How to Cite

Murphy, E., Cornett, A., Nistor, I., & Baker, S. (2020). MODELLING TRANSPORT AND FATE OF WOODY DEBRIS IN COASTAL WATERS. Coastal Engineering Proceedings, (36v), papers.1.


Woody debris is ubiquitous in coastal waters, and on shorelines proximate to forested regions. Logs and driftwood play a vital role in coastal and global ecosystems, and can provide valuable data to support studies of oceanography, geomorphology, ecology, history and archaeology. There is growing interest in the role that woody debris can play in nature-based coastal engineering solutions. However, large quantities of woody debris in coastal waters can pose significant hazards to communities, infrastructure, navigation and ecosystems. Thus, the changing abundance and distribution of coastal driftwood, driven by factors including human activities and climate change, has potential for both positive and negative consequences. A better understanding of coastal driftwood fate and transport processes is needed to inform management practices, uses, and sustainable ecosystem management. To date, research on physical transport of woody debris, has been concentrated on tsunami and inland (riverine) environments, where spatiotemporal scales and driving processes are significantly different from typical climatic or even extreme (storm) conditions in coastal waters. In this paper, we describe a series of scale physical model experiments, conducted to provide insight to debris transport processes in coastal waters under a range of controlled wave and water level conditions. The experiments were conducted in a 50.4-metre by 29.4-metre wave basin, in which a 1/30 scale model of a natural shoreline comprised of a shallow fringing reef, a sandy shoreline, and several small coastal structures (groynes and breakwaters) was constructed. Wooden dowels and tree branches, scaled to replicate the size distribution of woody debris observed on Pacific Northwest shorelines, were released in the model. Despite some limitations (e.g., model scale effects), the experimental test results provided several valuable insights to factors affecting debris mobility in coastal areas. The results will inform the parameterization of important physical processes in a numerical model being developed to predict the fate and transport of woody debris in coastal waters.

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Alix, C. 2005. Deciphering the impact of change on the driftwood cycle: contribution to the study of human use of wood in the Arctic. Global and Planetary Change, 47 (2-4), 83-98.

Bartocci, P., M. Barbanera, M. D’Amico, P. Laranci, G. Cavalaglio, M. Gelosia, D. Ingles, G. Bidini, C. Buratti, F. Cotana, and F. Fantozzi. 2017. Thermal degradation of driftwood: Determination of the concentration of sodium, calcium, magnesium, chlorine and sulfur containing compounds. Waste Management, 60, 151-157.

Bocchiola, D., M.C. Rulli, and R. Rosso. 2008. A flume experiment on the formation of wood jams in rivers. Water Resources Research, 44(2), W02408.

Braudrick, C.A., and G.E. Grant. 2000. When do logs move in rivers? Water Resources Research, 36 (2), 571-583.

Convey, P., D. Barnes, and A. Morton. 2002. Debris accumulation on oceanic island shores of the Scotia Arc, Antarctica. Polar Biology, 25(8), 612-617.

D'Aoust, S.G., and R.G. Millar. 2000. Stability of ballasted woody debris habitat structures. Journal of Hydraulic Engineering, 126(11), 810-817.

Davidson, S.L., L.G. MacKenzie, and B.C. Eaton. 2015. Large wood transport and jam formation in a series of flume experiments. Water Resources Research, 51(12), 10065-10077.

Dean, R. 1985. Physical modelling of littoral processes. In Physical Modelling in Coastal Engineering, by R.A. Dalrymple, CRC Press, Boca Raton, 288pp.

Doong, D.J., H.C. Chuang, C.L. Shieh, and J.H. Hu. 2011. Quantity, distribution, and impacts of coastal driftwood triggered by a typhoon. Marine Pollution Bulletin, 62(7), 1446-1454.

Eamer, J.B., and I.J. Walker. 2010. Quantifying sand storage capacity of large woody debris on beaches using LiDAR. Geomorphology, 118(1-2), 33-47.

Edgell, M.C., and W.M. Ross. 1983. Marine log transportation and handling systems in British Columbia: impacts on coastal management. Coastal Management, 11(1-2), 41-69.

Gonor, J.J., J.R. Sedell, and P.A. Benner. 1988. What we know about large trees in estuaries, in the sea, and on coastal beaches. In From the forest to the sea, a story of fallen trees, by Maser, C., R.F. Tarrant, J.M. Trappe, and J.F. Franklin. U.S. Department of Agriculture.

Grilliot, M. 2019. The Role of Large Woody Debris on Sandy Beach-Dune Morphodynamics. PhD Thesis, University of Victoria, Victoria.

Häggblom, A. 1982. Driftwood in Svalbard as an indicator of sea ice conditions: a preliminary report. Geografiska Annaler: Series A, Physical Geography, 64(1-2), 81-94.

Harper, J.R., R.F. Henry, and G.G. Stewart. 1988. Maximum storm surge elevations in the Tuktoyaktuk region of the Canadian Beaufort Sea. Arctic, pp.48-52.

Heathfield, D.K., and I.J. Walker. 2011. Analysis of coastal dune dynamics, shoreline position, and large woody debris at Wickaninnish Bay, Pacific Rim National Park, British Columbia. Canadian Journal of Earth Sciences, 48(7), 1185-1198.

Kennedy, D.M., and J.L. Woods. 2012. The influence of coarse woody debris on gravel beach geomorphology. Geomorphology, 159, 106-115.

Kim, J., E. Murphy, I. Nistor, S. Ferguson, M. Provan. 2020. On the use of the ERA5 Reanalysis, Driftwood Line Survey Data, and Sea Ice Presence for Numerical Investigation of Storm Surges in the Beaufort Sea. Arctic Change 2020.

Kramer, N. 2016. Great river wood dynamics in Northern Canada. PhD thesis, Colorado State University.

Lepofsky, D., N. Lyons, and M.L. Moss. 2003. The use of driftwood on the North Pacific Coast: an example from Southeast Alaska. Journal of Ethnobiology, 23 (1), 125-142.

Miles, M.D. 1990. The GEDAP Data Analysis Software Package. National Research Council Canada Technical Report TR-HY-030, Ottawa.

Newman, J.N. 1965. The drift forces and moment on ships in waves. David Taylor Model Basin, US Naval Surface Warfare Center, Washington, 41pp.

Nistor, I., N. Goseberg, and J. Stolle. 2017. Tsunami-driven debris motion and loads: A critical review. Frontiers in Built Environment, 3, 1-11.

Ruiz-Villanueva, V., H. Piegay, M. Stoffel, V. Gaertner, and F. Perret. 2015. Analysis of wood density to improve understanding of wood buoyancy in rivers. In Engineering Geology for Society and Territory, 3, 163-166. Springer.

Steelandt, S., D. Marguerie, N. Bhiry, and A. Delwaide. 2015. A study of the composition, characteristics, and origin of modern driftwood on the western coast of Nunavik (Quebec, Canada). Journal of Geophysical Research: Biogeosciences, 120 (3).

Stolle, J., I. Nistor, and N. Goseberg. 2016. Optical tracking of floating shipping containers in a high-velocity flow. Coastal Engineering Journal, 58 (2), 1650005.

Sumer, B. M., and J. Fredsoe. 2002. The Mechanics of Scour in the Marine Environment, World Scientific, Singapore.

Thiel, M., and L. Gutow. 2005. The ecology of rafting in the marine environment. I. The floating substrata. Oceanography and Marine Biology: An Annual Review, 42, 181-264.

Wilson, J., I. Nistor, A. Mohammadian, A. Cornett, P. Falkenrich, and G. Lamont. 2020. Nature-based coastal protection using large woody debris (LWD). International Conference on Coastal Engineering, October 17.

Wohl, E., and J.R. Goode. 2008. Wood dynamics in headwater streams of the Colorado Rocky Mountains. Water Resources Research, 44(9), W09429.

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