Analysis of groundwater flow and travel times for a landfill site in an arid region with a thick vadose zone

S, Lee; Kitanidis, Peter K.

doi:10.1002/hyp.3360070404

Cited by 8 publications

(2 citation statements)

References 6 publications

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“…Equation (1) can be used to calculate mean age within a small volume from a particle-tracking analysis to include, for example, the mixing induced by sampling. The methods presented here for age simulation also may be useful in accounting for the effects of dispersion and mixing on other analyses involving groundwater and travel time, such as contamination from landfills [Lee and Kitanidis, 1993 under mixing in constant-density water. This analog can be exploited to derive a governing transport equation for mean age.…”

Section: Derivation Of Mean Age Transport Equationmentioning

confidence: 99%

Direct Simulation of Groundwater Age

Goode¹

1996

Water Resources Research

301

340

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Abstract. A new method is proposed to simulate groundwater age directly, by use of an advection-dispersion transport equation with a distributed zero-order source of unit (1) strength, corresponding to the rate of aging. The dependent variable in the governing equation is the mean age, a mass-weighted average age. The governing equation is derived from residence-time-distribution concepts for the case of steady flow. For the more general case of transient flow, a transient governing equation for age is derived from mass-conservation principles applied to conceptual "age mass." The age mass is the product of the water mass and its age, and age mass is assumed to be conserved during mixing. Boundary conditions include zero age mass flux across all noflow and inflow boundaries and no age mass dispersive flux across outflow boundaries. For transient-flow conditions, the initial distribution of age must be known. The solution of the governing transport equation yields the spatial distribution of the mean groundwater age and includes diffusion, dispersion, mixing, and exchange processes that typically are considered only through tracer-specific solute transport simulation. Traditional methods have relied on advective transport to predict point values of groundwater travel time and age. The proposed method retains the simplicity and tracer-independence of advection-only models, but incorporates the effects of dispersion and mixing on volume-averaged age. Example simulations of age in two idealized regional aquifer systems, one homogeneous and the other layered, demonstrate the agreement between the proposed method and traditional particle-tracking approaches and illustrate use of the proposed method to determine the effects of diffusion, dispersion, and mixing on groundwater age.

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Section: Derivation Of Mean Age Transport Equationmentioning

confidence: 99%

Direct Simulation of Groundwater Age

Goode¹

1996

Water Resources Research

301

340

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“…The characteristics of leachate vary greatly depending on the processes that occur in the landfill, which can be physical, chemical and biological. The type of waste, site design, geochemistry, climatological conditions, and hydrogeology affect the leachate migration to groundwater (Lee and Kitanidis, 1993). The leachate produced from materials that often contain toxic substances can be the greatest threat to groundwater pollution, especially if industrial waste is dumped on the land (Longe and Balogun, 2010).…”

Section: Leachatementioning

confidence: 99%

Shallow Groundwater Pollution Index Around the Location of Griyo Mulyo Landfill (Jabon Landfill) in Jabon District, Sidoarjo Regency, East Java, Indonesia

Tangahu¹,

Kartika²,

Sambodho³

et al. 2021

J. Ecol. Eng.

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The leachate coming from the landfill is a serious problem. This is because the leachate water can contaminate the wells of the residents around the landfill. This research was conducted at Jabon Landfill located in Jabon District of Sidoarjo Regency, East Java Province, Indonesia. Jabon Landfill has been operating since 2003 with a controlled landfill system that has triggered environmental risks due to the leachate output. The purpose of this study was to determine the classification of the shallow groundwater quality status based on the pollution index (PI) around Jabon Landfill at a distance of around 250 meters, 500 meters and 1,000 meters from the landfill. The pollution index was determined by analyzing the pollutant concentration consisting of these following parameters: pH, BOD, COD and Fe. The results of the analysis show that the pH parameter had a higher value than the pH at Jabon Landfill of 7.2-7.5. The pH at Jabon Landfill was 6.35. The Fe parameter shows that the value of 1.694 in the groundwater well closest to Jabon Landfill and the wells further away indicates that the Fe concentration was lower for the latter, namely 0.081 at a distance of up to 200 meters. On the basis of the Pollution Index, the highest value was 5.45 at Well 7 is located 196 m from Jabon Landfill. Meanwhile, the well furthest from Jabon Landfill at a distance of 1,000 m showed a lightly polluted status with a Pollution Index of 1.91. The further the location of the well away from Jabon Landfill, the Pollution Index value tended to decrease. This means that the pollution status generally improves. Overall, the pollution status of the 18 wells shows that 2 wells are moderately polluted, 15 wells are lightly polluted and 1 well is in good condition.

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