Work Package 5 (WP5)

Estimation of the climate change effects on coastal and marine structures.

Research Teams: HYDRO_AUTh, MARINE_AEGEAN
Work Tasks:     3
Duration: 01/07/2014 – 30/09/2015 (15 months)
Person Months: 35.5
Deliverables:   3
Assessment of the probable influence of climate change on the design, functionality and safety of coastal and marine structures of the Greek coastal regions (WP4).
The vulnerability of such structures to the future climate and adaptations measures to reduce adverse effects will be considered.
WT 5.1. - HYDRO_AUTh: The functionality and stability of selected coastal structures will be determined using a perturbation method, a useful technique to identify the first order changes in a given function, which is applied to different semi-empirical formulas describing such features. Changes in functional and safety parameters (overtopping discharge, weight of rubble-mound) will be computed indicating likely climate change effects.
Long-term trends in mean values of significant wave height will firstly be assessed using a LogNormal distribution function with time-varying parameters. These trends, as well as mean sea level variability, will be combined with the perturbated semi-empirical formulas used for overtopping, to quantify climate change impacts on structural functionality.
Long-term trends of mean sea level and extreme marine events (wave heights and storm surges) for the time period 2000-2100, estimated within WPs 1 and 3, respectively, will also be used in conjunction with perturbated semi-empirical formulas for structural stability to estimate climate change effects on the safety of coastal structures.  
WT 5.2. - HYDRO_AUTh:
The response of coastal structures used for wave protection will be investigated under the influence of climate change. 
Upgrading of such structures will be investigated for meeting future conditions due to climate change like: (a) crest elevation increase and/or slope decrease (b) reduction of the incident wave height by constructing “front line” structures usually in the form of berm and low crested structures, resulting to partial scattering of the waves, or in the form of an overflow basin .
WT 5.3. - MARINE_AEGEAN:
The response of coastal structures used for the coastal protection from the erosive action of waves in a changing climate will be investigated. The influence of sea level rise and the wave height on the effectiveness of coastal structures against erosion will be studied.
Measures for upgrading such structures will be investigated as: increase of coastal structure crest elevation and/or length, combination with additional beach nourishment, construction of additional innovative structures (such as artificial reefs and vegetation) in front of the existing structures to reduce incident wave height.

Deliverables

5.1. Technical Report-HYDRO_AUTh.
DUE DATE: 31/12/2014
Assessment of climate change effects on functionality and stability of coastal structures. (WT 5.1)
5.2. Technical Report-HYDRO_AUTh, MARINE_AEGEAN.
DUE DATE: 30/09/2015
Performance and upgrading of coastal structures against flooding, accounting for climate change.  (WT 5.2)
5.3. Technical Report- HYDRO_AUTh, MARINE_AEGEAN.
DUE DATE: 30/09/2015
Development of methodologies and “good practices” for the design and upgrading of coastal structures against erosion. Computational tools for the study of the coastal structures response to the forcing of the waves and the sea level rise. (WT 5.3)