When do logs move in rivers?

  title={When do logs move in rivers?},
  author={Christian A. Braudrick and Gordon E Grant},
  journal={Water Resources Research},
  pages={571 - 583}
Large woody debris is an integral component of forested, fluvial systems throughout the world, yet we know little about hydraulic thresholds for movement and transport of logs. We developed theoretical models of entrainment and performed flume experiments to examine thresholds for wood movement in streams. Both the model and the experiments indicate that log entrainment is primarily a function of the piece angle relative to flow direction, whether or not the log had a rootwad, the density of… 

Transport and deposition of large woody debris in streams: a flume experiment

Flume experiments on entrainment of large wood in low-land rivers

ABSTRACT Floating wood is increasingly recognized as a source of hazard during flood events, because of its potential to clog bridges and hydraulic structures. However, wood entrainment by water is

Wood dispersal in braided streams: Results from physical modeling

Wood is a key feature of riverine systems, playing a significant role in their morphodynamics and ecology. Wood dynamics have been widely investigated in single‐thread streams, but limited

Experimental study on entrainment of large wood in lowland rivers

Wood transport in rivers, typically occurring during flood events, represents a relevant hazard for its potential to create obstruction at bridges and narrow cross-sections. Therefore, the

Field measurements of drag coefficients for model large woody debris

Modeling wood dynamics, jam formation, and sediment storage in a gravel‐bed stream

[1] In small and intermediate sized streams, the interaction between wood and bed material transport often determines the nature of the physical habitat, which in turn influences the health of the

hich stream wood becomes functional following wildfires ?

Large wood is a critical element in stream ecosystems, but only a subset of wood pieces actually provide hydraulic, geomorphic, and ecological functions. We test the current paradigm that larger

Modeling entrainment of waterlogged large wood in stream channels

Research has led to an understanding of how floatable wood provides physical complexity and habitat in streams, but little is known about large wood that does not float because it is waterlogged,

Large wood transport and jam formation in a series of flume experiments

Large wood has historically been removed from streams, resulting in the depletion of in‐stream wood in waterways worldwide. As wood increases morphological and hydraulic complexity, the addition of




The influence of woody debris on channel morphology and aquatic habitat has been recognized for many years. Unlike sediment, however, little is known about how wood moves through river systems. We

Hydraulic guidelines for the re-introduction and management of large woody debris in lowland rivers

The volume of large woody debris in most of the world's lowland rivers has been depleted, either through persistent de-snagging or clearance of the riparian vegetation from which it is naturally

Dynamics of large woody debris in streams in old-growth Douglas-fir forests

Transfer of large woody debris (>10 cm diameter) from old-growth Douglas-fir (Pseudotsugamenziesii (Mirbel) Franco) forests into five first-to fifth-order stream reaches (drainage areas of 0.1 to

Changes in Characteristics and Function of Woody Debris with Increasing Size of Streams in Western Washington

Abstract In second- to fifth-order streams that drain old-growth timber in western Washington, characteristics and function of woody debris changed in relation to stream size. Average diameter,

Distribution of coarse woody debris in a mountain stream, western Cascade Range, Oregon'

The amount of coarse woody debris and the number of pool-forming pieces are relatively high in wide, sinuous reaches, where a complex structure of floodplains and riparian forests develops in association with a braided channel pattern.


Field surveys document the accumulation of large woody debris (LWD) into structurally distinctive jam types in the alluvial channel of the Queets River on the Olympic Peninsula of north west

Distribution of bedrock and alluvial channels in forested mountain drainage basins

MOUNTAIN river networks often consist of both bedrock and alluvial channels1–5, the spatial distribution of which controls several fundamental geomorphological and ecological processes6,7. The nature

Effects of coarse woody debris and its removal on a channel affected by the 1980 eruption of Mount St. Helens, Washington

During the May 18, 1980, eruption of Mount St. Helens, Washington, a pyroclastic surge introduced large volumes of coarse woody debris (CWD) and fine-grained sediment to Clearwater Creek,

Movement and characteristics of stream-borne coarse woody debris in adjacent burned and undisturbed watersheds in Wyoming

Following fire, changes in streamflow and bank stability in burned watersheds can mobilize coarse woody debris. In 1990 and 1991, I measured characteristics of coarse woody debris and standing