Simple analytical models for interpretation of environmental tracer profiles in the vadose zone

Joshi, Bhaskar; Maulé, Charles

doi:10.1002/1099-1085(20000615)14:8<1503::aid-hyp990>3.0.co;2-z

Cited by 16 publications

(11 citation statements)

References 21 publications

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“…Therefore, we defined the active root zone as extending from the soil surface to 1‐m depth for this location. The active root zone of 1.0 m is close to what is reported in the literature in the Canadian Prairies (Lehane and Staple, 1965; de Jong and Rennie, 1969; Campbell et al, 1975; Joshi and Maule, 2000; Dyck et al, 2003).…”

Section: Resultssupporting

confidence: 83%

“…Recharge rates calculated using the diff erential method do not depend on the defi ned thickness of the active root zone (Joshi and Maule, 2000). Figure 3 shows the depth distribution of soil water content for diff erent dates.…”

Section: Methodsmentioning

confidence: 99%

“…Then, the recharge rate was calculated as the product of pore water velocity and the average soil water content between the two peak depths. Recharge rates calculated using the differential method do not depend on the defined thickness of the active root zone (Joshi and Maule, 2000).…”

Section: Methodsmentioning

confidence: 99%

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Determining Long‐Term (Decadal) Deep Drainage Rate Using Multiple Tracers

Cheng

Jong

2007

J of Env Quality

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The deep drainage rate is a critical hydrological parameter in understanding contamination mechanisms of soil and groundwater. Little research has been conducted on the temporal variations in deep drainage rate during the last century. The objective of this study was to determine the long-term deep drainage rate on a cultivated loamy soil in the Canadian Prairies. Three tracers were used: KCl applied in 1971, fallout tritium in 1963, and NO3* released during the initial cultivation of the field (1923). Two soil cores to a depth of 3.6 m were taken along a flat portion of the field, and soil Cl(-), 3H, and NO3* concentrations were measured as a function of depth. An additional four cores were taken for soil water content measurements between 2000 and 2003. Distinct peaks in the depth distribution of these three tracers were located at 1.27 m for Cl(-), 1.31 m for 3H, and 1.52 m for NO3*, 32, 40, and 80 yr after the application of Cl(-), 3H, and NO3*, respectively. The average deep drainage rates, calculated as the product of the estimated tracer velocity and volumetric soil water content below the active root zone, were 2.0 mm yr(-1) from the Cl(-) tracer, 2.2 mm yr(-1) from 3H, and 2.5 mm yr(-1) from the NO3* tracer. Therefore, there was little temporal variability in the groundwater recharge over the eight decades that the field has been cultivated. The recharge rates are less than 1% of the mean annual precipitation (333 mm).

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Section: Resultssupporting

confidence: 83%

Section: Methodsmentioning

confidence: 99%

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Determining Long‐Term (Decadal) Deep Drainage Rate Using Multiple Tracers

Cheng

Jong

2007

J of Env Quality

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“…This approach, based on the most representative velocity of tracer transfer and called the peak-migration method by Joshi and Maulé (2000), yields a mean solute transfer velocity of 2.8 and 2.7 mm per mm of daily percolation flux in the first 2.5 m below soil surface for deuterium and bromide, respectively. Since cumulative daily percolation flux was 1056 and 812 mm during the year following the tracer application for the deuterium and the bromide experiments, respectively, this yields a mean velocity of displacement of 2.5 m per year.…”

Section: Chemistrymentioning

confidence: 99%

Solute transfer in the unsaturated zone-groundwater continuum of a headwater catchment

Legoût

Molénat

Aquilina

et al. 2007

Journal of Hydrology

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“…The principles are shown in Figure 2. After a certain period of time, samples are collected to monitor the change of tracer concentration in the section, and then the groundwater recharge rate is calculated by observing the downward movement of the tracer peak with the following equation [33] …”

Section: Introductionmentioning

confidence: 99%

Research on Characteristics of Groundwater Recharge in the Weishan Irrigated District Based on a Bromide Tracer

Cong

Wang

2018

Water

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Abstract:Bromide was used as tracer in the Weishan Irrigated District to determine the groundwater recharge as well as to evaluate the impacts of different irrigation basin locations, irrigation regimes, and crop types on the recharge. The comprehensive recharge coefficient and the Kriging Spatial Interpolation methods were used to distinguish the effects of precipitation and surface water irrigation on the groundwater recharge rate. The results show that the recharge rates ranged from 85.8 to 243 mm/a, with an average of 168 mm/a. The average recharge rate in the upstream district is greater in the downstream and the average recharge rate of irrigated land (193 mm/a) is greater than non-irrigated land (110 mm/a). The recharge rates in fields of winter wheat-summer maize and cotton with irrigation are 210 mm/a and 140 mm/a, respectively, while they are 115 mm/a and 94.1 mm/a under no irrigation conditions. The comprehensive recharge coefficient of groundwater in the upstream irrigation area is larger than that in the downstream. By comparing the spatial distribution of the groundwater level and the comprehensive recharge coefficient, it is found that there is a positive relationship between the groundwater level and the comprehensive recharge coefficient. The results of this study can provide reference and guidance to a water resources analysis of the Weishan Irrigated District.

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Simple analytical models for interpretation of environmental tracer profiles in the vadose zone

Cited by 16 publications

References 21 publications

Determining Long‐Term (Decadal) Deep Drainage Rate Using Multiple Tracers

Determining Long‐Term (Decadal) Deep Drainage Rate Using Multiple Tracers

Solute transfer in the unsaturated zone-groundwater continuum of a headwater catchment

Research on Characteristics of Groundwater Recharge in the Weishan Irrigated District Based on a Bromide Tracer

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