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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Vegetation characteristics and floodplain topography from terrestrial laser scanning for hydraulic a...
Vegetation characteristics and floodplain topography from terrestrial laser scanning for hydraulic analyses
Author : JOHANNA JALONEN(1), JUHA JÄRVELÄ(2) & KAISA VÄSTILÄ(3)
ABSTRACT
This study investigates the applicability of terrestrial laser scanning (TLS) in determining floodplain topography and
vegetation characteristics for hydraulic analyses. Field investigations were conducted in a compound channel with five
differently vegetated sub-reaches from bare soil to grasses and willow saplings. Comparison of TLS to manual surveys
brought new insight in to the reliability of TLS to determine the ground level and vegetation characteristics of vegetated
floodplains. The mean absolute error (MAE) of the TLS-based ground level was 2-14 cm in the grassy sub-reaches with 50
cm window size. Even though scanning the reach after snowmelt decreased the MAE, for high resolution erosion and
deposition monitoring TLS needs to be supplemented with other surveying methods. A digital surface model of 1 cm in
resolution appeared suitable for estimating grass heights and its distribution. Different methods were needed for grassy
type of vegetation in comparison to woody vegetation; for grasses mean heights were applied, whereas for woody
vegetation a voxel-based method was derived.
File Size : 426,465 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 19/08/2015
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