Abstract
Video-monitoring can be exploited as a valuable tool to acquire continuous, high-quality information on the evolution of beach morphology at a low cost and, on such basis, perform beach resilience analyses. This manuscript presents preliminary results of an ongoing, long-term monitoring programme of five sandy Italian beaches along the Adriatic and Tyrrhenian sea. The project aims at analyzing nearshore morphologic variabilities on a time period of several years, to link them to resilience indicators. The observations indicate that most of the beach width variations can be linked to discrete variations of sandbar systems, and most of all to an offshore migration and decay of the outermost bars. Further, the largest net shoreline displacements across the observation period are experienced by beaches with a clear NOM (Net Offshore Migration)-type evolution of the seabed.
Highlights
A natural system is resilient when it is able to restore perturbations without losing its functionality.In the same way, the resilience of a beach could be defined as the capability to preserve its functionality under changing hydro-morphological conditions
We present preliminary results of nearshore morphological evolution derived from multi-year beach monitoring
The present analyses focused on the long-term behaviour rather than on the single event response, allowing, to identify all beach feature variations whose amplitude were larger than the above-mentioned thresholds
Summary
A natural system is resilient when it is able to restore perturbations without losing its functionality. The resilience of a beach could be defined as the capability to preserve its functionality under changing hydro-morphological conditions. Among the main and most relevant functions of wave-dominated beach systems is its capability to dissipate and absorb the energy of waves coming from the offshore. The morphologic impact of waves on coasts, focus of a growing volume of literature (e.g., [1,2,3]), has been proven a crucial matter for the subsistence of coastal communities. The thrive of coastal ecosystems and the related benefits for society are closely linked to beach integrity and well-functioning. Efficient management policies require evidence-based strategies to protect coasts without affecting the beach system capability to adapt to the hazards of climate change [4]
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