Tidal Case Study: Erosion Control – Scots Float

by Cain Bio-Engineering on June 21, 2012

Project: Erosion Control
Project Location: Scots Float
River System: Rother Inter-Tidal Channel
Date of Installation: 2005

Project Brief

The project aims were to reinstate the failing flood embankment on a wide outside meander. Erosion was threatening significant areas of farming land and infrastructure in the tidal flood plain.

Cain Bio-Engineering designed and installed a contoured brushwood mattress, anchored with hardwood stakes. Sediment deposited during each tidal cycle rapidly filled the mattress interstices with re-constituted clay colloid. The anaerobic conditions suspend decomposition of the internal woody skeleton, thus assuring the long-term integrity of the structure.

” By careful observation of the geomorphologic tidal features, Cain Bio-engineering consultants were able to design a sustainable solution entirely in keeping with natural processes and at a significant cost saving to the public purse”

Before

Before – 2004 Lateral erosion deconstructing major flood bund in the Rother inter-tidal channel Before – 2004: Erosion of the flood bund in the Rother inter-tidal channel

 

Before – 2004 Lateral erosion de-constructing major flood bund in the Rother inter-tidal channel Before – 2004: Erosion of the flood bund in the Rother inter-tidal channel

 

During

During – 2005: Hazel faggot installation on the Scots Float flood bund - Rother inter-tidal channel During – 2005: Hazel faggot installation on the Scots Float flood bund – Rother inter-tidal channel

 

During – 2005: Hazel faggot installation on the Scots Float flood bund - Rother inter-tidal channel During – 2005: Hazel faggot installation on the Scots Float flood bund – Rother inter-tidal channel

 

After (2005)

After – 2005: Up and downstream views of hazel faggot mattress on the Scots Float flood bund shortly after completion After – 2005: Up and downstream views of hazel faggot mattress on the Scots Float flood bund shortly after completion

 

After – 2005: Up and downstream views of hazel faggot mattress on the Scots Float flood bund shortly after completion After – 2005: Up and downstream views of hazel faggot mattress on the Scots Float flood bund shortly after completion

After (2012)

After – June 2012 Up and downstream views of hazel faggot mattress showing sediment accretions 7 years after project completion. After – June 2012: Up and downstream views of hazel faggot mattress showing sediment accretions 7 years after project completion.

 

After – June 2012 Up and downstream views of hazel faggot mattress showing sediment accretions 7 years after project completion. After – June 2012: Up and downstream views of hazel faggot mattress showing sediment accretions 7 years after project completion.

 

After – June 2012 Marginal vegetation encroachment on upper-tidal interface 7 years after project completion. After – June 2012 Marginal vegetation encroachment on upper-tidal interface 7 years after project completion.

 

After – June 2012 Marginal vegetation encroachment on upper-tidal interface 7 years after project completion. After – June 2012 Marginal vegetation encroachment on upper-tidal interface 7 years after project completion.

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