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EROSION PATTERN BELOW A CONCRETE APRON BY FLOW FROM A TAILRACE TUNNEL

ZAKARIA, JULIANA (2007) EROSION PATTERN BELOW A CONCRETE APRON BY FLOW FROM A TAILRACE TUNNEL. Universiti Teknologi PETRONAS. (Unpublished)

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Abstract

The analysis erosion occurrence below a concrete apron by flow from a tailrace tunnel is presented. The outcome from the analysis was used to determine the appropriate arrangement and sizes of baft1e blocks to protect the bed material of the physical model from being eroded by the flow. The project was started with literature review on the basic concept of dam, sediment transport, properties of sediment, armoring and hydraulic jump. Study on erosion pattern which was conducted by other professional is also highlighted in the literature review. The study on analyzing scour occurrence has been conducted to explain the similarity existing in the scour process and profile including dune in the downstream of the scour hole. Altogether, twelve experiments to study the erosion profile have been carried out using six types of baft1e block arrangements including two experiments without using the baft1e blocks. The experiments took place at Pergau Pond Model in UTP lab. Sieve analysis test was conducted prior to the beginning of the experiment to determine the size of sediments that were used throughout the project. Sediments size used in the project range from 300J.!m to 350J.!m. Two discharges used in the project were 121/s and 301/s. The purpose of choosing the discharge are to ensure that the constant parameter being used. The reason being is also to observe the severity of the erosion occurrence if the discharge is too small and also if it is too large. It took one hour to complete each test. The pictures of scour pattern were taken as materials to be analyzed. Also, the patterns were drawn to scale whereby a plastic cover was spread onto the sediments. The maximum distance of scour dispersion from the apron were measured. Five lines of measurements were selected to measure the scour profile downstream the apron. The result indicated that the most severe erosion occurred at the downstream of the incoming flow from the tailrace tunnel. From the observation and comparison of maximum scour depth, the findings proved that Set 4 is the most efficient energy dissipater.

Item Type: Final Year Project
Academic Subject : Academic Department - Civil Engineering - Structures, materials and construction
Subject: T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Engineering > Civil
Depositing User: Users 2053 not found.
Date Deposited: 24 Oct 2013 15:00
Last Modified: 25 Jan 2017 09:45
URI: http://utpedia.utp.edu.my/id/eprint/9800

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