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PENENTUAN AWAL DAN DURASI MUSIM KEMARAU MENGGUNAKAN FUNGSI POLYNOMIAL DENGAN APLIKASI VISUAL BASIC FOR APPLICATIONS (VBA) Irsyad, Fadli; Saptomo, Satyanto Krido; Setiawan, Budi Indra
Agromet Vol. 28 No. 1 (2014)
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/j.agromet.28.1.40-46

Abstract

Forecasting the occurrence of the onset of dry season and its length is important in determining the availability of water for irrigation, domestic and industrial uses. The length of dry season is used for reference in calculating water demand. Prediction of drought can be studied based on the rainfall patterns that have occurred. This is possible because there is a tendency that the rain will repeat a certain pattern at a certain time. The purpose of this study was to predict the onset of dry and rainy seasons as well as their length. Determination of the onset of dry season and its length was conducted using polynomial function of the cumulative amount of rain every single day based on the rain data. The research was conducted using rainfall data from Climate Station III in Serang from 1989 to 2010. The sum of daily rainfall could form a polynomial function. If the magnitude of daily rainfall in a certain period of time is less than the slope of the cumulative annual rainfall, then at that time the dry season is occurred. Determination of the dry season peak can be done by finding the maximum (extreme) point from the polynomial function by getting the second derivative which value is close or equal to zero. In average, the dry season occurred in Serang city started on the 132nd until 300th day. Deviation value for the onset of dry and rainy seasons were 23 and 38 days, respectively, with an average of length of 168 days. The average of R2 value for polynomial function was 0.9937.
PENDUGAAN FLUKS PANAS DAN EVAPOTRANSPIRASI DENGAN JARINGAN SYARAF TIRUANHEAT FLUX AND EVAPOTRANSPIRATION ESTIMATION USING ARTIFICIAL NEURAL NETWORK Saptomo, Satyanto Krido
Agromet Vol. 25 No. 1 (2011): JUNE 2011
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/j.agromet.25.1.24-28

Abstract

Artificial neural network (ANN) approach was used to model energy dissipation process into sensible heat and latent heat (evapotranspiration) fluxes. The ANN model has 5 inputs which are leaf temperature Tl, air temperature Ta, net radiation Rn, wind speed uc and actual vapor pressure ea. Adjustment of ANN was conducted using back propagation technique, employing measurement data of input and output parameters of the ANN. The estimation results using the adjusted ANN shows its capability in resembling the heat dissipation process by giving outputs of sensible and latent heat fluxes closed to its respective measurement values as the measured input values are given.  The ANN structure presented in this paper suits for modeling similar process over vegetated surfaces, but the adjusted parameters are unique. Therefore observation data set for each different vegetation and adjustment of ANN are required.
ANALISIS PERUBAHAN IKLIM LOKAL DAN DEBIT SUNGAI DI DAS CIDANAUANALYSIS OF LOCAL CLIMATE CHANGE AND DISCHARGE IN CIDANAU WATERSHED Irsyad, Fadli; Saptomo, Satyanto Krido; Setiawan, Budi Indra
Agromet Vol. 25 No. 1 (2011): JUNE 2011
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/j.agromet.25.1.17-23

Abstract

Climate change causes uncertainty in water availability. The change may include annual rainfall, evapotranspiration and the shift of rainy and dry seasons, thus, it affects hydrological response in the region. Water demand will increase over time with population, industrial and business growth but the water availability has not been ascertained to sustainably satisfy those needs.  Cidanau Watershed has wetland ecosystem so-called the Rawa Danau (Caldera), with an area of around 2,500 ha. This watershed receives average annual rainfall around 2,500 mm. Climate change especially the local climate in the region of Cidanau was analyzed to illustrate how the relationship with Cidanau river discharge. It is expected that climate change does not affect the water availability in the watershed. In this study, the analysis of local climate change and its impact on the availability of water resources on Cidanau Watershed was based on climate trends, water balance analysis, and estimation of  discharge of Cidanau Watershed. This research was carried out using climate data and discharge from 1996 until 2010. The results showed that climate variables have changed from 1996 to 2010. This change mainly occurred in temperature, annual rainfall, and evapotranspiration. Based on the analysis, the discharge of Cidanau Watershed will decrease due to changes in rainfall and evapotranspiration. The estimated minimum river discharge of Cidanau Watershed ranges from 0.5 to 1 m3/s until 2050.
EVALUASI KINERJA UNIT INSTALASI PENGOLAHAN AIR LIMBAH BOJONGSOANG BANDUNG Firdaus, Muhammad Ihsan; Saptomo, Satyanto Krido; Febrita, Joana
Jurnal Teknik Sipil dan Lingkungan Vol. 3 No. 1: April 2018
Publisher : Departemen Teknik Sipil dan Lingkungan, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (371.757 KB) | DOI: 10.29244/jsil.3.1.35-48

Abstract

Abstrak: Pengolahan air limbah diperlukan agar kualitas air limbah sesuai dengan baku mutu dan tidak membahayakan lingkungan. Tujuan penelitian ini adalah mengetahui kualitas air limbah berdasarkan parameter BOD, COD, TSS, dan pH di influen serta efluen masing-masing unit instalasi pengolahan air limbah (IPAL), membandingkan efisiensi penurunan konsentrasi pencemar dengan literatur, dan membandingkan kualitas air limbah di outlet dengan baku mutu. Penelitian menggunakan sampel yang diambil di IPAL Bojongsoang Bandung dan pengujian dilakukan di Laboratorium PDAM Kota Bandung. Efisiensi pengurangan pencemar terbesar pada unit set A yaitu untuk parameter TSS 66,67%, BOD 87,55%, dan COD 81,28%. Pada unit set B efisiensi pengurangan pencemar terbesar adalah parameter TSS sebesar 55,88%, BOD 73,91%, dan COD 73,05%. Unit pengolahan di set A telah memenuhi syarat untuk parameter BOD dan COD untuk oxidation ditch (80-90%). Konsentrasi di outlet pada unit set A untuk TSS 50 mg/l, BOD 27 mg/l, COD 67 mg/l, dan pH 6,5, sedangkan di unit set B untuk TSS 75 mg/l, BOD 21 mg/l, COD 45 mg/l, dan pH 6,5. Dibandingkan dengan baku mutu yang berlaku nilai parameter COD dan pH telah memenuhi standar.Kata kunci: BOD, COD, evaluasi kinerja, IPAL, pH, TSS
SEBARAN INTRUSI AIR LAUT DI KABUPATEN INDRAMAYU, JAWA BARAT Hafiidh, Ahmad Abdul; Saptomo, Satyanto Krido; Arif, Chusnul
Jurnal Teknik Sipil dan Lingkungan Vol. 3 No. 2: Agustus 2018
Publisher : Departemen Teknik Sipil dan Lingkungan, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (688.064 KB) | DOI: 10.29244/jsil.3.2.69-76

Abstract

Wilayah terluas sebagai penghasil beras di Pulau Jawa adalah Kabupaten Indramayu. Sebagian besar Kabupaten Indramayu berada di daerah pesisir, airtanah menjadi sumberdaya yang sangat dibutuhkan untuk irigasi pertanian. Eksploitasi yang berlangsung secara terus menerus dan volum yang semakin meningkat dari waktu ke waktu menyebabkan terbentuknya ruang kosong di lapisan akuifer sehingga ruang kosong pada tanah kemudian diisi oleh air laut. Pada penelitian ini Jaringan Saraf Tiruan (JST) digunakan untuk memprediksi intrusi air. Tujuan penelitian untuk menentukan peta zonasi intrusi berdasarkan kualitas airtanah, yaitu total dissolved solid (TDS) ,dan daya hantar listrik (DHL). Penelitian dilakukan di 33 kecamatan dengan 83 titik sampling pada bulan Februari 2017. Luas sawah di Kabupaten Indramayu sekitar 57,94%, dengan kontur berupa dataran rendah dengan daerah endapan di timur laut. Pasokan air permukaan Kabupaten Indramayu berasal dari DAS Cimanuk, Cipunegara, dan Cipanas. Pada musim kemarau air tanah Kabupaten Indramayu sudah dieksploitasi berlebihan untuk sumur bor sebagai irigasi. Akuifer bebas terletak 3 - 30 meter di bawah permukaan tanah, dengan tebal sekitar 15 - 20 meter, mengalir dari selatan ke utara. Topografi Kabupaten Indramayu berada pada ketinggian 0 - 100 meter di atas permukaan air laut dengan kemiringan rata-rata 0 - 2%. Hal inilah yang menyebabkan Kabupaten Indramayu tergenang air saat curah hujan tinggi. Nilai kualitas airtanah didapat bahwa bagian utara dan timur lebih besar dari selatan dikarenakan batas pantai terletak di bagian utara dan timur.Keywords: EC, Indramayu District, intrusion, TDS
PERENCANAAN TANGKI SEPTIK KOMUNAL DI DESA SUWARU, KECAMATAN PAGELARAN, KABUPATEN MALANG, JAWA TIMUR Setjo, Teguh Budiaji; Saptomo, Satyanto Krido; Wirasembada, Yanuar Chandra
Jurnal Teknik Sipil dan Lingkungan Vol. 1 No. 3: Desember 2016
Publisher : Departemen Teknik Sipil dan Lingkungan, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (812.388 KB) | DOI: 10.29244/jsil.1.3.159-173

Abstract

Environmental sanitation problems that occurred in Suwaru is septic tanks build too close to water sources such as wells and domestic waste disposal directly into the river. The purpose of this study is to determine the communal septic tank to achieve optimum and effective placement for the people in Suwaru, while also making the design communal septic tanks and leach fields communal septic tanks. The exact location of the study conducted in Suwaru, Pagelaran, Malang. The communal septic tank designed by four steps. These steps are estimating the population, calculating the dimensions of communal septic tanks, land mapping at the site plan and creating detailed engineering design (DED) of a communal septic tank. Septic tanks planned split into two service areas taking into account the difference in elevation of the service area. According to population projections, draining time (N) 5 years. Dimensions to accommodate the volume of waste that must be provided, with a height assumption of the septic tank is 4.5 m, obtained length is 10 m and width is 5 m to both septic tank.  
PENDUGAAN RELIABILITY WADUK NADRA KRENCENG PT. KRAKATAU TIRTA INDUSTRI Wirasembada, Yanuar Chandra; Saptomo, Satyanto Krido; Saputra, Muhamad Budi
Jurnal Teknik Sipil dan Lingkungan Vol. 1 No. 2: Agustus 2016
Publisher : Departemen Teknik Sipil dan Lingkungan, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (810.138 KB) | DOI: 10.29244/jsil.1.2.101-110

Abstract

The increasing of high population rate, plus there was a new steel industry named PT. Krakatau Posco in Cilegon has made higher demand of  clean and raw water. The Volume of Nadra Krenceng reservoir used by PT. Krakatau Tirta Industri is still doubted to fulfill water demand in Cilegon. The purpose of this research  to analyze how much the reservoir volume capacity that will always be available and makes the program with Visual Basic Application in Microsoft Excel. The reliability calculation of Nadra Krenceng reservoir was conducted using three methods; F.J Mock, NRECA dependable discharge, and simulation the result of both methods use Weibull Method. The simulation result of Weibull Method shows for F.J Mock dependable discharge with probability of 95%, 90%, 80% and 50% are 5,023,095 m3; 5,733,905 m3; 7,215,525 m3; and 11,600,385 m3 respectively. For NRECA Method simulation, the result with the same series probabilities are 3,831,718 m3; 4,531,326 m3; 5,930,542 m3; and 10,128,191 m3 respectively. The Probabilities used by PT. KTI to guarantee the water availability in Nadra Krenceng reservoir is 80%. To conclude, the available volume of Nadra Krenceng reservoir now 7,215,525 m3 for F.J Mock Method and 5,930,542 m3 for NRECA Method. Both of calculation of water availability of Nadra Krenceng reservoir could achieve good enough accuracy. The R2 values for F.J Mock Methods is 0.685 and 0.653 for NRECA method.
ANALYSIS OF RECHARGE POTENTION IN UPPER CISADANE WATERSHED Pranoto, Radius; Saptomo, Satyanto Krido; Waspodo, Roh Santoso Budi
Jurnal Teknik Sipil dan Lingkungan Vol. 1 No. 2: Agustus 2016
Publisher : Departemen Teknik Sipil dan Lingkungan, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (952.177 KB) | DOI: 10.29244/jsil.1.2.69-82

Abstract

ABSTRACT                Human disturbance such as land use changes, urbanization, and deforestation degrade Upper Cisadane Watershed. It also causes degradation of recharge area, decrease infiltration and increase runoff. The aims of this research were to (1) identify the criticality of recharge area; and (2) analyze the potential of water recharge in Upper Cisadane Watershed. The criticality of recharge area had been identified  refers to regulation of the Minister of Forestry, Republic of Indonesia Number: P.32/MENHUT-II/2009 by scoring and overlaying of slope, soil type, rainfall, and land use map. The amount of water recharge potential was predicted by the equation issued by IWACO and WASECO (1990).             The result showed that distribution of criticality of recharge area in Upper Cisadane Watershed in 2006, 2009, and 2013 were: (1) good: 24.7%, 24.7%, 23.6%; normal: 6.9%, 6.2%, 3.7%; (3) ranging critical: 17.9%, 17.8%, 19.4%, (4) rather critical: 25.0%, 24.9%, 30.7%; (5) critical: 23.9%, 24.5%, 22.0%; and (6) very critical:  1.9%, 2.0%, 0.7% respectively. The magnitude of the potential of water recharge on average in the recharge area was in good condition; 154.5 x 106 m3, normal; 33.9 x 106 m3, ranging critical; 94.6 x 106 m3, rather critical; 130.9 x 106 m3, critical; 98.2 x 106 m3, very critical; 6.2 x 106 m3. Upper Cisadane Watershed has a potential of annual water recharge was 511.7 x 106  to 569.2 x 106 m3/year or around 14% - 15.6%   of total rainfall, with an average change in the potential of water recharge from the simulation based on the condition of recharge area in 2006-2009 decreased -0.04%, in 2009-2013 decreased -3.2% and in 2006-2013 decreased -3.3%.Keywords: recharge area, infiltration, runoff, criticality.
ANALISIS KUALITAS AIR PADA JALUR DISTRIBUSI AIR BERSIH DI GEDUNG BARU FAKULTAS EKONOMI DAN MANAJEMEN INSTITUT PERTANIAN BOGOR Daeng Barang, Millah Hudiyah; Saptomo, Satyanto Krido
Jurnal Teknik Sipil dan Lingkungan Vol. 4 No. 1: April 2019
Publisher : Departemen Teknik Sipil dan Lingkungan, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (358.666 KB) | DOI: 10.29244/jsil.4.1.13-24

Abstract

One of the causes of the decreasing of water quality was the increasing of inappropriate human activities that caused water pollution. Cihideung River was being made as water resource in the campus area which the water have been used for a lot of activities in IPB Dramaga Campus. The purpose of this research were to analyze the clean water quality from the ground water tank (GWT) in Cihideung to the new buildings of the FEM, to compare the result with a national quality standard, to determine the criteria of clean water quality based on STORET method, and to analyze the influence of time and weather to the water quality. The parameters which had concentration below the standard were TDS, turbidity, temperature, iron, fluoride, chloride, manganese, and sulfate, and biological parameters like the total coliform/E.coli. The parameters which exceeded the standard were the value of color of 60 TCU in Cihideung GWT at rainy afternoon and pH of 6.38 in wing 1 sanitary at rainy morning. According to the US-EPA system, the water quality of distribution channels of FEM new building were classified into grade B, that meant light contaminated.Key words: distribution channels, quality standard, water pollution, water quality
PREDICTION OF GROUNDWATER STORAGE IN CISADANE WATERSHED Prasetya, Dimas Ardi; Prasetya, Dimas Ardi; Budi Waspodo, Roh Santoso; Saptomo, Satyanto Krido
Jurnal Teknik Sipil dan Lingkungan Vol. 1 No. 2: Agustus 2016
Publisher : Departemen Teknik Sipil dan Lingkungan, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (875.509 KB) | DOI: 10.29244/jsil.1.2.59-68

Abstract

Water is very important for human beings.Sources of fresh water that can be used are only 3% of the total water availability on earth, and 12% from that quantity are soureces of groundwater. Groundwater is one of the water resources that very important in sufficient human needs, such as domestic, agriculture or industry. Geoelectric is one of methods for groundwater investigation. The purposes of this research are to identify litholgy of soil layer, thickness of aquifer position on research location, determining hydraulic soil conductivity value and predict the groundwater reserve potential in Cisadane Watershed. This research was conducted in several steps, such as collected data and analysis data. The processed data was the secondary geoelectrical data with schlumberger method. Calculation of groundwater storage using geoelectric and Darcy?s law. Aquifer thickness layer obtained from the average content aquifer layer on research location, so it can represents the thickness of the aquifer. From the calculation result obtained groundwater reserve prediction amounted to 2.46 m3/second for unconfined aquifer and 8.64 m3/second for confined aquifer.