The drainage of the Lake Ha!Ha! reservoir and downstream geomorphic impacts along Ha!Ha! River, Saguenay area, Quebec, Canada

Brooks, Greg; Lawrence, Dan

doi:10.1016/s0169-555x(98)00109-3

Cited by 65 publications

(46 citation statements)

References 8 publications

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“…Rosenburg 1) adjacent to the main channel. Similar erosion forms (elongated scour holes) like those documented after the 2002 flood along the Kamp River were also described by Brooks and Lawrence (1999) for the lake outburst flood at the Ha!Ha! River.…”

Section: Methodssupporting

confidence: 78%

“…Therefore, channel width prior to the 2002 flood (determined by aerial photographs; Figures 3-5) was compared to the width of floodplain changes (morphologically affected areas). Channel morphology and erosional forms along the Kamp River were categorized using the classification scheme of Wohl (1998), Cenderelli and Wohl (2003) and Brooks and Lawrence (1999). The classification of Wohl (1998) is best applied on the channel reach scale (Wohl and Merritt, 2001).…”

Section: Methodsmentioning

confidence: 99%

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Morphodynamics of a 1000‐year flood in the Kamp River, Austria, and impacts on floodplain morphology

Hauer

Habersack

2009

Earth Surf Processes Landf

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This paper investigates the impact of a 1000-year flood in August 2002 on floodplains and valley morphology of an Austrian mixed alluvial bed rock river. Discharges with a recurrence interval between 500 and 2000 years caused distinctive overbank scouring and material deposition in the floodplains. After the 1000-year flood, those morphologically affected areas were at random intervals documented over the whole longitudinal profile. In addition to overbank erosion in curved sections (cutoffs), the river bed locally widened, floodplain stripping occurred and local overbank scours were documented along straight parts of the river. A hydrodynamic-numerical model, combined with field measurements, was used to analyse the cause of these erosional landforms. Based on the modelled hydraulic conditions for a one-year flood ), the numerical results allowed a cause-effect study with 19 parameters. Deterministic and statistical analysis (ANOVA, discriminant analysis) showed that the morphodynamic effects of the 2002 flood were influenced by the variability of valley morphology of the Kamp River, which led partially to supercritical flow during flood constriction. These processes were in some cases also anthropogenically influenced. Lateral constriction and expansion of the valley geometry over short distances led to scouring and aggradation within the inundated areas during the event. These morphological features were therefore responsible for the elongated scour holes in the floodplains.

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Section: Methodssupporting

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Morphodynamics of a 1000‐year flood in the Kamp River, Austria, and impacts on floodplain morphology

Hauer

Habersack

2009

Earth Surf Processes Landf

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“…Ha! Lake breakout flood [Lapointe et al, 1998;Brooks and Lawrence, 1999;Capart et al, 2007b]. The breach originated when the lake level upstream of a concrete dam overtopped a small saddle dyke elsewhere along the lake perimeter.…”

Section: Further Comparisons With Measured Datamentioning

confidence: 99%

“…Ha! Lake breakout flood of 1996, which caused channel avulsion and extreme valley widening far downstream of the dam breach [Lapointe et al, 1998;Brooks and Lawrence, 1999;Capart et al, 2007b]. Few cases, however, feature such extreme geomorphic changes away from the dam breach itself, and the assumption that the downstream valley is rigid typically constitutes a good first approximation.…”

Section: Introductionmentioning

confidence: 99%

Analytical solutions for gradual dam breaching and downstream river flooding

Capart

2013

Water Resources Research

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[1] An analytical model is proposed to describe lake drainage and downstream flooding due to the gradual breaching of natural and manmade earthen dams. Erodible triangular dams are considered, undergoing gradual incision by a breaching channel of constant effective width. Adopting a simple stream power law for dam material transport, the long profile evolution of the breaching channel is governed by a diffusion equation with variable diffusion rate, proportional to the water discharge. The resulting flood is routed downstream using the kinematic wave equation. Moving boundary problems are obtained due to retrogression of the breach crest, and to the downstream propagation of the flood wavefront. For both the dam breaching and flood routing problems, explicit analytical solutions are derived. They depict a breaching process that is at first self-accelerating, then becomes self-limiting. Results include boundary paths, long profiles, and stage and discharge hydrographs. In particular, the breaching solution yields a discharge hydrograph of simple analytical shape that turns out to be ideally suited for kinematic wave routing. The model is applied to the well-documented breaching of the Tangjiashan landslide dam, Sichuan, in June 2008. Calculated results for this and other cases are in reasonably good agreement with the measured data. As the model is simple to apply, with minimal computational and data requirements, it could prove useful as a tool for rapid risk assessment. The proposed analytical approach also complements numerical models by providing more transparent links between solution outcomes and the problem data.

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“…heavy precipitation) on the morphodynamics of different rivers. Many articles addressing catastrophic floods (extraordinary precipitation/dam breaking) were conducted within one river basin (Phillips, 2002;Cenderelli and Wohl, 2003b;Brooks and Lawrence, 1999) without the possibility to extrapolate or analyze the impact on neighboring river catchments. Thus, the impacts on morphodynamics and the derived cause-effect studies have to be seen as a site and/or river specific result not allowing a generalization of cause-effect processes which might be used for improving and extending hazard zone plans and thus preventing high socioeconomic losses.…”

Section: Introductionmentioning

confidence: 99%

Scale orientated analysis of river width changes due to extreme flood hazards

Krapesch

Hauer

Habersack

2011

Nat. Hazards Earth Syst. Sci.

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Abstract. This paper analyses the morphological effects of extreme floods (recurrence interval > 100 years) and examines which parameters best describe the width changes due to erosion based on 5 affected alpine gravel bed rivers in Austria. The research was based on vertical aerial photos of the rivers before and after extreme floods, hydrodynamic numerical models and cross sectional measurements supported by LiDAR data of the rivers. Average width ratios (width after/before the flood) were calculated and correlated with different hydraulic parameters (specific stream power, shear stress, flow area, specific discharge). Depending on the geomorphological boundary conditions of the different rivers, a mean width ratio between 1.12 (Lech River) and 3.45 (Trisanna River) was determined on the reach scale. The specific stream power (SSP) best predicted the mean width ratios of the rivers especially on the reach scale and sub reach scale. On the local scale more parameters have to be considered to define the "minimum morphological spatial demand of rivers", which is a crucial parameter for addressing and managing flood hazards and should be used in hazard zone plans and spatial planning.

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The drainage of the Lake Ha!Ha! reservoir and downstream geomorphic impacts along Ha!Ha! River, Saguenay area, Quebec, Canada

Cited by 65 publications

References 8 publications

Morphodynamics of a 1000‐year flood in the Kamp River, Austria, and impacts on floodplain morphology

Morphodynamics of a 1000‐year flood in the Kamp River, Austria, and impacts on floodplain morphology

Analytical solutions for gradual dam breaching and downstream river flooding

Scale orientated analysis of river width changes due to extreme flood hazards

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