Bedload Sediment Concentration of Sungai Kahang Downstream Kahang Dam in Johor

Adnan, Mohd Shalahuddin; Nda, Muhammad; Razi, Mohd Adib Mohammad; Yusoff, Mohd Azlan Mohd; Rahmat, Siti Nazahiyah; Abustan, Muhammad Salleh; Tajudin, Saiful Azhar Ahmad

doi:10.30880/ijie.2018.10.02.028

Cited by 4 publications

(3 citation statements)

References 6 publications

(7 reference statements)

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“…In order to harness hydro potential efficiently for a hydroelectric power station using a crossflow turbine as prime mover, Figure 11 suggests the turbine designers that the crossflow turbine should be designed with specific speed 95 up to 105 (rpm, kW, m) and the figure also recommends to turbine operators that the turbine should be operated at specific speed in between 95 up to 105 (rpm, kW, m). Further, the turbine desainers should be wise to choose nozzle entry arc which determines runner diameter and runner width in accordance with the strength of the material used in constructing the turbine in order to assure the turbine endurance in the operation [27,28]. Figure 10shows the curves of efficiency η versus speed ratio nop/nrunawayfor the turbine model with nozzle entry arc of 75 o , 90 o and120 o operating at 500 rpm rotational speed.…”

Section: Eficiency ηmentioning

confidence: 99%

The Performance Characteristics of The Low Head Cross Flow Turbine Using Nozzle Roof Curvature Radius Centered on Shaft Axis

Sutikno

Soenoko

Soeparman³

et al. 2019

IJIE

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The experimental study was intended to investigate the performance characteristics of three cross flow turbine models using nozzle roof curvature radius centered on shaft axis designed on the same flow rate, runner diameter and rotational speed with each model having different runner width as well as its nozzle entry arc. The nozzle and runner width were designed as the fuction of the nozzle entry arc, the shorter pair of runner-nozzle, the larger nozzle entry arc and vise versa. The nozzle entry arcs used in this experimental study were 75 o , 90 o and 120 o. In addition, the three models had equal cross sectional area of nozzle entry. The three turbine nozzles were designed to have roof curvature radius centered on shaft axis. The nozzle roof curvature were expected to be able to deliver water in better direction as well as its flow condition as the water entered the tubine runner. The experimental test rig consisted of three turbine models, pump, piping systems, magnetic flow meter, and tachometer. The Flow rates, that entered the turbine, supplied by the pump, were measured by the magnetic flow meter. The power generated on the turbine shaft was determined by measuring the torsion forces detected by using a spring balance and turbine speeds were detected by a hand held tachometer. The turbine performance characteristics were shown by the relation of efficiency versus flow rate, head, and specific speed; as well as the relation of efficiency versus velocity ratio and speed ratio. The velocity ratio was the ratio of runner pheripheral velocity to water jet velocity that entered the runner; the speed ratio was the ratio of runner speed to water jet speed entering the runner. The results of the study indicated that best efficiency points increased as the nozzle entry arc decreased or on the other hand best effisiency points decreased as the nozzle entry arc increased. The results showed that the cross flow turbine using 75 and 90 degree entry arcs indicated efficiency and power which was higher than that of turbine with 120 degree nozzle entry arc.

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Section: Eficiency ηmentioning

confidence: 99%

The Performance Characteristics of The Low Head Cross Flow Turbine Using Nozzle Roof Curvature Radius Centered on Shaft Axis

Sutikno

Soenoko

Soeparman³

et al. 2019

IJIE

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“…Other customised bedload samplers were used in determining bedload sediment measurement in small cobble and coarse gravel bed dominated stream (Bunte et al , 2004). Furthermore, the design and customisation of other bedload samplers such as Adnan et al (2018), Childers et al (2000) and Liu et al (2011) were used successfully in field measurements with acceptable results. There are several conventional methods used to collect samples including:…”

Section: Helley–smith Samplermentioning

confidence: 99%

A review of field methods for suspended and bedload sediment measurement

Nda

Adnan

Yosuff

et al. 2019

WJE

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Purpose Sediment measurement is usually accessible on a periodic or distinct basis. The measurement of sediment (suspended and bedload), especially in the field, is vital in keeping essential data of sediment transport and deposition. Various techniques for measuring sediment have been used over time each with its merits and demerits. The techniques discussed in this paper for suspended sediment include bottle, acoustic, pump, laser diffraction, nuclear and optical. Other techniques for bedload measurement are; River bedload trap (RBT), CSU/FU bedload trap, Helley–Smith, Polish Hydrological Services (PIHM) device, pit and trough, vortex tube, radioactive traces and bedload–surrogate technologies. However, the choice of technique depends on multiple factors ranging from budget constraint, availability of equipment, manpower and data requirement. The purpose of this paper is to present valuable information on selected techniques used in sediment measurement, to aid researchers/practitioners in the choice of sediment measurement technique. Design/methodology/approach This paper presents a general review of selected field techniques used in sediment measurement (suspended and bedload). Each techniques mode of operation, merits and demerits are discussed. Findings This paper highlights that each technique has its peculiar merits and demerits. However, two techniques are generally preferred over others; the bottle sampling and the Helley–Smith sampler for measuring suspended and bedload sediment. This is because the applicability of these techniques is quite widespread and time-tested. Originality/value This review paper provides an in-depth description and comparison of selected existing field sediment measurement techniques. The objective is to ease decision-making about the choice of technique, as well as to identify the suitability and applicability of the chosen technique.

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“…Similarly, studies by [13,14] presented the effects of damming as regards suspended sediment trapping and flow reduction for the Yangtze River and Mekong River, respectively. Besides, authors [15] carried out a study downstream Kahang River on bedload sediment concentration variabilities due to Kahang Dam. Therefore, further studies are needed to examine the response of river morphology downstream dam reaches considering many factors such as sediment transport, flow regime, hydrological pattern, channel bed, and bank erosion.…”

Section: Introductionmentioning

confidence: 99%

Morphological Adjustment of Kahang River Consequent to Construction of Kahang Dam

Nda

Adnan

Yusoff

et al. 2020

PoS

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In a tropical country like Malaysia, the availability of research works to monitor channel changes as a response to situating a dam over an observation period may help to establish new management strategies. These investigations will constitute a vital approach in assessing the changes to channel morphology downstream due to the presence of a dam and its operations. In the present study, the effects of Kahang Dam on Kahang River morphology, in particular, the downstream section was investigated and analyzed between January 2017 to January 2018. The rainfall pattern of the study period, the flow regime concerning the period, and geomorphological channel adjustments were carried out during the field surveys over a 400 meters reach. Different responses were leading to high flow and low flow regimes during periods with and without any interference due to dam operations. Similarly, the river channel was characterized by adjustments and realignments, causing modifications to the river morphology. Changes in cross-sectional area and local incision were also noticed as a direct response to sediment deficit and bank erosion process.

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Bedload Sediment Concentration of Sungai Kahang Downstream Kahang Dam in Johor

Cited by 4 publications

References 6 publications

The Performance Characteristics of The Low Head Cross Flow Turbine Using Nozzle Roof Curvature Radius Centered on Shaft Axis

The Performance Characteristics of The Low Head Cross Flow Turbine Using Nozzle Roof Curvature Radius Centered on Shaft Axis

A review of field methods for suspended and bedload sediment measurement

Morphological Adjustment of Kahang River Consequent to Construction of Kahang Dam

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