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. Interaction studies of vegetation within flow environments are essential forthe determination of bank protection, morphological characteristics andecological conditions for wetlands. This paper uses the MIKE 21 hydrodynamicand salinity model to simulate the hydrodynamic characteristics and salinitytransport processes in the Pink Beach wetlands of the Liao River estuary. Theeffect of wetland plants on tidal flow in wetland areas is represented by avarying Manning coefficient in the bottom friction term. Acquisition of thevegetation distribution is based on Landsat TM satellites by remote sensingtechniques. Detailed comparisons between field observation and simulatedresults of water depth, salinity and tidal currents are presented in thevegetated domain of the Pink Beach wetlands. Satisfactory results wereobtained from simulations of both flow characteristics and salinityconcentration, with or without vegetation. A numerical experiment wasconducted based on variations in vegetation density, and compared with thetidal currents in non-vegetated areas; the computed current speed decreasedremarkably with an increase in vegetation density. The impact of vegetationon water depth and salinity was simulated, and the findings revealed thatwetland vegetation has an insignificant effect on the water depth andsalinity in this wetland domain. Several stations (from upstream todownstream) in the Pink Beach wetlands were selected to estimate thelongitudinal variation of salinity under different river runoff conditions;the results showed that salinityconcentration decreases with an increase in river runoff. This study canconsequently help increase the understanding of favourable salinityconditions for particular vegetation growth in the Pink Beach wetlands of theLiao River estuary. The results also provide crucial guidance for relatedinteraction studies of vegetation, flow and salinity in other wetlandsystems.

Numerical study of hydrodynamic and salinity transport processes in the Pink Beach wetlands of the Liao River estuary, China