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GROUNDWATER IN THE DISTRICT OF WAJO IS STORED IN SIWA-POMPANUA BASIN COVERING AN AREA OF 93,900 HA AND DISCHARGE OF AROUND 379 MILLIONS M3/YR.  THE GROUNDWATER IS UTILIZED TO IRRIGATE RAIN-FED RICE FIELDS PRIVATELY BY FARMERS BY MEANS OF WELLS.  THE DISTANCE BETWEEN WELLS AND PUMPING RATE ARE DESIGNED WITHOUT CONSIDERING THE CHARACTERISTICS OF THE AQUIFER AND ADEQUATE IRRIGATION MANAGEMENT SO THAT DAMAGE IN ENVIRONMENT MIGHT OCCUR AND CONSEQUENTLY FARMING MIGHT NOT BE SUSTAINABLE.  A RESEARCH ., Suhardi; Pawitan, Hidayat; Setiawan, Budi Indra; Waspodo, Roh Santoso B.
Forum Pasca Sarjana Vol. 31 No. 3 (2008): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Abstract

Groundwater in the District of Wajo is stored in Siwa-Pompanua basin covering an area of 93,900 ha and discharge of around 379 millions m3/yr.  The groundwater is utilized to irrigate rain-fed rice fields privately by farmers by means of wells.  The distance between wells and pumping rate are designed without considering the characteristics of the aquifer and adequate irrigation management so that damage in environment might occur and consequently farming might not be sustainable.  A research was conducted with the objectives to study the aquifer characteristics and to develop environmentally friendly groundwater management.  Mathematical models were developed by combining equations of conservation of fluid mass (continuity equations) and Darcy?s law, whereas models of groundwater management were based on crop water requirement and aquifer characteristics.  Test of the model resulted in coefficient of determination equal to 0.848 for the prediction of the drawdown groundwater head.  The result of the model optimization indicated the optimum discharge of each of the wells was different.  One of the wells had a the biggest discharge of 1,268.33 m3/day irrigating 27.58 ha and one other  of the wells had a the smallest discharge of 279.54 m3/day irrigating 6.08 ha of paddy fields based on the irrigation water requirement of 45.99 m3/ha.day.  The reasonable minimum area (ha) determined with equation of power function in x, where x are irrigated hours per season.  For one of planting season/yr, the coefficients of the power (?) equal to 0.0123 and the power functions (?) equal to 0.7247, while for two of planting season/yr with ? equal to 0.0047 and ? equal to 0.8413.   Key words: sustainable groundwater utilization, paddy field irrigation, groundwater management model
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.
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.
KONSEP ECOHOUSE PADA RUMAH BADUY DALAM Widyarti, Meiske; Setiawan, Budi Indra; Arifin, Hadi Susilo; Yuwono, Arief Sabdo
Jurnal Keteknikan Pertanian Vol. 25 No. 2 (2011): Jurnal Keteknikan Pertanian
Publisher : PERTETA

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Abstract

Abstract Environment quality is worsening every year; building?s sector contributes 66 % of fossil fuels   pollution sources. Ways in building constructions needs to be changed in more environmental friendly manner. Today, in spite of new technological advances in techniques and materials, buildings are continuously being built but lack of climatic consideration. Indigenous people, such as the Inner Baduy community, from longstanding experience have developed systems as their local wisdoms adapting to its environment and buildings in a sustainable manner. The aim of this study is to emphasize the importance of traditional knowledge in terms of providing environmental friendly buildings and the existence of documentation as a knowledge base of an Indonesian traditional settlement in a hot humid climate?s mode. The study results are reconstructions on, building design will be presented in technical drawings and drawn with Sketch up computer program. Keywords: Baduy, design, ecohouse, local wisdom Abstrak Sektor bangunan menyumbang 66% dari sumber polusi bahan bakar fosil yang akan berdampak pada memburuknya kualitas lingkungan. Teknik konstruksi bangunan perlu diubah dengan cara yang lebih ramah lingkungan. Meskipun kemajuan dalam teknologi pembangunan berkembang pesat, dan  bangunan yang terus menerus dibangun  akan tetapi dalam penggunaan teknik dan material bangunan tidak mempertimbangkan kerusakan iklim yang ditimbulkan. Masyarakat adat, seperti masyarakat Baduy Dalam telah berpengalaman sejak lama dalam konservasi lingkungan yang dilaksanakan sebagai kearifan lokal mereka termasuk dalam pembangunan konstruksi rumah. Tujuan dari penelitian ini adalah 1) untuk mengevaluasi dan mendapatkan  pengetahuan dalam bangunan tradisional dan 2) Mendokumentasikan konsep bangunan tradisional Indonesia sebagai dasar dalam pembangunan pada  wilayah beriklim panas lembab. Hasil penelitian ini bangunan di Baduy Dalam merupakan bangunan yang berkelanjutan. Bangunan ini direkonstruksi dan disajikan dalam gambar teknik yang digambar dengan program komputer Sketchup 2008. Kata Kunci: Baduy Dalam, konstruksi eco-house, kearifan lokal Diterima: 21 April 2011; Disetujui: 16 Agustus 2011 
RECONSTRUCTION OF THE INNER BADUY’S ECOHOUSE STRUCTURE IN BANTEN PROVINCE Widyarti, Meiske; Setiawan, Budi Indra; Arifin, Hadi Susilo; Yuwono, Arief Sabdo
Forum Pasca Sarjana Vol. 35 No. 1 (2012): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Abstract

Environment quality has been worsening year by year; and building?s sector contributes 66% of fossil fuels pollution?s sources. The technique in building constructions needs to changing in order to increase environmental friendly manner. Indigenous people, such as the Inner Baduy community, from longstanding experience have developed systems as their local wisdoms adapting to its environment and houses in a sustainable manner. The objective of this study is to emphasize the importance of traditional knowledge in terms of providing low input energy buildings and settlement. A reconstruction of the Inner Baduy house has been drawn as a documentation of an Indonesian traditional house building in a tropical humid climate. The reconstruction is presented in a form of a technical drawings such as plan, view and section  drawing by using SkecthUp computer program. Baduy local wisdom of community is significant  in houseing structure development process. Indications by all the structure materials is taken from local sources such as rumbia roof and bamboo?s wall are taken from leuweung lembur and bantaran sungai. Development system?s local wisdom also very economic and efficient using pre-fabrication system. Key  words:  ecological design, environmental friendly, traditional building, sustainable construction
ESTIMASI EVAPOTRANSPIRASI POTENSIAL MENGGUNAKAN JARINGAN SYARAF TIRUAN Suprayogi, Slamet; Setiawan, Budi Indra; Suroso, Suroso Suroso
Majalah Geografi Indonesia Vol 18, No 1 (2004): Maret 2004
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (342.549 KB) | DOI: 10.22146/mgi.13265

Abstract

ABSTRAK Berbagai model evapotranspirasi potensial (ETp) telah dikembangkan, mulai dart model-model yang sederhana sampai dengan model-model yang kompleks membutuhkan konversi-konversi dan perhitungan rumit. Model ETp Penman termasuk model yang kompleks membutuhkan parameter-parameter iklim yang cukup banyalcyaitu: suhu udara, kelembaban relatif(relative humidity), kecepatan angin, tekanan uap jenuh (saturation vapor pressure), dan radiasi netto. Proses perhitungannya membutuhkan waktu relatif lama, karena harus melakukan konversi-konversi. Perhitungan ETp dapat dilalcukan secara efisien yalan proses perhitungan cukup singkat dan hasilnya secara basil perhitungan model Penman yaitu dengan model Jaringan SyarafTiruan (Artificial Neural Network), model tersebut merupakan penjabaran fungsi otak manusia (human brain) dalam bentukfungsi matematik yang menjalankan proses perhitungan secara paralel.Tujuan penelitian ini adalah mengestimasi ETp menggunakan model Jaringan Syaraf Tiruan (JST) dengan penjalaran balik (backpropagation). Data yang digunakan adalah data parameter iklim stasiun Serang tahun 1999 sid tahun 2001. Parameter iklim yang digunakan analisis adalah suhu udara, kecepatan angin, kelembaban relatif (RH), dan lama penyinaran matahari. Proses pembelajaran model Jaringan syaraf tiruan penjalaran balik menggunakan input parameter iklim dan output ETp basil perhitungan model Penman. Data training dan test adalah ETp model Penman, parameter iklim tahun 1999, dan ETp, parameter iklim tahun 2000. Verifikasi digunakan ETp, parameter iklim tahun 2001, dengan indikator kesalahn Root Mean Squared Enos (RMSE) digunakan pula koefisien determinasi (R2).Hasil training dan test data menggunakan model jaringan syaraf tiruan penjalaran balik (backpropagation) menunjukkan bahwa data tahun 1999 dan 2000 merupakan data yang representatif dengan.nilai RMSE adalah 0,00056 dan R2 adalah 0,98, sehingga data tersebut dapat mewaldli data parameter iklim stasiun Serang. Verifilcasi dilakukan dengan cara membandingkan ETp harian tahun 2001 basil perhitungan model jaringan syaraf tiruan dengan ETp harian tahun 2001 basil perhitungan model Penman. Nilai RMSE ETp harian tahun 2001 model Jaringan syaraf tiruan dengan model Penman adalah 0,3262, sedangkan koefisien determinasi (R2) adalah 0,88. Nilai tersebut menunjukkan ETp model jaringan syaraf tiruan penjalaran balik (backpropagation) mempunyai nilai yang secara dengan ETp model Penman. Dengan demikian nilaipembobot (weight) basil pembelajaran model JST dapat digunakan untuk mengestimasi ETp stasiun Serang pada tahun-tahun berilannya maupun tahun-tahun yang lalu.
KAJIAN SEDIMEN MELAYANG PADA SUB DAS SEI KALEMBAH (DAS PADANG), STUDI KASUS : PERKEBUNAN KELAPA SAWIT PTPN 4 KEBUN PABATU Susanto, Edi; Setiawan, Budi Indra; Suharnoto, Yuli; Liyantono, Liyantono
Jurnal Keteknikan Pertanian Vol. 5 No. 2 (2017): JURNAL KETEKNIKAN PERTANIAN
Publisher : PERTETA

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Abstract

AbstractThe purpose of this study was determined the amount of suspended sediment concentration dan sediment rating curve. Sediment rating curve are use to show the relationship between the discharge of the river and sediment discharge, a value sediment discharge can be used to predict the magnitude of the sedimentation process. Assesment of the suspended sediment have been made to overcome theproblems associated with the movement of contaminants, changes in water quality, to predict the lifetime of a dam on the river, and also to determine the rate of erosion due to changes in land use. Replanting at oil palm plantations, especially during land clearing that part of the land to be bare land. This condition causes the surface flow of replanted areas become rapidly concentrated into a ditch and into the river carrying sediment. The research results were obtained that the value of sediment discharge at the study site including the criteria for very high (greater than 20 tons/ha/yr) and already exceeds the limit sediment load criteria issued by the Ministry of Forestry. AbstrakTujuan penelitian ini adalah untuk mengetahui besarnya konsentrasi sedimen melayang (suspended sediment) dan kurva lengkung sedimen (sediment rating curve). Kurva lengkung sedimen merupakan kurva yang menunjukkan hubungan antara debit sungai dengan nilai debit sedimen sehingga dapat digunakanuntuk memprediksi besarnya proses sedimentasi. Kajian terhadap sedimen melayang (suspended sediment) telah dilakukan untuk mengatasi masalah yang berhubungan dengan proses pergerakan kontaminan (bahan penyebab polusi), perubahan kualitas air, memprediksi masa pakai dari sebuah bendungan disungai, dan juga untuk mengetahui laju erosi akibat perubahan tataguna lahan. Kegiatan peremajaan (replanting) pada perkebunan kelapa sawit, terutama pada saat pembersihan lahan (land clearing) maka sebagian lahan menjadi terbuka. Kondisi ini yang menyebabkan aliran permukaan dari areal peremajaanmenjadi cepat terkonsentrasi ke parit dan menuju sungai dengan membawa sedimen. Dari hasil penelitian yang dilakukan diperoleh bahwa nilai debit sedimen pada lokasi penelitian termasuk kriteria sangat tinggi (lebih besar dari 20 ton/ha/thn) dan sudah melebihi batas kriteria muatan sedimen yang dikeluarkan oleh Kementerian Kehutanan.
PENDUGAAN KOMPONEN KESEIMBANGAN AIR DI LAHAN SAWAH DENGAN LINEAR PROGRAMMING Arif, Chusnul; Setiawan, Budi Indra
Jurnal Irigasi Vol 14, No 2 (2019): Jurnal Irigasi
Publisher : Balai Penelitian dan Pengembangan Irigasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31028/ji.v14.i2.79-88

Abstract

Dalam pengelolaan air di lahan sawah, analisis keseimbangan air biasanya digunakan untuk menganalisis efektifitas pemberian air irigasi. Akan tetapi, seringkali dengan keterbatasan peralatan, waktu, dan biaya tidak semua komponen keseimbangan air dapat diukur. Makalah ini menyajikan metode Linear Programming (LP) untuk menduga komponen keseimbangan air di lahan sawah yang tidak terukur. Adapun tujuan studi ini adalah mengembangkan model LP untuk menduga komponen keseimbangan air di lahan sawah seperti irigasi, limpasan dan perkolasi dengan menggunakan data perubahan kelembaban tanah khususnya untuk irigasi tidak tergenang, mengevaluasi performansi model dengan membandingkan data hasil pendugaan dan pengukuran. Studi dilakukan berdasarkan hasil experiment dua musim tanam budidaya padi irigasi tidak tergenang dengan System of Rice Intensification (SRI) di NOSC, Sukabumi Jawa Barat dari tanggal 20 Agustus ? 15 Desember 2011 (musim pertama) dan 22 Maret - 5 Juli 2012 (musim kedua). Model LP yang dikembangkan memiliki fungsi tujuan untuk meminimalisir total selisih kelembaban tanah hasil pengukuran dan pendugaan model. Selain itu, model LP juga memiliki fungsi batas dan kondisi awal yang ditentukan berdasarkan kondisi aktual di lapang. Hasilnya menunjukkan bahwa model LP dapat menduga komponen keseimbangan air dengan akurat dengan indikator nilai R2 > 0.85 (p value < 0.01) dan persen error dibawah 8%. Berdasarkan hasil pendugaan model, komponen irigasi berkontribusi hanya 34-38% dari total air masuk, sedangkan komponen evapotranspirasi tanaman dan perkolasi berkontribusi sebesar 40-44% dan 11-15% dari total air yang keluar. Hujan dan limpasan merupakan komponen yang paling besar berkontribusi pada air masuk dan keluar. Dengan metode ini, maka parameter yang membutuhkan data yang tidak terukur dapat ditentukan seperti efisiensi penggunaan air dan produktivitas air yang membutuhkan data irigasi dalam penentuannya.
PREDICTION OF GROUNDWATER STORAGE IN GABUS WETAN SUBDISTRICT, INDRAMAYU REGENCY, WEST JAVA PROVINCE, INDONESIA Saputra, Septian Fauzi Dwi; Waspodo, Roh Santoso Budi; Setiawan, Budi Indra
Jurnal Teknik Sipil dan Lingkungan Vol. 1 No. 3 (2016): Edisi 1 (3) Desember 2016
Publisher : Departemen Teknik Sipil dan Lingkungan, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3847.797 KB) | DOI: 10.29244/jsil.1.3.147-158

Abstract

Gabus Wetan Subdistrict, Indramayu Regency in West Java Province known as one of rice production center in Indonesia has common problem of surface irrigation water that is unavailable in dry season. It necessary to find alternative water source from groundwater to increase intensity as well as productivity. The aim of this study were to determine geoelectrical-hydrogeological profiles in form of distribution characteristics of the aquifer indicated by the resistivity of rocks and to predict the groundwater reserve potential in Gabus Wetan, Indramayu Regency. Resulted information can then be used to exploit groundwater for alternative supply of irrigation water. The result of this study shown that the rock resistivity in the area ranging between 1-30 ?m. The rock aquifers consist of sandy clay, clayey sand, and sand. The shalllow groundwater (unconfined aquifer) are in the range of 3-40 meters below the soil surface having tickness of aquifer in the range of 7-20 meters. The deep groundwater (confined aquifer) can be estimated at the depth of more than 60 meters below the soil surface having tickness more than 40 meters. The hydraulic conductivity is estimated 20 m/day for unconfined aquifer and confined aquifer. The predicted groundwater storage of unconfined aquifer was about 31,687.2 m3/day or 0.37 m3/sec and confined aquifer 99,382.6 m3/day or 1.15 m3/sec.Keywords: aquifer,  groundwater, hydrogeology, hydraulic conductivity, resistivity
SALINIZATION PROCESS ON SAND MEMBRANE AS A SIMULATION OF SEA WATER INTRUTION AND TIDAL FLOOD EFFECT Kumala, Akfia Rizka; Setiawan, Budi Indra; Saptomo, Satyanto K; Yanto, Rudi
Jurnal Teknik Sipil dan Lingkungan Vol. 1 No. 1 (2016): Edisi 1 (1) April 2016
Publisher : Departemen Teknik Sipil dan Lingkungan, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (510.567 KB) | DOI: 10.29244/jsil.1.1.11-19

Abstract

 Salinization process through a membrane of sand is  presented in this paper. Two treatments were performed here. Treatment 1, saline water flowed continuously from below the membrane with a stable unsaturated water content depicted as a simulation of sea water intrusion. Treatment 2, the membrane was inundated with saline water depicted as a simulation of flooding. Two kinds of membrane used which were black and white sand. Black sand had saturated water content (?s) 0.35 cm3/cm3, and the white sand 0.52 cm3/cm3. The highest to the lowest evaporation rate were flooded black sand, unflooded black sand, flooded white sand, and unflooded white sand membranes. Flooded and unflooded black sand membrane had higher temperature than flooded and unflooded white sand membrane. Most salt crystals were produced by the not flooded membrane amounted to 14.7 gram and 15 gram.Keywords : salinization, sand membrane, saline water, evaporation