Jon Arifian, Jon
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PENGAMATAN JANGKA PANJANG KONDISI AIR DANAU TOWUTI Tauhid, Yudi Iman; Arifian, Jon
Jurnal Sains & Teknologi Modifikasi Cuaca Vol 1, No 1 (2000): June 2000
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (173.469 KB) | DOI: 10.29122/jstmc.v1i1.2110

Abstract

Dalam tulisan ini, dikemukakan kajian awal mengenai kondisi air Danau Towuti berkenaan dengan turunnya duga muka air (DMA) secara drastis. Dengan menggunakan data harian dari 13 tahun pengamatan seperti curah hujan, duga muka air dan out flow, kemudian dihitung kesetimbangan air daerah aliran danaunya. Hasil-hasil pengamatan secara tahunan adalah, curah hujan = 2982 mm, in flow = 1821 mm, out flow = 1829 mm, penguapan = 1185 mm dan perubahan storage = - 24 mm.In this paper, a preliminary assessment of Lake Towuti water condition is outlined due to the water level is decreased drastically in recent time. Using the daily data from 13 yearsobservation such as rainfall, water level and out flow, then each component of the catchment water balance is calculted. The results of observation for annual values are, rainfall = 2982 mm, in flow = 1821 mm, out flow = 1829 mm, evaporation = 1185 mm and delta storage = - 24 mm.
KAJIAN KEGIATAN MODIFIKASI CUACA DI CATCHMENT AREA TOWUTI, SULAWESI SELATAN Arifian, Jon
Jurnal Sains & Teknologi Modifikasi Cuaca Vol 3, No 2 (2002): December 2002
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (123.09 KB) | DOI: 10.29122/jstmc.v3i2.2163

Abstract

Musim kemarau yang panjang dan fenomena el-niñ o selama tahun 1997 telah menyebabkan menurunnya sumberdaya air di tempat-tempat penyimpanannya. Adanyapenurunan tersebut menyebabkan terbatasnya jumlah air yang dapat digunakan untukberbagai aktifitas di masyarakat sehingga berdampak luas secara ekonomi. Untuk itulahmaka diterapkan teknologi modifikasi cuaca sebagai salah satu alternatif untuk mengatasi penurunan tersebut. Berbeda dengan teknik konvensional, kegiatan kali ini menerapkan teknik seeding di dasa r awan pada awan-awan yang berpotensi hujan agar terjadi penambahan curah hujan. Bahan semai yang digunakan adalah bersifat hygroscopic yang dikemas dalam bentuk flare. Secara umum selama kegiatan ini berlangsung terjadi penambahan jumlah curah hujan dan tinggi muka air danau di daerah target.Long dry season and el -ni ño phenomena during 1997 had caused the decrease of water resource in place for storing it. That decrease caused limited amount of water for various public activities and economically impacted negative. Weather modification as one of alternative technology had applied for solving it problem. Different from conventional technique, this activity had applied base cloud seeding technique on seedable cloud in order to create rainfall enhancement. Seeding agent used was hygroscopic type and was packed into flare. During this activity, there was generally increase amoun of rainfall and lake level in target area.
APLIKASI TEKNOLOGI MODIFIKASI CUACA UNTUK MENINGKATKAN CURAH HUJAN DI DAS CITARUM - JAWA BARAT 12 MARET S.D. 10 APRIL 2001 Karmini, Mimin; Nugroho, Sutopo Purwo; Tikno, Sunu; Nuryanto, Satyo; Sitorus, Baginda Patar; Bahri, Samsul; Widodo, Florentinus Heru; Arifian, Jon; Kudsy, Mahally; Goenawan, R Djoko; Yahya, Rino Bahtiar; Renggono, Findy
Jurnal Sains & Teknologi Modifikasi Cuaca Vol 2, No 1 (2001): June 2001
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (183.864 KB) | DOI: 10.29122/jstmc.v2i1.2141

Abstract

Teknologi modifikasi cuaca sudah sering diaplikasikan di Indonesia terutama untukmeningkatkan jumlah curah hujan. Teknologi modifikasi cuaca diterapkan bila terjadiindikasi penurunan jumlah curah hujan dan kemungkinan akan munculnya fenomena ElNiño sebagai tindakan preventif. Aplikasi teknologi modifikasi cuaca yang dilaksanakan diDAS Citarum, Jawa Barat mulai tanggal 12 Maret s.d. 10 April 2001 adalah berdasarkan kenyataan bahwa inflow DAS Citarum menurun dengan drastis pada bulan Desember 2000 dan sebagai tindakan preventif akan munculnya fenomena El Niño pada akhir tahun 2001 atau 2002. Pada awal tahun 2001, tiga kaskade waduk di DAS Citarum mengalami defisit cadangan air sebanyak 486,36 juta m . Waduk Ir. Juanda yang merupakan waduk multi fungsi harus menyediakan pasokan air untuk: irigasi teknis pada lahan sawah seluas 296.000 ha (2 kali tanam), yang memberikan kontribusi sebesar ± 40 % ke Jabar atau setara dengan ± 10 % Nasional; air baku permukiman dan industri; serta penyediaan tenaga listrik (± 4,5 milyar kWh). Data akhir setelah dilaksanakan penerapan teknologi modifikasi cuaca dengan menggunakan konsep sistim dan lingkungan adalah nilai rata-rata aliran total Citarum sebesar 326,81 m /det dan volume total aliran Citarum sejak mulai kegiatan hingga tanggal 10 April 2001 adalah sebesar 847,1 juta m3.Weather modification technology has been applied in Indonesia especially to enhancerainfall. Weather modification technology has been employed whenever there has beenan indication of rainfall shortage and the possibility of El Niño occurrence asprecautionary action. Weather modification technology that was applied in Citarumcatchment area – West Java on 12 March – 10 April 2001 was based on the fact thatCitarum inflow decreased drastically in December 2000 and also as a preventiveendeavor to the possibility of warm episode in 2001/2002. In the early of 2001, threecascade dams had water storage deficit as much as 486.36 million m3. Ir. Juanda dam,which has multi purposes, has to supply water for: technical irrigation for 296,000 ha ofrice field (2 planting seasons) that contributes ± 40 % to West Java or about ± 10 % ofnational production; fresh water for community and industry; as well as electricity of about 4.5 billion kWh. After the application of weather modification technology by employing system and environment concept, it was recorded that the average inflow of Citarum catchment area was 326.81 m /sec and total volume during the activity was 847.1million m3.
PREDICTION OF SOUTHERN OSCILLATION USING THE INDONESIAN THROUGHFLOW VARIABILITY Aldrian, Edvin; Arifian, Jon
Marine Research in Indonesia Vol 34, No 1 (2009)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/mri.v34i1.516

Abstract

Atmospheric boundary layer derived from NCEP/NCAR reanalyses for the period of 1974 to 2002 has been used as boundary forcings for the global ocean model Max Planck Institute Ocean Model (MPIOM). The ocean model is a curvilinear grid model, whose poles are located over mainland China and over the Australian continent, thus focusing on the maritime continent. The model simulates major Indonesian throughflow passages that focus on six cannels representing three inlets and three outlets (the Makassar, Lifamatola, Halmahera, Lombok, Ombai and Timor Straits). The model results have been validated using the Arlindo observation Project over the Makassar Strait in the period of January 1997 to February 1998, which fortunately was during a strong El Niño episode. The model simulation results were then investigated for their prediction capabilities of any of those channels in foreseeing the incoming southern oscillation events. Temporal correlation analysis with lag and advance time correlation methods were performed against simulated data at all levels on those channels. Variabilities in depth of 74 to 200m (thermocline depth) show the strongest correlation with SOI index (Darwin minus Tahiti mean sea level pressure). The temperature and salinity correlations with SOI are the highest with one-month in advance over Lifamatola Strait (0.77) and two-month in advance over the Makassar Straits (0.74). These significant correlations highlight the important of those two straits in prediction of incoming southern oscillation that usually leads to ENSO episode which brings most of the time devastating impact to economy, agriculture and ecosystem.
PREDICTION OF SOUTHERN OSCILLATION USING THE INDONESIAN THROUGHFLOW VARIABILITY Aldrian, Edvin; Arifian, Jon
Marine Research in Indonesia Vol 34 No 1 (2009)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/mri.v34i1.516

Abstract

Atmospheric boundary layer derived from NCEP/NCAR reanalyses for the period of 1974 to 2002 has been used as boundary forcings for the global ocean model Max Planck Institute Ocean Model (MPIOM). The ocean model is a curvilinear grid model, whose poles are located over mainland China and over the Australian continent, thus focusing on the maritime continent. The model simulates major Indonesian throughflow passages that focus on six cannels representing three inlets and three outlets (the Makassar, Lifamatola, Halmahera, Lombok, Ombai and Timor Straits). The model results have been validated using the Arlindo observation Project over the Makassar Strait in the period of January 1997 to February 1998, which fortunately was during a strong El Niño episode. The model simulation results were then investigated for their prediction capabilities of any of those channels in foreseeing the incoming southern oscillation events. Temporal correlation analysis with lag and advance time correlation methods were performed against simulated data at all levels on those channels. Variabilities in depth of 74 to 200m (thermocline depth) show the strongest correlation with SOI index (Darwin minus Tahiti mean sea level pressure). The temperature and salinity correlations with SOI are the highest with one-month in advance over Lifamatola Strait (0.77) and two-month in advance over the Makassar Straits (0.74). These significant correlations highlight the important of those two straits in prediction of incoming southern oscillation that usually leads to ENSO episode which brings most of the time devastating impact to economy, agriculture and ecosystem.
PENGAMATAN JANGKA PANJANG KONDISI AIR DANAU TOWUTI Tauhid, Yudi Iman; Arifian, Jon
Jurnal Sains & Teknologi Modifikasi Cuaca Vol 1, No 1 (2000): June 2000
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (173.469 KB) | DOI: 10.29122/jstmc.v1i1.2110

Abstract

Dalam tulisan ini, dikemukakan kajian awal mengenai kondisi air Danau Towuti berkenaan dengan turunnya duga muka air (DMA) secara drastis. Dengan menggunakan data harian dari 13 tahun pengamatan seperti curah hujan, duga muka air dan out flow, kemudian dihitung kesetimbangan air daerah aliran danaunya. Hasil-hasil pengamatan secara tahunan adalah, curah hujan = 2982 mm, in flow = 1821 mm, out flow = 1829 mm, penguapan = 1185 mm dan perubahan storage = - 24 mm.In this paper, a preliminary assessment of Lake Towuti water condition is outlined due to the water level is decreased drastically in recent time. Using the daily data from 13 yearsobservation such as rainfall, water level and out flow, then each component of the catchment water balance is calculted. The results of observation for annual values are, rainfall = 2982 mm, in flow = 1821 mm, out flow = 1829 mm, evaporation = 1185 mm and delta storage = - 24 mm.
KAJIAN KEGIATAN MODIFIKASI CUACA DI CATCHMENT AREA TOWUTI, SULAWESI SELATAN Arifian, Jon
Jurnal Sains & Teknologi Modifikasi Cuaca Vol 3, No 2 (2002): December 2002
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (123.09 KB) | DOI: 10.29122/jstmc.v3i2.2163

Abstract

Musim kemarau yang panjang dan fenomena el-niñ o selama tahun 1997 telah menyebabkan menurunnya sumberdaya air di tempat-tempat penyimpanannya. Adanyapenurunan tersebut menyebabkan terbatasnya jumlah air yang dapat digunakan untukberbagai aktifitas di masyarakat sehingga berdampak luas secara ekonomi. Untuk itulahmaka diterapkan teknologi modifikasi cuaca sebagai salah satu alternatif untuk mengatasi penurunan tersebut. Berbeda dengan teknik konvensional, kegiatan kali ini menerapkan teknik seeding di dasa r awan pada awan-awan yang berpotensi hujan agar terjadi penambahan curah hujan. Bahan semai yang digunakan adalah bersifat hygroscopic yang dikemas dalam bentuk flare. Secara umum selama kegiatan ini berlangsung terjadi penambahan jumlah curah hujan dan tinggi muka air danau di daerah target.Long dry season and el -ni ño phenomena during 1997 had caused the decrease of water resource in place for storing it. That decrease caused limited amount of water for various public activities and economically impacted negative. Weather modification as one of alternative technology had applied for solving it problem. Different from conventional technique, this activity had applied base cloud seeding technique on seedable cloud in order to create rainfall enhancement. Seeding agent used was hygroscopic type and was packed into flare. During this activity, there was generally increase amoun of rainfall and lake level in target area.
APLIKASI TEKNOLOGI MODIFIKASI CUACA UNTUK MENINGKATKAN CURAH HUJAN DI DAS CITARUM - JAWA BARAT 12 MARET S.D. 10 APRIL 2001 Karmini, Mimin; Nugroho, Sutopo Purwo; Tikno, Sunu; Nuryanto, Satyo; Sitorus, Baginda Patar; Bahri, Samsul; Widodo, Florentinus Heru; Arifian, Jon; Kudsy, Mahally; Goenawan, R Djoko; Yahya, Rino Bahtiar; Renggono, Findy
Jurnal Sains & Teknologi Modifikasi Cuaca Vol 2, No 1 (2001): June 2001
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (183.864 KB) | DOI: 10.29122/jstmc.v2i1.2141

Abstract

Teknologi modifikasi cuaca sudah sering diaplikasikan di Indonesia terutama untukmeningkatkan jumlah curah hujan. Teknologi modifikasi cuaca diterapkan bila terjadiindikasi penurunan jumlah curah hujan dan kemungkinan akan munculnya fenomena ElNiño sebagai tindakan preventif. Aplikasi teknologi modifikasi cuaca yang dilaksanakan diDAS Citarum, Jawa Barat mulai tanggal 12 Maret s.d. 10 April 2001 adalah berdasarkan kenyataan bahwa inflow DAS Citarum menurun dengan drastis pada bulan Desember 2000 dan sebagai tindakan preventif akan munculnya fenomena El Niño pada akhir tahun 2001 atau 2002. Pada awal tahun 2001, tiga kaskade waduk di DAS Citarum mengalami defisit cadangan air sebanyak 486,36 juta m . Waduk Ir. Juanda yang merupakan waduk multi fungsi harus menyediakan pasokan air untuk: irigasi teknis pada lahan sawah seluas 296.000 ha (2 kali tanam), yang memberikan kontribusi sebesar ± 40 % ke Jabar atau setara dengan ± 10 % Nasional; air baku permukiman dan industri; serta penyediaan tenaga listrik (± 4,5 milyar kWh). Data akhir setelah dilaksanakan penerapan teknologi modifikasi cuaca dengan menggunakan konsep sistim dan lingkungan adalah nilai rata-rata aliran total Citarum sebesar 326,81 m /det dan volume total aliran Citarum sejak mulai kegiatan hingga tanggal 10 April 2001 adalah sebesar 847,1 juta m3.Weather modification technology has been applied in Indonesia especially to enhancerainfall. Weather modification technology has been employed whenever there has beenan indication of rainfall shortage and the possibility of El Niño occurrence asprecautionary action. Weather modification technology that was applied in Citarumcatchment area ? West Java on 12 March ? 10 April 2001 was based on the fact thatCitarum inflow decreased drastically in December 2000 and also as a preventiveendeavor to the possibility of warm episode in 2001/2002. In the early of 2001, threecascade dams had water storage deficit as much as 486.36 million m3. Ir. Juanda dam,which has multi purposes, has to supply water for: technical irrigation for 296,000 ha ofrice field (2 planting seasons) that contributes ± 40 % to West Java or about ± 10 % ofnational production; fresh water for community and industry; as well as electricity of about 4.5 billion kWh. After the application of weather modification technology by employing system and environment concept, it was recorded that the average inflow of Citarum catchment area was 326.81 m /sec and total volume during the activity was 847.1million m3.