ENGINEERING JOURNAL: PERBANDINGAN KINERJA MODEL BERBASIS SISTIM KECERDASAN BUATAN UNTUK PERAMALAN ALIRAN INFLOW WADUK SELOREJO SETAHUN KEDEPAN

Jurnal REKAYASA Volume 8 Nomor 1 Artikel 1

SULIANTO
(Staf Pengajar Jurusan Teknik Sipil, Fakultas Teknik, Universitas Muhammadiyah Malang. e-mail: sulianto1967@gmail.com)

ABSTRACT: River flow forecasting a year ahead is an important step in planning the operation pattern of hydraulic building which serves primarily for the supply of water. Conventional forecasting methods are widely applied today proved less satisfactory results. Application of the flow forecasting model based on artificial intelligence system developed in this study may provide better results in presenting the relationship between historical data and prediction data stream reservoir inflow Selorejo year ahead. Model-based artificial intelligence system that delivers the best performance is the system of equations developed from historical data series of monthly shifted, meaning that the flow is going to happen in the next month (t +1) will be strongly influenced by the value of the flow in the current month (t), 1 previous month (t-1), 2 months earlier (t-2) to 12 months before (t-12). Of the three types of model-based forecasting model developed by Artificial Neural Networks can show the best performance compared to other two types of models. Testing results using the ANN-based model testing data on reservoir inflow data obtained Selorejo Year 2007 performance indicator value = 0.3729 million m3/periode RMSE, MAE = 1.9124 million m3/periode, RAE = 21.79% and 6.84% RRSE. .

Keywords: flow, artificial, intelligence, forecasting, system


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ENGINEERING JOURNAL: APLIKASI SISTEM INFORMASI GEOGRAFIS UNTUK MENDETEKSI POTENSI BENCANA TANAH LONGSOR dan BANJIR BANDANG

(Studi Kasus: Daerah Aliran Sungai Podi Kabupaten Tojo Una-una Propinsi Sulawesi Tengah)

Jurnal REKAYASA Volume 7 Nomor 2 Artikel 13

Eri Andrian Yudianto
(Staf Pengajar Jurusan Teknik Sipil Institut Teknologi Nasional Malang dan Staf Ahli Bidang Teknik Sipil Pada P.T. Waindo Specterra Jakarta)

ABSTRACT: There are many landslide disaster potential area in Eastern Central Sulawesi.This landslides is potentialy triggering flashflood. I the middle 2007, a massive flash flood was struck in 4 district in Morowali residence. Beside Morowali Residence, the other residence which has the same problem is Tojo Una-una Residence. It since the two residence was located on the same mountain. So, it means the same catastrophic disaster wouldpossible occurred in the Tojo Una-una Residence in the next. From many rivers in Tojo Una-una’s residence, the most frequently occured flash flood is Podi River. However, the geospatial survey and field survey has worked on the site directly. The geospatial survey was made by satellite imaging then analyze it by some computer software, and make soe interpretation. The field survey has worked further by visual analyzing, taking picture for documentation, taking soil or rock sample, and interviewing the local citizens. The result is critical slope and damaged was observed, sedimented area, the potential area to sledge has appear. There are many additional important inforation got, such as the + 169,84 Ha critical slope fail area, the + 300 m height of critical slope, and the potential volume of the next landslide material is + 509.250.000 m3. From land survey, the information gets is the vegetation on the location is still in good condition. The top soil for plant nutrition and grew media just 1,0 – 2,0 m depth. The clay layer is only about 30,0 cm depth. The weathered rock is dominate on this soil stratification. Finally, it can conclude that the remote sensing technology is very helpful and useful to makes some preliminary interpretations. This results most followed by field survey to make sure and high accuracy about the real situations there. The landslides was caused by weathered rock, high rainfall intensity, mega landslides was occurred in up stream, The new landslide profile was made the contour bowl alike and this condition is believed why does The Podi River always caused flash flood in the huge amount.

Keywords: Geographic Information System, Remote Sensing, Natural Disaster, Landslides, Flash Flood


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ENGINEERING JOURNAL: DESAIN MODIFIKASI TRAY AERATOR DALAM MENURUNKAN KADAR BESI AIR TANAH BERSKALA RUMAH TANGGA

Jurnal REKAYASA Volume 7 Nomor 2 Artikel 12

Ririn Endah Badriani
(Staf pengajar Jurusan Teknik Sipil, Fakultas Teknik, Universitas Jember)

ABSTRACT: High concentration of iron in water can cause aesthetic problems and unpleasant taste if the water is drunk. One of the methods used to remove iron is aeration. The objectives of this research is to get dimension of modification of tray aerator and sedimentation basin scale housing, so this is expected that output water already appropriate with the standard of water quality, it’s pursuant to decree of Health Minister, No 907/KEPMEN/2002. The result showed that for the reduce the iron of ground water at 5 mg/l, initialDO 3,5 mg/l and flowrate 0,18l/s is required dimensions aerator: perforated pipe with diameter 2 cm,length 53 cm, 100 orifice,orifice diameter 2mm, the distance between holes 5 mm. Sedimentation basin dimensions 200 cm x 50 cm, free board 11,3 cm.

Keywords : iron removal, aeration, sedimentation

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ENGINEERING JOURNAL: ANALISIS PERBANDINGAN PONDASI BETON TELAPAK PRACETAK DENGAN PONDASI BATU KALI PADA PERUMAHAN TIPE SEDERHANA

Jurnal REKAYASA Volume 7 Nomor 2 Artikel 11

Jojok Widodo Soetjipto
(Staf pengajar Jurusan Teknik Sipil, Fakultas Teknik, Universitas Jember)

ABSTRACT: In the low cost housing, the foundation that is often used is the stone foundation whose implementation require the mobilzation more materials and labor. While the project is currenly forced to be more rapid, efficient and higher quality. The application of precast system can be a solution. Precast foundation is a concrete foundation that molded and fabricated in casting yard and site installation. This study aimed to compare the use of the stone foundation with precast foundation in term of cost and implementation time. Results obtained by dimensional analysis calculation sloof and precast foundation for a length of 2 m is the 10/20 cm and 65x65 cm, length 3 m is 17/25 cm and 85x85 cm, and for length of 4 m is 23/33 cm and 100x100 cm. While the comparison of the two types of foundation show that the efficiency gained in the use of precast foundation of 5.14% on average with the acceleration of the implementation time of 56,93% on average.

Keywords: Pondasi batu kali, pondasi pracetak, perumahan sederhana


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ENGINEERING JOURNAL: ANALISIS PERFORMA ASPAL BETON (AC) TERHADAP RENDAMAN AIR DENGAN VARIASI TEMPERATUR DAN WAKTU

Jurnal REKAYASA Volume 7 Nomor 2 Artikel 10

Eri Andrian Yudianto
(Dosen dan Peneliti di Institut Teknologi Nasional Malang)

Lila Ayu Ratna Winanda
(Dosen dan Peneliti di Institut Teknologi Nasional Malang)

ABSTRACT: Road flexible pavement was obviously designed to perform load traffic services in various environment and the others condition. One of the most pointed things here is about how to resist in humidity or water intrusion. This factor is became the most attending factor to evaluate. If the flexible pavement occurred, the primary damage was occurred in the surface. If the surface has defect, the water inrussion would able to enter and crushed the lower layer. This research has focused in the effect of water intrusion and its temperature variation on durability of Asphalt Concrete pavement. The bituminous was used here is Hydrocarbon Asphalt 60/70, Gravel as Coarse Agregate, Sand as Fine Agregate, and Rock Fly Ash as Filler. The flexible pavement characteristics was evaluated here is Stabiblity, Flof, VIM, VMA, and MQ. Soaking process has worked on 24oC, 30oC, dan 45oC, and the asphalt concentration in mix is 4%, 4,5%, 5%, 5,5% dan 6%. Duration of soaking is 1, 3, 5, and 10 days. The material specification is according to the Bina Marga and the testing procedure is according to the Indonesian regulation “Pelaksanaan LASTON Jalan Raya”. The chemical influence of water is not evaluated or measured here. All the sample was same made in dimension and its composition (5 samples was made on each test). After several calculation did the optimum asphalt content has 4,871%. The test results are shown the duration of soaking and rising temperature give significant influence for the stability value with average of durability index is 19,981%. The flow index is decreased in average 20,126%. The VIM index is increased in average 18,149%. The VMA index is inclined in average 5,05%. The MQ index is remain steady, since MQ is the result of proportion of stability and flow. In conclusion, the decline flexible pavement mix perform is still in the accaptable area of Bina Marga’s regulation above 75%. It means, the 10 days soaking duration of asphalt mix is still in acceptable. However, no further road surface layer recondition needed.

Keywords: Asphalt durability, asphalt characteristics, soaking,duration and temperature.


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