Research on Reservoir Outflow Impacting Reservoir Environmental Capacity

2012 ◽  
Vol 518-523 ◽  
pp. 4043-4046
Author(s):  
Fu Chun Zhou ◽  
Yu Yan Fan ◽  
Guo Dong Liu ◽  
Long Hui Zhang
Keyword(s):  
Fluid Dynamics ◽  
Water Quality ◽  
Computational Fluid Dynamics ◽  
Environmental Capacity ◽  
Reservoir Water ◽  
Reservoir Flow ◽  
Water Environmental Capacity ◽  
Relationship Of ◽  
The Relationship ◽  
Calculation Software

Reservoir outflow is an important factor not only impacting reservoir flow field, but also affecting reservoir water environmental capacity. This paper, taking a reservoir as an example, makes use of computational fluid dynamics and water quality calculation software calculating the reservoir outflow quality in different discharge width, and calculating the corresponding environmental capacity of the reservoir under different discharge width of the reservoir and the flow concentration. The relationship of the outflow width, outflow discharge and water environmental capacity is analyzed.

scholarly journals Water Supply-Water Environmental Capacity Nexus in a Saltwater Intrusion Area under Nonstationary Conditions

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 346
Author(s):  
Dedi Liu ◽  
Yujie Zeng ◽  
Yue Qin ◽  
Youjiang Shen ◽  
Jiayu Zhang
Keyword(s):  
Water Quality ◽  
Water Supply ◽  
Saltwater Intrusion ◽  
Water Environment ◽  
Environmental Capacity ◽  
Freshwater Flow ◽  
Environment Capacity ◽  
Water Environmental Capacity ◽  
Water Environment Capacity ◽  
Supply Water

Due to water supply increase and water quality deterioration, water resources are a critical problem in saltwater intrusion areas. In order to balance the relationship between water supply and water environment requirements, the nexus of water supply-water environment capacity should be well understood. Based on the Saint–Venant system of equations and the convection diffusion equation, the water supply-water environment capacity nexus physical equation is determined. Equivalent reliability is employed to estimate the boundary design water flow, which will then lead to a dynamic nexus. The framework for determining the nexus was then applied to a case study for the Pearl River Delta in China. The results indicate that the water supply-water environment capacity nexus is a declining linear relationship, which is different from the non-salt intrusion and tide-impacted areas. Water supply mainly relies on freshwater flow from upstream, while water environmental capacity is affected by both the design freshwater flow and the water levels at the downstream boundary. Our methods provide a useful framework for the quantification of the physical nexus according to the water quantity and water quality mechanisms, which are useful for freshwater allocation and management in a saltwater intrusion area or the tail area of cascade reservoirs.

Optimal Hardware Placement in a Minitower Computer Enclosure System

2011 ◽  
Author(s):  
M. Alfaro Cano ◽  
A. Hernandez-Guerrero ◽  
C. Rubio Arana ◽  
Aristotel Popescu
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Cfd Simulation ◽  
Operating Temperature ◽  
Optimal Placement ◽  
Cfd Analysis ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results ◽  
The Relationship ◽  
Key Questions

One of the requirements for existing personal computers, PCs, is that the hardware inside must maintain an operating temperature as low as possible. One way to achieve that is to place the hardware components at locations with enough airflow around it. However, the relationship between the airflow and temperature of the components is unknown before they are placed at specific locations inside a PC. In this work a Computational Fluid Dynamics (CFD) analysis is coupled to a Design of Experiment (DOE) methodology to answer typical minitower key questions: a) how do the possible positions of hardware components affect their temperature?, and b) is it possible to get an optimal placement for these hardware components using the data collected by the CFD simulation results? The DOE methodology is used to optimize the analysis for a very large number of possible configurations. The results help in identifying where the efforts need to be placed in order to optimize the positioning of the hardware components for similar configurations at the designing stage. Somehow the results show that general conclusions could be drawn, but that there are not specific rules that could be applied to every configuration.

Assessing the relationship of background factors governing the water quality of an agricultural watershed with changes in catchment property (W-Hungary)

2015 ◽  
Vol 521 ◽  
pp. 460-469 ◽  
Author(s):  
István Gábor Hatvani ◽  
József Kovács ◽  
László Márkus ◽  
Adrienne Clement ◽  
Richárd Hoffmann ◽  
...  
Keyword(s):  
Water Quality ◽  
Agricultural Watershed ◽  
Background Factors ◽  
Relationship Of ◽  
The Relationship

scholarly journals Research on water environmental capacity accounting of the Yongzhou Section of Xiangjiang River Basin based on the SWAT-EFDC coupling model

2021 ◽  
Author(s):  
Li Wu ◽  
Zhe Chen ◽  
Xuan Ding ◽  
Hui-ying Liu ◽  
Dun-qiu Wang
Keyword(s):  
Water Quality ◽  
River Basin ◽  
Total Nitrogen ◽  
Total Phosphorus ◽  
Coupling Model ◽  
Theoretical Formula ◽  
Environmental Capacity ◽  
Xiangjiang River ◽  
Water Environmental Capacity ◽  
Xiangjiang River Basin

Abstract In this paper, a coupling model of SWAT (Soil and Water Assessment Tool) and EFDC (Environmental Fluid Dynamics Code) was established, and the relationship between the pollution source and water quality response was identified. Based on the hydrodynamic water quality simulation results and the one-dimensional WEC (water environmental capacity) theoretical formula, the total nitrogen and total phosphorus WEC and the remaining WEC of the Yongzhou Section of Xiangjiang River Basin under the guaranteed rate of 90% and in 2017 were calculated, respectively. It can be seen from the results that the total nitrogen WEC of the Yongzhou Section of Xiangjiang River Basin in 2017 is 27,673.04 t, the total nitrogen WEC under the guaranteed rate of 90% is 19,497.61 t/a and the total phosphorus WEC of the Yongzhou Section of Xiangjiang River Basin in 2017 is 4,877.22 t. The total phosphorus WEC under the guaranteed rate of 90% is 2,936.64 t/a; in 2017, the remaining WECs of total nitrogen and total phosphorus in the entire basin are 14,646.69 and 3,358.67 t, respectively.

scholarly journals The role of health surveillance in the management of water quality in rural properties in seven municipalities of the Region of Paraná

2021 ◽  
Vol 17 (6) ◽  
Author(s):  
Tiago Vinicius Silva Athaydes ◽  
Jefferson de Queiroz Crispim ◽  
Mauro Parolin
Keyword(s):  
Water Quality ◽  
Rural Areas ◽  
Urban Areas ◽  
Contaminated Water ◽  
Regional Office ◽  
Main Partner ◽  
Relationship Of ◽  
The Relationship ◽  
Structured Questionnaire

Sanitation in rural areas in Brazil is still very precarious, with deficits greater than in urban areas. In this sense, the central objective of this research is to evaluate the role of the Municipal Surveillance in the management of water quality in rural properties in the Midwestern region of Paraná, covering the beginning of the monitoring of water quality, the relationship of the Consolidation Ordinance No. 5 of 2017 of the Ministry of Health regarding the choices of parameters on potability indices in relation to the parameters analyzed in the Surveillance, the presence of outbreaks due to diseases arising from the consumption of contaminated water, the demand by residents and the partners who contribute to the realization of these activities. The data were obtained through the application of a semi-structured questionnaire, through the 11th Health Regional Office of Campo Mourão. It was presented that the municipalities have acted in the monitoring of water quality in an uneven way at the beginning of the activities, following the parameters of the Ordinance. The municipalities had demands and demands from residents and counted on the 11th Health Regional Office as the main partner in the monitoring support. Only Iretama presented an outbreak due to the consumption of contaminated water.

scholarly journals The relationship between coronary stenosis morphology and fractional flow reserve: a computational fluid dynamics modelling study

2021 ◽  
Author(s):  
Roberto T F Newcombe ◽  
Rebecca C Gosling ◽  
Vignesh Rammohan ◽  
Patricia V Lawford ◽  
D Rodney Hose ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Coronary Artery ◽  
Fractional Flow Reserve ◽  
Computational Modelling ◽  
Fractional Flow ◽  
Cfd Modelling ◽  
Flow Reserve ◽  
The Relationship ◽  
Lesion Severity

Abstract Background International guidelines mandate the use of fractional flow reserve (FFR) and/or non-hyperaemic pressure ratios to assess the physiological significance of moderate coronary artery lesions to guide revascularisation decisions. However, they remain underused such that visual estimation of lesion severity continues to be the predominant decision-making tool. It would be pragmatic to have an improved understanding of the relationship between lesion morphology and haemodynamics. Aims To compute virtual FFR (vFFR) in idealised coronary artery geometries with a variety of stenosis and vessel characteristics Methods Coronary artery geometries were modelled, based upon physiologically realistic branched arteries. Common stenosis characteristics were studied, including % narrowing, length, eccentricity, shape, number, position relative to branch, and distal (myocardial) resistance. Computational fluid dynamics (CFD) modelling was used to calculate vFFRs using the VIRTUheartTM system. Results Percentage lesion severity had the greatest effect upon FFR. Any ≥80% diameter stenosis in two views (i.e. concentric) was physiologically significant (FFR ≤ 0.80), irrespective of length, shape or vessel diameter. Almost all eccentric stenoses and all 50% concentric stenoses were physiologically non-significant, whilst 70% uniform concentric stenoses about 10mm long straddled the ischaemic threshold (FFR 0.80). A low microvascular resistance (MVR) reduced FFR on average by 0.05, and a high MVR increased it by 0.03. Conclusions Using computational modelling, we have produced an analysis of virtual FFR that relates stenosis characteristics to haemodynamic significance. The strongest predictor of a positive virtual FFR was a concentric, ≥80% diameter stenosis. The importance of MVR was quantified. Other lesion characteristics have a limited impact.

scholarly journals ASSESSMENT OF SEAGRASS PERCENT COVER AND WATER QUALITY USING UAV IMAGES AND FIELD MEASUREMENTS IN BOLINAO, PANGASINAN

2019 ◽  
Vol XLII-4/W19 ◽  
pp. 233-240
Author(s):  
M. K. M. R. Guerrero ◽  
J. A. M. Vivar ◽  
R. V. Ramos ◽  
A. M. Tamondong
Keyword(s):  
Water Quality ◽  
Regression Analysis ◽  
Chlorophyll A ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Support Vector ◽  
Percent Cover ◽  
Chl A ◽  
Relationship Of ◽  
The Relationship

Abstract. The sensitivity to changes in water quality inherent to seagrass communities makes them vital for determining the overall health of the coastal ecosystem. Numerous efforts including community-based coastal resource management, conservation and rehabilitation plans are currently undertaken to protect these marine species. In this study, the relationship of water quality parameters, specifically chlorophyll-a (chl-a) and turbidity, with seagrass percent cover is assessed quantitatively. Support Vector Machine, a pixel-based image classification method, is applied to determine seagrass and non-seagrass areas from the orthomosaic which yielded a 91.0369% accuracy. In-situ measurements of chl-a and turbidity are acquired using an infinity-CLW water quality sensor. Geostatistical techniques are utilized in this study to determine accurate surfaces for chl-a and turbidity. In two hundred interpolation tests for both chl-a and turbidity, Simple Kriging (Gaussian-model type and Smooth- neighborhood type) performs best with Mean Prediction equal to −0.1371 FTU and 0.0061 μg/L, Root Mean Square Standardized error equal to −0.0688 FTU and −0.0048 μg/L, RMS error of 8.7699 FTU and 1.8006 μg/L and Average Standard Error equal to 10.8360 FTU and 1.6726 μg/L. Zones are determined using fishnet tool and Moran’s I to calculate for the seagrass percent cover. Ordinary Least Squares (OLS) is used as a regression analysis to quantify the relationship of seagrass percent cover and water quality parameters. The regression analysis result indicates that turbidity has an inverse relationship while chlorophyll-a has a direct relationship with seagrass percent cover.

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