Numerical simulation of flow and bed morphology in the case of dam break floods with vegetation effect

Zhang, Mingliang; Xu, Yuanyuan; Qiao, Yang; Jiang, Hengzhi; Zhang, Zhongzhe; Zhang, Guosheng

doi:10.1016/s1001-6058(16)60604-2

Cited by 16 publications

(5 citation statements)

References 17 publications

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“…The hydro-morpho-dynamic model has been widely used in river engineering and fluvial geomorphology for describing the river hydrodynamics and hydromorphology (Abad, Buscaglia, & Garcia, 2008;Wu, 2008;Zhang et al, 2016). The hydro-morpho-dynamic model's accuracy has been intensively tested by researchers and efficiency in both cost and time could be guaranteed (Wu, 2008).…”

Section: The Opportunities and Challenges Of The Ecohydraulic Modelmentioning

confidence: 99%

Development of eco‐hydraulic model for assessing fish habitat and population status in freshwater ecosystems

2018

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An eco‐hydraulic model is described, namely, “WW‐Eco‐tools.” The model is composed of hydro‐morpho‐dynamic, habitat, and population models. Fish habitat suitability models assess habitat quality, based on abiotic parameters, namely, flow velocity, depth, and substratum data. These are all derived from a hydro‐morpho‐dynamic model. The relationships between parameters and habitat features are represented as suitability index curves (SI curves) or fuzzy rules. To dynamically simulate fish species, two different population models are developed. The first is converted from a logistic population concept. Its model parameters are related to time‐dependent fish habitat conditions, namely, weighted usable areas and an overall suitability index. The second model is based on a matrix population concept, with numbers as the only state vector. Age‐specific fecundities and survival rates depend on the habitat qualities defined in the matrix population model. The eco‐hydraulic model provides very promising results, highlighting the fundamental role of temporal variability of hydro‐morphological parameters in structuring habitat and populations of fish species. Using this software to anticipate water management changes, simulated population trends can help decision‐makers optimize management measures.

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Section: The Opportunities and Challenges Of The Ecohydraulic Modelmentioning

confidence: 99%

Development of eco‐hydraulic model for assessing fish habitat and population status in freshwater ecosystems

2018

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“…Additionally, the present results offer benchmark data for future numerical investigations given the increased focus on modeling and simulating dam-break problems 61,[81][82][83][84][85][86] over obstructions and vegetated bed scenarios. [87][88][89][90] The need to move beyond wall friction representation for energy losses is recognized in large scale models but alternatives remain in short supply. 18 Progress on these alternatives using a quadratic drag law is timely given the rapid advancements in water level measurements from space (to within 10 cm) 91 and the wealth of research on drag coefficients for different geometries as derived from steady-uniform flow.…”

Section: Conclusion and Broader Implicationsmentioning

confidence: 99%

The advancing wave front on a sloping channel covered by a rod canopy following an instantaneous dam break

Buono,

Katul,

Poggi

2024

Physics of Fluids

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The drag coefficient Cd for a rigid and uniformly distributed rod canopy covering a sloping channel following the instantaneous collapse of a dam was examined using flume experiments. The measurements included space x and time t high resolution images of the water surface h(x, t) for multiple channel bed slopes So and water depths behind the dam Ho along with drag estimates provided by sequential load cells. Using these data, an analysis of the Saint-Venant equation (SVE) for the front speed was conducted using the diffusive wave approximation. An inferred Cd=0.4 from the h(x, t) data near the advancing front region, also confirmed by load cell measurements, is much reduced relative to its independently measured steady-uniform flow case. This finding suggests that drag reduction mechanisms associated with transients and flow disturbances are more likely to play a dominant role when compared to conventional sheltering or blocking effects on Cd examined in uniform flow. The increased air volume entrained into the advancing wave front region as determined from an inflow–outflow volume balance partly explains the Cd reduction from unity.

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“…be solved by HLL solver which is developed by Harten, Lax and van Leer (1983). This solver has been widely used to solve shallow water problem in previous research, such as Caleffi et al (2003), Valiani et al (2002), Zhang et al (2016), andKhan (2018). The flux…”

Section: Appendix A: Numerical Solution Of the Kinematic Wave Equationmentioning

confidence: 99%

Kinematic wave solutions for dam-break floods in non-uniform valleys

Chen

Capart

2020

Journal of Hydrology

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In non-uniform valleys, dam-break flood waves can be significantly affected by downstream variations in river width, slope and roughness. To model these effects, we derive new analytical solutions to the kinematic wave equation, applicable to rating curves in the power law form and hydrographs of generic shape as long as they produce a single shock at the wave front. New results are first obtained for uniform channels, using the Gauss-Green theorem applied to characteristic-bounded regions of the ( , ) xt plane. The results are then extended to non-uniform valleys, using a change of variable that homogenizes river properties by rescaling the distance coordinate. The solutions are illustrated and validated for idealized cases, then applied to three historical dam failures: the 2008 breaching failure of the Tangjiashan landslide dam, the 1976 piping failure of Teton Dam, and the 1959 sudden failure of Malpasset Dam. In spite of the much reduced computational cost and data requirements, the results agree well with the field data and with more elaborate simulations.They also clarify how both river and hydrograph properties affect flood propagation and attenuation.

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Numerical simulation of flow and bed morphology in the case of dam break floods with vegetation effect

Cited by 16 publications

References 17 publications

Development of eco‐hydraulic model for assessing fish habitat and population status in freshwater ecosystems

Development of eco‐hydraulic model for assessing fish habitat and population status in freshwater ecosystems

The advancing wave front on a sloping channel covered by a rod canopy following an instantaneous dam break

Kinematic wave solutions for dam-break floods in non-uniform valleys

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