ORCID Profile
0000-0002-6344-5993
Current Organisation
Deakin University - Geelong Campus at Waurn Ponds
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Water Resources Engineering | Civil Engineering | Infrastructure Engineering and Asset Management | Civil engineering | Infrastructure engineering and asset management | Water resources engineering |
Expanding Knowledge in Engineering | Water Services and Utilities
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2022
Publisher: SAGE Publications
Date: 2016
Abstract: Asbestos cement pipelines constitute a significant portion of the potable and waste water systems in many countries in the world, including Australia. Most of the asbestos cement pipes in the developed countries were installed before 1980, and many utilities are observing that the breakage rate is increasing with the ageing of the pipe. Condition assessment for asbestos cement pipes is of important necessity for prioritising rehabilitation and preventing catastrophic pipe failure however, few techniques are available for direct assessment of the condition of asbestos cement pipes and most of them are localised and destructive. This article outlines a pilot field study of the non-invasive and non-destructive condition assessment of asbestos cement pipelines using fluid transient pressure waves. Fluid transient analysis previously conducted by the authors for metallic pipelines is further developed and adapted to asbestos cement pipes for the detection of localised defects. A new sub-sectional condition assessment technique is proposed for determining the effective wall thicknesses of asbestos cement sub-sections within a section of pipe bounded by two measurement points. A field trial is conducted in Australia on an asbestos cement water main (which has class changes with varying wall thicknesses) to verify the proposed techniques. The wave speeds, lengths and wall thicknesses of sub-sections in different classes are determined and the results are consistent with the information in the design drawings provided by the water utility. This field study, for the first time, verifies that controlled fluid transient waves can be used as a tool for non-invasive and non-destructive condition assessment of asbestos cement pipelines.
Publisher: American Society of Civil Engineers
Date: 17-05-2012
Publisher: American Society of Civil Engineers (ASCE)
Date: 08-2022
Publisher: Springer Science and Business Media LLC
Date: 09-06-2017
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2022
Publisher: Informa UK Limited
Date: 11-12-2015
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2013
Publisher: American Society of Civil Engineers (ASCE)
Date: 08-2020
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 07-2023
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2018
Publisher: IWA Publishing
Date: 02-2018
Abstract: Fault detection in water distribution systems is of critical importance for water authorities to maintain pipeline assets effectively. This paper develops an improved inverse transient analysis (ITA) method for the condition assessment of water transmission pipelines. For long transmission pipelines ITA approaches involve models using hundreds of discretized pipe reaches (therefore hundreds of model parameters). As such, these methods struggle to accurately and uniquely determine the many parameter values, despite achieving a very good fit between the model predictions and measured pressure responses. In order to improve the parameter estimation accuracy of ITA applied to these high dimensional problems, a multi-stage parameter-constraining ITA approach for pipeline condition assessment is proposed. The proposed algorithm involves the staged constraining of the parameter search-space to focus the inverse analysis on pipeline sections that have a higher likelihood of being in an anomalous state. The proposed method is verified by numerical simulations, where the results confirm that the parameters estimated by the proposed method are more accurate than the conventional ITA. The proposed method is also verified by a field case study. Results show that anomalies detected by the proposed methods are generally consistent with anomalies detected by ultrasonic measurement of pipe wall thickness.
Publisher: Informa UK Limited
Date: 20-11-2017
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2018
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2016
Publisher: Elsevier BV
Date: 10-2018
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2023
Publisher: SAGE Publications
Date: 09-2015
Abstract: Pipeline condition assessment is essential for targeted and cost-effective maintenance of aging water transmission and distribution systems. This article proposes a technique for fast and non-invasive assessment of the wall condition of cement mortar–lined metallic pipelines using fluid transient pressure waves (water hammer waves). A step transient pressure wave can be generated by shutting off a side-discharge valve in a pressurised pipeline. The wave propagates along the pipe and reflections occur when it encounters sections of pipe with changes in wall thickness. The wave reflections can be measured by pressure transducers as they are indicative of the location and severity of the wall deterioration. A numerical analysis is conducted to obtain the relationship between the degree of change in wall thickness in a cement mortar–lined pipe and the size of the corresponding pressure wave reflection. As a result, look-up charts are generated for any specific cement mortar–lined pipeline to map this relationship. The wall thickness of a deteriorated or distinct section can be determined directly and quickly from the charts using the size of the reflected wave, thus facilitating on-site pipeline condition assessment. The validity of this time-domain pipeline condition assessment technique is verified by numerical simulations and a case study using the field data measured in a mild steel cement mortar–lined water main in South Australia. The condition of the pipe as assessed by the proposed technique is generally consistent with ultrasonic measurements.
Publisher: IOP Publishing
Date: 27-03-2019
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2018
Publisher: IWA Publishing
Date: 12-02-2019
Abstract: The use of two pressure transducers in close proximity can enable the separation of the directional travelling pressure waves in pipelines. However, the implementation of this measurement strategy in real water pipes is difficult due to the lack of closely located access points. This paper reports the use of a customised in-pipe fibre optic pressure sensor array for hydraulic transient wave separation and pipeline condition assessment. The fibre optic pressure sensor array can be inserted into a pressurised pipeline through a single access point. The array consists of multiple fibre Bragg grating (FBG)-based pressure sensors in close proximity (∼0.5 m apart). A previously developed wave separation algorithm is adapted to analyse the transient pressure measurement from the FBG sensors. The resultant directional pressure waves are then used to detect pipe sections with a thinner wall thickness. A challenge is the influence of the in-pipe fibre optic sensing cable on the transient pressure measurement. The impact is analysed and adjustments to the pipeline condition assessment algorithm are undertaken to resolve the issue. The successful experimental application verifies the usefulness of the in-pipe fibre optic sensor array, which can facilitate transient-based pipeline condition assessment for buried water pipes with limited access points.
Publisher: World Scientific Pub Co Pte Ltd
Date: 04-2018
DOI: 10.1142/S0218348X1840011X
Abstract: A new technique is proposed for signal-noise identification and targeted de-noising of Magnetotelluric (MT) signals. This method is based on fractal-entropy and clustering algorithm, which automatically identifies signal sections corrupted by common interference (square, triangle and pulse waves), enabling targeted de-noising and preventing the loss of useful information in filtering. To implement the technique, four characteristic parameters — fractal box dimension (FBD), higuchi fractal dimension (HFD), fuzzy entropy (FuEn) and approximate entropy (ApEn) — are extracted from MT time-series. The fuzzy c-means (FCM) clustering technique is used to analyze the characteristic parameters and automatically distinguish signals with strong interference from the rest. The wavelet threshold (WT) de-noising method is used only to suppress the identified strong interference in selected signal sections. The technique is validated through signal s les with known interference, before being applied to a set of field measured MT/Audio Magnetotelluric (AMT) data. Compared with the conventional de-noising strategy that blindly applies the filter to the overall dataset, the proposed method can automatically identify and purposefully suppress the intermittent interference in the MT/AMT signal. The resulted apparent resistivity-phase curve is more continuous and smooth, and the slow-change trend in the low-frequency range is more precisely reserved. Moreover, the characteristic of the target-filtered MT/AMT signal is close to the essential characteristic of the natural field, and the result more accurately reflects the inherent electrical structure information of the measured site.
Publisher: Springer Science and Business Media LLC
Date: 31-05-2020
Publisher: American Society of Civil Engineers (ASCE)
Date: 2014
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2020
Publisher: Elsevier BV
Date: 2015
Publisher: MDPI AG
Date: 10-01-2019
DOI: 10.3390/W11010118
Abstract: The classic orifice equation is commonly used to calculate the leakage and intrusion rate for pressurized pipelines with cracks on the pipe wall. The conventional orifice equation does not consider the effect of the flow velocity in the main pipe, and there is a lack of studies on this matter. For this technical note, the influence of the main pipe flow velocity on the outflow and inflow through a crack on the pipe wall was studied in the laboratory. The experimental results show that the impact of the main pipe flow velocity can be significant. When the pressure difference across the orifice was constant, with the increase of the main pipe flow velocity, the outflow velocity increased, but the contraction area of the jet and the outflow discharge coefficient decreased. By comparing orifices with different shapes, it was found that the discharge from the circumferential crack was most sensitive to the main pipe flow velocity. In addition, the main pipe flow promoted the orifice inflow. When the pressure difference across the orifice was constant, with the increase of the main pipe flow velocity, the inflow discharge coefficient increased, which is the opposite pattern to that of the orifice outflow.
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2021
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2019
Publisher: IWA Publishing
Date: 18-07-2017
Abstract: Over the past two decades, techniques have been developed for pipeline leak detection and condition assessment using hydraulic transient waves (i.e. water hammer waves). A common measurement strategy for applications involves analysis of signals from a single pressure sensor located at each measurement site. The measured pressure trace from a single sensor is a superposition of reflections coming from upstream, and downstream, of the sensor. This superposition brings complexities for signal processing applications for fault detection analysis. This paper presents a wave separation algorithm, accounting for transmission dynamics, which enables the extraction of directional travelling waves by using two closely placed pressure sensors at one measurement site (referred to as a dual-sensor). Two typical transient incident pressure waves, a pulse wave and a step wave, are investigated in numerical simulations and laboratory experiments. Comparison of the wave separation results with their predicted counterparts shows the wave separation algorithm is successful. The results also show that the proposed wave separation technique facilitates transient-based pipeline condition assessment.
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2019
Publisher: American Society of Civil Engineers (ASCE)
Date: 2023
Publisher: American Society of Civil Engineers (ASCE)
Date: 2023
Publisher: Informa UK Limited
Date: 27-07-2017
Publisher: Informa UK Limited
Date: 02-09-2013
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2023
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2013
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2018
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2020
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2014
Publisher: Elsevier BV
Date: 2018
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2020
Publisher: Informa UK Limited
Date: 20-10-2020
Location: Australia
Start Date: 2023
End Date: 12-2025
Amount: $390,945.00
Funder: Australian Research Council
View Funded ActivityStart Date: 05-2023
End Date: 04-2026
Amount: $368,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 04-2021
End Date: 04-2024
Amount: $447,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 08-2019
End Date: 06-2023
Amount: $395,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 04-2019
End Date: 06-2023
Amount: $479,000.00
Funder: Australian Research Council
View Funded Activity