Coastal dunes persist through a balance of wind-blown sand supply, vegetation that traps and stabilizes sediment, and the absence of chronic disturbance. Heavy tourist foot traffic interrupts that balance by breaking plant stems, compacting sand, and creating bare pathways that concentrate wind erosion. Research by Rusty A. Feagin University of Texas at Austin documents that trampling reduces plant cover and accelerates surface erosion, making dunes more susceptible to reshaping and loss. The result is lower dune crest height, reduced sand storage, and diminished capacity to buffer storm surge.
Ecological mechanisms of damage
Vegetation such as grasses and shrubs perform the critical role of trapping sand and binding it with roots. When visitors repeatedly walk over dune vegetation, the loss of aerial parts lowers photosynthesis and root growth, which slows recovery. Richard H. Hesp University of Western Australia has described how plant morphology and root architecture influence dunes’ ability to rebuild. Resilience is therefore not uniform; dunes dominated by fast-growing, clumping grasses recover more readily than those with slow-growing shrubs or rare endemic species, and recovery times vary with climate, sand supply, and trampling intensity.
Human and management dimensions
Dune degradation has social and economic consequences because dunes act as natural sea defenses. Eric J. Nordstrom U.S. Geological Survey emphasizes that diminished dunes increase coastal communities’ exposure to storm waves and can raise repair costs for infrastructure. Cultural and territorial nuances matter: in some regions dunes are part of Indigenous heritage and local identity, so damage affects more than ecology. Managed access measures such as boardwalks, seasonal closures, fencing, and targeted revegetation have been shown to reduce impact and promote recovery. Studies led by Rusty A. Feagin University of Texas at Austin and coastal managers report that restricting trampling combined with planting native dune grasses increases vegetation cover and sediment accretion over years rather than months.
Resilience therefore depends on multiple factors: the intensity and duration of foot traffic, species present, ongoing sediment supply, and management interventions. Without active protection and restoration, heavy tourist pressure commonly transforms resilient dune systems into vulnerable coastal margins. Effective policy integrates ecological science, local cultural values, and enforcement to maintain dunes’ protective and habitat functions.