I Wayan Sutapa
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Pattimura University, Jl. Ir. M. Putuhena Kampus - Poka, Ambon, Maluku 97234

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Studi Pengaruh dan Hubungan Bentuk DAS Terhadap Parameter Hidrograf Satuan Sintetik Sutapa, I Wayan
SMARTek Vol 4, No 4 (2006)
Publisher : SMARTek

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Abstract

Hidrograf Satuan dapat digunakan sebagai salah satu metode untuk menghitung debit banjir rancangan yang diturunkan dari data hujan dan pengukuran debit dari suatu Daerah Aliran Sungai (DAS). Hidrograf Satuan hanya berlaku untuk DAS yang bersangkutan dan hanya pada titik dimana pengukuran debit dilakukan. Keterbatasan data dan keterbatasan berlakunya Hidrograf Satuan memunculkan gagasan untuk mengembangkan Hidrograf Satuan Sintetik (HSS). Dalam penelitian ini  dibuat model parameter Hidrograf Satuan Sintetik (HSS) seperti debit puncak(Qp), waktu puncak (Tp) dan waktu dasar (Tb) dengan karakteristik fisik faktor bentuk DAS, sebagai variabel tunggal dalam pemodelan. Pemodelan parameter Hidrograf Satuan Sintetik (HSS) menggunakan metode statistik regresi, dimana parameter HSS (Qp, Tp dan Tb) sebagai variabel tidak bebas dan faktor bentuk DAS (FD) sebagai variabel bebas. Hasil penelitian ini adalah faktor bentuk DAS mempunyai hubungan linier yang kuat. Hal ini ditunjukkan oleh nilai koefisien korelasi terhadap parameter Hidrograf Satuan Sintetik (Qp, Tp dan Tb). Model terpilih untuk Qp = 0,3751 FD-2,7457 dengan koefesien determinasi, R2 = 0,9986,    Tp = 30,0621FD- 2,9864 dengan koefisien determinasi, R2 = 0,7496 dan Tb = 35,4835 FD +14,6429 dengan koefesien determinasi, R2 = 0,9862.
STUDI POTENSI PENGEMBANGAN SUMBER DAYA AIR DI KOTA AMPANA SULAWESI TENGAH Sutapa, I Wayan
SMARTek Vol 7, No 1 (2009)
Publisher : SMARTek

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Abstract

Tujuan studi ini adalah untuk mengetahui potensi sumber air untuk memenuhi kebutuhan airminum di Kota Ampana dan memilih alternatif sumber air yang paling optimal dari potensisumber daya air yang ada. Metode yang digunakan berupa survey pendahuluan untukmengetahui kondisi sungai-sungai yang ada, vegetasi penutup lahan dan kondisi sosial ekonomipenduduk Kota Ampana. Survey ini dilakukan dengan mengukur debit sungai, pendataanpenggunaan lahan, data jumlah penduduk dan mendata sarana dan prasarana yang ada.Data kependudukan didapat dari Kantor Badan Pusat Statistik (BPS) di Palu. Data hujan &klimatologi digunakan Stasiun Hek Bunta yang didapat dari Kantor Balai Wilayah Sungai SulawesiIII di Palu. Pengolahan data dilakukan dengan menggunakan rumus-rumus empiris dari kajianpustaka, yakni: menghitung evapotrasnpirasi dengan Metode Penman Modifikasi ; menghitungdebit andalan dengan Metode FJ Mock, Smec dan pengukuran langsung; menghitungkebutuhan air, proyeksi sampai tahun 2027 dan menghitung neraca air dari alternatif sumber air.Hasil analisis kebutuhan dan ketersediaan air (neraca air) menunjukkan bahwa jika air SungaiAmpana dan Sungai Sansarino saja digunakan untuk keperluan air minum, maka sampai proyeksitahun 2027 belum mampu untuk mencukupi kebutuhan air Kota Ampana. Untuk itu perludikembangkan dari sumber lain, yakni Sungai Padauloyo
ANALISIS POTENSI EROSI PADA DAERAH ALIRAN SUNGAI (DAS) DI SULAWESI TENGAH Sutapa, I Wayan
SMARTek Vol 8, No 3 (2010)
Publisher : SMARTek

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Abstract

Tujuan penelitian ini untuk mengetahui potensi erosi yang terjadi di beberapa DAS di Sulawesi Tengah dan upaya yang perlu ditempuh untuk meningkatkan produktivitas lahan guna mendukung pertumbuhan tanaman dan menurunkan atau menghilangkan dampak negatif pengelolaan lahan. Penelitian ini dilakukan di Kabupaten Touna, Donggala, Banggai dan Kota Palu dengan memilih DAS dari setiap kabupaten secara acak. Besarnya erosi dihitung dengan metode empiris USLE dan menggunakan perangkat lunak Arcview GIS. Hasil penelitian menunjukkan bahwa klasifikasi bahaya erosi bervariasi mulai sangat ringan sampai sangat berat. Di Kabupaten Touna bahaya erosinya tergolong sangat ringan yag menunjukkan kondisi DASnya sangat baik. Di Kabupaten Donggala klasifikasi bahaya erosi sangat berat, yang kemungkinan kondisi hutan sudah kritis. Sedangkan di kabupaten yang lain bervariasi dari ringan sampai sedang
STUDI INVENTARISASI POTENSI EMBUNG WILAYAH SUNGAI PARIGI POSO Sutapa, I Wayan
SMARTek Vol 8, No 4 (2010)
Publisher : SMARTek

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Abstract

Tujuan studi ini untuk menginventarisasi sungai-sungai yang potensial dijadikan lokasi embung untuk memenuhi kebutuhan air penduduk di sekitarnya dan mengetahui debit yang tersedia pada sungai tersebut. Metodologi yang digunakan adalah pengumpulan data dari instansi terkait, survai lapangan, pemilhan lokasi embung dan analisis kebutuhan & ketersediaan air di sungai. Berdasarkan kriteria pemilihan lokasi embung dengan keempat aspek, nilai modifikasi bobot pertimbangan dan pertimbangan salah satu aspek saja maka disimpulkan nilai lokasi yang tertinggi adalah Embung Parigimpu. Neraca air Embung Parigimpu menunjukkan terjadi kekurangan air, baik untuk tahun dasar perencanaan (2009) maupun proyeksi sampai tahun 2025. Artinya di lokasi ini perlu dibangun embung yang berfungsi untuk menampung air saat musim penghujan dan mendistribusikannya pada saat musim kemarau.Kata Kunci : Daerah Aliran Sungai, Nilai lokasi dan neraca air
KAJIAN HIDROGRAF SATUAN SINTETIK NAKAYASU UNTUK PERHITUNGAN DEBIT BANJIR RANCANGAN DI DAERAH ALIRAN SUNGAI KODINA Sutapa, I Wayan
MEKTEK Vol 7, No 1 (2005)
Publisher : MEKTEK

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Abstract

Analyse of the design discharge in the catchment area can be used by some methods, one of them is Synthetic Unit Hydrograph Nakayasu. In this method applying need presumably studied so that result got well enough. The Synthetic Unit Hydrograph Nakayasu try applied in catchment area Kodina in Central Sulawesi to look for the level of deviation of Synthetic Unit Hydrograp Nakayasu with the measured unit hydrograph. Modification of Equation of Synthetic Unit Hydrograph Nakayasu conducted by degrading basic formula the time peak (Tp) from value Tr and peak discharge (Qp) from equation T03 in the form of value α (discharge coefficient). As the result of research show happened by the big enough deviation to nature of the basic unit hydrograph of namely for the Tp = 26% and Qp = 22,40%. So,  Synthetic Unit Hydrograph  Nakayasu cannot be used direct to calculate the design discharge in catchment area Kodina. It’s required research of a kind to Synthetic Unit Hydrograp Nakayasu to look for the coefficient  from value of Tp and Qp
STUDI POTENSI EMBUNG SUB WILAYAH SUNGAI WATUTELA WUNO DI WILAYAH KOTA PALU DAN KABUPATEN DONGGALA SULAWESI TENGAH Sutapa, I Wayan
MEKTEK Vol 10, No 1 (2008)
Publisher : MEKTEK

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Abstract

Regional river of Watutela Wuno which is located in Palu and Donggala Regency in Central Sulawesi represent the valley area encircled by mountain with many river emit a stream of among other things later on have estuary to Palu river. The river is very potential developed as water resource to fulfill amount of water required of resident especially at dry season by developing a dam. This study is to know the potential river or location to be made dam location to fulfilling amount of water required resident, livestock and garden and also know the amount water availability at the river. Method used by data collecting from related institution, survey field and analyze the condition of location of candidate dam and also test the sensitivity to determine the development priority. From the analysis got that Ngia dam in Ngatabaru village most important to can be developed with the consideration of various aspects.
RASIONALISASI POS HIDROLOGI PADA SATUAN WILAYAH SUNGAI (SWS) LAMBUNU – BUOL DENGAN METODE KAGAN Sutapa, I Wayan
MEKTEK Vol 11, No 3 (2009)
Publisher : MEKTEK

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Abstract

The aim of this research is to get post network of hydrology efficient, effective and can deputize a catchment area so that earn minimization of is expense of required for the operation and conservancy. Data the used is monthly rainfall during 10 years start from year 1997 till 2006. Method which is used in data analysis that is method of Kagan. Pursuant to result of Method analysis of Kagan for the SWS of Lambunu-Buol with amount of existing rain post in this time amount to 13 posts with mistake of calculation according to result of analysis 2,814 % obtained by distance between post 45,199 km, amountly have answered the demand of but spreading of rain post not yet fulfilled what required by Kagan, so that require to be conducted by post reposition. Existing posts will be reposition are Station of Tada, Kayu Agung, Ongka, Lalos and Air Terang
ANALYSIS OF HYDROGEN ADSORPTION AND DIFFUSION ON Mg(0001) SURFACE: AN AB INITIO DFT STUDY Sutapa, I Wayan; Amunanto, Ria; Wijaya, Karna
Jurnal Sains dan Terapan Kimia Vol 4, No 1 (2010)
Publisher : Jurnal Sains dan Terapan Kimia

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Abstract

Ab initio density functional theory (DFT) calculations are performed to study the adsorption ofH2 molecules on a Mg(0001) surface. First, the adsorption energy was investigated. In thecalculation of the adsorption process of molecular hydrogen, observation showed a physicaladsorption of molecular hydrogen rather than chemisorptions.The diffusion process of atomichydrogen on Mg (0001) was also presented. Finally, we are comparing all of our calculationwith results from previous experiments.Keyword: DFT, Adsorption, Diffusion, Mg(0001), H2
APLIKASI MODEL MANN-KENDALL DAN SEN’S (MAKESENS) UNTUK MENDETEKSI PERUBAHAN IKLIM Sutapa, I Wayan
JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR Vol 4, No 1 (2014)
Publisher : JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR

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Abstract

Various scientific studies illustrate that carbon dioxide (CO2) in the atmosphere layer that is a consequence of the result of the combustion of coal, timber, oil and gas, has increased by almost nearing 20 % since the start of the industrial revolution. Industrial area are built almost in the entire continent of the world has resulted in waste of “Greenhouse Gases (GHG) such as carbon dioxide (CO2), methane (CH4) and nitrousoksida (N2O) that caused the blanket effect. The purpose of this research was to detect the presence or absence of climate change and determine the projected climate change due to global warming. This research was conducted in the city of Palu, Central Sulawesi, using daily data and analyzed on a daily, monthly and yearly. Trend projections of climate change and changes in the method of analysis Makesens (Mann - Kendall and Sen S). The conclusion of this research is the change of climate in the city of Palu is characterized by slowly increasing temperature , increased precipitation and decreased evapotranspiration and the results of the calculation value of Z indicates Makesens method occurs climate trend, either positive direction (increasing) and negative (decreasing). Regression equation projected annual average temperature (as an example) is; f (year) = 0.018 (year - first year) + 26.931. Keywords: climate change, Makesens, Palu
Waste Cooking Oil Conversion To Biodeisel Catalized By Egg Shell Of Purebred Chiken With Ethanol As A Solvent Tehubijuluw, Hellna; Sutapa, I Wayan; Lethulur, Mealan
Eksakta: Jurnal Ilmu-Ilmu MIPA VOLUME 14, ISSUE 1, February 2014
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

The synthesis of biodiesel from the waste cooking oil was carried out using the catalyst from egg shell of purebred chiken with ethanol as a solvent. Synthesis of biodiesel was prepared in two steps, esterification and transesterification. Esterification was conducted in mol ratio of ethanol and waste cooking oil of  9:1 with H2SO4 as a catalyst. Mol ratio of ethanol and used cooking oil in the transesterification of  12:1 with the CaO catalyst of shell eggs. CaO catalyst was yielded by calcinations egg shell of purebred chicken on 1000 for two hours. Calcination product was characterized with XRD to determine of CaO. Result of biodiesel was characterized based on FTIR, H-NMR, dan ASTM (American Standard Testing of Materials). Theoretically,yielded of biodiesel was 58% and experiment was 36.779%.