scholarly journals Fate and transport modelling framework for assessing risks to soil and groundwater from chemicals accidentally released during surface operations: An Australian example application from shale gas developments

2022 ◽  
Vol 604 ◽  
pp. 127271
Author(s):  
Dirk Mallants ◽  
Rebecca Doble ◽  
Yousef Beiraghdar
Keyword(s):  
Shale Gas ◽  
Fate And Transport ◽  
Transport Modelling ◽  
Modelling Framework

scholarly journals A Generic Method for Predicting Environmental Concentrations of Hydraulic Fracturing Chemicals in Soil and Shallow Groundwater

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 941 ◽  
Author(s):  
Dirk Mallants ◽  
Elise Bekele ◽  
Wolfgang Schmid ◽  
Konrad Miotlinski ◽  
Andrew Taylor ◽  
...  
Keyword(s):  
Coal Seam ◽  
Hydraulic Fracturing ◽  
Shallow Groundwater ◽  
Solute Concentration ◽  
Coal Seam Gas ◽  
Transport Modelling ◽  
Environmental Concentrations ◽  
Modelling Framework ◽  
Recharge Rates ◽  
Migration Pathways

Source-pathway-receptor analyses involving solute migration pathways through soil and shallow groundwater are typically undertaken to assess how people and the environment could come into contact with chemicals associated with coal seam gas operations. For the potential short-term and long-term release of coal seam gas fluids from storage ponds, solute concentration and dilution factors have been calculated using a water flow and solute transport modelling framework for an unsaturated zone-shallow groundwater system. Uncertainty about dilution factors was quantified for a range of system parameters: (i) leakage rates from storage ponds combined with recharge rates, (ii) a broad combination of soil and groundwater properties, and (iii) a series of increasing travel distances through soil and groundwater. Calculated dilution factors in the soil increased from sand to loam soil and increased with an increasing recharge rate, while dilution decreased for a decreasing leak rate and leak duration. In groundwater, dilution factors increase with increasing aquifer hydraulic conductivity and riverbed conductance. For a hypothetical leak duration of three years, the combined soil and groundwater dilution factors are larger than 6980 for more than 99.97% of bores that are likely to be farther than 100 m from the source. Dilution factors were more sensitive to uncertainty in leak rates than recharge rates. Based on this dilution factor, a comparison of groundwater predicted environmental concentrations and predicted no-effect concentrations for a subset of hydraulic fracturing chemicals used in Australia revealed that for all but two of the evaluated chemicals the estimated groundwater concentration (for a hypothetical water bore at 100 m from the solute source) is smaller than the no-effect concentration for the protection of aquatic ecosystems.

Importance of DOC in sediments for contaminant transport modelling

1998 ◽  
Vol 38 (11) ◽  
pp. 193-199
Author(s):  
Byung-Gi Hwang ◽  
Kwan-Soo Jun ◽  
Young-Dae Lee ◽  
Wu-Seng Lung
Keyword(s):  
Contaminant Transport ◽  
Transport Model ◽  
Fate And Transport ◽  
Modeling Framework ◽  
Transport Modelling ◽  
Phase Partitioning ◽  
Three Phase ◽  
New Bedford Harbor ◽  
Interstitial Waters ◽  
Diffusive Exchange

Contaminants in the interstitial waters are not only dissolved but also associated with a filterable colloidal phase such as DOC. The DOC plays an important role regulating the distribution of chemicals between particulate and dissolved phases since it binds chemicals and makes them unavailable for vertical diffusive exchange. A three-phase partitioning model that consists of free-dissolved, DOC-bound, particulate-bound components of the chemicals involved is used for the contaminant transport model in order to include the effect of DOC on the partition coefficient. The contaminant model is linked to WASP modeling framework to predict remobilization of PCBs in sediments and the fate and transport of the contaminant in overlying waters of the New Bedford Harbor where the harbor has been contaminated with PCBs and heavy metals released from electronic capacitor manufacturers. Simulation of remedial controls indicates that if no action is taken, PCB concentrations will continue to be at elevated levels. Several scenarios for the removal of contaminated sediments have been performed to reduce the elevated PCB concentrations to background levels.

scholarly journals A simple contaminant fate and transport modelling tool for management and risk assessment of groundwater pollution from contaminated sites

2019 ◽  
Vol 221 ◽  
pp. 35-49 ◽  
Author(s):  
Luca Locatelli ◽  
Philip J. Binning ◽  
Xavier Sanchez-Vila ◽  
Gitte Lemming Søndergaard ◽  
Louise Rosenberg ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Groundwater Pollution ◽  
Fate And Transport ◽  
Contaminated Sites ◽  
Contaminant Fate ◽  
Transport Modelling ◽  
Contaminant Fate And Transport

scholarly journals Metals fate and transport modelling in streams and watersheds: state of the science and USEPA workshop review

2008 ◽  
Vol 22 (19) ◽  
pp. 4011-4021 ◽  
Author(s):  
B. S. Caruso ◽  
T. J. Cox ◽  
R. L. Runkel ◽  
M. L. Velleux ◽  
K. E. Bencala ◽  
...  
Keyword(s):  
Fate And Transport ◽  
Transport Modelling ◽  
State Of The Science

scholarly journals The Colombian Strategic Freight Transport Model Based on Product Analysis

2014 ◽  
Vol 26 (6) ◽  
pp. 487-496 ◽  
Author(s):  
Victor Cantillo ◽  
Miguel Jaller ◽  
Jose Holguín-Veras
Keyword(s):  
Transport Model ◽  
Freight Transport ◽  
Product Analysis ◽  
Transport Modelling ◽  
Modelling Framework ◽  
Proposed Model ◽  
Data Limitations ◽  
Relevant Variables ◽  
Freight Modelling

Freight transport modelling at interregional scale is relevant for planning issues. However, freight modelling processes are complex because it is not easy to define the relevant variables in the analysis, and to obtain the required information on freight movements through the network. These facts raise the need to adapt the modelling framework to each context.This paper proposes a strategic national freight transport modelling framework developed as a variant of the traditional four-step modelling process with additional steps to estimate traffic flows from freight flows and to consider empty trips. The country of Colombia is used as the case study to implement and calibrate the proposed model. The data, data sources, and modelling methodologies used for each step are explained. In addition, data limitations and measures taken to complement the available data are discussed. From the implementation, the authors identify a set of advantages derived from the modelling approaches considered and suggestions for improvement.

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