unsaturated zone


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unsaturated zone

[¦ən′sach·ə‚rād·əd ′zōn]
(geology)
References in periodicals archive ?
The [delta][sup.18]O and [delta][sup.2]H values (Table 4), plotted in Figure 12 in relation to the Global Meteoric Water Line (GMWL: [delta][sup.2]H = 8[delta]18O + 10) [34] and the Regional Meteoric Water Line of Sfax, Tunisia (SMWL: [delta][sup.2]H = 8[delta][sup.18]O + 13.5) [35, 36], show that most of the groundwater samples are located below the GMWL and near the SMWL which indicates water evaporation in the unsaturated zone. Therefore, groundwater isotopic enrichment might be the outcome from evaporation of recent precipitation.
Soil layers above the water table are termed as the unsaturated zone. In geotechnical engineering, pore water pressure fluctuation reduces soil suction which may cause soil failure.
It appears that free face can accelerate the horizontal movement of wetting front in unsaturated zone.
Their solution also handled the infiltration from the unsaturated zone to water table.
Vertical percolation of precipitation down to the saturated zone is variable in the space of the study area, due to the variability in the clay content which limits the vertical hydraulic conductivity of the material of the unsaturated zone. Where the clay content is high, vertical percolation is significantly restricted, and the resulting recharged groundwater is significantly enriched due to evaporative effects of high temperatures and low humidities.
coli within 30 cm of unsaturated zone, this was deemed a treatment failure.
The scheme of hysteretic flow in this paper deals with numerical solutions of the mixed Richards equation to simulate hysteretic transient flow in the unsaturated zone.
If the water in the unsaturated zone comes into contact with even a slight amount of carbonate, the water will be buffered to a pH close to 7 and Al will be immobilized.
The set of variables that are considered for the DRASTIC model can be grouped according to three main categories: land surface factors, unsaturated zone factors and aquifer or saturated zone factors.
The oxygen diffusion rate in the unsaturated zone is high, relative to the saturated zone, since the oxygen diffusion rate is 10000 times faster in air than in water [12].
The first stage represents the start of infiltration process when the wetting front was in the unsaturated zone. The results followed the theoretical line (Kostiakov's fitted line) up to 0.66 hour before the rate suddenly dropped by means the wetting front reached the capillary zone.
The presence of air in the soil matrix in the unsaturated zone greatly complicates the transport process.