2D finite element pollutant transport model for accidental mass release in rivers

2009 ◽  
Vol 14 (1) ◽  
pp. 77-86 ◽  
Author(s):  
Myung Eun Lee ◽  
Il Won Seo
Keyword(s):  
Finite Element ◽  
Transport Model ◽  
Pollutant Transport ◽  
Mass Release

The measurement of groundwater temperature in shallow piezometers and standpipes

2005 ◽  
Vol 42 (5) ◽  
pp. 1377-1390 ◽  
Author(s):  
Matthew D Alexander ◽  
Kerry TB MacQuarrie
Keyword(s):  
Finite Element ◽  
Statistical Analysis ◽  
Transport Model ◽  
Shallow Groundwater ◽  
Subsurface Temperature ◽  
Groundwater Temperature ◽  
Monitoring Well ◽  
Laboratory Results ◽  
The Impact

Accurate measurements of in situ groundwater temperature are important in many groundwater investigations. Temperature is often measured in the subsurface using an access tube in the form of a piezometer or monitoring well. The impact of standpipe materials on the conduction of heat into the subsurface has not previously been examined. This paper reports on the results of a laboratory experiment and a field experiment designed to determine if different standpipe materials or monitoring instrument configurations preferentially conduct heat into the shallow sub surface. Simulations with a numerical model were also conducted for comparison to the laboratory results. Statistical analysis of the laboratory results demonstrates that common standpipe materials, such as steel and polyvinylchloride (PVC), do not affect temperature in the subsurface. Simulations with a finite element flow and heat transport model also confirm that the presence of access tube materials does not affect shallow groundwater temperature measurements. Field results show that different instrument configurations, such as piezometers and water and air filled and sealed well points, do not affect subsurface temperature measurements.Key words: groundwater temperature, temperature measurement, conduction, piezometers, piezometer standpipes, thermal modelling.

scholarly journals Finite element modeling of geothermal source of heat pump in long-term operation

2020 ◽  
Vol 154 ◽  
pp. 04003
Author(s):  
Elżbieta Hałaj
Keyword(s):  
Finite Element ◽  
Heat Source ◽  
Heat Pump ◽  
Heat Exchangers ◽  
Transport Model ◽  
Heat Pumps ◽  
Initial Temperature Distribution ◽  
Term Operation ◽  
Borehole Heat Exchangers

Heat pumps become more and more popular heat source. They can be an alternative choice for obsolete coal fired boilers which are emissive and not ecological. During heat pump installation designing process, especially for heat pumps with higher heating capacity (for example those suppling larger buildings), a simulation of heat balance of ground heat source must be provided. A 3D heat transport model and groundwater flow in the geothermal heat source for heat pump (GSHP) installation was developed in FEFLOW according to Finite Element Modelling Method. The model consists of 25 borehole heat exchangers, arranged with spacing recommended by heat pump branch guidelines. The model consists of both a homogeneous, non-layered domain and a layered domain, which reflected differences in thermal properties of the ground and hydrogeological factors. The initial temperature distribution in the ground was simulating according to conditions typical for Europe in steady state heat flow. Optimal mesh refinement for nodes around borehole heat exchangers were calculated according to Nillert method. The aim of this work is to present influence of geological, hydrogeological factors and borehole arrangement in the energy balance and long term sustainability of the ground source. The thermal changes in the subsurface have been determined for a long term operation (30 years of operation period). Some thermal energy storage applications have also been considered.

Étude de la réouverture de la lagune du Havre aux Basques. II. Modélisation numérique du processus de mélange des eaux

1995 ◽  
Vol 22 (1) ◽  
pp. 72-79
Author(s):  
A. Khelifa ◽  
Y. Ouellet ◽  
J.-L. Robert
Keyword(s):  
Finite Element ◽  
Numerical Model ◽  
Transport Model ◽  
Numerical Study ◽  
Time Discretization ◽  
Element Formulation ◽  
Modélisation Numérique ◽  
Advection Diffusion ◽  
Space Discretization ◽  
Triangular Elements

This paper, the second of a series, presents the results of a numerical study of the advection–diffusion water mixing process between the Havre aux Basques lagoon and the Gulf of St. Lawrence, after the proposed reopening of the lagoon. In this study, the reopening scheme of the inlet, which has been closed in 1957, is analyzed by using a horizontal two-dimensional numerical model. The transport model is based on the Douglas–Wang finite element formulation for a space discretization. The approximation is quadratic, using six-node triangular elements. The semi-implicit Crank–Nicholson scheme is used for a time discretization. The results show that after reopening the lagoon, mixing may take between 5 and 22 days for a diffusion coefficient considered constant throughout the region and varying from 5 to 500 m2/s. Key words: lagoon, Havre aux Basques, advection–diffusion, mixing, numerical model, finite element, Douglas–Wang.

scholarly journals Coastal modelling with a GIS bathymetric module

2013 ◽  
Vol 4 (1) ◽  
pp. 51-73
Keyword(s):  
3D Model ◽  
Transport Model ◽  
Pollutant Transport ◽  
Coastal Areas ◽  
Coastal Modelling ◽  
Rectangular Grids ◽  
Gis Environment ◽  
Arcview Gis

A 3D hydrodynamic/pollutant transport model was used to simulate the currents and pollutant transport in coastal areas. The bathymetric and shoreline data was provided to the model via a GIS module that operates in the ArcView GIS environment. The module is efficient and capable of generating bathymetric rectangular grids and shorelines of different resolution for open and closed boundary scenarios that can automatically be read by the coastal model. This ability could improve the basic patterns and relationships of the model such as grid dependency. The functionality of the 3D model with the GIS module is illustrated in a number of coastal areas in Greece.

Risk assessment using stochastic modeling of pollutant transport in landfill clay liners

1999 ◽  
Vol 39 (10-11) ◽  
pp. 337-341 ◽  
Author(s):  
Irene M.-C. Lo ◽  
Wendy K.-W. Law ◽  
Helen M. Shen
Keyword(s):  
Risk Assessment ◽  
Monte Carlo Simulation ◽  
Stochastic Modeling ◽  
Transport Model ◽  
Pollutant Transport ◽  
Design Parameters ◽  
Contaminant Concentration ◽  
Clay Liners ◽  
Clay Liner ◽  
Advection Dispersion

Risk assessment of landfil systems using Monte Carlo simulation in the prediction of groundwater contamination underneath a landfill insulated by clay liner is presented. The advantage of applying stochastic modeling is that uncertainties associated with various design parameters can be taken into account in the prediction of pollutant transport through the clay liner. A model based on a pollutant transport model considering advection, dispersion and sorption is developed in this study. The design parameters with their corresponding distribution forms are fed into the simulation model. The probability of the contaminant concentration in the groundwater underneath the landfill exceeding a predetermined value is used for risk assessment.

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