Impact of road embankment construction on groundwater system in alluvial aquifers

다국어 초록 (Multilingual Abstract)

This study aims to evaluate the impact of road embankment construction on the groundwater system in alluvial aquifers that have excessively used groundwater. A road embankment was constructed across extensive flat alluvial deposits. Laboratory permeability tests demonstrated that the loading by road embankment significantly reduced the permeability of alluvial sediments, creating an impermeable boundary in the groundwater system. The numerical modeling results showed that road embankment acting as an impermeable boundary caused groundwater levels to rise in the upstream area but decline in the downstream area. However, unlike in other upstream areas, there was no noticeable rise in the groundwater level after the embankment construction in the area where the groundwater was in extensive use. The long-term water level monitoring also confirmed no meaningful change in water level during the road embankment construction. This is because the additional decline of the water level due to the decrease in the influence radius of groundwater pumping by the impermeable boundary offsets the increase in the upstream water level. The flow modeling and the water level monitoring showed that the overall impact of the road embankment construction on the groundwater supplies could be insignificant. However, the numerical modeling indicates that the degree of impact varies with the distance from the road embankment. This study implies that the impact of the road embankment construction on the groundwater supplies in the upstream area will depend on the geological and hydraulic settings, which determine the radius of influence, such as the hydraulic property of the alluvial aquifer, pumping rate, the number and location of pumps, etc.

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