Tidal wetlands are connected with coastal estuarine systems and typically have a low-lying intertidal area with a more elevated supratidal zone (Sheaves & Johnston, 2008;Snedden et al., 2012). The low-lying intertidal wetland surface is regularly inundated by saline seawater from tidal creeks and drainage channels within the wetland (Wolanski & Elliott, 2016). This induces complex porewater-seawater mixing in the wetland aquifer. The abundance of salts in the wetland soil creates a brackish-saline environment, which selectively accommodates halophytic (salt-tolerant) species in the intertidal zone (Barbier et al., 2011).A large number of studies have previously been carried out to understand coastal hydrogeological processes in beach settings, including saltwater intrusion, submarine groundwater discharge (SGD), and upper saline plumes (e.g., Evans & Wilson, 2016;Li et al., 1999;Robinson et al., 2007). Similarly, the hydrology and ecology in tidal wetlands are strongly affected by the tide-influenced porewater flow and salt transport in the wetland subsurface (Hughes, 2016;Moffett et al., 2012;Ursino et al., 2004). However, subsurface hydrology in tidal wetlands, particularly the salt transport patterns, is understudied compared to beach environments (Guimond & Tamborski, 2021;Xin et al., 2022). The sand-dominated beach is characterized by receiving fresh groundwater from inland and discharging it through a submarine zone above the seawater wedge (Figure 1b) (e.g.

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