In-situ loading experiments reveal how the subsurface affects coastal marsh survival

Claudia Zoccarato, Philip S.J. Minderhoud, Paolo Zorzan, Luigi Tosi, Alessandro Bergamasco, Veronica Girardi, Paolo Simonini, Chiara Cavallina, Marta Cosma, Cristina Da Lio, Sandra Donnici, Pietro Teatini*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)

Abstract

Over the past decades coastal marshes around the world have declined dramatically. Their deterioration is controlled by scarcity of sediments, erosion and accelerated rise of relative sea-level. The feedbacks between these processes control marsh evolution and determine their long-term survivability. Aggradation of a marsh to keep pace with relative sea-level rise mainly depends on the interplay between sedimentation and autocompaction, but their interactions are severely understudied. Here we present an in-situ loading experiment applied in the Venice Lagoon, Italy, to assess long-term autocompaction, with subsurface displacements and pressure monitored during loading cycles, up to ∼40 kN applied on a ∼4 m2 surface. Two identical experiments carried out in inorganic and organic soil-dominated marshes provided unique insights on the spatio-temporal subsurface dynamics. The large differences in behavior and maximum compaction (6 vs 32 mm) underscore the crucial role of autocompaction and soil heterogeneity when predicting the fate of coastal marshes worldwide.

Original languageEnglish
Article number264
JournalCommunications Earth and Environment
Volume3
DOIs
Publication statusPublished - 3 Nov 2022

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