The vadose zone above an unconfined aquifer affects how the groundwater level changes. A study looked at how the vadose zone influences tide-induced fluctuations in the groundwater table. They found that the vadose zone can make the fluctuations stronger but also reduce the overall water exchange between surface water and groundwater. The thickness of the vadose zone and the capillary rise play a role in these effects. Thicker vadose zones weaken the impact, while higher capillary rise strengthens it. This research helps us understand how the vadose zone affects how unconfined aquifers respond to tides.