Abstract
In British Columbia (BC), Canada, and Washington State, USA, anchored Large Woody Debris (LWD) have been extensively used with the specific aim of reducing erosion and limiting wave run-up. Despite its frequent usage, there is currently limited peer-reviewed literature on the design or efficacy of coastal protection using LWD. This paper presents the results of the first systematic research project on this topic, which involved (1) extensive field investigations of existing anchored LWD projects, and (2) large-scale experimental wave modeling of simulated LWD on a gravel beach. The full paper will present an overview of the study methodology, field investigation and experimental modeling results, and provide initial design guidance for the use of coastal protection using anchored LWD.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/ktjVWGfXylk
Highlights
Natural accumulations of Large Woody Debris (LWD) are thought to be an important component of a diverse coastal habitat (Rich et al, 2014) and provide shore-stabilization benefits (Heathfield and Walker, 2011; Kennedy and Woods, 2012)
OBJECTIVES / NOVELTY This paper presents the results of the first systematic research project focused on understanding the design and efficacy of anchored LWD in a coastal environment
Additional observations were made on site and LWD design characteristics, including log diameter, log length, installation type, and anchoring technique
Summary
Natural accumulations of Large Woody Debris (LWD) are thought to be an important component of a diverse coastal habitat (Rich et al, 2014) and provide shore-stabilization benefits (Heathfield and Walker, 2011; Kennedy and Woods, 2012). A two-pronged approach was taken to answer these questions, which included: (1) extensive field investigations of existing anchored LWD projects, and (2) large-scale experimental wave modeling of simulated LWD on a gravel beach. Measurements of the LWD placement elevation and beach slope were made using an RTK GPS within BC, and a rotary laser level and rod within Washington State where site-access permitted.
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