Emerging Methodologies for Turbulence Characterization in River Dynamics Study

Tiwari, Harinarayan; Khan, Mohammad Amir; Sharma, Nayan

doi:10.1007/978-981-10-1472-7_9

Cited by 6 publications

(5 citation statements)

References 30 publications

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“…Reduced sinuosity often is a sign for river straightening [54,93], an increase is a sign for tending towards a new equilibrium [87] but can also occur when the flow velocity increases [55] Relative length of channel structures Total length of channel structures in a focus region divided by the river length in the focus region An increase in the channel structures is a reaction to changes in the sediment load and/or changes in the river slope [87], often due to straightening [94] Anastomosing channel For anastomosing channels Anabranching rivers are often caused by flood-dominated flow regimes [63,83] Braided channel For braided river structures in single channels Sign for excess bedload, coarse bottom substrate and high valley bottom slope [57,95], instable state [96] Side arm For side arms Occur at flood events as a reaction to hydraulic stress; today side arms are preserved as habitats [97] Relative of number oxbows Number of oxbows in a focus region divided by the river length in km…”

Section: Digitalization Of River Courses and Resolutionmentioning

confidence: 99%

“…with Sinuosity as the change in sinuosity between two time slices, indicator for river straightening according to [54,58,93]; Braiding as the change in length of braided channel sections between two time slices, indicator for river straightening according to [58,63,95]; and Oxbows as the change in the number of oxbows between two time slices, indicator for river straightening according to [55].…”

Section: Digitalization Of River Courses and Resolutionmentioning

confidence: 99%

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Influence of 200 years of water resource management on a typical central European river. Does industrialization straighten a river?

et al. 2021

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Background Over the last 200 years, the courses of most European rivers have experienced significant irreversible changes. These changes are connected to different kinds of anthropogenic river use and exploitation, which have varied from running water mills and rafting to large-scale hydroelectric power plants, industrial water withdrawal and flood protection measures. Today, in most developed countries, water quality and ecological river development are important factors in water management. The aim of this study is to evaluate the specific impacts of different time periods during the last 200 years on river courses and their effects on current river management using the example of the 165-km-long German Rur River (North Rhine-Westphalia). The Rur River is a typical central European upland-to-lowland river whose catchment has been affected by various phases of industrial development. Methods In this study, a range of morphological changes over the last 200 years are determined based on historic maps and up-to-date orthophotos. River length, sinuosity, oxbow structures, sidearms and the number of islands are used to investigate human impact. The results are correlated with historic time periods. Results This analysis shows that river straightening increases, especially during the Industrial Revolution, even without direct hydraulic channelization. The period and grade of river straightening have a direct morphodynamic impact on today’s river restorations. Since the Rur River is a typical upland-to-lowland river, the results show an additional impact by geofactors, such as landform configurations. Conclusions Morphodynamic development is correlated with five historic periods of industrial development between 1801 and 2019 up to the introduction of the EU—Water Framework Directive (EU-WFD). Each period shows a different influence on the watercourse, which is connected with human intervention. Even if worldwide comparisons show that the five historical phases differ slightly in their timing between regions, they are applicable to other study areas.

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Section: Digitalization Of River Courses and Resolutionmentioning

confidence: 99%

Section: Digitalization Of River Courses and Resolutionmentioning

confidence: 99%

Influence of 200 years of water resource management on a typical central European river. Does industrialization straighten a river?

et al. 2021

View full text Add to dashboard Cite

show abstract

“…With: ∆ Change in sinuosity between two time slices; indicator for river straightening according to [54,58,93] ∆ Change in length of braided channel sections between two time slices; indicator for river straightening according to [58,63,95] ∆ Change in the number of oxbows between two time slices; indicator for river straightening according to [55] The increase in structural diversity between two time slices is defined as:…”

Section: Number Of Islands In a Focus Region Divided By The River Lenmentioning

confidence: 99%

Influence of 200 years of water resource management on a typical central European river Does industrialization straighten a river?

Wolf

Esser

Schüttrumpf

et al. 2021

Preprint

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Background Over the last 200 years, the courses of most European rivers have experienced significant irreversible changes. These changes are connected to different kinds of anthropogenic river use and exploitation, which have varied from running water mills and rafting to large-scale hydroelectric power plants, industrial water withdrawal and flood protection measures. Today, in most developed countries, water quality and ecological river development are important factors in water management. The aim of this study is to evaluate the specific impacts of different time periods during the last 200 years on river courses and their effects on current river management using the example of the 165 km-long German Rur River (North Rhine-Westphalia). The Rur River is a typical central European upland to lowland river whose catchment has been affected by various phases of industrial development.MethodsIn this study, a range of morphological changes over the last 200 years are determined based on historic maps and up-to-date orthophotos. River length, sinuosity, oxbow structures, sidearms and the number of islands are used to investigate human impact. The results are correlated with historic time periods.ResultsThis analysis shows that river straightening increases, especially during the Industrial Revolution, even without direct hydraulic channelization. The period and grade of river straightening have a direct morphodynamic impact on today’s river restorations. Since the Rur River is a typical upland to lowland river, the results show an additional impact by geofactors, such as landform configurations.ConclusionsMorphodynamic development is correlated with five historic periods of industrial development between 1801 and 2019 up to the introduction of the EU - Water Framework Directive (EU-WFD). Each period shows a different influence on the watercourse, which is connected with human intervention. Even if worldwide comparisons show that the five historical phases differ slightly in their timing between regions, they are applicable to other study areas.

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“…The sampling rate of the ADV is up to 50Hz and the resolution is 0.01 cm/s. The device sends out a beam of acoustic waves and these waves bounce off moving particulate matter in the water and then calculates the velocity (Tiwari et al, 2016). Kaolin clay was used as suspended solid materials to increase the accuracy of the velocity measurements.…”

Section: Measurementsmentioning

confidence: 99%

Experimental investigation of the effect of vegetation on dam break flood waves

Oguzhan

Aksoy

2020

Journal of Hydrology and Hydromechanics

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Dams have an important role in the industrial development of countries. Irrespective of the reason for dam break, the flood can cause devastating disasters with loss of life and property especially in densely populated areas. In this study, the effects of the vegetation on the flood wave propagation in case of dam break were investigated experimentally by using the distorted physical model of Ürkmez Dam. The horizontal and vertical scales of the distorted physical model are 1/150 and 1/30, respectively. The dam break scenarios were achieved by means of a gate of rectangular and triangular shape. The results obtained from experiments performed with vegetation were compared and interpreted with those obtained from experiments at which the vegetation configuration was absent. The analysis of the experimental data showed that the presence of vegetation causes a significant decrease in water depths as the flood wave propagates to the downstream and greatly reduces its impact on the settlements. It is also revealed that dam break shape plays an important role in temporal variation of flood wave.

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Emerging Methodologies for Turbulence Characterization in River Dynamics Study

Cited by 6 publications

References 30 publications

Influence of 200 years of water resource management on a typical central European river. Does industrialization straighten a river?

Influence of 200 years of water resource management on a typical central European river. Does industrialization straighten a river?

Influence of 200 years of water resource management on a typical central European river Does industrialization straighten a river?

Experimental investigation of the effect of vegetation on dam break flood waves

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