Analyse et gestion du risque d’envasement autour de la baie d’Antonina, Brésil. L’apport d’une démarche d’accompagnement

Abstract

The recent strengthening framework of law and regulation governing the activities of dredging in Brazil gives a new socio-environmental dimension to the crucial issue for both port activity and inhabitants of the siltation and the contamination of estuarine waters bodies, a topic that was rarely discussed openly until the early 2000s. Part one of the article redraws the emergence of the risk of accelerated siltation in Brazil, more particularly around the inner part of Paranaguá estuarine bay, in relationship with the recent transformations of the harbour system. The following part shows how the management of this risk was early directed to the control of the continental flows considered as a major source of danger for the security and the maintenance of port activities. A last part presents the difficulties to switch from a hazard-oriented to a territorial-oriented approach of risk management considering varying perceptions of risk among individuals and the unpredictable location of extreme rainy events that trigger landslides of various kinds resulting in silting up of the Antonina bay.

Keywords

• Silting
• Port planning
• Landslides
• Ecological restoration
• Companion modelling