Trapping Large Wood Debris in Rivers: Experimental Study of Novel Debris Retention System

2021 ◽  
Vol 147 (3) ◽  
pp. 04020101
Author(s):  
Diego Panici ◽  
Prakash Kripakaran
Keyword(s):  
Experimental Study ◽  
Large Wood ◽  
Retention System ◽  
Wood Debris

scholarly journals NATURE-BASED DYNAMIC REVETMENT CONSTRUCTION AT NORTH COVE, WASHINGTON, USA

2020 ◽  
pp. 38
Author(s):  
David Cottrell ◽  
Gavin Glore
Keyword(s):  
Pacific Northwest ◽  
Native Vegetation ◽  
Large Wood ◽  
Willapa Bay ◽  
Innovative Design ◽  
Coastal Barrier ◽  
Wood Debris ◽  
Dune Ridge ◽  
The U.S ◽  
Over Time

A dynamic revetment was constructed at North Cove, Washington, USA in December 2018 along a historically eroding 2-km shoreline reach of coastal barrier at the northern entrance to Willapa Bay. The revetment is composed of poorly sorted angular quarry rock ranging in size from pea gravel to small boulders as well as large wood debris and structures, a dune ridge, and native vegetation integrated with the revetment. The design, aim, and maintenance of the dynamic revetment is to simulate the functions of naturally forming cobble berms along composite beaches in the U.S. Pacific Northwest. The dynamic revetment continues to be adaptively constructed over time, enabling the testing of innovative design approaches and concepts that are rarely possible to do at full-scale in the field. The project provides a unique opportunity to explore nature-based engineering principles and design features.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/5w18tEjEePg

Experimental study on large wood filtration performance by herringbone water-sediment separation structure

2017 ◽  
Vol 14 (2) ◽  
pp. 269-281 ◽  
Author(s):  
Xiang-ping Xie ◽  
Fang-qiang Wei ◽  
Hong-juan Yang ◽  
Tao Xie
Keyword(s):  
Experimental Study ◽  
Large Wood ◽  
Filtration Performance

scholarly journals Experimental study of the transient motion of floats reproducing floating wood in rivers

2018 ◽  
Vol 40 ◽  
pp. 02041
Author(s):  
Hossein Ghaffarian Roohparvar ◽  
Diego Lopez ◽  
Nicolas Riviere ◽  
Herve Piegay ◽  
Emmanuel Mignot
Keyword(s):  
Experimental Study ◽  
Body Length ◽  
Urban Areas ◽  
Hydraulic Structures ◽  
Large Wood ◽  
Transient Motion ◽  
Particle Characteristic ◽  
Floating Particles ◽  
Response Distance ◽  
Key Parameter

The flow of large wood among hydraulic structures in rivers, especially in urban areas, can cause many problems. Despite many statistical, morphological and hydrodynamical studies on this phenomenon, little information is available on the transient motion of floating wood pieces. In this study, we investigate theoretically and experimentally the transient motion of floating particles under a simple acceleration. From a standard advection model we identify a particle characteristic response distance to the flow, noted λ. This key parameter is then measured for different floating particles reproducing wood in rivers (logs without and with idealized roots). We show here the typical value of this parameter as a function of particle streamwise body length for different particle geometries. The influence of roots can be well captured by an equivalent frontal area, regardless of the root pattern. This response distance could provide useful information on the probability of impact on hydraulic structures depending on the floating wood characteristics.

scholarly journals A practical method to assess risks from large wood debris accumulations at bridge piers

2020 ◽  
Vol 728 ◽  
pp. 138575
Author(s):  
Diego Panici ◽  
Prakash Kripakaran ◽  
Slobodan Djordjević ◽  
Kevin Dentith
Keyword(s):  
Practical Method ◽  
Bridge Piers ◽  
Large Wood ◽  
Wood Debris

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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