Kieran B. J. Dunne
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View article: Mercury stocks in discontinuous permafrost and their mobilization by river migration in the Yukon River Basin
Mercury stocks in discontinuous permafrost and their mobilization by river migration in the Yukon River Basin Open
Rapid warming in the Arctic threatens to destabilize mercury (Hg) deposits contained within soils in permafrost regions. Yet current estimates of the amount of Hg in permafrost vary by ∼4 times. Moreover, how Hg will be released to the env…
View article: Geomorphic risk maps for river migration using probabilistic modeling – a framework
Geomorphic risk maps for river migration using probabilistic modeling – a framework Open
Lateral migration of meandering rivers poses erosional risks to human settlements, roads, and infrastructure in alluvial floodplains. While there is a large body of scientific literature on the dominant mechanisms driving river migration, …
View article: Flocculation characteristics of suspended Mississippi River mud under variable turbulence, water and salt sources, and salinity: a laboratory study
Flocculation characteristics of suspended Mississippi River mud under variable turbulence, water and salt sources, and salinity: a laboratory study Open
Muddy sediment constitutes a major fraction of the suspended sediment mass carried by the Mississippi River. Thus, adequate knowledge of the transport dynamics of suspended mud in this region is critical in devising efficient management pl…
View article: Hydrodynamically‐Driven Deposition of Mud in River Systems
Hydrodynamically‐Driven Deposition of Mud in River Systems Open
The riverine transport and deposition of mud is the primary agent of landscape construction and evolution in many fluvial and coastal environments. Previous efforts exploring this process have raised uncertainty regarding the effects of hy…
View article: Comment on egusphere-2023-2190
Comment on egusphere-2023-2190 Open
Abstract. Lateral migration of meandering rivers poses erosional risks to human settlements, roads, and infrastructure in alluvial floodplains. While there is a large body of scientific literature on the dominant mechanisms driving river m…
View article: Geomorphic risk maps for river migration using probabilistic modeling – a framework
Geomorphic risk maps for river migration using probabilistic modeling – a framework Open
Lateral migration of meandering rivers poses erosional risks to human settlements, roads, and infrastructure in alluvial floodplains. While there is a large body of scientific literature on the dominant mechanisms driving river migration, …
View article: The Flocculation State of Mud in the Lowermost Freshwater Reaches of the Mississippi River: Spatial Distribution of Sizes, Seasonal Changes, and Their Impact on Vertical Concentration Profiles
The Flocculation State of Mud in the Lowermost Freshwater Reaches of the Mississippi River: Spatial Distribution of Sizes, Seasonal Changes, and Their Impact on Vertical Concentration Profiles Open
We use in situ measurements of suspended mud to assess the flocculation state of the lowermost freshwater reaches of the Mississippi River. The goal of the study was to assess the flocculation state of the mud in the absence of seawater, t…
View article: Sediment Entrainment and Slump Blocks Limit Permafrost Riverbank Erosion
Sediment Entrainment and Slump Blocks Limit Permafrost Riverbank Erosion Open
Climatic warming and permafrost thaw are predicted to increase Arctic riverbank erosion, threatening communities and accelerating sediment, carbon and nutrient cycling between rivers and floodplains. Existing theory assumes that pore‐ice t…
View article: Suspended particle and floc sizes in the lower most reaches of the Mississippi River during summer 2020 and winter 2021
Suspended particle and floc sizes in the lower most reaches of the Mississippi River during summer 2020 and winter 2021 Open
Data associated with the paper: Osborn, R., Dunne, K. B. J., Ashley, T., Nittrouer, J. A., & Strom, K. (2023). The flocculation state of mud in the lowermost freshwater reaches of the Mississippi River: Spatial distribution of sizes, seaso…
View article: Suspended particle and floc sizes in the lower most reaches of the Mississippi River during summer 2020 and winter 2021
Suspended particle and floc sizes in the lower most reaches of the Mississippi River during summer 2020 and winter 2021 Open
Data associated with the paper: Osborn, R., Dunne, K. B. J., Ashley, T., Nittrouer, J. A., & Strom, K. (2023). The flocculation state of mud in the lowermost freshwater reaches of the Mississippi River: Spatial distribution of sizes, seaso…
View article: Generating risk maps for river migration using probabilistic modeling
Generating risk maps for river migration using probabilistic modeling Open
Human settlements and infrastructure in alluvial floodplains face erosional risk due to the lateral migration of meandering rivers. There is a large body of scientific literature on the dominant mechanisms driving river migration. However,…
View article: Geomorphic mapping and permafrost occurrence on the Koyukuk River floodplain near Huslia, Alaska
Geomorphic mapping and permafrost occurrence on the Koyukuk River floodplain near Huslia, Alaska Open
Permafrost occurrence measured in-situ and geomorphic maps drawn by hand using high-resolution satellite imagery for the Koyukuk River floodplain near Huslia, Alaska. The dataset was collected to characterize permafrost extent and rates of…
View article: The flocculation state of mud in the lowermost freshwater reaches of the Mississippi River: spatial distribution of sizes, seasonal changes, and their impact on vertical concentration profiles
The flocculation state of mud in the lowermost freshwater reaches of the Mississippi River: spatial distribution of sizes, seasonal changes, and their impact on vertical concentration profiles Open
We use in situ measurements of suspended mud to assess the flocculation state of the lowermost freshwater reaches of the Mississippi River. The goal of the study was to assess the flocculation state of the mud in the absence of seawater, t…
View article: Examining the impact of emissions scenario on lower Mississippi River flood hazard projections
Examining the impact of emissions scenario on lower Mississippi River flood hazard projections Open
The Mississippi River is the largest commercial waterway in North America and one of the most heavily engineered rivers in the world. Future alteration of the river’s hydrology by climate change may increase the vulnerability of flood miti…
View article: A New Method for In Situ Measurement of the Erosion Threshold of River Channels
A New Method for In Situ Measurement of the Erosion Threshold of River Channels Open
The vast majority of alluvial deposits have some degree of cohesion, typically due to the presence of clays and/or organic matter. Determining the threshold fluid shear stress, τ c , necessary to entrain these sediments is essential for pr…
View article: FlocARAZI: An In‐Situ, Image‐Based Profiling Instrument for Sizing Solid and Flocculated Suspended Sediment
FlocARAZI: An In‐Situ, Image‐Based Profiling Instrument for Sizing Solid and Flocculated Suspended Sediment Open
An inexpensive and compact underwater digital camera imaging system was developed to collect in situ high resolution images of flocculated suspended sediment at depths of up to 60 meters. The camera has a field of view of 3.7 × 2.8 mm and …
View article: The importance of threshold in alluvial river channel geometry and dynamics
The importance of threshold in alluvial river channel geometry and dynamics Open
Many cities and settlements are organized around alluvial rivers, which are self-formed channels composed of gravel, sand and mud. Much of the time alluvial river channels are oversized, in that they could accommodate greater water flow; y…
View article: What sets river width?
What sets river width? Open
The width of river channels is controlled by the resistance to erosion of the most difficult to erode material lining the channel.
View article: A Sticky Pursuit Of The Threshold Channel: The Effect Of Cohesion On Alluvial River Channel Geometry
A Sticky Pursuit Of The Threshold Channel: The Effect Of Cohesion On Alluvial River Channel Geometry Open
One of the simplest questions in riverine science remains unanswered: "What controls the width and depth of rivers?". This question has long been one of concern to scientists who seek to understand both the first-order and higher-order com…
View article: Evidence of, and a proposed explanation for, bimodal transport states in alluvial rivers
Evidence of, and a proposed explanation for, bimodal transport states in alluvial rivers Open
Gravel-bedded rivers organize their bank-full channel geometry and grain size such that shear stress is close to the threshold of motion. Sand-bedded rivers, on the other hand, typically maintain bank-full fluid stresses far in excess of t…
View article: Evidence of, and a Proposed Explanation for, Bimodal Transport States in Alluvial Rivers
Evidence of, and a Proposed Explanation for, Bimodal Transport States in Alluvial Rivers Open
Gravel-bedded rivers organize their bankfull channel geometry and grain size such that shear stress is close to the threshold of motion. Sand-bedded rivers on the other hand typically maintain bankfull fluid stresses far in excess of thres…
View article: Limits on the morphogenetic role of rain splash transport in hillslope evolution
Limits on the morphogenetic role of rain splash transport in hillslope evolution Open
An experimentally parameterized equation for rain splash transport was generalized in order to compute annual sediment transport rates for a range of climates. The resulting equation was then used to examine the conditions under which rain…