scholarly journals ANALISIS PENGGUNAAN BLOK PENYEKAT (BAFFLE BLOCK) UNTUK MEREDUKSI GERUSAN PADA ABUTMENT PILAR JEMBATAN

2021 ◽  
Vol 5 (2) ◽  
pp. 85-95
Author(s):  
Lutfi Hair Djunur ◽  
Kasmawati Kasmawati
Keyword(s):  
Baffle Block

Gerusan lokal merupakan proses alamiah yang terjadi disungai akibat perubahan morfologi sungai atau adanya bangunan air yang menghalagi aliran. Adanya bangunan  air tersebut meyebabkan perubahan karakteristik aliran yang berpengaruh terhadap gerusan disekitar abutmen pilar jembatan. Untuk melindungi abutmen pilar jembatan dari penggerusan, diperlukan suatu desain bangunan blok penyekat yang mampu mereduksi gerusan dari derasnya aliran air sehingga abutmen pilar jembatan dapat terlindungi. Pada penelitian ini dibuat model berupa abutmen pilar jembatan dengan blok penyekat. Dengan menggunakan 3 model blok penyekat yang berbeda dimensi ini menggunakan tiga variasi debit yang berbeda dalam empat kali simulasi pengaliran. Berdasarkan hasil analisis dan perencanaan blok penyekat diperoleh efektifitas dalam mereduksi gerusan disekitar abutmen pilar jembatan, yaitu dimensi blok penyekat 1:1, blok penyekat 1:3 dan blok penyekat 1:5. Ketiga model blok penyekat untuk mengetahui perubhan penampang saluran. pola gerusan, volume gerusan dan parameter aliran yang terjadi disekitar abutmen pilar jembatan.Penelitian jembatan adalah tanpa blok penyekat yaitu 32,80%, blok penyekat 1:1 yaitu 43, 32%, blok penyekat 1:3 yaitu 10,01 %  dan blok penyekat 1:5 yaitu 47,77 %. Hasil dari simulasi pengaliran menunjukkan gerusan maksimum bergantung  pada kecepatan  aliran , tinggi aliran,angka Froude, Reynold dan blok penyekat

A Study of the Average Flow in Open Channel with Baffle Blocks Distributed Uniformly

10.29007/zx1w ◽  
2018 ◽  
Author(s):  
Dung Tien Tran ◽  
Anh Tuan Le ◽  
Hong Nhung Le ◽  
Viet Hung Ho
Keyword(s):  
Water Level ◽  
Water Depth ◽  
Open Channel ◽  
Block Size ◽  
Average Flow ◽  
Modelling Studies ◽  
Baffle Block

A study of average flow in open channel with baffle blocks distributed uniformly has been considered by using channel with varied slopes. In this article, experimental and modelling studies were introduced when the correlation between the water depth and baffle block size is significant. The objective of the work is to give the rudimentary relations between discharge and water level in the channels. When the water depth is large, the effect of bottom channel friction on the flow is relatively small. This paper also gives applications of the software ‘Telemac-2D’ to simulate the flow under different conditions.

scholarly journals EFFECT OF ARRANGEMENT OF CYLINDER TYPE BAFFLE BLOCK ON DRAG FORCE AT DOWNSTREAM OF STEEP CHANNEL

2006 ◽  
Vol 50 ◽  
pp. 877-882
Author(s):  
Kouki ONITSUKA ◽  
Juichiro AKIYAMA ◽  
Mirei SHIGEDA ◽  
Tatsuya NAKAGAWA
Keyword(s):  
Drag Force ◽  
Baffle Block

Investigations of the Hydraulic Characteristics of Stilling Basin with Baffle-Blocks Using an Integrated SPH Method

2019 ◽  
Vol 17 (08) ◽  
pp. 1950051
Author(s):  
X. J. Ma ◽  
Y. L. Yan ◽  
G. Y. Li ◽  
M. Geni ◽  
M. Wang
Keyword(s):  
Energy Dissipation ◽  
Incompressible Flows ◽  
Particle Methods ◽  
Solid Boundary ◽  
Discharge Process ◽  
Sph Method ◽  
Stilling Basin ◽  
Dissipation Effect ◽  
Kernel Gradient Correction ◽  
Baffle Block

The stilling basin has been one of the most powerful hydraulic structures for the dissipation of the flow energy. Meshfree and particle methods have special advantages in modeling incompressible flows with free surfaces. In this paper, an integrated smoothed particle hydrodynamics (SPH) method is developed to model energy dissipation process of stilling basins. The integrated SPH includes the kernel gradient correction (KGC) technique, the dynamic solid boundary treatment, [Formula: see text]-SPH model and density reinitialization. We first conducted the simulations of dam-breaking and hydraulic jump to validate the accuracy of the present method. The present simulation results agree well with the experimental observations and numerical results from other sources. Then the discharge process of stilling basin with baffle-blocks is simulated with the integrated SPH. It is demonstrated that the detailed discharge process can be well captured by this method. The energy dissipation effect of stilling basin could be significantly improved by the baffle-blocks. The structure and position of the baffle-block directly affect the energy dissipation effect, while the height of the baffle-block has big influence on the drainage capacity.

scholarly journals The Effects of Different Shaped Baffle Blocks on the Energy Dissipation

2020 ◽  
Vol 6 (5) ◽  
pp. 961-973
Author(s):  
Nassrin Jassim Hussien Al-Mansori ◽  
Thair Jabbar Mizhir Alfatlawi ◽  
Khalid S. Hashim ◽  
Laith S. Al-Zubaidi
Keyword(s):  
Energy Dissipation ◽  
Hydraulic Jump ◽  
Concrete Block ◽  
Naval Research ◽  
Irrigation Systems ◽  
Force Ratio ◽  
Stilling Basins ◽  
Baffle Block ◽  
Length Reduction ◽  
Better Than

Stilling basins can be defined as energy dissipaters constructed of the irrigation systems. This study aims at investigating the performance of the new seven baffle blocks design in terms of reducing the dimensions of stilling basins in irrigation systems. In order to assess the hydraulic efficiency of a new model for baffle block used in stilling basins, a Naval Research Laboratory (NRL) has conducted. The results of this study demonstrate that the performance of the new baffle block, in term of hydraulic jump length reduction and hydraulic energy dissipation, it's better than standard blocks. However, the ratios of the drag resistance attributed to the new baffles block (FB / F2) have been larger than that applied on the normal block. It was found that the new block dissipates the energy by 9.31% more than the concrete block, and decreases the length of the hydraulic jump by 38.6% in comparison with the standard blocks. However, the new block maximizes the drag force ratio by 98.6% in comparison with the standard baffle blocks. The findings indicated that in terms of energy reduction and dissipation in the length of the hydraulic jump, the new block is superior to the other kinds.

scholarly journals Experimental Study for Energy Dissipation Using Stilling Basin with One and Two Consecutive Drops

2014 ◽  
Vol 7 (2) ◽  
pp. 61-28
Author(s):  
Qassem H. Jalut ◽  
Nagla F. El-Baaja
Keyword(s):  
Energy Loss ◽  
Relative Energy ◽  
Excess Energy ◽  
Relative Height ◽  
Stilling Basin ◽  
Block Height ◽  
Different Types ◽  
Engineering Department ◽  
Bed Slope ◽  
Baffle Block

The scour at downstream of hydraulic structures is one of the major concern in its stability analysis and operation .The excess energy existing immediately downstream of such structures has to be controlled. Hence, it is necessary to design and install a device for dissipating excess energy in order to prevent downstream scour. The drop structures is one of the commonly structures used for dissipating excess energy.In the present study an experimental approach is employed through which different types of stilling basin with different heights were tested using one drop and two consecutive drops. Moreover the effect of the end sill and baffles with different heights and different bed slopes was investigated. The hydraulic parameters involved were measured experimentally using a model of straight drop installed in the available (S6) multi-purpose flume in the fluid mechanics lab at the Civil Engineering Department, University of Garyounis.Results showed that, for one drop the presence of end sill reduced the length of the jump by a small value approximately 4%with an increase of relative energy loss by a small value. The increase of relative baffles block height increases the optimum relative height of drop (w/y1=6), and the relative energy loss .For two consecutive drops it was found that the most value of energy loss takes place in the second basin. The presences of end sill at the end of second basin increases the performance of second basin by small value approximately 5%. It is also shown that increasing the relative height of baffles blocks lead to increases in the relative energy loss (within the ranges considered in this study), and the optimum relative baffle block height hb/y1=0.77 to 1.7 and bed slope is 1/50

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