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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. 12 No. 2 (2011): December 2011" : 5 Documents clear
STUDI MODEL UNTUK PENINGKATAN PRESIPITASI AWAN KONVEKTIF DENGAN BUBUK GARAM Belyaeva M. V; Drofa A.S; Ivanov V.N; Mahally Kudsy; Untung Haryanto; R Djoko Goenawan; Dini Harsanti; Ridwan Ridwan
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 12 No. 2 (2011): December 2011
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v12i2.2188

Abstract

Sebuah studi tentang penggunaan garam serbuk polidispersi sebagai bahan semaitelah dilaksanakan dengan memakai model 1-dimensi. Dalam studi ini pengaruhpenambahan serbuk garam tersebut terhadap distribusi tetes awan dan jumlah penambahan presipitasi telah dilakukan, serta hasilnya telah dianalisa dan dibandingkan dengan hasil yang diperoleh pada pemakaian partikel higroskopis yang diperoleh dari flare piroteknik. Kondisi awan yang dipelajari terdiri dari beberapa macam ketinggian, updraft dan konsentrasi inti kondensasi atmosfer semula. Hasil studi menunjukkan bahwa bubuk garam polidisperse dapat dipakai untuk menghasilkan presipitasi dari awan marginal yang biasanya tidak mampu menghasilkan presipitasi.A study of use of polydisperse salt as seeding agent in cloud modification was conducted using 1-dimensional model. In this study the effects of introduction of the salt powder to cloud droplet distribution and the amount of precipitation enhancement were analyzed and compared to the results obtained by introduction of hygroscopic particles from pyrotechnic flares at various cloud media conditions such as cloud thickness, updraft, and original atmospheric condensation nuclei. This study reveals that polydisperse salt powder is usable to obtain precipitation from marginal cloud that usually can not produce precipitation.
MENGINTIP KONDISI CUACA PENYEBAB BANJIR BESAR DI DKI JAKARTA TANGGAL 25 OKTOBER 2010 Mimin Karmini; Findy Renggono
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 12 No. 2 (2011): December 2011
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v12i2.2189

Abstract

DKI Jakarta dikejutkan dengan hujan deras pada jam 16:00 WIB. Genangan airlangsung terjadi akibat derasnya hujan. Hujan berlangsung sampai sekitar jam 20:00WIB. Dari data AWS di Jatiwaringin, curah hujan tertinggi sebesar 230 mm tercatatpada jam 16:00 WIB. Curah hujan sampai jam 19:00 WIB tercatat sebesar 650.60 mmatau intensitas 216.87 mm/jam untuk periode jam 16:00 s.d. 19:00 WIB. Beberapaindeks stabilitas, yang dihitung dari data rawinsonde jam 07:00 WIB, menunjukanpotensi terjadinya aktivitas konvektif yang bisa menghasilkan hujan deras. Beberapaindeks stabilitas yang menunjukan potensi terjadinya proses konvektif kuat adalah: LI(Lifted Index) = - 06; SI (Showalter Index) = - 0.7; K Index = 36.7; TT (Total Totals) =43.9. Kejadian hujan paling deras di kawasan barat DKI Jakarta sampai Tangerang.Genangan air hampir merata di DKI Jakarta dan Tangerang dengan ketinggian yangbervariasi antara 20 cm – 100 cm.Jakarta was struck by torrential rain at 16:00 pm. Standing water caused by heavy rainoccured immediately. The rain lasted until around 20:00 pm. From the AWS measurement at Jatiwaringin, highest rainfall of 230 mm was recorded at 16:00 pm. Rainfall amount until 19:00 pm was recorded of about 650.60 mm, in other words rainfall intensity was about 216.87 mm/hour for the period of 16:00 – 19:00 pm. Some stability indices, which is calculated from rawinsonde at 07:00 am showed the potential for convective activity which could produce heavy rain. Some stability indices that show strong potential for convective process are: LI (Lifted Index) = - 06; SI (Showalter Index) = - 0.7; K Index = 36.7; TT (Total Totals) = 43.9. The heaviest rainfall occured in the western region of Jakarta until Tangerang. Stagnant water is almost evenly in Jakarta and Tangerang with varying heights between 20 cm - 100 cm.
OBSERVASI PERTUMBUHAN AWAN DI DAS MAMASA SULAWESI BARAT DENGAN RADAR CUACA Erwin Mulyana
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 12 No. 2 (2011): December 2011
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v12i2.2190

Abstract

Telah dilakukan pengamatan awan di DAS Mamasa berdasarkan data X-band Mobile Radar untuk mengetahui karakteristik pertumbuhan awan di daerah tersebut. Pengamatan awan dilakukan pada saat kegiatan penyemaian awan tangal 21 Oktober - 19 November 2009. Hasil pengamatan menunjukkan bahwa pertumbuhan awan di DAS Mamasa dipengaruhi oleh proses orografik dan arah angin. Pada saat angin baratan, pertumbuhan awan terkonsentrasi di sisi bagian barat DAS Mamasa. Sebaliknya, pertumbuhan awan terkonsentrasi di sisi bagian timur DAS Mamasa ketika terjadi angin timuran.Study on the characteristic of cloud development at Mamasa catchment area is very important since the water supply for Bakaru hydro-electric power is highly depend on the rain fall over this area. During rain enhancement project on 21 October to 19 November 2009, convective clouds have been analized based on X-band mobile weather radar observation over Mamasa River catchment area. The observation result shows that cloud development in this area are influenced by orographic processes and wind direction. During westerly wind, the clouds developed over the western part of catchment area. On the contrary, the clouds were observed over the east side of cathment area during easterly wind.
DISTRIBUSI TEMPORAL DAN SPASIAL TEKANAN UDARA TERKAIT PERTUMBUHAN AWAN DI DAS LARONA, SULAWESI SELATAN Tri Handoko Seto
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 12 No. 2 (2011): December 2011
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v12i2.2191

Abstract

Telah dilakukan análisis temporal dan spasial data tekanan udara dan curah hujan menggunakan data hasil pengukuran dengan AWS dan penakar hujan manual di DASLarona, Sulawesi Selatan. Dari hasil analisis temporal nampak bahwa tekanan udarapermukaan cenderung turun saat pertumbuhan awan. Penurunan tekanan menjadi energi yang digunakan untuk menarik massa udara di sekitarnya. Ketika terjadi hujan maka tekanan udara menjadi tinggi akibat adanya pendinginan masa udara. Dari analisisspasial nampak bahwa daerah yang memiliki tekanan lebih rendah cenderung memilikicurah hujan yang lebih tinggi dibandingkan dengan daerah-daerah di sekitarnya. Hasilpenelitian ini bisa dijadikan referensi bahwa ketika terjadi pertumbuhan awan di suatulokasi maka aliran udara akan masuk menuju lokasi pertumbuhan awan. Semakin kuat pertumbuhan awannya maka semakin kuat tarikan massa udara dari sekitarnya. Dalam teknologi modifikasi cuaca, usaha memperkuat pertumbuhan awan mungkin bisa dijadikan salah satu strategi untuk menarik massa udara atau awan-awan yang lebih kecil ke area dengan pertumbuhan awan yang kuat. Namun masih perlu dilakukan penelitian lebih lanjut untuk membuktikan hipotesa ini.Temporal and spatial data analysis of air pressure and rainfall data using AWS andrain gauges in the watershed of Larona, South Sulawesi has been done. From theresults it appears that surface air pressure tends to fall when clouds develop. Pressuredecreasing became energy which is used to draw air mass from the vicinity. When itrains then the air pressure increased due to the cooling of the air. From the spatialanalysis it appears that areas with lower pressure tend to have higher rainfall than thesurrounding areas. The results of this study can be used as a reference that when thereis cloud growth in a location, air flow will go to the location of cloud growth. The stronger cloud’s growth the stronger pull of the surrounding air mass. In weather modification technology, strengthen the growth of cloud technique may be used as one strategy to attract the mass of air or clouds of smaller clouds to the area with strong growth. But it still needs to do further research to prove this hypothesis.
PENGARUH ENSO TERHADAP POLA ANGIN DAN CURAH HUJAN DI DAS LARONA, SULAWESI SELATAN Findy Renggono
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 12 No. 2 (2011): December 2011
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v12i2.2192

Abstract

Ketersediaan air di danau-danau yang berada di DAS Larona sangat penting karenaair yang mengalir keluar dari danau digunakan untuk menggerakkan turbin pembangkitlistrik. Kajian pola cuaca dan iklim di wilayah ini sangat dibutuhkan untuk mengetahuiwaktu yang tepat dalam melakukan tindakan antisipasi kekurangan air, termasuk mengadakan kegiatan teknologi modifikasi cuaca untuk menambah curah hujan. Hasilanalisis dengan data angin permukaan NCEP menunjukkan bahwa pola pergerakanangin di wilayah ini dipengaruhi oleh kondisi ENSO. Pada saat El Nino Angin Timuranbertambah kuat, dan angin dari selatan melemah. Curah hujan pada saat El Nino dapatberkurang sampai 22% dari normalnya, namun pada saat La Nina dapat bertambahsebesar 50%.Water availability in Larona watershed is very important as it is used to drive turbinesof Hydro electric power. Study of weather and climate patterns is needed to anticipatedwater shortages, as well as to conduct the weather modification technology for rainenhancement. NCEP surface wind data analysis indicate that the pattern of windmovement in the region is affected by ENSO. During El Nino, easterly wind is gettingstronger, and the southerly wind is weaker. during El Nino rainfall reduced to 22% ofnormal, but during La Nina it increased by 50%.

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