Cumberland House in the Saskatchewan River Delta: flood memory and the municipal response, 2005 and 2011

Massie, Merle; Reed, Maureen G.

doi:10.4337/9781781006672.00011

Cited by 2 publications

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“…The highest post‐1953 lake level of 268.5 m was recorded during the 2011 flood (Figures 5 and 11a). Recent floods of 2005 and 2011 caused serious problems for Cumberland House residents, but flooding of the town was avoided (Massie & Reed, 2013; Shook, 2015).…”

Section: Resultsmentioning

confidence: 99%

Autocyclic (avulsion‐induced) base‐level change, its upstream and downstream controls, and effects on floodbasin sedimentation: The 1870s avulsion of the Saskatchewan River, Cumberland Marshes, Canada

Morozova

2021

Earth Surf Processes Landf

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This study examines centennial‐scale hydrological and sedimentological effects of floodplain inundation by avulsion and its upstream and downstream controls. The 1870s avulsion in Cumberland Marshes diverted the Saskatchewan River flow towards Cumberland Lake, a local base level. It invaded a poorly drained sub‐basin of Cumberland Marshes floodplain linked to the parent Saskatchewan River by two small outlets in the resistant substrate. The rapid increase in inflow (~5× on average) during the earlier stages of the avulsion resulted in the base‐level rise and floodplain inundation by the avulsion lake. Since the early 20th century, the forced regression of the avulsion lake occurred, caused by ~5× outlet channel enlargement by ‘hungry‐water’ outflows, whereas the mean lake inflows experienced little change. The avulsion lake served as an effective sediment trap and was filled by predominantly progradational sandy and silty avulsion deposits up to 3–4 m thick, covering about 700 km2. Elsewhere, fluviodeltaic settings with ‘negative relief’ and limited hydrologic connectivity with the rest of the floodplain may be prone to avulsion lakes that form if the rates of inflow increased by avulsion exceed the rates of outflow. Avulsion lakes can last for ~100 years or more before they drain and/or become filled by overbank sediments. On well‐drained floodplains, inundations by avulsions are expected to be short‐term and result in little progradational deposition. This study demonstrates that in some local hydrographic basins, base level becomes a variable of an evolving avulsion rather than its fixed external control. Although avulsion‐induced base‐level changes are short‐lived, they affect 102–103 km2 of a floodplain and occur rapidly, accompanied by high aggradation rates.

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Section: Resultsmentioning

confidence: 99%

Autocyclic (avulsion‐induced) base‐level change, its upstream and downstream controls, and effects on floodbasin sedimentation: The 1870s avulsion of the Saskatchewan River, Cumberland Marshes, Canada

Morozova

2021

Earth Surf Processes Landf

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“…As an illustration, during recent signi cant oods that occurred in 2005 and 2013, inhabitants of Cumberland House were evacuated, even though the community did not ood. In 2011, however, with the highest water level in recorded history, the community chose not to evacuate (Massie & Reed, 2013). There is thus a need for better tools at a local level to assist with planning for future scenarios that may include more extreme conditions of oods and droughts.…”

Section: Site Descriptionmentioning

confidence: 99%

Listening to Each Other: A collaborative 2D hydraulic model to examine water and sediment availability in an inland delta

Sabokruhie,

Duffy,

Mohammadiazar

et al. 2024

Preprint

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The Saskatchewan River Delta is the largest inland freshwater delta in North America. The delta has been inhabited by humans for at least 7,000 years, but this complex social-ecological system has been disrupted by reduced water and sediment flows due to upstream water resource development. To follow up on previous on-land participant observations and semi-structured interviews that documented changes to the delta, a two-dimensional (2D) hydraulic HEC-RAS model was set up to collaboratively determine future scenarios. The model domain contains the main channel, floodplains, and hinterland areas while observed meteorological and hydrological data were used to force and calibrate the model. The model considered recent observations, examining scenarios with and without different mitigation measures to improve water availability and sediment transport within the delta. Modellers and residents jointly chose to focus on the strategic placement of weirs to raise the water depth in the delta's largest lake (Cumberland Lake) as a practical method. The model's ability to visualize and animate results has been serving as a boundary object, allowing crucial conversations about water to occur within and between community members and upstream water decision-makers. This paper discusses lessons learned from collaborative modelling that may provide insight beyond this important delta system.

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Cumberland House in the Saskatchewan River Delta: flood memory and the municipal response, 2005 and 2011

Cited by 2 publications

References 0 publications

Autocyclic (avulsion‐induced) base‐level change, its upstream and downstream controls, and effects on floodbasin sedimentation: The 1870s avulsion of the Saskatchewan River, Cumberland Marshes, Canada

Autocyclic (avulsion‐induced) base‐level change, its upstream and downstream controls, and effects on floodbasin sedimentation: The 1870s avulsion of the Saskatchewan River, Cumberland Marshes, Canada

Listening to Each Other: A collaborative 2D hydraulic model to examine water and sediment availability in an inland delta

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