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All Journal Indonesian Journal of Geography SOCA: Jurnal Sosial Ekonomi Pertanian Jurnal Keteknikan Pertanian agriTECH Jurnal Ilmiah Rekayasa Pertanian dan Biosistem SAINS TANAH - Journal of Soil Science and Agroclimatology Jurnal Irigasi Jurnal Teknik Sipil

SIGIT SUPADMO ARIF

Department Of Agricultural And Biosystems Engineering, Faculty Of Agricultural Technology, Universitas Gadjah Mada

Author-ID : 393169

Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Transportation

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Penentuan Laju Degradasi Prasarana Irigasi Menggunakan Metode Statistik Judy Kurniawan; Putu Sudira; Sigit Supadmo Arif
agriTECH Vol 28, No 3 (2008)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Degradation process of irrigation infrastructures is one of the most important things and determines the last result ofAsset Management Planning (AMP). Degradation process will determine irrigation infrastructure’s lifetime, hence, it will influence the whole process of AMP, and finally influence the management of irrigation infrastructures. The objec- tive of this research aims at developing a model of the degradation rate of irrigation infrastructures, as one input for AMP, to support decision making in irrigation infrastructure management. This research was conducted at Sidandang, Pengasih, Jering and Mejing irrigation schemes located at Magelang, Kulonprogo, Sleman, and Bantul Districts, respectively. Statistical model was used to analysis the rate of degradation of irrigation infrastructures. The model requires the relation between time for degradation and the number of degradations. The data used for analysis was secondary data of asset condition in several years. The result shows that linear model that has been regularly used before is not valid to predict the rate of degradation of irrigation infrastructures based on irrigation facet age. The exponential model was developed in order to find out the more suitable procedure to predict the rate of degradation process based on irrigation facet age, and effective for all types of facet at all types of asset. The rate of degradation process of irrigation asset condition is highly influenced by the rock composition factor and soil physical characteris- tics of asset construction.ABSTRAKProses degradasi prasarana irigasi merupakan salah satu bagian penting dan sangat menentukan hasil akhir perenca-naan manajemen aset (PMA). Hal ini disebabkan karena proses degradasi menentukan umur prasarana irigasi, yang akan mempengaruhi seluruh proses PMA, dan akhirnya juga akan mempengaruhi pengelolaan prasarana irigasi. Penelitian ini bertujuan untuk mengembangkan dan menyusun suatu model laju degradasi prasarana irigasi sebagai salah satu masukan kegiatan PMA untuk mendukung pengambilan keputusan dalam pengelolaan prasarana irigasi. Penelitian dilaksanakan di Daerah Irigasi Sidandang, Pengasih, Jering, dan Mejing, masingmasing terletak di Kabu- paten Magelang, Kulonprogo, Sleman dan Bantul. Metode yang digunakan untuk menganalisis laju degradasi prasa- rana irigasi adalah pemodelan statistik dengan menghitung hubungan variabel waktu yang dibutuhkan untuk setiap proses degradasi dan jumlah kerusakan. Data yang dipergunakan untuk analisis adalah data sekunder kondisi aset irigasi dalam waktu beberapa tahun. Hasil penelitian menunjukkan bahwa model linier yang biasa digunakan selama ini tidak handal untuk memprediksi laju degradasi sarana irigasi berdasarkan umur faset irigasi. Model eksponensial yang dikembangkan lebih handal untuk memprediksi laju degradasi prasarana irigasi berdasarkan umur faset irigasi, dan berlaku untuk semua tipe faset pada semua tipe aset. Proses degradasi kondisi aset irigasi sangat dipengaruhi oleh faktor komposisi batuan dan sifat fisik tanah penyusun aset.

Analisis Spektral dalam Penentuan Periodisitas Siklus Curah Hujan di Wilayah Selatan Jatiluhur, Kabupaten Subang, Jawa Barat Dyah Susilokarti; Sigit Supadmo Arif; Sahid Susanto; Lilik Sutiarso
agriTECH Vol 36, No 1 (2016)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Rainfall data was studied to know how rainfall in the region has a span of time to form a repetitive pattern. The cycle is a change or a wave up and down within a period and repeated at other periods. The cycle has a frequency that can be completed in one period of time. Fourier transform is an algorithm to convert the time domain X to the domain or the frequency spectrum Y, by breaking the signal into a sinusoidal component. This study used the Fast Fourier Transform (FFT) to find the nature of the trend recurrence of rainfall in the southern region of Jatiluhur Subang. Simulation model was done using monthly rainfall data 1975 - 2012. The results showed a trend of rainfall in the study area was repeated every 12 months (1 cycle). Rainfall prediction was done by using a 5-year rainfall data and used the data observation of the next 5 years as a comparison result predicted to see the performance. Performance prediction was resulted using the Mean Square Error (MSE) used to obtain the difference between the standard derivation calculation of observed data and data modeling. The results of the analysis at the time of validation of the model was MSE 14.92 with a 95% confidence level. FFT used to calculate the value of the error (the difference between the values calculated by the ANN model and observed data) resulted in the change cycle of rainfall occurs over a period of months or approximately 71.68 months or 5-6 years.ABSTRAKData curah hujan dipelajari salah satunya untuk mengetahui bagaimana curah hujan di suatu wilayah mempunyai rentang waktu untuk membentuk suatu pola berulang. Siklus merupakan suatu perubahan atau gelombang naik dan turun dalam suatu periode serta berulang pada periode lain. Siklus mempunyai frekuensi yang dapat diselesaikan dalam 1 periode waktu. Transformasi Fourier merupakan algoritma untuk mengubah domain waktu X menjadi domain atau spectrum frekuensi Y, dengan cara menguraikan sinyal menjadi komponen sinusoidal. Penelitian ini menggunakan metode Fast Fourier Trans!orm (FFT) untuk mencari sifat berulangnya trend curah hujan di wilayah selatan Jatiluhur Kabupaten Subang. Simulasi model menggunakan data curah hujan bulanan tahun 1975 - 2012. Hasilnya menunjukkan trend curah hujan di lokasi penelitian berulang setiap 12 bulan sekali (1 siklus). Prediksi curah hujan dilakukan dengan menggunakan data curah hujan 5 tahun dan menggunakan observasi data 5 tahun berikutnya sebagai pembanding hasil prediksi untuk melihat performa yang dihasilkan. Performa hasil prediksi menggunakan Mean Square Error (MSE) sebagai standar perhitungan derivasi perbedaaan antara data real dan data pemodelan. Hasil analisis pada saat validasi model didapatkan MSE 14,92 dengan tingkat kepercayaan 95%. Dengan menggunakan analisis FFT untuk menghitung nilai error (perbedaan antara nilai perhitungan model ANN dengan data sebenarnya), diperoleh perubahan siklus curah hujan terjadi dalam kurun waktu 71,68 bulan atau sekitar 5-6 tahun.

Identifikasi Perubahan Iklim Berdasarkan Data Curah Hujan di Wilayah Selatan Jatiluhur Kabupaten Subang, Jawa Barat Dyah Susilokarti; Sigit Supadmo Arif; Sahid Susanto; Lilik Sutiarso
agriTECH Vol 35, No 1 (2015)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Indonesian region is strongly influenced by the monsoon climatic conditions have obvious difference between wet season and dry season. Climate variability and extreme climate phenomenon that often happens lately caused climate change. Climate change is characterized by changes in rainfall patterns and its causes shifting early in the season that make it difficult to plan cultivation. It is therefore necessary to study the behavior of the climate through rainfall time series analysis. Statistical tests performed using the F test and t test. This study aims to identify climate change through pattern trends, distribution and similarity of rainfall data at different timescales, using rainfall data rainy season (October to March) and the dry season (April to September) year period from 1975 to 2012. Data obtained from 6 (six) graduated rainfall stations around the study site those are Kalijati, Curugagung, Cinangling, Dangdeur, Subang and Pegaden. Data are grouped in 10-year period with a 4-year timing differences in accordance with the rules of the moving average. The period 1975 -1984 was indicated as an initial period as a basis to look for changes in rainfall patterns that occur. F test shows there has been a change in the distribution of rainfall in every period than normal period. T test showed there has been a change in the pattern of rainfall in the dry season period from 1987 to 1996. While the rainy season is starting to look at the period from 1995 to 2004. Rainy season and the dry season period (1995-2004) shows a similar pattern with the normal period (1975 -1984) so that it is possible in a certain period of climate change on the location of the cycle is approaching normal conditions.ABSTRAKWilayah Indonesia sangat dipengaruhi oleh kondisi iklim monsun yang mempunyai perbedaan yang jelas antara musim basah dan musim kering.Variabilitas iklim dan adanya fenomena iklim ekstrim yang sering terjadi akhir akhir ini menyebabkan terjadinya perubahan iklim. Perubahan iklim ditandai adanya perubahan pola curah hujan yang menyebabkan terjadinya pergeseran awal musim tanam sehingga sulit membuat perencanaan budidaya tanaman. Oleh karena itu perlu dilakukan kajian prilaku iklim melalui analisis deret waktu curah hujan.Uji statistik dilakukan dengan menggunakan uji F dan uji t. Penelitian ini bertujuan untuk mengidentifikasi terjadinya perubahan iklim melalui pola kecenderungan, distribusi dan kesamaan data curah hujan pada rentang waktu yang berbeda, menggunakan data curah hujan musim hujan (Oktober – Maret) dan musim kemarau (April – September) periode tahun 1975 – 2012. Data diperoleh dari 6 stasiun penakar curah hujan di sekitar lokasi penelitian yaitu stasiun Kalijati, Curug agung, Cinangling, Dangdeur, Subang dan Pegaden. Data dikelompokkan dalam periode 10 tahunan dengan beda waktu 4 tahun sesuai dengan aturanmovingaverage. Periode tahun 1975 -1984 menjadi periode awal sebagai dasar untuk melihat perubahan pola curah hujan yang terjadi. Uji F menunjukkan telah terjadi perubahan distribusi curah hujan disetiap periode dibanding periode normalnya. Uji t menunjukkan telah terjadi perubahan pola curah hujan musim kemarau sejak periode tahun 1987 – 1996. Sedangkan musim hujan mulai terlihat pada periode tahun 1995 – 2004. Musim hujan dan musim kemarau periode (1995-2004) menunjukkan pola yang sama dengan periode normal (1975-1984) sehingga dimungkinkan pada periode tertentu siklus perubahan iklim pada lokasi ini mendekati kondisi normal.

Model Perencanaan Pembangunan Pedesaan Berbasis pada Sektor Pertanian (Studi Kasus Kecamatan Moyudan Kabupaten Sleman) Lilik Sutiarso; Sigit Supadmo Arif; Murtiningrum Murtiningrum
agriTECH Vol 25, No 1 (2005)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Sleman, as an area with rapid economic growth, againts the challenge of development in relation with population expansion, local autonomy and good governance. In one hand, there is lack of synergy among development stakeholders, on the other hand. information is ineffectively used during the decision making process. This paper aimed to develop a model of rural development plan based on agricultural sector using two computer softwares,(i) Geographical Information System (GIS) as spasial information system and (ii) Powersim to program the dynamic system behaviour. The model provides information on existing condition and consists of five components namely geography, development function, infrastructure, institution, and data catalog. The model was developed through formulating causal diagrams of development sectors and set it in a dynamic programming. The model was then validated in Moyudan, Sleman for the case of agriculture development, which is showed that the model was valid.

Assessment of Irrigation System Performance and Its Associated Impacts on Poverty Murtiningrum Murtiningrum; Sigit Supadmo Arif
agriTECH Vol 25, No 1 (2005)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

It is indicated that the level of performance of an irrigation systefrz affects the benefit received by farmers. Low level of performance leads on the low farmers' income, which furthermore affects farmers' welfare. On the opposite, farmers with low level of welfare have limited capability to manage their irrigation system so the level of performance of the system declines. This created a vicious circle of low performance and poverty. This paper aims to assess irrigation system peformance, relate the performance with poverty in the system, and examine possibilites of poverty alleviation through improvement of irrigation system performance. Irrigation performance assessment comprises of characterization of irrigation system and performance assessment by using indicators. The study has been conducted in four irrigated systems in Java, namely Klambu Kiri, Glapan, Kalibawang, and Krogowanan. Lesson learnt were drawn from cases of the selected systems to find out factors affecting irrigation performance and how irrigation system performance affects farmers' welfare. Possible efforts to improve irrigation system performance to alleviate poverty are crop diversification, Irrigation Management Transfer, empowerment of Water Users' Association (WUA), locally specific farming, and off farm job opportunity. To implement those efforts there are some constraints to deal with, such as limited technical capability of farmers, diversity of social and culture, and limited available data and information.

Conceptual Approach On Development of Tidal Farming From Water Management Aspect, A Case Study at Kalimantan, Indonesia Sahid Susanto; Sigit Supadmo Arif
agriTECH Vol 7, No 1 (1987)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

A lot of tidal irrigation land development projects were carried out in several locations of Kalimantan for new settlement and food production. A continuous research has been conducted to develop tidal agricultural land since 1971. Based on the research, a new concept for redesigning and reconstructing of tertiary demonstration block (TDB) should be develop. A conceptual approach on development of tidal farming from water management aspect has been proposed. The concept is presented in a model named Micro Water Management Model (MWMM): The basic concept of MWMM is improvement of micro water management and then be followed by improvement of all aspects.

Drainage Problems In the Paddy Fields Sigit Supadmo Arif
agriTECH Vol 9, No 2 (1989)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Modifikasi Model Hidrologi Tangki Sugawara Untuk Analisis Regim Air di Lahan Sawah Beririgasi Susilan Hidayat; Sahid Susanto; Sigit Supadmo Arif
agriTECH Vol 13, No 3 (1993)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Model hidrologi tangki Sugawara telah dimodifikasi dan diterapkan di lahan sawah beririgasi, dengan kajian kasus di petak tersier BP 1 Ka di DI Pijenan. Hasil kaliberasi model menunjukkan bahwa model dapat menampilkan unjuk kerja yang cukup memadai. Model selanjutnya digunakan untuk analisis regim air di petak irigasi tersier tersebut, dengan membagi regim air menjadi lima komponen, yaitu: (a) pemberian air irigasi, I; (b) evapotranspirasi aktual, Eta; (c) perkolasi, P; (d) air yang keluar dari petak, Qo; dan (e) kehilangan air tak terkontrol, L. Rata-rata jumlah air untuk masing-masing komponen diperoleh: I = 9,06 mm/hari (1,05 It/dt/ha); Eta = 3,69 mm/hari; P = 1,25 mm/hari; Qo = 1,63 mm/hari (0,19 It/dt/ha); dan L = 6,21 mm/hari (0,72 It/dI/ha). Nilai efisiensi pemberian air irigasi di petak tersebut selama penelitian berkisar antara 21% hingga 75%, dengan rata-rata sebesar 42%. Sedangkan untuk pemberian air irigasi yang optimal diperoleh angka 1,3 It/dt/ha.

Kinerja Alat Pencurah Sederhana Pada Sistem Irigasi Curah (Sprinkler Irrigation System) Saiful Rochdyanto; Sigit Supadmo Arif; Isti Susilawati
agriTECH Vol 17, No 2 (1997)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

The modification of fabricated sprinkler which is available in the market was done in order to solve several problems, such as : the performance is unsatisfied, the prize is relatively high, the construction is complicated, and the operation and maintenance is not too easy. The performance testing was carried out to six model of modification sprinklers, they were : Sl, S2, S3, S4, S5, and S6, and then compared with fabricated sprinkler (SP). Sprinklers were tested with several parameters, such as : water discharge, throw distance, water distribution pattern, water rate, and particle water diameter. Result of experiment showed that S5 gives the best performance. This model has upper arm length = 5.0 cm, lower arm length = 3.8 cm, nozzle angle in upper arm = 65Â°, nozzle angle in lower arm = 40°, the number of nozzle in each lower arm and top of arm is one. Comparing with fabricated sprinkler (SP), the prize of S5 model is relatively cheap. It is Rp. 5,575.00 for S5 and Rp. 17,500.00 for SP. Due to the construction is relatively simple and the product material is very easy to find in local market, so the model S5 can be introduced and developed to farmers in order to increase their agricultural production.

Penentuan Transmisivitas dan Porositas Efektif Untuk Mengkaji Proses Gerakan Airtanah Pada Lahan Heterogen Mahmud Achmad; Sigit Supadmo Arif
agriTECH Vol 17, No 4 (1997)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

The main purpose of this research is to determine properties of non-homogeneous ill-drained area which are reflected by transmissivity and effective porosity. The flow of water was analyzed using Darcy law and Boussinesq equations which were developed based on analogy theory of heat conduction to 2-Dimension (pseudo 3-D) of transient water flow. Based on the formula, transmissivity and effective porosity have been determined through mathematical model. The model needs daily deep water table as the main data. The model was tested in PG Jatitujuh Cirebon. The transmissivity and effective porosity information were very useful to solving drainage problems in the ill-drained area. Result of iteration method indicated that the land have 11 and S are 0,070 - 0,698 rnlm and 0,10 - 91,0 m2/day respectively. A R-square test was used to compare deep water table between observation data and output model each of bore hole, and was found average R-square is 0,8519 and standard of error is 0,0981.

Co-Authors Abi Prabowo Abi Prabowo Abi Prabowo Agung Prabowo Anditya Sridamar Pratyasta Anjar Suprapto Ansita Gupitakingkin Pradipta Ari Prabowo Bambang Purwantana Bayu Dwi Apri Nugroho Benito Heru Purwanto DJITO - Dyah Susilokarti Dyah Susilokarti Dyah Susilokarti Erni Romansyah Fathul Imron I WAYAN WINDIA Ika Purnamasari Irawadi Irawadi Isti Susilawati Judy Kurniawan Judy Kurniawan Lilik Sutiarso Lilik Sutiarso Lilik Sutiarso Lilik Sutiarso Lilik Sutiarso Lilik Sutiarso Maftukhah, Rizki Mahmud Achmad Moch Maksum Mochammad Maksum Muchamad Wahyu Trinugroho Murtiningrum Murtiningrum Nugroho Tri Waskitho Nuzul Hijri Darlan NYOMAN SUTAWAN P. Tamtomo PURYANTO - Putu Sudira Putu Sudira Putu Sudira Riki Andika Rochmad Basuki Sahid Susanto Sahid Susanto Sahid Susanto Sahid Susanto Saiful Rochdyanto Sri Redjeki Suci Ristiyana SUPRODJO PUSPOSUTARDJO Susilan Hidayat Tri Wahyu Saputra

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