Scour Countermeasures

Scour and Countermeasures

Brunswick, New Jersey

September 13, 2017

Scour and Countermeasures • SCOUR/STREAM PROBLEMS • SCOUR PROTECTION COUNTERMEASURES • SCOUR MONITORING • THRESHOLD FOR REPAIR MEASURES

Brunswick, New Jersey

September 13, 2017

Scour and Countermeasures • PRIMARY SCOUR/STREAM PROBLEMS Degradation Aggradation Pier Scour Autment Scour Channel Migration Debris related scour Tidal Scour Bridge Alignment to the channel Headcut Inadequate bridge opening Other Brunswick, New Jersey

September 13, 2017

Scour and Countermeasures • SCOUR PROTECTION COUNTERMEASURES Rock Riprap Partially grouted riprap Interlocking or cable-tied articulating blocks Gabion/gabion mattress Impermeable Spurs (jetties, groins, wing dams) Permeable spurs (fences, netting) Bendway Weirs/Stream Barbs Sheetpiling Vegetative Stabilization Control of Downstream Water level Grout bags Other Brunswick, New Jersey

September 13, 2017

Scour and Countermeasures •

SCOUR MONITORING Routine/Special/Underwater Inspection Underwater Acoustic Imaging Soundings/Bathymetric Survey Fixed Sonar Sensor Portable Sonar Sensor Tilt Sensor Water Stage Sensor Magnetic Sliding Collar Float-Out Devices Scour Balls Other Brunswick, New Jersey

September 13, 2017

Scour and Countermeasures • THRESHOLD FOR REPAIR MEASURES Spread Footings - Abutments Pile/Deep Foundations Abutments Spread Footings - Piers Pile/Deep Foundations - Piers

Brunswick, New Jersey

September 13, 2017

Scour and Countermeasures

Brunswick, New Jersey

September 13, 2017