IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Using a terrestrial laser scanner to characterize vegetation-induced flow resistance in a controlled
Using a terrestrial laser scanner to characterize vegetation-induced flow resistance in a controlled
Vegetation characteristics providing spatial heterogeneity at the channel reach scale can produce complex flow patterns
and the relationship between plant patterns morphology and flow resistance is still an open question (Nepf 2012). Unlike
experiments in laboratory, measuring the vegetation characteristics related to flow resistance on open channel in situ is
difficult. Thanks to its high resolution and light weight, scanner lasers allow now to collect in situ 3D vegetation
characteristics. In this study we used a 1064 nm usual Terrestrial Laser Scanner (TLS) located 5 meters at nadir above
a 8 meters long equipped channel in order to both i) characterize the vegetation structure heterogeneity within the
channel form a single scan (blockage factor, canopy height) and ii) to measure the 2D water level all over the channel
during steady flow within a few seconds scan. This latter measuring system was possible thanks to an additive
dispersive product sprinkled at the water surface. Vegetation characteristics and water surfaces during steady flows from
6 different plant spatial design on channel bottom for 4 plant species were thus measured. Vegetation blockage factors
at channel scale were estimated from TLS points clouds and analyzed.
File Size : 1,259,671 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 17/08/2015
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