Evaluating Pesticide Fate and Transport: II. Mass Balance and Tracking

1998 ◽  
pp. 225-237
Author(s):  
M. R. Barrett ◽  
L. Liu ◽  
H. P. Nelson ◽  
N. C. Thurman ◽  
J. A. Hetrick ◽  
...  
Keyword(s):  
Mass Balance ◽  
Fate And Transport

Numerical modeling of non-aqueous phase liquids (NAPL) using lumped kinetic parameter approach

2020 ◽  
Author(s):  
Hee Sun Moon ◽  
Dong Hwi Lee ◽  
Jin Chul Joo
Keyword(s):  
Numerical Modeling ◽  
Kinetic Parameter ◽  
Mass Balance ◽  
Aqueous Phase ◽  
Vadose Zone ◽  
Fate And Transport ◽  
Mean Value ◽  
The Mean ◽  
Parameter Approach ◽  
Balance Error

<p>The spill of petroleum-derived contaminants, commonly referred to non-aqueous phase liquids (NAPL), in the subsurface can generate widespread contamination throughout infiltration into the subsoil, and partitioning into one or more phases (gaseous, dissolved, free NAPL, residual NAPL, and entrapped NAPL). Since the movement of NAPL through the vadose zone and saturated zone involves various processes and is affected by many factors, numerical modeling of fate and transport of NAPL including the characteristics of the porous media, the properties of NAPL, as well as the estimation of spilled volume and its distribution in heterogeneous subsurface systems is very complex. Thus, in this study, numerical modeling of NAPL using lumped kinetic parameter approach representing the mean value over the representative elementary volume were evaluated for multicomponent components in NAPL. Modeling predictions with lumped kinetic parameter approach for multicomponent components were validated by comparing to those with literature kinetic parameter for single component. From the results, numerical modeling of NAPL using lumped kinetic parameter approach can predict the multicomponent fate and transport with minimum mass balance error in some cases. Those mass balance errors were clearly dependent on the composition and mole fractions of NAPL, and mass transfer for the soluble compounds under conditions of low NAPL saturation is rate-limited. However, numerical modeling of NAPL using lumped kinetic parameter approach can provide rough insight on fate and transport of multicomponent components in NAPL with reduced effort and time without the need of kinetic and interaction parameters of all components in NAPL. </p>

Evaluation of Nutrients Mass Balance on the Weirs in the Mid-lower Nakdong River Basin

2020 ◽  
Vol 42 (5) ◽  
pp. 406-414
Author(s):  
Seoung-Muk Park ◽  
Yong-Eun Joo ◽  
Byung-Hyun Moon ◽  
Byung-Dae Lee ◽  
Shun-Hwa Lee
Keyword(s):  
Mass Balance ◽  
River Basin ◽  
Nakdong River ◽  
Nakdong River Basin
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