Comparison and analysis of calculation of Bridge backwater based on Mike21 hydrodynamic model

Liu, Jiang Chuan; Hu, Zhu Qiu; Zhu, Mao Yuan

doi:10.1051/e3sconf/202123303043

Cited by 2 publications

(2 citation statements)

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“…The water dynamics module includes a continuity equation and momentum equation, which are expressed as below [20].…”

Section: On-site Monitoring and Data Collectionmentioning

confidence: 99%

Simulation Study on the Impact of Water Flow Regulation Based on the MIKE 21 Model in a River Water Environment

Xu,

Ren,

Huang

et al. 2023

Sustainability

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Inadequate hydrodynamics can cause deterioration of the water environment within rivers. Regulating water conservancy projects can effectively improve the state of the water environment of rivers and promote sustainable regional development. The river plain in Zhejiang Province, China, suffers from severe hydrodynamic deficiencies, which have a significant impact on the state of the regional water environment. To investigate the changing state of the water environment of the river plain under water conservancy project control, in this study we constructed a two-dimensional hydrodynamic–water quality model based on the AD and ECOLAB modules in MIKE 21 software 2014 Edition. Combined with conservative tracers, the changes in the water displacement rate, flow rate, and water environment quality of the river plain were simulated under different regulation schemes over 7 days. A quantitative analysis of the effects of improving the state of the water environment in the river plain was carried out using a cluster analysis and a cloud model. (1) The water replacement rate of the outer river reached 90% after 3 days and approached 100% after 7 days. The water replacement rates of the inner pond were 51.2, 49.6, and 55.8%. This indicated that the engineering control measures effectively improved the replacement capacity of the river. (2) The contents of DO and BOD5 in the river have increased from class V to above class 3. The overall water quality is in the range of classes 2 to 3, and in some parts it can reach class 1. This indicates that the regulatory plan played a certain role in improving the river water environment. (3) The water pollution in the study area showed a fluctuating and decreasing trend over 7 days. There was a positive correlation between the flow velocity, water replacement rate, DO, and BOD5.

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“…The water dynamics module includes a continuity equation and momentum equation, which are expressed as below [20].…”

Section: On-site Monitoring and Data Collectionmentioning

confidence: 99%

Simulation Study on the Impact of Water Flow Regulation Based on the MIKE 21 Model in a River Water Environment

Xu,

Ren,

Huang

et al. 2023

Sustainability

View full text Add to dashboard Cite

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“…The two-dimensional water-quality model uses two-dimensional shallow water equations to calculate the flow of water bodies based on the Riemann approximation solution method and explains the principles of pollutant dispersion, using the finite volume method to describe the phenomenon of pollutant degradation and dispersion in water bodies [23].…”

Section: Water-quality Modelsmentioning

confidence: 99%

Simulation Study on the Impact of South–North Water Transfer Central Line Recharge on the Water Environment of Bai River

Zhang

Zheng

et al. 2023

Water

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To effectively improve the water quality of the Bai River, this paper proposes the use of the ecological replenishment of the South–North Water Transfer as a measure for the integrated allocation of water resources, addressing the impact of complex topography, climate, and human disturbances on the river’s water environment. This measure can alleviate the problem of water shortage and significantly enhance the quality of the Bai River’s water environment. Using the MIKE21 coupled hydrodynamic and water-quality model, this paper analyzes the impact of ecological recharge on river hydrodynamics and simulates the evolution of various water-quality indicators, including dissolved oxygen (DO), permanganate index (CODMn), chemical oxygen demand (COD), ammonia nitrogen (NH3-N), and total phosphorus (TP) under different scenarios. The aim of this paper is to investigate the impact mechanism of ecological recharge on the river’s water environment. The results show that the most significant improvement in river water quality is achieved when the recharge flow is 2Q and the recharge duration is 1/2T (scenario 1), with the river improving from a grade IV water-quality standard to a grade III water-quality standard, and COD and TP indicators improving to a grade II water standard, with the largest improvement rate of 94.67% seen in DO, with the best improvement rate of 94.67% in DO indicators and the best reduction rate of 66.67% in TP indicators. Overall, ecological replenishment can significantly improve the Bai River’s water quality, with scenario 1 being the most effective approach. The results of this study may provide theoretical and technical support for the future management of river water environments.

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Comparison and analysis of calculation of Bridge backwater based on Mike21 hydrodynamic model

Cited by 2 publications

References 0 publications

Simulation Study on the Impact of Water Flow Regulation Based on the MIKE 21 Model in a River Water Environment

Simulation Study on the Impact of Water Flow Regulation Based on the MIKE 21 Model in a River Water Environment

Simulation Study on the Impact of South–North Water Transfer Central Line Recharge on the Water Environment of Bai River

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