation of Spearman correlation value between the air temperature and surface temperature showed the existence of the positive correlation between two variables that it was demonstrated by the correlation index 0.6. From the regression equation we get the interpolated air temperature in Jakarta area.
PENERAPAN TEKNOLOGI MODIFIKASI CUACA (TMC) UNTUK MENGATASI DEFISIT INFLOW PLTA BAKARU PERIODE 15 FEBRUARI SD. 03 MARET 2012 Muhamad Djazim Syaifullah
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 13 No. 1 (2012): June 2012
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v13i1.2207

Abstract

Teknologi Modifikasi Cuaca (TMC) telah dilakukan di DAS Mamasa Sulawesi Barat untuk mengatasi defisit inflow PLTA Bakaru. Selama pelaksanaan kegiatan ini, kondisi perawanan di DAS Mamasa menunjukan adanya fluktuasi peluang keberadaan awan-awan potensial. Potensi awan secara umum cukup baik sejak awal sampaiakhir kegiatan. Pada awal kegiatan, pertumbuhan awan relatif terjadi pada siang dan sore hari terutama terjadi di wilayah Mamasa dan Sumarorong, sementara di akhir kegiatan kondisi cuaca terjadi dengan pertumbuhan awan yang cukup cepat dan lebih banyak ditemukan awan potensial. Hasil evaluasi menunjukkan jumlah inflow selama kegiatan ini adalah sebesar 100,60 juta m3 dan rata-rata inflow sebesar 64,68 m3/detik, dengan tambahan inflow hasil TMC sebesar 16.77 juta m3. Secara umum pelaksanaan Teknologi Modifikasi Cuaca di DAS Mamasa telah berhasil meningkatkan inflow secara signifikan.Weather modification technology have been conducted in the Mamasa watershed West Sulawesi to address the deficit inflow at Bakaru Hydroelectric power plant. During the implementation of these activities the cloudiness condition in the Mamasa watershed indicated the presence of fluctuations opportunities the existence of potential clouds. In general the potential clouds is quite good enough from the beginning to the end of the activity. In early activity, cloud growth relatively happening at noon and afternoon especially was in the mamasa and sumarorong, while in the end the weather conditionsoccurring with cloud growth fast enough and more found clouds potential. Indicating the number of inflow during the evaluation of this event is worth 100,60 million cubic meter with an average inflow of 64,68 m3/second in addition to inflow 16.77 million cubic meter. In general the implementation of Weather Modification Technology in in the Mamasa watershed has had suceeded in increasing inflow  ignificantly.

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