| Citation: | YU Jing，PEI Hongjun，WANG Bingguo. Influence of saturated hydraulic conductivity uncertainty on ammonium-nitrogen transport in the double-layer vadose zone of the Jianghan Plain[J]. Bulletin of Geological Science and Technology，2025，44（6）：1-10 doi: 10.19509/j.cnki.dzkq.tb20230722
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To investigate the influence of uncertainty in soil saturated hydraulic conductivity on solute transport,
Stochastic numerical simulations were conducted to examine the effects of saturated hydraulic conductivity uncertainty on ammonium-nitrogen (NH4+-N) transport within a representative double-layer vadose zone of the Jianghan Plain.
The results show that, when considering the uncertainty of the saturated hydraulic conductivity of the upper soil, the migration depth of the NH4+-N front, the peak concentration, and the depth of the concentration peak-along with their variation ranges, are all greater in the "coarse on top and fine on bottom" lithologic configuration than in the "fine on top and coarse on bottom" configuration. When considering the uncertainty of the saturated hydraulic conductivity of the lower soil, these three indicators are less sensitive to conductivity uncertainty in the "coarse-upper and fine-lower" structure, whereas the impacts are relatively more significant in the "fine-upper and coarse-lower" structure. Comparison of the simulation results indicates that the uncertainty of saturated hydraulic conductivity in sandy loam exerts a stronger influence on the magnitude and depth of NH4+-N concentration peaks than that in silty loam. This suggests that, within double-layer vadose zones, the uncertainty of saturated hydraulic conductivity in coarse-textured soils plays a more significant role in controlling solute transport.
The findings provide a methodological reference for vadose-zone solute transport research in the Jianghan Plain and a scientific basis for the prevention and control of groundwater NH4+-N pollution in the region.
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