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Graduate Student Supervision
Doctoral Student Supervision (Jan 2008 - Nov 2019)
Alluvial fans, conic depositional landforms that develop where headwater streams outlet into a main valley, are desirable locations for development in mountainous regions worldwide. Alluvial fans may become hazardous during high flow events; the relatively high gradient and the abundance of loosely packed sediment allows alluvial fan channels to undergo rapid morphodynamic change, putting bordering infrastructure at great risk. Despite these hazards, our understanding of channel dynamics on alluvial fans remains limited. Through physical modelling, this thesis investigates the processes contributing to channel stability in such environments. Using three sets of paired experiments, I show that channel stability is mediated by the mobility of the largest grains in the channel. Pairs of experiments were identical in all regards (i.e. discharge, sediment supply, gradient, median grain size), the only difference was a slight increase in the proportion of large grains found in the bed material, while the median sediment size for the experimental pairs remained essentially the same. Overall, I found that channels with bed material containing fewer large grains experienced two to four times as much erosion and deposition across a range of discharges and rates of sediment supply. These findings contradict the conventional models of channel stability, that use the median grain size to represent the bed surface; these models commonly assume that streams undergo morphodynamic change once that grain size is mobile. My experiments demonstrate that channel stability is linked to the mobility of the largest grains, not the median size. Using high resolution models of the bed surface, I show that the channels containing the greater proportion of large grains tend to be more stable due to their increased frequency at the bed surface. Based on these results, I propose a three phase model of channel stability wherein the thresholds between stable/dynamically stable and dynamically stable/unstable are governed by the thresholds of entrainment and full mobility of the largest grains, respectively. This new model of channel stability could improve our capacity to predict when catastrophic events may occur in steep, alluvial channels.
No abstract available.
No abstract available.
Laboratory physical models have been used in geomorphology for over a century. Physical models are a useful tool for understanding and observing phenomenon that are difficult or impossible to observe in the field. The objective of this study was to understand the long-term evolution of a semi-alluvial channel in terms of its morphology and sediment transport under various scenarios of constant sediment supply and discharge. Specifically, the research aimed to investigate (1) effects of various flows and sediment feed rates on surface textures and sediment output, (2) relationship between channel storage, and the (3) morphology and sediment transport sediment transport processes and pathways. These objectives were addressed by building a Froude scaled physical model based on the irregular meandering planform of Fishtrap Creek, and conducting ten experiments of varying temporal lengths, discharge and feed rates. The model successfully replicated pool-riffle and plane-bed morphologies. The effects on the characteristics of the bed surface and transported sediment under differing regimes of discharge and sediment feed were investigated. Scaled formative flows ranging from 2-yr to over 150-yr return period events were employed. The results indicated that even with discharges exceeding the 10-yr event, full mobility was not observed. This slight but persistent size-selectivity produced long-term aggradation and surface coarsening.The effects of varying sediment supply and discharge in channel storage and morphology were explored. Results showed that sediment transport rates varied both spatially and temporally. The variability was more dependent upon changes in channel morphology than adjustments in the grain size distribution of the surface. Cycles of aggradation-degradation were observed to occur without changes in sediment supply of discharge and that they tended to occur in periods when sediment output approximately equaled sediment feed rates. Lastly, one experiment was selected to describe sediment transport processes and pathways. Primary information regarding sediment pathways was obtained through the observation of bedload sheet movement and migration during the experiments, as well as through subsequent review of videos made during the experiments. The behaviour of bedload sheets also shed new information on how sediment sorting through a pool varies.
Master's Student Supervision (2010 - 2018)
The Waiho River in Westland, New Zealand has been rapidly aggrading its bed as a result of lateral confinement by a stopbank network which restricts the river to 30% of its natural fan accommodation space. The ongoing aggradation has prompted the need to repeatedly raise the crest level of the stopbanks. This had led to the bed and stopbank elevation reaching unpreceded and dangerously high levels, putting the surrounding land, infrastructure and Franz Josef community at even greater risk than before should the stopbanks fail. This thesis investigates an alternative solution to the current management practice. Using a microscale model it tests the response of an experimental Waiho River and fan to the removal of the Southern stopbank and replacement with two alternatives which allow the river greater access to its Southern fan surface. In addition, the study allowed for an exploration of several microscale modelling techniques. The results found that an experimental fan in a state of dynamic equilibrium would not aggrade when confined as previously thought. Only when the fan was already aggrading did it continue to aggrade when confined. In this instance, when the confinement was removed it did not result in degradation to lower elevations. Aggradation continued, albeit at a reduced rate. This suggests that the Waiho was already in a state of aggradation prior to human interference, and that confinement exacerbated the rate. This result has implications for the future management of the Waiho. If the current aggradation trend is to continue, then increasing stopbank crest height is not a viable solution, however releasing the river to the South will reduce the rate of aggradation as well as the pressures on the Northern stopbanks which protect the Franz Josef township. Effectively, this buys time for more drastic action (i.e. relocation of the township) to be taken. In addition to these results, the experiments found that measurement tools and model materials used previously in other microscale models produced unreliable fan behaviour and results. That they have failed in this study, motivates the need for further investigation into the underlying principles of microscale modelling and its practice.
This thesis presents the results of ten experiments conducted to examine the role grain size distributions play in the behaviour and evolution of one dimensional alluvial fans using a novel flume setup. The two grain size distributions share the same median grain size (D₅₀ = 1.42 mm), one (GSD₁) is composed of log normally distributed material from 0.25 to 5.6 mm and the other (GSD₂) is only composed of two classes: 1.4 and 2.0 mm. Images of the deposit profile and surface were used to monitor the evolution of the deposit and allow for the quantitative and qualitative assessment of behaviour, respectively. A detailed comparison of the aggrading phase of one run condition (Q = 0.1 l/s, Qb = 1 g/s) demonstrates a difference in the morphology that must originate from the grain size distribution. The addition of coarser grains in GSD₁ creates patches of immobility and allows the formation of bars more resistant to flow than in GSD₂. This reduction in transport efficiency of the material results in a higher slope and more stable bed configuration for GSD₁. More widely, this pair of experiments shows that differences in mobility may still manifest in aggrading environments. For all five pairs of experiments this difference is present. Overall, GSD₁ exhibits more stable behaviour: lower transport rates, higher slopes and later transport than GSD₂. However, the difference between the two grain size distributions decreases as discharge increases. That is, the difference is most pronounced at the lowest discharge where grains are less mobile due to the lower maximum stress and lower frequency of it occurring. This reduced mobility is due to a threshold of entrainment present in GSD₁ that is less commonly exceeded at low discharges, but that is not present to the same extent in GSD₂. Therefore, the proportion of immobile grains controls the behaviour and stability of an aggrading channel.
Considerable effort has been dedicated to restoring sturgeon habitat within dammed rivers. However, sedimentation causes long-term failure because interstitial voids provide critical habitat during early life-stages. Based on the premise that a better understanding of geomorphic processes will improve restoration design, this study characterizes flow and sediment transport dynamics through a white sturgeon spawning reach on the Nechako River, BC.An extensive dataset was collected throughout the 2015 flood. Bedload transport was sampled on 36 days with flows ranging from 44 m³/s to 656 m³/s. During a high flow of 525 m³/s, channel bathymetry and water surface elevation were surveyed and velocity profiles were collected across 9 transects. Banklines, bars and island topography were later surveyed during low flow.Sediment transport into the reach was positively related with discharge. This relation was non-linear and transport rates increased rapidly once flows exceeded 400 m³/s. The relation weakened with downstream distance and sediment transport peaked progressively later throughout the year. No relation was observed at the downstream end of the reach, where transport rates remained low and constant relative to upstream.Sediment was primarily transported through secondary channels conveying a disproportionate amount of sediment compared to flow. Within the single-thread channel, the locations conveying the greatest amount of sediment remained spatially consistent over time.Hydrodynamic modelling indicates the Burrard Ave. Bridge causes backwatering once discharge exceed 225-275 m³/s. Velocity, shear stress and transport capacity at the downstream end of the reach do not increase with discharge because of the backwatering and the expansion in channel width through the island complex. The locations of maximum shear stress and transport capacity shift upstream with increasing discharge, but shear stress does not exceed 23 N/m² for flows up to 775 m³/s.The fluvial dynamics within the spawning reach create challenges and opportunities for habitat restoration. Backwatering is problematic because it causes mid-reach deposition during high flows and limits shear stress magnitude over the downstream spawning substrate. Meanwhile, the presence of sediment transport pathways through secondary channels and within the mainstem can be used to site restoration projects in areas apt to maintain suitable habitat.
This study examines the short-term physical habitat conditions at four sites on the Kananaskis River, Alberta, where a hydropeaking dam was installed in 1955. This dam imposes both the approximate pre-dam minimum flow, and the pre-dam flood (from a small flood year) on a daily basis. The purpose of this study was to examine the extent of daily changes in physical habitat conditions that organisms in the stream would have to endure, and the extent to which these fluctuations might be reduced downstream due to distance from the dam and unregulated tributary influence. Physical habitat conditions monitored over low flow and high flow dam releases were: velocity; depth; bed mobility; ramping rates; and total suspended solids. River2D was used to calculate weighted usable area and potential habitat for Brown Trout (fry, juveniles and adults) and Mountain Whitefish (fry, juveniles and adults) at the low and high flow conditions. Of the factors examined, only ramping rates and total suspended solids showed signs of downstream attenuation. Differences in depth, velocity, weighted usable area, and potential habitat between low flow and high flow dam releases were variable, and showed no downstream pattern. Between low and high flow releases, significant (p = 0.05) changes in depth were observed at all sites, and significant changes (p = 0.05) in velocity were observed at all but the second site. The second site also saw the smallest changes in measures of habitat between low flow and high flow dam releases; however, all other sites saw median differences of 48.1% to 170.9%. Percent differences in habitat between low and high flow dam releases ranged from 2.6% (second downstream site, juvenile Brown Trout) to 193.3% (third downstream site, adult Mountain Whitefish). These habitat changes happen more often than before the dam was installed (many times weekly vs. about once a year during the spring freshet) and they occur more rapidly. Because these changes happen at times of the year that are out of synchronization with the biota of the river, and as these changes are extreme, this implies challenging physical habitat conditions for indigenous stream biota.
Within this thesis the results of a set of four stream table experiments are presented in order to examine the role that bed texture adjustments play in the development of a equilibrium channel form in the presence of large wood. Experiments were conducted using two physical models of Fishtrap Creek, an intermediate sized stream in the interior of British Columbia. While both flumes were Froude-scaled models with fixed banks and mobile beds, Model 1 contained a single grain size representative of the D₅₀ of the prototype stream while Model 2 contained a scaled grain size distribution (GSD) of Fishtrap Creek. Two treatments of wood load were run in each model: a moderate wood load (a scale equivalent of 160 m³/m²) and a high wood load (a scale equivalent of 220 m³/m²). Channel morphology was captured at five-hour intervals in order to create DEMs of the evolving bed surface. The results of this study show that bed grain size composition plays a dominant role in shaping channel morphology, even in the presence of large wood. The addition of large wood increased sediment storage which resulted in an increase in reach-averaged bed slope, the magnitude of which was proportional to the wood load added. Large wood also caused new areas of scour and deposition to be imposed onto the channel morphology that had been established prior to the addition of wood, causing an overall decrease in pool spacing and median pool area. The presence of a grain size distribution constrained the range of depth values in the flume as it allowed the bed to self-stabilize by limiting scour depth through the process of armouring. Regardless of the presence of large wood, maximum depths were approximately twice as deep in the single grain size flume and pools were deeper relative to their area. These results highlight the necessity of considering the full grain size distribution when modelling channel response to changes in the governing variables that influence channel morphology.
No abstract available.
The Pocaterra dam on the Kananaskis River provides a unique opportunity to assess dam induced changes in channel morphology because it has caused reduction in the magnitude of high flows and creation of daily peaking flows with no associated alteration in sediment supply. We assessed reach scale morphological change of the Kananaskis as a result of the hydropeaking flow regime considering change in geometry, planform, vegetation, and pool characteristics and distribution. Pre and post-dam channel conditions were assessed through historical photos, field measurements, remote sensing techniques and modeling. The channel just downstream of the dam widened, the middle six sites show no statistical change, and the most downstream three sites showed statistically significant narrowing. Further changes included a shift towards fewer active channels, abandonment of back channels, increase in density of riparian vegetation, and low diversity of successional stages within the riparian forests. A rational regime model reasonably predicted width adjustment and shift in number of active channels. We also found depth distributions to differ from statistical distributions in the most upstream sites with a higher proportion of low depths while the most downstream site matched the statistical distributions. Pool characteristics were associated with local attributes with large pools formed near large wood and back channels and numerous smaller free forming pools. The hydropeaking signal appears to drive channel change in the upper reaches where the models did not correspond to observed channel characteristics while the reduction in peak flows appears to drive channel morphology in the more downstream reaches. The interactions of the hydropeaking flows with winter ice dynamics also appear to control channel change in this system and contribute to the unique morphology. Channel change is likely associated with decrease in the quality and quantity of suitable fish habitat and thus may have driven declines in fish diversity along this river. Despite the complexity of this system, these modeling and remote sensing methods simply and accurately characterize changes on the Kananaskis and thus provide a useful and rapid method to assess morphological change in a disturbed system.
The primary objective of this research is to investigate the relationship between wood load and reach-scale morphodynamics using a model system. Previous re- search has shown that large wood significantly impacts channel dynamics, espe- cially in small and intermediate sized forested streams where wood pieces are similar in length to channel width. Five experiments, each comprised of several five hour runs, were conducted using a stream table with wood loads scaled to 0 m³/m², 0.011 m³/m², 0.016 m³/m², 0.022 m³/m², and 0.028 m³/m². The addition of large wood significantly increased the flow resistance and decreased the reach-averaged velocity in all experiments. These hydraulic changes were associated with decreased sediment transport and increased sediment storage within the reach. Over time, increases in bed and water surface slope compensated for the loss of potential energy to flow resistance and enabled the system to reach a new steady state. The heterogeneity in the spatial distribution of the hydraulic changes – with flow velocity and shear stress decreasing upstream of obstructions and increasing downstream of log steps – increased the facies complexity and pool frequency in the reach at the new steady state, and thereby increased habitat complexity. These results show that wood load is a primary control on channel morphodynamics and the availability of aquatic habitat in intermediate sized streams.
In August 2003, a wildfire burned through Fishtrap Creek Watershed north of Kamloops British Columbia. This high intensity fire killed almost all the trees within the burned area, including 90% of the riparian vegetation in the vicinity of our study site. The fire did not significantly alter the duration or magnitude of the peak flows within this creek, nor did it have substantial effects on the total suspended sediment concentrations. Changes in channel morphology during the first two years after the fire were minor. The first evidence of morphologic adjustment occurred in 2006 when the channel began to widen and develop very distinct channel bars - adopting a characteristically riffle pool morphology by the end of the 2006 freshet. The most dramatic channel reconfiguration occurred during the 2007 freshet, when the channel widened by as much as 15 m in places. Approximately 82% of the total volume of large wood (LW) recruited to the channel following the fire entered the channel as a result of bank erosion, and the majority of the bank erosion occurred during the 2007 flood season. The post-fire wood load in Fishtrap Creek is slightly higher than other disturbed systems, but is comparable to wood load in undisturbed rivers. LW has had significant influence on channel morphology and bed surface texture distribution. The number of LW pieces of wood in the channel is related to the channel morphology, and 80% of the pools are a result of LW. Most of the post-fire wood is suspended above the channel bed and is not currently functioning in the channel as effectively as pre-fire wood. Estimates of net erosion and deposition were made based on Digital Elevation Models (DEMs) and cross-sections located at regular intervals: a comparison of the two methods shows that cross-sectional analysis results in biased estimates of net erosion and deposition in various, identifiable circumstances, while revealing the same general pattern of channel change within the study reach.
Recent Tri-Agency Grants
The following is a selection of grants for which the faculty member was principal investigator or co-investigator. Currently, the list only covers Canadian Tri-Agency grants from years 2013/14-2016/17 and excludes grants from any other agencies.
- Improvement of a quantitative framework for predicting catastrophic steam channel change on steep alluvial fans - Natural Sciences and Engineering Research Council of Canada (NSERC) - Engage Plus Grants (2015/2016)
- Threshold behaviour in sleep alluvial streams: key variables and geohazards - Natural Sciences and Engineering Research Council of Canada (NSERC) - Discovery Grants Program - Individual (2015/2016)
- Development of a quantitative framework for predicting catastrophic stream channel change on steep alluvial fans - Natural Sciences and Engineering Research Council of Canada (NSERC) - Engage Grants Program (2014/2015)
- Developing a physically-based, geomorphic model to evaluate the probability of pipeline exposure at stream crossings - Mathematics of Information Technology and Complex Systems (MITACS) - Networks of Centres of Excellence (NCE) - Internship Funds (2014/2015)
- Reach-scale morphodynamics of gravel bed streams - Natural Sciences and Engineering Research Council of Canada (NSERC) - Discovery Grants Program - Individual (2013/2014)
- NSERC's hyronet: a national research network to promote sustainable hyropower and healthy aquatic ecosystems - Natural Sciences and Engineering Research Council of Canada (NSERC) - Strategic Network Grant (2013/2014)
- Comparing correlative and bioenergetics-based habitat suitability models for drift-feeding fishes (2019)
Freshwater Biology, 64 (9), 1613-1626
- Percentile-based grain size distribution analysis tools (GSDtools)-Estimating confidence limits and hypothesis tests for comparing two samples (2019)
Earth Surface Dynamics, 7 (3), 789-806
- Beyond Regime: A Stochastic Model of Floods, Bank Erosion, and Channel Migration (2018)
Water Resources Research, 54 (9), 6282-6298
- Breaking from the average: Why large grains matter in gravel-bed streams (2018)
Earth Surface Processes and Landforms, 43 (15), 3190-3196
- Assessing erosion hazards due to floods on fans: Physical modeling and application to engineering challenges (2017)
Journal of Hydraulic Engineering, 143 (8)
- Large grains matter: contrasting bed stability and morphodynamics during two nearly identical experiments (2017)
Earth Surface Processes and Landforms, 42 (8), 1287-1295
- Predicting gravel bed river response to environmental change: the strengths and limitations of a regime-based approach (2017)
Earth Surface Processes and Landforms, 42 (6), 994-1008
- At-A-Station Hydraulic Geometry Simulator (2016)
River Research and Applications, 32 (3), 399-410
- Satellite-based remote sensing of running water habitats at large riverscape scales: Tools to analyze habitat heterogeneity for river ecosystem management (2016)
Geomorphology, 253, 353-369
- Hyperspatial Remote Sensing of Channel Reach Morphology and Hydraulic Fish Habitat Using an Unmanned Aerial Vehicle (UAV): A First Assessment in the Context of River Research and Management (2015)
River Research and Applications, 31 (3), 379-391
- Large wood transport and jam formation in a series of flume experiments (2015)
Water Resources Research, 51 (12), 10065-10077
- Simulating riparian disturbance: Reach scale impacts on aquatic habitat in gravel bed streams (2015)
Water Resources Research, 51 (9), 7590-7607
- UAS-based remote sensing of fluvial change following an extreme flood event (2015)
Earth Surface Processes and Landforms, 40 (11), 1464-1476
- The Floods of 1990 and 1996 on Peace River (2014)
The Regulation of Peace River: A Case Study for River Management, 9781118906149, 233-249
- The Future State of Peace River (2014)
The Regulation of Peace River: A Case Study for River Management, 9781118906149, 251-266
- Hydraulic Geometry: Empirical Investigations and Theoretical Approaches (2013)
Treatise on Geomorphology, 9, 313-329
- Modeling channel morphodynamic response to variations in large wood: Implications for stream rehabilitation in degraded watersheds (2013)
Geomorphology, 202, 59-73
- Muted responses of streamflow and suspended sediment flux in a wildfire-affected watershed (2013)
Geomorphology, 202, 128-139
- Scale-dependent interactions between wood and channel dynamics: Modeling jam formation and sediment storage in gravel-bed streams (2013)
Journal of Geophysical Research: Earth Surface, 118 (4), 2500-2508
- Modeling wood dynamics, jam formation, and sediment storage in a gravel-bed stream (2012)
Journal of Geophysical Research F: Earth Surface, 117 (4)
- A rational sediment transport scaling relation based on dimensionless stream power (2011)
Earth Surface Processes and Landforms, 36 (7), 901-910
- Bank vegetation, bank strength, and application of the University of British Columbia regime model to stream restoration (2011)
Geophysical Monograph Series, 194, 475-485
- NSERC's HydroNet: A National Research Network to Promote Sustainable Hydropower and Healthy Aquatic Ecosystems (2011)
Fisheries, 36 (10), 480-488
- Channel patterns: Braided, anabranching, and single-thread (2010)
Geomorphology, 120 (3-4), 353-364
- Forest fire, bank strength and channel instability: The 'unusual' response of Fishtrap Creek, British Columbia (2010)
Earth Surface Processes and Landforms, 35 (10), 1167-1183
- Wildfire, morphologic change and bed material transport at Fishtrap Creek, British Columbia (2010)
Geomorphology, 118 (3-4), 409-424
- Assessing the effect of vegetation-related bank strength on channel morphology and stability in gravel-bed streams using numerical models (2009)
Earth Surface Processes and Landforms, 34 (5), 712-724
- Channel stability in bed load-dominated streams with nonerodible banks: Inferences from experiments in a sinuous flume (2009)
Journal of Geophysical Research: Earth Surface, 114 (1)
- Detecting the timing of morphologic change using stage-discharge regressions: A case study at Fishtrap Creek, British Columbia, Canada (2009)
Canadian Water Resources Journal, 34 (3), 285-300
- Recent canadian research on fluvial sediment transport and morphology, 2003-2007 (2009)
Canadian Water Resources Journal, 34 (2), 149-162
- 18 Sediment storage and transport in coarse bed streams: scale considerations (2007)
Developments in Earth Surface Processes, 11, 473-496
- Predicting downstream hydraulic geometry: A test of rational regime theory (2007)
Journal of Geophysical Research: Earth Surface, 112 (3)
- A conceptual model for meander initiation in bedload-dominated streams (2006)
Earth Surface Processes and Landforms, 31 (7), 875-891
- Bank stability analysis for regime models of vegetated gravel bed rivers (2006)
Earth Surface Processes and Landforms, 31 (11), 1438-1444
- Optimal alluvial channel width under a bank stability constraint (2004)
Geomorphology, 62 (1-2), 35-45
- Rational regime model of alluvial channel morphology and response (2004)
Earth Surface Processes and Landforms, 29 (4), 511-529
- Scaling and regionalization of flood flows in British Columbia, Canada (2002)
Hydrological Processes, 16 (16), 3245-3263
- Effects of large floods on sediment transport and reach morphology in the cobble-bed Sainte Marguerite River (2001)
Geomorphology, 40 (3-4), 291-309
- Modelling the probability of salmonid egg pocket scour due to floods (2000)
Canadian Journal of Fisheries and Aquatic Sciences, 57 (6), 1120-1130