Hydraulic conductivity determines the velocity of water migration in the vadose
zone. It is affected by the quantity and connectivity of pores generated by intergranular pores and fissures and interlaminar fractures of vadose zone media. The
greater hydraulic conductivity, the worse mitigation performance of vadose zone.
According to the type of vadose zone media, hydraulic conductivity can be divided
into the permeability of cohesive soil layer (K1) and the permeability of
non-cohesive soil layer (K2). Both K1 and K2 are used as the main factors of
mitigation performance of vadose zone.
In view of the different adsorption and degradability of vadose zone media for
different pollutants, with reference to the consideration to chemical reactions of
pollutants in the HYDRUS-1D model, the adsorption (Kd) and degradability (l) of
rocks and soils are taken the main factors of mitigation performance of vadose zone.
In short, the main factors of mitigation performance of vadose zone include
maximum pollution thickness (M), thickness of cohesive soil layer (M1), thickness
of non-cohesive soil layer (M2), permeability of cohesive soil layer (K1), permeability of non-cohesive soil layer (K2), adsorption of rocks and soils (Kd) and
degradability of rocks and soils (l).
3.1.5 Indicator Library for Groundwater Pollution Source
Intensity Rating and Evaluation
Based on the above analysis, the characteristic factors of groundwater pollution
sources can be summarized as the forms of pollution sources, types of pollution
sources, characteristic pollutant properties, location of discharge, pollution source
intensity, pollution pathway, affected area, seepage control measures, and time of
discharge. Depending on whether the groundwater has been contaminated,
groundwater pollution sources are divided into potential sources and existing
sources in the indicator system for groundwater pollution source intensity evaluation. The characteristic factors of the vadose zone include depth to water table,
topography, impact of vadose zone media, thickness of rock-soil layer, permeability
of rocks and soils, adsorption of rocks and soils, and degradability of rocks and
soils.
On this basis, an indicator library is constructed for the evaluation of groundwater pollution source intensity, as shown in Table 3.1.
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3 Rating and Evaluation of Pollution Source Intensity …
zone. It is affected by the quantity and connectivity of pores generated by intergranular pores and fissures and interlaminar fractures of vadose zone media. The
greater hydraulic conductivity, the worse mitigation performance of vadose zone.
According to the type of vadose zone media, hydraulic conductivity can be divided
into the permeability of cohesive soil layer (K1) and the permeability of
non-cohesive soil layer (K2). Both K1 and K2 are used as the main factors of
mitigation performance of vadose zone.
In view of the different adsorption and degradability of vadose zone media for
different pollutants, with reference to the consideration to chemical reactions of
pollutants in the HYDRUS-1D model, the adsorption (Kd) and degradability (l) of
rocks and soils are taken the main factors of mitigation performance of vadose zone.
In short, the main factors of mitigation performance of vadose zone include
maximum pollution thickness (M), thickness of cohesive soil layer (M1), thickness
of non-cohesive soil layer (M2), permeability of cohesive soil layer (K1), permeability of non-cohesive soil layer (K2), adsorption of rocks and soils (Kd) and
degradability of rocks and soils (l).
3.1.5 Indicator Library for Groundwater Pollution Source
Intensity Rating and Evaluation
Based on the above analysis, the characteristic factors of groundwater pollution
sources can be summarized as the forms of pollution sources, types of pollution
sources, characteristic pollutant properties, location of discharge, pollution source
intensity, pollution pathway, affected area, seepage control measures, and time of
discharge. Depending on whether the groundwater has been contaminated,
groundwater pollution sources are divided into potential sources and existing
sources in the indicator system for groundwater pollution source intensity evaluation. The characteristic factors of the vadose zone include depth to water table,
topography, impact of vadose zone media, thickness of rock-soil layer, permeability
of rocks and soils, adsorption of rocks and soils, and degradability of rocks and
soils.
On this basis, an indicator library is constructed for the evaluation of groundwater pollution source intensity, as shown in Table 3.1.
40
3 Rating and Evaluation of Pollution Source Intensity …