Impact of a large flood on mountain river habitats, channel morphology, and valley infrastructure

Hajdukiewicz, Hanna; Wyżga‬‬, Bartłomiej; Mikuś, Paweł; Zawiejska, Joanna; Radecki‐Pawlik, Artur

doi:10.1016/j.geomorph.2015.09.003

Cited by 75 publications

(42 citation statements)

References 37 publications

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“…Floodwaters are an extremely effective channel-shaping factor. Large floods, in particular, are effective in floodplain development [25,[56][57][58][59][60][61]. Their significance is examined in this section in terms of how they affect spontaneous renaturalization in a gravel-bed river during the post-regulation period, in this case, the Raba River.…”

Section: Role Of High Water Stages In the Evolution Of A Post-regulatmentioning

confidence: 99%

The Evolution of Gravel-Bed Rivers during the Post-Regulation Period in the Polish Carpathians

Gorczyca

Krzemień

Jarzyna

2020

Water

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This study provides a conceptual model of the functioning of gravel-bed rivers during the post-regulation period in Poland and forecasts their subsequent evolution. The main difference between fluvial processes during the pre-regulation and post-regulation period is that they are limited to a zone that is currently several times narrower and trapped in a deep-cut channel. During the river post-regulation period, the construction of additional river training works was significantly limited in river channels. Moreover, all forms of economic activity were significantly reduced in the channel free migration zone, particularly bed gravel extraction operations. As a result of these changes, a limited recovery of the functioning and hydromorphology of the river channel occurred via a return to conditions in effect prior to river regulation. In recovering sections of river, the channel gradually broadens, and its sinuosity and number of threads increase. The overall process can be called spontaneous renaturalization, which yields a characteristic post-regulation river channel. The conceptual model was developed on the basis of the evolution of the gravel-bed river, the Raba River, during the post-regulation period in the Polish Carpathian Mountains.

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Section: Role Of High Water Stages In the Evolution Of A Post-regulatmentioning

confidence: 99%

The Evolution of Gravel-Bed Rivers during the Post-Regulation Period in the Polish Carpathians

Gorczyca

Krzemień

Jarzyna

2020

Water

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“…For instance, in systems where sediment supply is limited in the upper catchment, down cutting may intensify in response to increased erosion power (Sklar & Dietrich, ), facilitating greater flood surge downstream and floodplain inundation. Broadly, the potential impacts of increased flood intensity (and energy) include channel enlargement and incision, accelerated bank erosion and channel migration that may initiate greater system instability (Hajdukiewicz, Wyżga, Mikuś, Zawiejska, & Radecki‐Pawlik, ; Righini et al, ; Wolman & Gerson, ). Increased bed and bank erosion in upper sections may enhance sediment delivery to the lowlands with consequences for channel and floodplain characteristics.…”

Section: Mechanisms: Climate–catchment–reach Cascadementioning

confidence: 99%

Climate change and European rivers: An eco‐hydromorphological perspective

O’Briain

2019

Ecohydrology

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Climate change is expected to modify temperature and precipitation patterns throughout Europe, leading to warmer drier summers; wetter, milder winters; and an extended growing season. Alterations to feedbacks between important eco‐physical structuring processes driven by climate change may modulate river morphology, floodplain characteristics, and their biological communities. Current understanding is reviewed and synthesised to explore the potential responses, mechanisms, and ramifications of climatic shifts for the European riverscape. Fundamental drivers of change are expected to be (a) disturbance deviation beyond the historical norm and (b) vegetation morphodynamics, a key river process where ecological and fluvial‐geomorphological attributes interact to shape the physical environment. Increased seasonal temperature, summer drought, and winter flooding may affect the colonisation, growth, and mortality of plant species with consequences for riverscape structure and function as succession patterns adjust with repercussions for hydraulics and sediment dynamics. Such opposing winter and summer climate regimes are likely to impact vegetation patch dynamics, reflected in an increasingly variable patch mosaic as disturbance intensity deviates further from historical background conditions. How changes to climate drivers manifest themselves in individual river systems will also be affected by attributes such as catchment topography, geology, vegetation type, and previous human alterations. Where large scale change occurs, it will have consequences for the type and function of biological communities inhabiting the riverscape. Conventional engineering responses to meteorological disturbance will amplify the effect on river biota by reducing their ecological resilience, highlighting the need for a management response that integrates ecological and societal benefits simultaneously.

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“…Human activities, such as sand excavation (Wang, Liu, & Shi, 2014;Brunier, Anthony, Goichot, Provansal, & Dussouillez, 2014), dredging (Hajdukiewicz, Wyżga, Mikuś, Zawiejska, & Radecki-Pawlik, 2016), and waterway regulation projects (Dai, Liu, Fu, & Xie, 2013), have also affected river channel adjustments over certain periods of time.…”

Section: Human Activitiesmentioning

confidence: 99%

Impact of the operation of a large‐scale reservoir on downstream river channel geomorphic adjustments: A case study of the Three Gorges

Yang

Zhang

Zhu

et al. 2018

River Research & Apps

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To evaluate the effects of reservoir construction on the geomorphology of downstream reaches, a case study is performed on the Three Gorges Reservoir (TGR) by comparing data collected before and after impoundment of the reservoir. This study focuses on a 1,183‐km‐long reach downstream from the TGR and investigates the temporal and spatial characteristics and patterns of geomorphic adjustment in the downstream reaches. The amount of erosion in flood plain channels and the annual average intensity of erosion in downstream reaches after 12 years of impoundment are larger than the predicted values before the impoundment of the TGR. The maximum intensity of erosion was found at 410 km from the dam, with an average thalweg incision of 1.5 m, and the main zone of erosion migrated approximately 80 km downstream. At both preimpoundment and postimpoundment, erosion occurred the along beaches and channels in the Yichang–Chenglingji reach. The pattern of erosional channels and depositional river floodplain changed to erosional channels and erosional river floodplain in the Chenglingji–Hankou reach after the trial impoundment stage. In the Hankou–Hukou reach, the erosional channels and depositional river floodplain pattern changed to erosional deep channels, erosional low beaches, and depositional high‐river floodplain during the early impoundment stage. After the trial impoundment stage, erosion continued in the deep channels, but minor deposition occurred on the river floodplain. Moreover, the discharge of clear water increased, and the duration from middle to low‐water levels increased, leading to more concentrated erosion in low‐water channels. The intensity of the erosion along the river floodplain decreased due to the shortened duration of high‐water levels and reduced human activity.

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Impact of a large flood on mountain river habitats, channel morphology, and valley infrastructure

Cited by 75 publications

References 37 publications

The Evolution of Gravel-Bed Rivers during the Post-Regulation Period in the Polish Carpathians

The Evolution of Gravel-Bed Rivers during the Post-Regulation Period in the Polish Carpathians

Climate change and European rivers: An eco‐hydromorphological perspective

Impact of the operation of a large‐scale reservoir on downstream river channel geomorphic adjustments: A case study of the Three Gorges

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