Dylan James Irvine

Dylan James Irvine
Charles Darwin University | CDU · Research Institute for the Environment and Livelihoods

B Ed, B Env Sci, PhD Hydrogeology

About

65
Publications
14,583
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
862
Citations
Citations since 2016
54 Research Items
817 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Introduction
I am interested in groundwater-surface water interactions, the influence of aquifer/streambed heterogeneity on transport processes, thermal transport and numerical modelling. I'm particularly interested in the use of streambed temperature as a tracer to determine groundwater-surface water interaction. In recent years, I've become quite keen on use of the Python programming language, and hope to extend my Python library of heat related functions for quantifying groundwater fluxes.
Additional affiliations
January 2020 - present
Flinders University
Position
  • Professor (Associate)
Description
  • Teach Physical Hydrogeology, Contaminant and Tracer Hydrology, Problem Solving with Computers, and teaching in WIL. Research focuses on tracers, springs, impact of mining, coastal hydrogeology, and groundwater-surface water interactions.
January 2017 - January 2020
Flinders University
Position
  • Lecturer
Description
  • Lecturer in hydrogeology. Teaching: Physical Hydrogeology, Contaminant & Tracer Hydrology, Problem Solving with Computers. Research into heat as a tracer, groundwater management, coastal hydrogeology, amongst other areas.
September 2014 - December 2016
Monash University (Australia)
Position
  • Research Associate

Publications

Publications (65)
Article
Heat is a powerful tracer to quantify fluid exchange between surface water and groundwater. Temperature time series can be used to estimate pore water fluid flux, and techniques can be employed to extend these estimates to produce detailed plan-view flux maps. Key advantages of heat tracing include cost-effective sensors and ease of data collection...
Article
Groundwater flow induces advective heat transfer, and thus the deviation of subsurface temperatures from an expected conduction-dominated regime can be analyzed to estimate vertical water fluxes. A number of analytical approaches have been proposed for using heat as a tracer, and these have typically assumed a homogeneous medium; however heterogene...
Article
Obtaining reliable estimates of vertical groundwater flows remains a challenge but is of critical importance to the management of groundwater resources. When large scale land clearing or groundwater extraction occurs, methods based on water table fluctuations or water chemistry are unreliable. As an alternative, a number of methods based on tempera...
Article
Full-text available
This study details the derivation and application of a new analytical solution to the one-dimensional, transient conduction-advection equation that is applied to trace vertical subsurface fluid fluxes. The solution employs a flexible initial condition that allows for non-linear temperature-depth profiles, providing a key improvement over most previ...
Article
Full-text available
Steady state 1D analytical solutions to estimate groundwater fluxes from temperature profiles are an attractive option because they are simple to apply, with no complex boundary or initial conditions. Steady state solutions have been applied to estimate both aquifer scale fluxes as well as to estimate groundwater discharge to streams. This study ex...
Article
Study region Australia Study focus Our incomplete knowledge of groundwater systems and processes imposes barriers in attempting to manage groundwater sustainably. Challenges also arise through complex institutional arrangements and decision-making processes, and the difficulty in involving stakeholders. In some areas, these difficulties have led t...
Article
Full-text available
Adaptive management (AM) uses targeted monitoring, and structured and iterative integration of new knowledge of project operations to improve future management practices. AM is increasingly cited in groundwater management plans because it purportedly overcomes inherent uncertainties in estimating future environmental responses to human activities....
Preprint
Aquifers contain the largest store of unfrozen freshwater, making groundwater critical for life on Earth. Groundwater temperatures infl uence stream thermal regimes, groundwater-dependent ecosystems, aquatic biogeochemical processes, water quality, and the geothermal potential. Yet little is known about how groundwater responds to surface warming a...
Article
Full-text available
Streams and rivers of the Australian tropics have been the subject of substantial hydrological process research spanning the last 50 years. In this review, we highlight initial efforts to understand the hydrological response of forested ecosystems in the humid tropics, and how this has been more recently followed by work in savannas of the seasonal...
Article
Full-text available
The current theory for defining the occurrence of riparian lenses (i.e., buoyant, lenticular‐shaped fresh groundwater bodies overlying saline groundwater in riparian zones) is largely based on steady‐state analyses, which neglect the transient dynamics expected in real‐world settings. In this study, the transience of riparian lens movement is inves...
Article
Full-text available
Aquifer storage and recovery (ASR) involves the injection, and later extraction, of freshwater into aquifers, which often contain saline groundwater. Mixing between the fresh injectant and native saltwater often leads to part of the injectant becoming unrecoverable, thereby impacting ASR performance. This study explores freshwater‐saltwater mixing...
Article
Full-text available
Springs sustain groundwater-dependent ecosystems and provide freshwater for human use. Springs often occur because faults modify groundwater flow pathways leading to discharge from aquifers with sufficiently high pressure. This study reviews the key characteristics and physical processes, field investigation techniques, modelling approaches and man...
Article
The chloride mass balance (CMB) method is widely used to estimate long-term rates of groundwater recharge. In regions where surface water runoff is negligible, recharge can be estimated using measurements of chloride concentrations of groundwater and precipitation, and an estimate of long-term average rainfall. This paper presents the Chloride Mass...
Article
Full-text available
Carbon-14 (14C) is routinely used to determine mean residence times (MRTs) of groundwater. 14C-based MRT calculations typically assume that the unsaturated zone is in equilibrium with the atmosphere, controlling the input 14C activity. However, multiple studies have shown that unsaturated zone 14C activities are lower than atmospheric values. Despi...
Article
Hydraulic head distributions can inform spring source-water characterisation by determining whether aquifers meet the thresholds required to sustain spring flow. Assessing hydraulic head data can be challenging in areas where data are sparsely distributed and subject to variable measurement uncertainty. Geostatistical methods can be used to estimat...
Preprint
Full-text available
Carbon-14 (14C) is routinely used to determine mean residence times (MRTs) of groundwater. 14C-based MRT calculations typically assume that the unsaturated zone is in equilibrium with the atmosphere, controlling the input 14C activity. However, multiple studies have shown that unsaturated zone 14C activities are lower than atmospheric values. Despi...
Article
Full-text available
The dependence of near-shore ecosystems on the freshwater component of submarine groundwater discharge (SFGD) is well recognized. Previous studies of SFGD have typically assumed that SFGD occurs through aquitards that are in direct contact with seawater. These studies provide no guidance on the distribution of freshwater discharge to the seafloor w...
Article
Observations of tidal propagation in coastal aquifers allow for rapid, low-cost quantification of aquifer parameters that are integrated over significant distances. Previous methods for aquifer property estimation from tidal propagation have focussed on continental aquifers and assumed straight, infinite shorelines. A recent investigation has propo...
Article
Flow within offshore aquifers is important for the management of fresh groundwater in coastal zones. Alongshore head gradients have been observed in many coastal aquifers; however, this process is typically neglected, and offshore aquifers are primarily assessed using cross-sectional representations. This study explores offshore implications of alo...
Article
Full-text available
Heat has been widely applied to trace groundwater‐surface water exchanges in inland environments, but it is infrequently applied in coastal sediment where head oscillations induce periodicity in water flux magnitude/direction and heat advection. This complicates interpretation of temperatures to estimate water fluxes. We investigate the convolution...
Article
Full-text available
State and federal governments in Australia recently approved water management plans for one of the largest coal mines ever proposed. This comes as the role of coal in the world’s future energy mix is being seriously questioned, and global concern over the climate and water implications of further fossil fuel development. Despite repeated advice fro...
Article
This article outlines analytical solutions to quantify the length scale associated with “upstream dispersion”, the artificial movement of solutes in the opposite direction to groundwater flow, in solute transport models. Upstream dispersion is an unwanted artefact in common applications of the advection‐dispersion equation (ADE) in problems involvi...
Article
Determining mean transit times in headwater catchments is critical for understanding catchment functioning and understanding their responses to changes in landuse or climate. Determining whether mean transit times (MTTs) correlate with drainage density, slope angle, area, or land cover permits a better understanding of the controls on water flow th...
Article
The temporary storage of river water in riverbanks and its subsequent return to the river is an important part of the hydrological cycle. Detailed multi-year head and electrical conductivity (EC) variations document the spatial and temporal scales of bank infiltration and return flows in the Ovens catchment, southeast Australia. The study represent...
Article
Adaptive management (AM) is an approach that uses targeted monitoring and investigation to improve future management practices in a structured and iterative way through reassessment of the efficacy of management policies and system understanding. AM has received significant attention in groundwater management for its purported capability to counter...
Article
Upward discharge to surface water bodies can be quantified using analytical models based on temperature‐depth (T‐z) profiles. The use of sediment T‐z profiles is attractive as discharge estimates can be obtained using point‐in‐time data that are collected inexpensively and rapidly. Previous studies have identified that T‐z methods can only be appli...
Article
Offshore fresh groundwater is increasingly suggested as a potential water resource for onshore human demands. In many cases, onshore pumping already draws significant fresh groundwater from offshore. However, offshore aquifers and the extent of offshore freshwater are usually poorly characterised due to data scarcity. This study combines geophysica...
Article
This opinion article addresses the reluctant acceptance and application of heat as a standard groundwater tracer in hydrogeologic practice. This article is protected by copyright. All rights reserved.
Article
Recent recognition of the widespread occurrence of freshwater beneath the ocean has renewed interest in approaches to understand and predict its extent. The most straightforward methodologies are based on the sharp-interface approximation, which neglects dispersive mechanisms. The understanding of dispersion effects on freshwater extents in coastal...
Article
Full-text available
Quantifying groundwater fluxes to and from deep aquifers or shallow sediment is a critical task faced by researchers and practitioners from many environmental science disciplines including hydrology, hydrogeology, ecology, climatology, and oceanography. Groundwater discharge to inland and coastal water bodies influences their water budgets, thermal...
Article
Submarine groundwater fluxes across the seafloor facilitate important hydrological and biogeochemical exchanges between oceans and seabed sediment, yet few studies have investigated spatially distributed groundwater fluxes in deep-ocean environments such as continental slopes. Heat has been previously applied as a submarine groundwater tracer using...
Article
Streams strongly influenced by groundwater discharge may serve as "climate refugia" for sensitive species in regions of increasingly marginal thermal conditions. The main goal of this study is to develop paired air and stream water annual temperature signal analysis techniques to elucidate the relative groundwater contribution to stream water and t...
Article
The term “convection” is commonplace in groundwater science. The transport equation that we routinely use is sometimes called the “Convection‐Dispersion Equation”. The term convection also often arises in connection with variable density groundwater flow processes, where groundwater flow is driven by buoyancy differences in fluid, created by differ...
Article
Estimating the time required for water to travel through headwater catchments from where it recharges to where it discharges into streams (the transit time) is important for understanding catchment behaviour. This study uses tritium (³H) activities of stream water to estimate the mean transit times of water in the upper Latrobe and Yarra catchments...
Article
Full-text available
The presence of unsaturated zones at the river-aquifer interface has large implications on numerous hydraulic and chemical processes. However, the hydrological and geological controls that influence the development of unsaturated zones have so far only been analyzed with simplified conceptualizations of flow processes, or homogeneous conceptualizat...
Code
This is the supporting information for the Hydrological Processes paper by the same title. It contains the Flux-LM tool, which is a macro-enabled spreadsheet. Instructions on using the model are provided in the worksheet entitled “Introduction”. Hyperlinked cells allow the user to quickly navigate through the various worksheets.
Article
Analytical solutions that use diurnal temperature signals to estimate vertical fluxes between groundwater and surface water based on either amplitude ratios (Ar) or phase shifts (Δϕ) produce results that rarely agree. Analytical solutions that simultaneously utilize Ar and Δϕ within a single solution have more recently been derived, decreasing unce...
Article
Groundwater-surface water interactions in rivers are a critically important factor for fish spawning, as streamwater downwelling or upwelling of low-oxygen groundwater can affect egg survival. Assessing such dynamics at the reach scale using distributed temperature measurements as a tracer proved reliable in determining flux rates and directions in...
Conference Paper
Full-text available
Temperature is a powerful tracer to estimate vertical flows in the hyporheic zone. Temperature time series can be used to obtain estimates of fluid flux, and techniques can be employed to extend these estimates into plan-view flux maps. Key advantages of the use of heat as a tracer include that sensors are inexpensive, and that data can be collecte...
Conference Paper
Obtaining estimates of vertical groundwater flows remains a challenge in hydrogeology. A number of methods based on temperature-depth ( T-z) profiles are available to provide vertical groundwater flow estimates. However, methods based on steady state assumptions have been shown to be inappropriate for sites that have experienced land surface warmin...
Article
Full-text available
Vertical fluid exchange between surface water and groundwater can be estimated using diurnal signals from temperature time series methods based on amplitude ratios (A r), phase shifts (∆φ), or combined use of both (A r ∆φ). The A r , ∆φ, and A r ∆φ methods are typically applied in conditions where one or more of their underlying assumptions are vio...
Article
Analytical solutions to the 1D heat transport equation can be used to derive point measurements of flux between surface water and groundwater from streambed temperature time series. Recent studies have used empirical relationships between measured flux and pointin-time observations of streambed temperatures to produce detailed plan view maps of flu...
Data
heatfuncs.py is a library of functions which can be used with the Python programming language to determine groundwater flow from groundwater temperature data. The functions are accompanied by a user's guide which details the approaches included in heatfuncs.py, how the functions work, and provides detailed examples of how the functions can be calle...
Data
A user guide for a library of Python functions to calculate groundwater flow from temperature data. Current version (v0.0.1) includes analytical solutions by Bredehoeft and Papadopulos (1965), Mansure and Reiter (1979) and Lu and Ge (1996). This user guide explains the analytical solutions, provides a description of loading data and how to run func...
Article
One-dimensional analytical heat transport equations based on temperature time series data have become popular tools to quantify groundwater-surface water interactions. The influence of nonideal field conditions on the use of these equations has been assessed for nonsinusoidal stream temperature signals, uncertainty in thermal parameters, sensor acc...
Article
Full-text available
The potential for thermal convection in aquifers is strongly influenced by permeability. Permeability is highly heterogeneous within aquifers, and spatial distributions of permeability are rarely well constrained by measurements, making it difficult to determine the potential for thermal convection in a given aquifer. In this study, this difficulty...
Article
Full-text available
A comparison of groundwater velocity in heterogeneous aquifers estimated from hydraulic methods, heat and solute tracers was made using numerical simulations. Aquifer heterogeneity was described by geostatistical properties of the Borden, Cape Cod, North Bay, and MADE aquifers. Both heat and solute tracers displayed little systematic under- or over...
Article
Decline in regional water tables (RWT) can cause losing streams to disconnect from underlying aquifers. When this occurs, an inverted water table (IWT) will develop beneath the stream, and an unsaturated zone will be present between the IWT and the RWT. The IWT marks the base of the saturated zone beneath the stream. Although a few prior studies ha...
Article
A common approach in modeling surface water-groundwater interaction is to represent the streambed as a homogeneous geological structure with hydraulic properties obtained by means of model calibration. In reality, streambeds are highly heterogeneous, and there are currently no methodical investigations to justify the simplification of this geologic...

Questions

Question (1)
Question
Hi all
I'm making a map of all of the locations where either VFLUX, or on the odd chance that anyone is using FLUX-LM (Kurylyk et al. 2017, HP) is being used.
If you're using either of these tools, please let me know!
Many thanks,
-Dylan

Network

Cited By