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Istiarto Istiarto
Jurusan Teknik Sipil dan Lingkungan (JTSL , Fakultas Teknik, UGM Yogyakarta
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Journal : Civil Engineering Forum Teknik Sipil

 1 
SIMULASI NUMERIS TIGA DIMENSI KANTONG LUMPUR BENDUNG SAPON Nindito, Dwi Anung; Istiarto, Istiarto; Kironoto, Bambang Agus
Civil Engineering Forum Teknik Sipil Vol 18, No 1 (2008): JANUARI 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

The success factor of a settling basin planning is the trap efficiency. In reality, it is difficult to create a detailed physical model of the sedimentation process. In a more detailed way, sedimentation process phenomena can be formulized by using mathematical equation, for this matter numerical simulation is selected to observe the settling basin performance. A three-dimensional numerical model from SSIIMWin 1.1 is used to carry out this settling basin simulation of the Sapon weir planning. The trap efficiency of the sedimentation process is observed in two different situations: at the time when the settling basin is empty and when it is full. During the empty situation, the velocity and the initial trap efficiency process is measured. When the settling basin is full, inspection is performed to check whether the sedimentation trap process remains effective. The trap efficiency depends on the characteristics of the inflowing sediment (fall velocity of the particle) and the water flow characteristic in the settling basin (flow velocity). Flow velocity simulation is demonstrated using a three-dimensional velocity vectors. Velocity distribution simulation indicates that the value of the horizontal flow velocity component from the upstream to the downstream (augmentation of x/b value) is decreased. The minimum horizontal flow velocity occurs in locations close to the bottom of the bed channel and increasing towards z/h to the surface water. Approaching the wall, the horizontal flow velocity is decreasing and reaches it’s maximum at y/B=0.5. The flow vertical velocity component indicates that approaching the bed channel, the vertical velocity is increasing. The lateral flow velocity component indicates a velocity increase at the horizontal expansion. A three-dimensional vortex occurs on the inlet of the settling basin, due to the vertical expansion. The vortex does not exist in the middle location of the settling basin. Another vortex occurs at the bottom of the channel approaching the downstream of the settling basin. The profile of sediment concentration distribution indicates an increase from the water surface to the bottom (bed channel). The sediment concentration is decreased in quantity to the downstream of the channel. The ratio of the incoming sediment that is deposited (trapped) and inflow the sediment mass entering a settling basin is 69,85 % for the upper 0.06 mm diameter particles. Volume changes of the pond, due to the deposit sediment volume, have lead to a decline in the trap efficiency process. When the volume of the sediments reaches a percentage of 71,84 % of the total pond volume, the settling basin is considered ineffective in performing sedimentation trap process.
UNJUK KERJA ALTERNATIF PENGENDALIAN BANJIR BATANG ANAI DAN BATANG KANDIS SUMATERA BARAT Eriza, Corri; Istiarto, Istiarto; Sujono, Joko
Civil Engineering Forum Teknik Sipil Vol 18, No 2 (2008): MEI 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

Flood occurs almost every year due to the floatation of Batang Anai and Batang Kandis. In 2001, the local authority made a plan to control the flood in both rivers, which was implemented in Anai-Kandis River Improvement with the alternatives of controlling flood by handling the river courses, such as improving and widening the river channel, and decreasing the peak of discharges by making dams or retarding basin. Performance of flood control structures are made of three alternatives based on the information gathered. First alternatives suggest for repairing the river course and widening the river channel (with levee) in both rivers and floodway in Batang Kandis. Second alternative is similar with the first alternative except negation the leeve in Batang Anai and replenishment of floodgate in Batang Kandis. Third alternative for Batang Anai is identical to the second alternative and also widening the river channel throughout Batang Kandis. The analysis includes the analysis of sufficiency of channel to drain the design discharge and sediment transport analysis for the alternative with the best performance, which both could be doing with auxiliaries of Software HEC-RAS version 4.0 betas. As the result, controlling river by repairing the river course and widening the river channel throughout Batang Anai and Batang Kandis (3rd alternative) gives the best performance comparing to the others alternatives, due to the fact that it could be able to canalize the design discharge of Q50 (1417 m3/s) in Batang Anai and Q25 (293 m3/s) in Batang Kandis. The simulation of transport sediment in Batang Anai with the 3rd alternatives implementation shows the biggest trend of erosion and deposition in a row, located next to National bridge downstream (RS 108) and precisely in downstream of RS 108 i.e., RS 107.
KAJIAN GENANGAN BANJIR SUNGAI MUKE DI KABUPATEN TIMOR TENGAH SELATAN PROVINSI NUSA TENGGARA TIMUR DAN UPAYA PENGENDALIANYA Nahak, Priska G.; Istiarto, Istiarto; Yulistyanto, Bambang
Civil Engineering Forum Teknik Sipil Vol 18, No 2 (2008): MEI 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

Muke River is an ephemeral river located in District of Timor Tengah Selatan, Nusa Tenggara Timur Province. Flood occurs during rainy season inundating farm land and residensial area. Previous work has been done by Petrus G Bay (2007) indicated that flood levee and river normalization, could not purent flood from flowing into river bank around Oebelo and Toineke villages. Present work deals with flood prevention by the use of retention area to reduce peak discharge and/or flood water level. Flood simulation was performed by the aid of HEC-RAS mathematical model. The result of simulation show that the main cause of flood retention is the limited flow capacity of the river. Under existing condition and Q10=575 m3/s, river bank overflows occurs in 83.4% of entire river reach. Three retention areas of 3 x 50 ha are proposed along Muke River. These can reduce the peak flow by 73% and river bank overflow by 69%.
STUDI ALTERNATIF PENGENDALIAN BANJIR SUNGAI TONDANO DI KOTA MANADO J.B. Nanlohy, Benjamin; Jayadi, Rachmad; Istiarto, Istiarto
Civil Engineering Forum Teknik Sipil Vol 18, No 1 (2008): JANUARI 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

Tondano River, along with its tributary Tikala River, is very potential to cause flood in Manado City. There were three big floods occurred in 1996, 2000 and 2005. In order to mitigate the damage risk due to flood, the controlling effort that can be applied soon in the field is required through short term flood control plan using structural measures. The feasible alternative plans should be evaluated to define the best plan based both on the hydraulics point of view and their effects on the river uses. The study is carried out through the 5 year return period flood routing using the version 3.1 HEC-RAS software. The selected design flood hydrograph is obtained using Nakayasu Synthetic Unit Hydrograph method by elaborating design rainfall derived from partially series rainfall data frequency analysis of Tondano and Tikala watersheds. Flow simulation is conducted in steps by modeling the hydrograph from Tikala River as the lateral inflow. The first simulation is carried out using bank full capacity discharge to define the flood characteristic and the critical sections. The second simulation is carried out for the design flood hydrograph using unsteady flow calculation on each plan to study the hydraulics feasibility. The study conducted herein is elaborated on water surface profile and velocity due to the plans affectivity to carry-off the flood discharge safely as well as the effect on river uses.  Based on the existing condition simulation, result shows two reach critical sections of the right bank and one reach critical section of the left bank Tondano River. The results of flood control simulation indicate that there are no significant differences on velocity among plans, but there are disparities on the capacity to carry off flood discharge safely with no overtopping. For the normalization plan, the overtopping is occurred along the critical section, whereas for both dike plan and combination of dike and normalization plan, no overtopping are occurred but the the critical sections are still existed. Revised plans for dike and combination of dike and normalization are equally effective in carrying off flood discharge securely, but have different effects on water utilization during low flow period. Referring to the study result, the best alternative is the revised dike plan.
Co-Authors Akbar, Sulung Alfianto Apriyani Apriyani Astawa, I Ketut Bambang Agus Kironoto Bambang Yulistyanto Benjamin J.B. Nanlohy Budi Wignyosukarto Cahyani, Khiara Asriningtias Chairil Anwar Corri Eriza Djoko Legono Duhita, Anselma Diksita Prajna Dwi Anung Nindito Hariyadi, Joko Sugeng I Made Suarta Jeni Susanti Joko Sujono Made Dana Saputra Priska G. Nahak Putri, Anisa Karunia Rachmad Jayadi Rahardjo, Adam Pamudji Raharjo, Adam Pamudji Rahmatullah, Ilham Rismayanti Rismayanti Rosdiana Rosdiana Sabrina, An'nisa Dinah Setiawan, Andreas Rema Suardani, Anak Agung Putri SUMADI SUMADI Sumiadi, Sumiadi Susilawati, Rosi ulumuddin, Muhammad Ihya Wignyosukarto, Budi Santoso Yeri Sutopo Yuni Lestari