Optimal Erosion Weir Design Selection

Richardson, Simon (2017) Optimal Erosion Weir Design Selection. [USQ Project]


Erosion is a problem that damages the environment and costs landholder a lot of money in treatment and repairs to the land. Installation of a weir in a creek can help reduce erosion by reducing the velocity head of flow.

This study used the geographic and hydraulic data for two sites to generate sediment transport models. There were 3 sample types of soil used as the channel bed material. These sites were modelled with various combinations of weir heights, frequencies and scour protection to measure the performance i.e. the overall reduction of erosion compared to having no weir.

One site placed weirs that allowed for different water gradients. The lower grade, there greater the reduction in erosion. The same model used different height weirs and found that the taller weirs were better at reducing erosion rather than more frequent, smaller weirs. They were also more cost effective on a steep slope. This steep site also demonstrated that a Timber weir design was the highest performing per dollar however it was not the cheapest solution.

The second more shallow site was used to measure the effect of scour protection and using 2 small weirs compared to one weir of equal total height. Taller weirs performed better than multiple single weirs. The cost benefit analysis demonstrated that soil type and weir design had a large impact on the overall cost benefit of a design.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Honours) (Civil)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Alam, Md Jahangir
Date Deposited: 08 Sep 2021 06:20
Last Modified: 08 Sep 2021 06:20
URI: https://sear.unisq.edu.au/id/eprint/40792

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