Standing tree decay detection by using acoustic tomography images

Reliability of acoustic tomography and ground-penetrating radar for tree decay detection

Applications in Plant Sciences ◽

10.1002/aps3.1187 ◽

2018 ◽

Vol 6 (10) ◽

pp. e01187 ◽

Cited By ~ 1

Author(s):

Xi Wu ◽

Guanghui Li ◽

Zhi Jiao ◽

Xiping Wang

Keyword(s):

Ground Penetrating Radar ◽

Acoustic Tomography ◽

Tree Decay ◽

Ground Penetrating

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Acoustic tomography based on hybrid wave propagation model for tree decay detection

Computers and Electronics in Agriculture ◽

10.1016/j.compag.2018.06.020 ◽

2018 ◽

Vol 151 ◽

pp. 276-285 ◽

Cited By ~ 3

Author(s):

Lei Liu ◽

Guanghui Li

Keyword(s):

Wave Propagation ◽

Propagation Model ◽

Acoustic Tomography ◽

Hybrid Wave ◽

Tree Decay ◽

Wave Propagation Model

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Genetic variation in decay resistance and its correlation to wood density and growth in white spruce

Canadian Journal of Forest Research ◽

10.1139/x03-150 ◽

2003 ◽

Vol 33 (11) ◽

pp. 2177-2183 ◽

Cited By ~ 20

Author(s):

Qibin Yu ◽

Dian-Qing Yang ◽

S Y Zhang ◽

Jean Beaulieu ◽

Isabelle Duchesne

Keyword(s):

Growth Rate ◽

Genetic Variation ◽

Wood Density ◽

Brown Rot ◽

White Spruce ◽

Decay Resistance ◽

White Rot ◽

Standing Tree ◽

Decay Fungus ◽

Tree Decay

This study investigated the genetic variation of white spruce (Picea glauca (Moench) Voss) in decay resistance and its correlation with wood density and growth. Three fungi were examined, a brown-rot fungus (Gloeophyllum trabeum), a white-rot fungus (Trametes versicolor), and a standing-tree-decay fungus (Fomitopsis pinicola). The decay resistance was inversely related to the growth rate of the fungi on heartwood blocks. A total of 270 trees of 35 families were harvested from 36-year-old provenanceprogeny trials at two sites through a thinning operation. The narrow-sense heritabilities of white spruce decay resistance to brown rot and white rot were 0.21 and 0.27, respectively. There were no significant differences in resistance to standing-tree-decay fungus among the families. The phenotypic and genetic correlations between the growth rate of brown rot on heartwood blocks and wood density were positive, but the genetic correlation between wood density and the growth rate of white rot on heartwood blocks was negative but not significant. The results indicate that the different species of fungi have different relationships with the annual growth of trees and wood density, and suggest that selection for wood density in white spruce might lead to an increase in resistance to white rot, but a decrease in resistance to brown rot.

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MAPPING TIDAL CURRENTS AND RESIDUAL CURRENTS BY USE OF COASTAL ACOUSTIC TOMOGRAPHY

Proceedings of International Conference "Managinag risks to coastal regions and communities in a changinag world" (EMECS'11 - SeaCoasts XXVI) ◽

10.31519/conferencearticle_5b1b94407213d3.12732916 ◽

2017 ◽

Author(s):

Xiao-Hua Zhu ◽

Ze-Nan Zhu ◽

Xinyu Guo ◽

...

Keyword(s):

Shallow Water ◽

Shallow Water Equations ◽

Mean Amplitude ◽

Momentum Equation ◽

Tidal Currents ◽

Acoustic Tomography ◽

Mean Values ◽

Residual Currents ◽

Water Depths ◽

Deep Area

A coastal acoustic tomography (CAT) experiment for mapping the tidal currents in the Zhitouyang Bay was successfully carried out with seven acoustic stations during July 12 to 13, 2009. The horizontal distributions of tidal current in the tomography domain are calculated by the inverse analysis in which the travel time differences for sound traveling reciprocally are used as data. Spatial mean amplitude ratios M2 : M4 : M6 are 1.00 : 0.15 : 0.11. The shallow-water equations are used to analyze the generation mechanisms of M4 and M6. In the deep area, velocity amplitudes of M4 measured by CAT agree well with those of M4 predicted by the advection terms in the shallow water equations, indicating that M4 in the deep area where water depths are larger than 60 m is predominantly generated by the advection terms. M6 measured by CAT and M6 predicted by the nonlinear quadratic bottom friction terms agree well in the area where water depths are less than 20 m, indicating that friction mechanisms are predominant for generating M6 in the shallow area. Dynamic analysis of the residual currents using the tidally averaged momentum equation shows that spatial mean values of the horizontal pressure gradient due to residual sea level and of the advection of residual currents together contribute about 75% of the spatial mean values of the advection by the tidal currents, indicating that residual currents in this bay are induced mainly by the nonlinear effects of tidal currents.

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