Experimental insights into the effect of event sequencing and sediment input texture on step‐pool channel evolution

Wang, Jia-mei; Hassan, Marwan A.; Saletti, Matteo; Chen, Xingyu; Fu, Xudong; Zhou, Hongwei; Yang, Xing-guo

doi:10.1002/esp.5272

Cited by 3 publications

(2 citation statements)

References 54 publications

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“…It seems that the relatively high stability of steps in East Creek could be because of the low sediment supply to the channel. The influence of sediment supply on the stability of step-pool morphology has been the focus of several flume experiments (e.g., Hohermuth & Weitbrecht, 2018;Saletti & Hassan, 2020a;Wang et al, 2020Wang et al, , 2021. For example, Hohermuth and Weitbrecht (2018) showed that with the increase in bedload movement step stability deceases.…”

Section: Steps Remain Stable Despite the Mobility Of Individual Keyst...mentioning

confidence: 99%

“…More recent work (Saletti & Hassan, 2020a, 2020bWang et al, 2020Wang et al, , 2021 showed how additional parameters strongly influence step stability. They identified channel geometry (with areas of local channel narrowing being the more suitable for stable steps) and the magnitude of sediment supply (with a maximum step frequency obtained for values of sediment supply larger than zero but well below transport capacity).…”

Section: Steps Remain Stable Despite the Mobility Of Individual Keyst...mentioning

confidence: 99%

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Sediment Dynamics and Bed Stability in Step‐Pool Streams: Insights From 18 Years of Field Observations

Hassan

Saletti

McDowell

et al. 2023

Water Resources Research

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Step‐pools are a common morphology in gravel‐bed streams with gradients between 3% and 30%, where coarse sediment and wood are present. Recent experimental work has offered insight on the formation of step‐pools, flow resistance, and interactions between sediment transport and channel morphology. However, field observations are sparse and often limited by short observation periods. Using an extensive 18‐year data set, we examine controls on sediment mobility, step stability, and sediment storage in East Creek, a step‐pool reach in British Columbia. Event bedload yield correlated with peak flow and ranged over two orders of magnitude. For most events, bedload grain‐size was finer than the grain size distribution of the sediment found in pools. Fractional sediment mobility was independent of the flow magnitude and controlled by sediment supply. The large stones that comprise the steps were generally mobile during large events (>10‐year recurrence interval), although the largest ones were not. Despite the movement of large stones, the skeleton of the steps remained in place even during an event with a near 125‐year recurrence interval. Temporal trends in sediment storage in pools show that most events cause negligible changes in sediment storage. Our field observations indicate that the step‐pool morphology of East Creek is stable, as the morphology and shape of the steps persisted under a wide range of flows. The overall stability of the reach is confirmed by observed trends in bedload yield and particle mobility.

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Section: Steps Remain Stable Despite the Mobility Of Individual Keyst...mentioning

confidence: 99%

Section: Steps Remain Stable Despite the Mobility Of Individual Keyst...mentioning

confidence: 99%

Sediment Dynamics and Bed Stability in Step‐Pool Streams: Insights From 18 Years of Field Observations

Hassan

Saletti

McDowell

et al. 2023

Water Resources Research

Self Cite

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Impacts of magnitude and texture of variable sediment supply on bedload transport

Zhou,

Wang,

et al. 2024

Acta Geophys.

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Opportunities for Leveraging Existing Hydrologic and Hydraulic Models Developed for Water Quantity Management to Mitigate Flooding Due to Extreme Precipitation

Hensyl,

Borhani,

Payab

et al. 2024

JWMM

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With a focus on a specific flood-prone community in Camden, NJ, this research utilizes a detailed hydraulic and hydrologic (H&H) model to assesses the impacts of climate change on Combined Sewer Overflows (CSOs) and localized flooding under two different infrastructure scenarios. In the US, the Clean Water Act compels regulated utilities to develop Long-Term Control Plans to reduce combined sewer overflows (CSOs), but there is no parallel mandate to simultaneously reduce flooding within the associated service areas. With different control measures in place, H&H models are frequently used to evaluate CSO volumes and frequencies under historical climate conditions. However, precipitation intensification and sea level rise (SLR) will also modify CSO volumes. This study uses a calibrated and validated 1D and 2D Personal Computer Stormwater Management Model (PCSWMM) simulation to predict both CSO discharges and flooding under different climate and infrastructure scenarios. A total of ten climate change scenarios comprising a range of plausible climate futures are considered. The infrastructure scenario that is tested would divert stormwater generated in an upstream municipality (Pennsauken, NJ) away from Camden’s combined sewer system. Without the disconnection, increases in precipitation will increase CSOs, whereas SLR primarily increases flooding. The proposed mitigation strategy can immediately reduce both CSOs and flooding, but with diminishing effectiveness over time, as climate change demonstrates the need for supplemental measures. Areas for further analysis regarding alternative mitigation methods and future research are outlined.

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Experimental insights into the effect of event sequencing and sediment input texture on step‐pool channel evolution

Cited by 3 publications

References 54 publications

Sediment Dynamics and Bed Stability in Step‐Pool Streams: Insights From 18 Years of Field Observations

Sediment Dynamics and Bed Stability in Step‐Pool Streams: Insights From 18 Years of Field Observations

Impacts of magnitude and texture of variable sediment supply on bedload transport

Opportunities for Leveraging Existing Hydrologic and Hydraulic Models Developed for Water Quantity Management to Mitigate Flooding Due to Extreme Precipitation

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