Influence of Regolith Properties on Migration of Septic Tank Effluent

Rea, Raymond A.; Upchurch, Sam B.

doi:10.1111/j.1745-6584.1980.tb03379.x

Cited by 15 publications

(8 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the case shown here, heterogeneities in the immediate vicinity of the input zone lead to bifurcation. Bifurcation of contaminant plumes has been reported in several detailed field studies [Childs et al, 1974;$udicky, 1979;Rea and Upchurch, 1980]. Although observed less frequently, single plumes did form in some realizations.…”

Section: Examples Of Contaminant Behaviormentioning

confidence: 78%

mass transport: 2. Analysis of uncertainty in prediction

Smith¹,

Schwartz²

1981

Water Resources Research

125

View full text Add to dashboard Cite

The first paper in this series presented a description of a stochastic modeling concept for mass transport. In this paper we extend that analysis to consider a more realistic set of. transport conditions in a groundwater basin with geologic layering, hydraulic anisotropy, spatial variations in porosity, and geochemical retardation. Uncertainties in transport predictions can be characterized by frequency distributions formed on the time of arrival of mass at the water table, on the exit location, and on the quantity of mass arriving at the water table as a function of time. Results show that transport is highly sensitive to porous medium heterogeneities. Considerable uncertainty is possible in predicting the spatial and temporal distribution of mass. Porous medium parameters capable of changing both the magnitude and direction of advective transport are of primary importance in influencing predictive ability. Most important in this respect are the arrangement of units with different mean hydraulic conductivities, the standard deviation and spatial continuity of hydraulic conductivity, and the hydraulic anisotropy. In certain geologic systems, patterns of contaminant migration can be predicted with more certainty. Features such as layering and hydraulic anisotropism can constrain the flow of mass to specific directions, thus limiting the size of the region through which mass is likely to spread. Depending upon the relative time scales of the release function and the transport process, lack of information about the timing and concentrations added at the source may cause greater uncertainty than the heterogeneity. 1979] there now are sets of mathematical tools to tackle this problem.

show abstract

Section: Examples Of Contaminant Behaviormentioning

confidence: 78%

mass transport: 2. Analysis of uncertainty in prediction

Smith¹,

Schwartz²

1981

Water Resources Research

125

View full text Add to dashboard Cite

show abstract

“…These factors have previously been described and their effects are explained further in the discussion (Rea and Upchurch, 1980). …”

Section: Sensitivity Analysismentioning

confidence: 88%

An Extended Environmental Multimedia Modeling System (EEMMS) for Landfill Case Studies

Chen¹,

Yuan²

2009

Environmental Forensics

View full text Add to dashboard Cite

“…Rea and Upchurch 1980;Lee et al 1980;Chen 1988;Robertson et al 1991;Ptacek 1998;Verstraeten et al 2005, etc.). Water samples may be analyzed for a number of parameters, including electrical conductivity (EC) and nutrient concentrations, to detect the influence of wastewater.…”

Section: Introductionmentioning

confidence: 93%

Non-intrusive characterization methods for wastewater-affected groundwater plumes discharging to an alpine lake

Roy

Robillard

Watson

2008

Environ Monit Assess

View full text Add to dashboard Cite

Streams and lakes in rocky environments are especially susceptible to nutrient loading from wastewater-affected groundwater plumes. However, the use of invasive techniques such as drilling wells, installing piezometers or seepage meters, to detect and characterize these plumes can be prohibitive. In this work, we report on the use of four non-intrusive methods for this purpose at a site in the Rocky Mountains. The methods included non-invasive geophysical surveys of subsurface electrical conductivity (EC), in-situ EC measurement of discharging groundwater at the lake-sediment interface, shoreline water sampling and nutrient analysis, and shoreline periphyton sampling and analysis of biomass and taxa relative abundance. The geophysical surveys were able to detect and delineate two high-EC plumes, with capacitively coupled ERI (OhmMapper) providing detailed two-dimensional images. In situ measurements at the suspected discharge locations confirmed the presence of high-EC water in the two plumes and corroborated their spatial extent. The nutrient and periphyton results showed that only one of the two high-EC plumes posed a current eutrophication threat, with elevated nitrogen and phosphorus levels, high localized periphyton biomass and major shifts in taxonomic composition to taxa that are commonly associated with anthropogenic nutrient loading. This study highlights the need to use non-intrusive methods in combination, with geophysical and water EC-based methods used for initial detection of wastewater-affected groundwater plumes, and nutrient or periphyton sampling used to characterize their ecological effects.

show abstract

Influence of Regolith Properties on Migration of Septic Tank Effluent

Cited by 15 publications

References 11 publications

mass transport: 2. Analysis of uncertainty in prediction

mass transport: 2. Analysis of uncertainty in prediction

An Extended Environmental Multimedia Modeling System (EEMMS) for Landfill Case Studies

Non-intrusive characterization methods for wastewater-affected groundwater plumes discharging to an alpine lake

Contact Info

Product

Resources

About