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Homework answers / question archive / ENV5104 S1 2023 – Report 2 Examiner: M

ENV5104 S1 2023 – Report 2 Examiner: M

Law

ENV5104 S1 2023 – Report 2

Examiner: M.H. Gillies

Due Date: 5th May 2023

Weighting: 20%

Objectives (from the course specification)

• Apply hydraulic principles to evaluate the process of sediment erosion, transport, deposition and river morphology;

• Apply hydraulic theory to evaluate pipeline flow and design pumped pipeline systems;

• Analyse the behaviour of coastal waves and currents and interactions with hydraulic structures;

• Undertake hydraulic analysis and employ hydraulic modelling principles to water flow and distribution systems.

Rationale

This assignment is based on the material covered in 3,5,6,7,8

 

Important Information

This is an individual task where you must complete the work yourself and must acknowledge all sources of information using appropriate referencing where required.

Before starting please review the USQ’s Academic Integrity Policy

https://policy.usq.edu.au/documents/13752PL

“The University considers behaviour by Students, which does not uphold the principles of

Academic Integrity and honesty and that misrepresents their academic achievement, to be

Academic Misconduct.”

For guidance on what constitutes Academic Misconduct and its various categories, at USQ refer to the USQ Student Academic Misconduct Policy available at:

https://policy.usq.edu.au/documents/14132PL

By submitting this assignment you hereby certify that:

The submission is entirely my own work except where due acknowledgement is made in the text and that no part has been copied from any other person’s work.

 

Special Instructions

All sources should be properly referenced using the Harvard referencing style. The Harvard

(AGPS) style to be used is defined by the USQ Library referencing guide

http://www.usq.edu.au/library/referencing.

Instructions for Submission

The assignment is to be submitted electronically via study desk. The link is available on assessment tab on the course studydesk.

Late Submissions (USQ Assessment Procedure)

“Assessment Items submitted after the published due date without an approved extension or submitted after the revised due date where an extension has been granted, will incur a penalty of 5% of the available Mark, per Calendar Day late”.

“Assessment Items submitted more than 10 Calendar Days after the published due date without an approved extension, or more than 10 Calendar Days after the revised due date where an extension has been granted, will receive a Mark of zero”

Assessment Tasks

This assignment is comprised of three tasks:

Task 1 – Surge Wave 30 marks

Task 2 – Erodible channel 70 marks

Task 3 – Pipe Network 100 marks Task 1 Surge Wave

A rectangular channel receives water from a larger main channel through an offtake regulated by a vertical sluice gate (similar to Figure 4.18 in the Studybook). This gate is positioned 300m downstream from the junction with the main supply channel. The sluice gate is opened or closed to achieve the desired flowrate.

 

Figure 1 – Top view of channel offtake

Normally the gate is opened and closed gradually and surge waves do not occur but you are interested to determine what would happen in this channel if the gate was suddenly moved.

The initial flow in the channel is equal to Q = 2.0 + N/10 m3/s where N is the last digit of your student number. The initial depth of flow in the channel at this flowrate is 1.40 m.e.g. if your student number is equal to 0061351304 then your initial flow will be equal to 2.0 + 4/10= 2.4 m3/s.

Your task is to determine the nature of the surge wave that would be generated if the gate was suddenly adjusted to deliver a flow of 80% of the initial flow and the time that the wave will take to reach the main supply channel.

For example if the initial flow was 2.4 m3/s the new flow would be 1.92 m3/s.

Repeat this same analysis for an adjustment of 60% of the original flow and discuss any differences.

 

YourTask:

• Determine the height of the wave and time to reach the supply channel for the 80% closure

• Determine the height of the wave and time to reach the supply channel for the 60% closure

• Write a brief discussion on your results and mention any limitations of this analysis.

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