Introduction
ABP Marine
Environmental Research working in conjunction with Coastal
Engineering UK Ltd. completed the Roa Island Shorelink
Sustainability Study in 2003 and was available to download from
this website. In 2010 the study was reviewed and updated by Mott
MacDonald consultants and the updated study is available to
download below. If you would like to view the original study please
contact Mark Ellis, Capita Symonds
mark.ellis@capita.co.uk
Tel. 01229 894515.
Study Aims and Objectives
The aim of the study was to provide an
appraisal of the shorelink (causeway) between Roa Island and the
mainland, including coast defences on the causeway and around Roa
Island. The study makes recommendations for future management of
the defences and Foulney Embankment.
Conclusions and Recommendations
The updated study has provided the following conclusions and
recommendations:
There has been no significant
degradation of defences since the original study in 2003.- Water levels and significant
wave heights have been updated to take account of new guidance from
Defra for allowances for climate change
- Economic analyses of various
options for defence maintenance/replacement have been examined and
a preferred option proposed. This option involves construction of
new revetments along the causeway and a realignment of Foulney
Embankment to create new saltmarsh habitat. These works are
proposed to commence in 2015.
- Prior to implementation of the
preferred option it will be necessary to eradicate a stand of
Japanese Knotweed, an aggressive alien species, which if left in
place would likely interfere with planned works.
- Additionally, prior to detailed
design work a ground investigation and wave modelling study will be
required.
Roa Island Shorelink Sustainability Study,
2010 Review
Download main RISS report (pdf 3MB).
Photographs of Roa Island
Causeway courtesy of Mr Alec Moore and Mr Ron Nuttall