Effects of local scouring and saturation of soil due to flooding on maximum resistive bending moment for overturning Robinia pseudoacacia

Samarakoon, MB; Tanaka, Norio; Yagisawa, Junji

doi:10.1007/s11355-011-0169-9

Cited by 25 publications

(6 citation statements)

References 30 publications

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“…The decrease in soil strength due to increased pore-water pressures was also found in the study by Kamimura et al (2012). This study supported the results of Samarakoon et al (2013) and Rahardjo et al (2009) that showed a decrease of 10-50% in overturning moment required to overturn a tree when the soil was…”

Section: Contents (Svflux)supporting

confidence: 88%

Effect of rainfall on tree stability

Lee¹

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I would also like to express my appreciation to the Singapore National Parks Board (NParks) for the research funding and single-minded pursuit of the "City in a garden" vision for Singapore. NEWRI-DHI is also appreciated for the PhD scholarship. Thanks are also extended to Dr. Fong Yok King and Mr. Daniel Burcham of NParks for the close collaboration. Note of appreciation will also go to the Geotechnics Laboratory technicians, namely

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Section: Contents (Svflux)supporting

confidence: 88%

Effect of rainfall on tree stability

Lee¹

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“…The same finding was concluded by Danjon et al, (2008), which the roots effect on soil strength to failure is much higher close to the tree stem and this value can be negligible more than 1 meter distance far from the tree stem. This finding is in agreemnet by Samarakoon et al, (2011), which root tensile strength near the tree stem is very large due to large number of roots, as the distance from the tree stem is increased, total area of roots are decreased and hence, the root tensile strength reduce.…”

Section: Int J Biosci 2015mentioning

confidence: 53%

Tensile strength and root distribution of Acacia mangium and Macaranga tanarius at spatial variation(Case study: East-West highway, Malaysia)

2015

Int. J. Biosci.

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Directional distribution of roots and their tensile strength are the major factors which affects the soil shear resistance. Additional cohesion provided by roots can increase soil resistance to shallow landslide and mass movement. The aim of this study is to investigate individual root tensile strength (Tr)and whole root distribution of Acacia mangium and Macaranga tanarius in rainforest with regard to position around the tree stem.Excavation method was used for collecting roots around each tree at two distances of 25 cm and 1 meter from tree stem. The results showed that there was a significant difference between root tensile strength in two species at two distances and Tr was significantly higher for Acacia mangium (50.49± 2.31MPa at 25 cm for the root diameter range between 0.16-5.06 mm and 43.67 ± 2.44 MPa at 1 meter for the root range between 0.11-5.02 mm) than Macaranga tanarius (27.64 ± 1.72 MPa at 25 cm, root diameter range between 0.16-5.66 mm and 23.81 ± 0.97 MPa at 1 meter, the root diameter range between 0.21-6.34 mm). The results indicated that Tr was significantly higher at 25 cm than 1 meter at both species. Root area ratio (RAR) results showed that there was no significant difference in RAR at 25 cm and 1 meter of the stem in Acacia mangium, but that value showed a significant different in Macaranga tanarius at 25 cm and 1 meter. Root tensile strength and RAR are the key matters for understanding additional cohesion by plant roots. In order to assess soil reinforcement by vegetation roots, root tensile strength and RAR data in different vegetation and different sites are necessary.

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“…Further study of the equation for overturning is needed because substrate and root anchorage conditions are closely related to this breaking phenomenon 21) . b) Washout condition of trees Fig.…”

Section: Results and Discussion (1) Breaking Or Washout Condition Of mentioning

confidence: 99%

“…The pattern of uprooting was related to the strength of the substrate, and uprooting was most commonly observed at the front line of the vegetation 2) , but the region scoured by this tsunami was very large. Further studies on the conditions for breaking or uprooting of pine trees with real-scale breaking or uprooting tests like those of Tanaka et al 22) and Samarakoon et al 21) are recommended.…”

Section: Results and Discussion (1) Breaking Or Washout Condition Of mentioning

confidence: 99%

Effectiveness and Limitations of Coastal Forest in Large Tsunami: Conditions of Japanese Pine Trees on Coastal Sand Dunes in Tsunami Caused by Great East Japan Earthquake

Tanaka

2012

J. JSCE

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Coastal vegetation is widely recognized to reduce tsunami damage, but coastal forests in large areas of the Tohoku and Kanto districts of Japan were destroyed by the tsunami after the Great East Japan Earthquake on 11 March 2011. A field survey in the affected area elucidated the critical breaking conditions of Japanese coastal pine trees and identified the regions of large-tree debris production. Most broken trees remained in the vegetated region, but scoured regions behind the sea wall or on the down-slope regions of sand dunes produced large pieces of tree debris. In contrast, the pine trees in the inland zone were found to trap much debris. This trapping function should be utilized more in future designs. A numerical model that includes the breaking phenomena of trees estimates the capacity of a coastal forest to reduce the washout region of houses by around 150 m. This is not a negligible component of the mitigation measures when a large tsunami occurs and overflows the sea embankment.

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Effects of local scouring and saturation of soil due to flooding on maximum resistive bending moment for overturning Robinia pseudoacacia

Cited by 25 publications

References 30 publications

Effect of rainfall on tree stability

Effect of rainfall on tree stability

Tensile strength and root distribution of Acacia mangium and Macaranga tanarius at spatial variation(Case study: East-West highway, Malaysia)

Effectiveness and Limitations of Coastal Forest in Large Tsunami: Conditions of Japanese Pine Trees on Coastal Sand Dunes in Tsunami Caused by Great East Japan Earthquake

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