Picnic Island Coastal Inundation Hazard Assessment

Project Overview

The Picnic Island coastal hazard inundation study addresses the need to clearly understand how coastal processes influence the island under existing conditions and future climate change scenarios. Located within a highly exposed estuarine environment, Picnic Island is subject to tidal variability, storm surge, and rising sea levels. The assessment provides a robust technical basis to inform the safe and resilient use of the site while recognising its environmental sensitivity.

Key Features and Outcomes

Assessment of Coastal Inundation: The study examined coastal inundation mechanisms including astronomical tides, storm surge, and projected sea level rise. The assessment defined the extent, depth, and behaviour of inundation across the island under present day and future climate conditions.

Climate Change Considerations: Future scenarios were assessed to year 2100 to understand how increasing sea levels may alter inundation frequency and extent. This ensures long term risks are clearly identified and considered in future use and planning of the site.

Site Specific Understanding: The assessment recognised the low lying nature of Picnic Island and its hydraulic connection to the surrounding estuarine system. This allowed a realistic interpretation of how coastal waters interact with the island during elevated sea level events.

Risk Informed Decision Making: The findings provide clear technical guidance to support informed decisions regarding site use, infrastructure resilience, and appropriate adaptation measures.

Project Significance

The coastal hazard inundation study provides a comprehensive understanding of the constraints and opportunities associated with Picnic Island. By defining coastal inundation behaviour with a high level of confidence, the assessment supports safe site utilisation while respecting the island’s natural coastal processes.

Ongoing Application

Flussig Engineers remain committed to delivering high quality coastal engineering assessments that support resilient outcomes in challenging coastal environments. The Picnic Island study provides a strong technical foundation that can be relied upon to guide future decisions and long term adaptation planning for the site.