naa a22 4500 510762646 CHVBK 20180411083145.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1007/s11355-011-0169-9 doi (NATIONALLICENCE)springer-10.1007/s11355-011-0169-9 Effects of local scouring and saturation of soil due to flooding on maximum resistive bending moment for overturning Robinia pseudoacacia [Elektronische Daten] [M. Samarakoon, Norio Tanaka, Junji Yagisawa] The effects on Robinia pseudoacacia (an exotic and invasive plant in Japanese rivers) of local scouring and saturation of the soil in the root-anchoring zone due to flooding were investigated. Scouring has been defined as the removal of substrate in the root-anchoring zone, exposing the tree roots. Tree-pulling experiments were conducted, simulating flood action, and the resulting damage was examined in order to assess the effect of local scouring on the maximum resistive bending moment (M max) for overturning. Scouring was artificially created to three different depths, 0, 25, and 50cm. A nonlinear model was developed that included soil strength characteristics to calculate the critical overturning moment (M cri) under dry and saturated soil conditions. Significant correlations (p<0.05) of M max with different tree and root-soil plate characteristics, such as diameter at breast height (D bh), tree weight, root depth, and root-soil plate radius, were developed in order to elucidate the effects of scouring on M max. M max was slightly reduced with scouring depth for trees with D bh <10cm (small) trunks, and it was significantly and negatively (p<0.05) correlated with scouring depth for trees with 10<D bh<20cm (medium) trunks. However, M max did not change significantly with scouring depth for trees with a D bh >20cm (big) trunks. The nonlinear model was useful for determining the M cri of R. pseudoacacia under dry and saturated soil conditions. The overturning moments of all (small, medium, and big) trees were considerably reduced under the saturated soil condition. It could be concluded that medium-sized trees were greatly affected by scouring, and that small and big trees were mainly affected by saturation of the soil under severe flooding conditions. International Consortium of Landscape and Ecological Engineering and Springer, 2011 Floodplain forests nationallicence Flood effects nationallicence Substrate removal nationallicence Moisture content of soil nationallicence Tree-pulling experiments nationallicence Samarakoon M. Institute for Environmental Science and Technology, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, 338-8570, Saitama, Japan aut Tanaka Norio Institute for Environmental Science and Technology, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, 338-8570, Saitama, Japan aut Yagisawa Junji Institute for Environmental Science and Technology, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, 338-8570, Saitama, Japan aut Landscape and Ecological Engineering Springer Japan 9/1(2013-01-01), 11-25 1860-1871 9:1<11 2013 9 11355 https://doi.org/10.1007/s11355-011-0169-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11355-011-0169-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Samarakoon M. Institute for Environmental Science and Technology, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, 338-8570, Saitama, Japan aut NATIONALLICENCE 700 1- Tanaka Norio Institute for Environmental Science and Technology, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, 338-8570, Saitama, Japan aut NATIONALLICENCE 700 1- Yagisawa Junji Institute for Environmental Science and Technology, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, 338-8570, Saitama, Japan aut NATIONALLICENCE 773 0- Landscape and Ecological Engineering Springer Japan 9/1(2013-01-01), 11-25 1860-1871 9:1<11 2013 9 11355 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer