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) FULL PAPERS : THEME 2- 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 , JUHA JÄRVELÄ & KAISA VÄSTILÄ
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 : 728,015 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) FULL PAPERS
Article : THEME 2- HYDRO-ENVIRONMENT
Date Published : 18/04/2016
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