Introduction

Introduction

Deltas, estuaries and coastal lagoons are among the most productive and diverse ecosystems. In the same time, they are intensively exploited and impacted by human activities that strongly modify habitats and fluxes of water, sediments and nutrients. Increasing alteration of river basins together with threats of climate change, energy scarcity and biological invasions put these systems at risk. The complexity and vulnerability of this type of system in terms of natural functioning and human impacts makes urgent the definition and implementation of new ways to conduct research, observations, and management to mitigate the impacts of human activities and natural hazards in the coastal zone. Deltas are also excellent areas to study future impacts of global change because most are subsiding and thus are often already experiencing rapid rates of relative water level rise predicted for the near future eustatic sea-level rise.

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