scholarly journals Open Channel Sluice Gate Scouring Parameters Prediction: Different Scenarios of Dimensional and Non-Dimensional Input Parameters

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 353 ◽  
Author(s):  
Ali Yousif ◽  
Sadeq Sulaiman ◽  
Lamine Diop ◽  
Mohammad Ehteram ◽  
Shamsuddin Shahid ◽  
...  
Keyword(s):  
Scour Depth ◽  
Sluice Gate ◽  
Analysis Technique ◽  
Dimensionless Groups ◽  
Scour Hole ◽  
Adaptive Regression ◽  
Learning Machine ◽  
Bed Material ◽  
Statistical Metrics

The determination of scour characteristics in the downstream of sluice gate is highly important for designing and protection of hydraulic structure. The applicability of modern data-intelligence technique known as extreme learning machine (ELM) to simulate scour characteristics has been examined in this study. Three major characteristics of scour hole in the downstream of a sluice gate, namely the length of scour hole (Ls), the maximum scour depth (Ds), and the position of maximum scour depth (Lsm), are modeled using different properties of the flow and bed material. The obtained results using ELM were compared with multivariate adaptive regression spline (MARS). The dimensional analysis technique was used to reduce the number of input variable to a smaller number of dimensionless groups and both the dimensional and non-dimensional variables were used to model the scour characteristics. The prediction performances of the developed models were examined using several statistical metrics. The results revealed that ELM can predict scour properties with much higher accuracy compared to MARS. The errors in prediction can be reduced in the range of 79%–81% using ELM models compared to MARS models. Better performance of the models was observed when dimensional variables were used as input. The result indicates that the use of ELM with non-dimensional data can provide high accuracy in modeling complex hydrological problems.

scholarly journals The influence of sandy clay bed material to local scour behaviour

2017 ◽  
Vol 35 (1) ◽  
pp. 193-202
Author(s):  
Nina B. Rustiati ◽  
Very Dermawan ◽  
R. Rispiningtati ◽  
Lily M. Limantara
Keyword(s):  
Water Level ◽  
Open Channel ◽  
Flow Model ◽  
Local Scour ◽  
Coefficient Of Determination ◽  
Sluice Gate ◽  
Gate Opening ◽  
Bed Material ◽  
The Relationship

Abstract As a type of gate that is used to control the water level upstream, sluice gate is the gate with simple shape and outstanding ability to flush the sediment. The operation of the gate is considered an important process. The up and down movement of the gate would affect the velocity and cause local scour as the result of fluctuating rate. This research aims to assess the effects of discharge and gate-opening height variations, as well as the type of bedchannel material, on the change of depth of scour (ds). The research was conducted of open channel flow model with a sluice gate able to up and down movement. The discharges used in the research were 9 types ranging from 1.0 to 5.0 dm3·s−1. There were 5 variations in the height of gate-opening ranging from 0.5 to 2.5 cm at intervals of 0.5 and types of channel-bed material. The results of the research showed that the depth of scour can be analysed as a function of discharge, height of gate-opening, height of water level upstream and downstream, and the type of bed material used. The scour depth equation on is $d_s = 1.7822\left( {{Q \over a}} \right)^{1.1347} a$ . Calculated coefficient of determination of the relationship between two types of channel-bed material and the depth of scour was R2 = 0.946. Consequently, it can be concluded that the equation can be applied on both types of bed-channel material.

Effect of grain size on local channel scour below a sluice gate

2001 ◽  
Vol 28 (3) ◽  
pp. 440-451 ◽  
Author(s):  
J A Kells ◽  
R Balachandar ◽  
K P Hagel
Keyword(s):  
Grain Size ◽  
Flow Rate ◽  
Image Data ◽  
Local Scour ◽  
Scour Depth ◽  
Sluice Gate ◽  
Time Period ◽  
Depth Video ◽  
Bed Material ◽  
Cohesive Bed

In this study, the effect of grain size on the dynamics of local scour processes is discussed in the context of the erosion that takes place downstream from a submerged sluice gate. Four gradations of non-cohesive bed material were used to study the scour process for various tailwater depth and flow rate conditions. The sand gradations included three sizes of uniformly graded sand and a fourth size, which was obtained by mixing the three uniform sands in equal proportions by weight. A total of 36 tests was carried out, each for a period of 24 h. An equilibrium scour condition was not attained over this time period for any of the tests, although a sense of similarity in the bed profiles is observed in the region close to the sluice gate. The present results indicate that the depth and the area of scour are highly dependent on the bed grain size, both increasing as the grain size is reduced. As well, it was found that the tests with a mixed (i.e., graded) sand bed resulted in less scour relative to those in which a uniformly graded sand of similar grain size was used. Moreover, the maximum scour depth increases with increases in the discharge and the tailwater depth. Finally, it was found that the location of the point of maximum scour depth, as measured from the upstream end of the erodible sand bed, moved downstream with an increase in either the discharge or tailwater depth and upstream with an increase in the grain size.Key words: grain size, grain size distribution, local scour, scour dynamics, sluice gate, tailwater depth, video image data acquisition.

scholarly journals Experimental study for determination of collar dimensions around bridge pier

2015 ◽  
Vol 10 (1) ◽  
pp. 89-96
Author(s):  
Afshin Jahangirzadeh ◽  
Shatirah Akib
Keyword(s):  
Experimental Study ◽  
Temporal Trend ◽  
Bridge Pier ◽  
Scour Depth ◽  
Scour Hole ◽  
Scour Countermeasure ◽  
Reduction Percentage ◽  
Shape And Size

The shape and size of a collar is important to maximize its effect as a scour countermeasure. Current research shows that the depth of the scour hole is decreased by using rectangular collars around circular piers. This study determined the approximate optimum dimensions for rectangular collars to minimize the temporal trend of scouring around a pier model. Effects of different sizes of rectangular collars on a model pier were investigated both at the upstream and downstream of the flume. It was observed that irrespective of the rectangular collar dimensions the upstream and the downstream were estimated to be 0.86 and 1.42, respectively. The optimum collar width was estimated to be 2.8 times the diameter of the pier. By using this optimized collar dimension, the non-dimensional depth of scour reached a min value of 0.034 at 72 h. The reduction percentage of the scour depth reached 98% at 72 h.

Pengaruh Kepuasan Kerja terhadap Organizational Citizenship Behavior (OCB) Alumni Diklat Kepemimpinan Tingkat IV di Provinsi Banten

2020 ◽  
Vol 16 (1) ◽  
Author(s):  
Enong Rostiawati
Keyword(s):  
Job Satisfaction ◽  
Organizational Citizenship ◽  
Organizational Citizenship Behavior ◽  
Leadership Training ◽  
Survey Methods ◽  
Citizenship Behavior ◽  
Entire Study ◽  
Analysis Technique ◽  
Study Population

Abstract: Organizational Citizenship Behavior (OCB) is a variable that can be influenced by job satisfaction. This study aims to determine the effect of job satisfaction variables on Organizational Citizenship Behavior OCB alumni level IV leadership training in Banten Province. This research uses a quantitative approach through survey methods. Data analysis technique used is simple linear regression. The population in this study were 40 respondents and the sample used was 40 respondents. Determination of the sample using total sampling techniques or samples taken from the entire study population. The results of the analysis and interpretation of research data show that the value of the regulatory coefficient of influence on job satisfaction on Organizational Citizenship Behavior (OCB) alumni of leadership training level IV is 0.740 thus it can be concluded that job satisfaction has a direct positive effect on Organizational Citizenship Behavior alumni training, meaning that improvement of satisfaction in IV level leadership training is 0.740. work has an impact on improving Organizational Citizenship Behavior for training alumni, So Organizational Citizenship Behavior for training alumni can be achieved through job satisfaction.Keywords: Job satisfaction, Organizational Citizenship Behavior, Leadership Training Alumni Level IV

DETERMINASI PEMBIAYAAN MUSYARAKAH

Equity ◽  
2015 ◽  
Vol 18 (1) ◽  
pp. 19
Author(s):  
Regi Oktaviyori ◽  
Praptiningsih Praptiningsih
Keyword(s):  
Significant Influence ◽  
Hypothesis Test ◽  
Third Parties ◽  
Analysis Technique ◽  
Sample Amount ◽  
Level Of Significance ◽  
Fund Return

This study aims to examine the determination of musyarakah financing in Bank Syariah Mandiri (BSM) period March 2008-December 2011. The data is obtainedbased on bank finance reporting that at publication. It is gained sample amount of 44 months. The analysis technique used here is multiple linier regression and hypothesis test using t-statistic and F-statistic with level of significance 5%. The result of this research is Third Parties Fund (DPK) and return gives significantly on musyarakah financing. The return on asset is not significant to musyarakah financing. By simultaneous, musyarakah financing give significant influence on the level of Third Parties Fund, return and return on asset.

Investigation of Impact Profile and Isolation Effect in Automated Impact Device Design and Control for Operational Modal Analysis

2015 ◽  
Vol 137 (9) ◽  
Author(s):  
Z. C. Ong ◽  
C. C. Lee
Keyword(s):  
Modal Analysis ◽  
Isolation Effect ◽  
Time Averaging ◽  
Impact Device ◽  
Lack Of Information ◽  
Analysis Technique ◽  
And Control ◽  
Phase Angles ◽  
Synchronous Time

A novel modal analysis technique called impact-synchronous modal analysis (ISMA) was introduced in previous research. With the utilization of impact-synchronous time averaging (ISTA), this modal analysis can be performed in presence of ambient forces whereas the conventional analysis method requires machines to be totally shut down. However, lack of information of phase angles with respect to impact in ISMA has caused it to be labor-intensive and time-consuming. An automated impact device (AID) is introduced in this study in the effort to replace the manually operated impact hammer and prepare it to be used in the current practice of ISMA on the purpose of enhancing its effectiveness and practicability. Impact profile and isolation effect are noted to be the contributing parameters in this study. This paper devoted on calibrating and controlling of the AID which gives the desired impact profiles as compared to the manual impact hammer. The AID is found effective in the determination of dynamic characteristics when the device is isolated from the boundary condition of the test structure.

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