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Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Hampton Forest Slash Barrier 2021

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Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Hampton Forest Slash Barrier 2021

Looking Upstream - Installing the support ropes

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Hampton Forest Slash Barrier 2021

Looking downstream at the completed structure which is hardly visible

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Hampton Forest Slash Barrier 2021

Mid construction

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Hampton Forest Slash Barrier 2021

The contractor Rock Control installing the ring mesh

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Hampton Forest Slash Barrier 2021

Looking downstream at the completed structure

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Hampton Forest Slash Barrier 2021

The slash barrier was first filled in March 2022 and successfully contained a combitantion of slash and landslide material. The system was then cleaned out and filled again in January 2023

Ochrona przed spływami gruzowymi (rumowisko) i płytkimi  osuwiskami - Hampton Forest Slash Barrier 2021

The system was cleaned out and filled again in January 2023. The barrier was cleared again in February 2023 and 2 - 3 days later was filled again. The barrier was over topped and remains intact.

 

Rok Instalacji / Montazu

2021

Sytuacja początkowa

The best management of slash material is at the source. However, even with the best practices, unforeseen extreme weather events can mobilise tree waste and debris into river channels which can cause significant damage to downstream assets. Historically in New Zealand forestry slash-catching barriers are built in-house with various combinations of rope, railway irons and recycled steel members which are then secured back to the bank with deadman anchors.  These structures are effective at stopping small volumes of slash material but risk catastrophic failure from overload subsequently releasing a large volume of material downstream at once. Rayonier Matariki Forests wanted to be proactive and set a new protection benchmark by installing a Geobrugg 1:1 tested and engineered solution, common in Europe but a first in NZ. Although designed for an extreme weather event, the intention is that the barrier is never significantly impacted through slash management at the source and then it can then be dismantled and used at another similar location.

Opis zastosowanego rozwiazania

A VX140-H4 was installed in the river channel near the boundary of the 800ha catchment. The barrier height and location were chosen to utilise the large upstream catchment area for log and debris accumulation. The location also has good access for future maintenance/clearing if required. The VX140-H4 System (140kN/m²) was selected to provide sufficient capacity for both the static and dynamic loads of debris and driftwood (slashing) events. Wire rope anchors were used to transfer the loads back into the ground and provide design redundancy should some bank erosion occur. Edge protection was also installed on the top rope to protect the structure in the event of overtopping.

Kraj / Region

Nowa Zelandia

Wykonawca

Rock Control

Chroniony Objekt

Other

Osoba kontaktowa na miejscu

Kevin Coyle
 

Kevin Coyle

Regional Manager Northeast

Zagrożeniami naturalnymi
Nżynieria hydrauliczna
Geobrugg North America, LLC,3 Beaudet Terr,CT 06237 Columbia / USA Regional Manager Northeast

Formularz kontaktowy

Saleh Feidi
 

Saleh Feidi

Zagrożeniami naturalnymi
Nżynieria hydrauliczna
Geobrugg North America, LLC,8921 Emperor Ave.,91775 San Gabriel, California / USA

Formularz kontaktowy

John Kalejta
 

John Kalejta

Zagrożeniami naturalnymi
Nżynieria hydrauliczna
Geobrugg North America, LLC,KS 67226 Wichita / USA

Formularz kontaktowy

Bob Lyne
 

Bob Lyne

Zagrożeniami naturalnymi
Nżynieria hydrauliczna
Geobrugg North America, LLC,8004 Windspray Drive,NC 27358 Summerfield / USA

Formularz kontaktowy

Pierce Runnels, Civil Engineer
   

Pierce Runnels

General Manager Geobrugg North America

Zagrożeniami naturalnymi
Geobrugg North America, LLC,22 Centro Algodones , Civil Engineer General Manager Geobrugg North America

Formularz kontaktowy

Tim Shevlin
 

Tim Shevlin

Zagrożeniami naturalnymi
Geobrugg North America, LLC,OR 97302 Salem / USA

Formularz kontaktowy