Flow structure and channel morphology after artificial chute cutoff at the meandering river in the upper Yellow River

Qiao, Qiao; Li, Chunguang; Jing, Hefang; Huang, Like

doi:10.1007/s12517-022-09431-6

Cited by 6 publications

(7 citation statements)

References 49 publications

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“…In a prior study of artificial chute cutoff in the upper Yellow River, Qiao et al 34 examined the fluid dynamics. They identified recirculation zones at the end of the spur dikes, with opposite directions on the left and right banks.…”

Section: Discussionmentioning

confidence: 99%

“…The chute channel could be divided into two sections, with nine spur dikes distributed in the upstream section and an artificial diversion channel situated in the downstream section (Figure 1C). After the formation of the artificial chute cutoff, severe scouring and retreat of the left bank occurred from May to October 2018, extending up to 270 m because of inadequate protection from the spur dikes, whereas the right bank gradually silted up, forming a sandbar 34 . Consequently, significant changes were observed in the new chute cutoff following the artificial cutoff.…”

Section: Study Areamentioning

confidence: 99%

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Numerical modeling of two-dimensional hydrodynamics in an artificial chute cutoff under different hydrologic conditions

Qiao,

Yang,

Hao

et al. 2024

Preprint

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Chute cutoff represents a significant geomorphic event in the evolution of meandering rivers. Following the chute cutoff, channel adjustments occur rapidly. Therefore, investigating the interaction between the flow dynamics and channel morphology is relatively challenging. However, numerical simulations provide enhanced insights into the hydrodynamic characteristics of artificial chute cutoff. In the initial year of an artificial chute cutoff evolution in the Ningxia section of the Yellow River, we collected data on the channel topography and three-dimensional flow velocity. These measurements were utilized to calibrate the established two dimensional mathematical model and explore the impacts of different hydrological conditions on the hydrodynamics of the chute channel after the artificial cutoff. The simulation results revealed the complexity of the two-dimensional flow field within the artificial chute cutoff characterized by several regions of flow separation and recirculation zones, which was related to chute channel topography and boundary conditions. These recirculation zones varied with the inlet flow. Across the three discharges, most of the flow remained concentrated in the main channel. At higher discharges increasing the water levels, the floodplain became inundated, and a shear layer between the main channel and floodplain emerged. This study presented a detailed depiction of the flow structure within artificial chute cutoff under diverse river geomorphological and hydrological conditions. This research can bridge knowledge gaps regarding chute cutoffs in the upper reaches of the Yellow River, contributing to the improvement of conceptual models concerning chute cutoff phenomena.

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Section: Discussionmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Numerical modeling of two-dimensional hydrodynamics in an artificial chute cutoff under different hydrologic conditions

Qiao,

Yang,

Hao

et al. 2024

Preprint

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“…Those field observations have shown that turbulence structures are affected by river bed materials (Sukhodolov et al, 1998), bedforms (Holmes & Garcia, 2008), submerged vegetation (Sukhodolov & Sukhodolova, 2010), and additional forcing such as tidal currents (Heathershaw, 1979; Sanford & Lien, 1999). In addition, river morphology and man‐made hydraulic structures can affect turbulence structures by introducing secondary flows and reshaping vertical turbulence profiles, such as at river bends (Constantinescu et al, 2013), near banks (Kumar Das et al, 2020), around and over wing dikes (Jamieson et al, 2011), at river confluences (Sukhodolov et al, 2017), and in chute cutoffs (Qiao et al, 2022; Zinger et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…structures can affect turbulence structures by introducing secondary flows and reshaping vertical turbulence profiles, such as at river bends (Constantinescu et al, 2013), near banks (Kumar Das et al, 2020), around and over wing dikes (Jamieson et al, 2011), at river confluences (Sukhodolov et al, 2017), and in chute cutoffs (Qiao et al, 2022;Zinger et al, 2013).…”

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confidence: 99%

Turbulence near a sandbar island in the lower Missouri River

Elliott

Call

et al. 2023

River Research & Apps

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River turbulence is spatially variable due to interactions between morphology of rivers and physical mechanics of flowing water. Understanding the variation of turbulence in rivers is important for characterizing transport processes of soluble and particulate materials in these systems. We present an exploratory effort to understand ecologically relevant flow patterns using measurements of mean flow and turbulence in a highly engineered river channel around an island in the lower Missouri River. Specifically, the profiles of mean river velocities were investigated to examine the logarithmic relation and associated parameters, including shear velocity and bed roughness. Turbulence intensity and Reynolds shear stress were compared with classic open‐channel profiles and previously reported river data in the hydraulics literature. With the capability of pulse‐to‐pulse coherent Doppler velocity profiling in high spatial resolution, we estimated the profiles of turbulence dissipation rate using resolved one‐dimensional velocity spectra. These measurement data allow us to examine the validity of turbulence production‐dissipation balance and the classic open‐channel profiles of turbulence statistics, including turbulence intensity, Reynolds shear stress, dissipation rate, and eddy viscosity. The field data show a strong variation of turbulence profiles in close vicinity of the river island. In shallow water depths close to the island, turbulence is substantially enhanced in comparison with classic open‐channel profiles. Such turbulence enhancement is likely attributed to non‐uniformity of the flow structures.

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“…Sukhodolov et al, 1998), bedform (Holmes Jr & Garcia, 2008), submerged vegetation (A. N. Sukhodolov & Sukhodolova, 2010) and additional forcing such as tidal currents (Heathershaw, 1979;Sanford & Lien, 1999). In addition, river morphology and man-made hydraulic structures can affect turbulence structures by introducing secondary flows and reshaping vertical turbulent profiles such as at river bends (Constantinescu et al, 2013), near-bank (Kumar Das et al, 2020, wing dikes (Jamieson et al, 2011), river confluences (A. N. Sukhodolov et al, 2017), and chute cutoffs (Qiao et al, 2022;Zinger et al, 2013). Classic turbulent mixing profiles (e.g., parabolic profile of eddy viscosity) are effective and useful in three-dimensional particle tracking models for egg drift (Garcia et al, 2013;Garcia et al, 2015;Heer et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Transport of invasive carp eggs and the effect of river turbulence

Li¹

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Bighead (Hypophthalmichthys nobilis), silver (Hypophthalmichthys molitrix) and grass (Ctenopharyngodon Idella) carps are important food sources in East Asian while considered an invasive species in North America due to their extremely large population and detrimental effects on native fishes. These species are mass spawners with similar reproductive characteristics. Suspension of eggs is believed to be necessary and predictive of successful recruitment. Dependence on suspension makes them incline to spawn in turbulent zones in rivers. Egg transport models have been used to understand egg drift process of invasive carps, among which FluEgg is widely used. FluEgg has been tested and applied in both rivers and laboratory experiments. However, the limitation of FluEgg is the uncertainty caused by its usage of one-dimensional (1-D) hydraulic data and parameterization of hydrodynamics in the complex large river. The objective of this research is to develop a multi-dimensional modeling framework to better reflect the inherent physics of eggs transport associated with river turbulence. First, we developed a fully three-dimensional (3-D) stochastic egg drift model, namely SDrift. Based on egg characteristics as a function of post-fertilization time and temperature, SDrift applies Markov-chain random walk to simulate stochastic movement of eggs, and can be coupled with prescribed hydrodynamics parametrization using field-survey data or simulated 3-D hydrodynamics. Second, the performance of SDrift was compared with FluEgg and evaluated using experimental and simulated results in two idealized channels and a representative reach of the Lower Missouri River. To apply SDrift on a large river, we processed a fully 3-D high-resolution (4x4x0.4 m, 49,053,215 cells) computational fluid dynamics (CFD) modeling using Reynolds-averaged Navier Stokes (RANS) simulation in an 8-km long reach in the Lower Missouri River. The hydrodynamics model was calibrated and validated with field measurements of water-surface elevation and velocity under different discharge conditions. With the simulated hydrodynamics, SDrift was applied to elucidate egg transport processes in a highly engineered large river. The modeling results show the strong effects of localized turbulence on egg transport due to in-steam hydraulic structures and strong morphological variations in the river. Finally, a field survey of river turbulence was carried out at a representative sandbar island within a short spatial range in the Lower Missouri River. The measurement data allow evaluations of river turbulence structures and testing of the validity of classic turbulence parameterization. The measurements and evaluations provide information on the spatial scale of turbulence variabilities that may be important in ecologically relevant habitats.

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Flow structure and channel morphology after artificial chute cutoff at the meandering river in the upper Yellow River

Cited by 6 publications

References 49 publications

Numerical modeling of two-dimensional hydrodynamics in an artificial chute cutoff under different hydrologic conditions

Numerical modeling of two-dimensional hydrodynamics in an artificial chute cutoff under different hydrologic conditions

Turbulence near a sandbar island in the lower Missouri River

Transport of invasive carp eggs and the effect of river turbulence

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