Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1080/02626667.2011.590811
Title (Primary) Instrumental method for reducing error in compression-derived measurements of rainfall interception for individual trees
Author Van Stan, J.; Jarvis, M.; Levia, D.; Friesen, J.
Journal Hydrological Sciences Journal-Journal des Sciences Hydrologiques
Year 2011
Department CHS; CATHYD
Volume 56
Issue 6
Page From 1061
Page To 1066
Language englisch
Keywords forest hydrology; interception; stem compression; mechanical displacement sensor; LaserBark (TM)
Abstract

This technical note presents an instrumental method for the precise and timely installation of mechanical displacement sensors to investigate stem compression and relaxation associated with whole-tree rainwater loading and evaporation, respectively. We developed this procedure in response to the conclusions of Friesen et al. (2008), which called for the development of a precision mounting method for strain sensors on inherently-irregular trunk cross-sections so that rainfall interception, storage and evaporation may be distinguished from other strain-related phenomena. To supply precise sensor installation locations, high-resolution trunk profiles are generated using the LaserBark (TM) automated tree measurement system. These scans are utilized to approximate the location of neutral bending axes. A routine then instructs a mobile rangefinder along the cross-section to optically indicate exact positioning for strain sensors over the bending axes. As imprecise sensor placement linearly increases error and diminishes signal-to-noise ratio, this automated installation routine is designed to remove significant distortions created by wind throw, off-centre loading within unevenly-distributed canopies, and human error that can lead to erroneous measurements of rainfall interception.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=11082
Van Stan, J., Jarvis, M., Levia, D., Friesen, J. (2011):
Instrumental method for reducing error in compression-derived measurements of rainfall interception for individual trees
Hydrol. Sci. J.-J. Sci. Hydrol. 56 (6), 1061 - 1066