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Study on Root Strength Characteristics for Dominant Trees in Landslides Area of Shi-Men Reservoir Watershed
|摘要:||民國88 年台灣中部地區921 大地震，使石門水庫上游集水區地
質岩層受到嚴重之擾動及土石崩落；加上93 年8 月艾利颱風及94 年
The enormous Chi-Chi earthquake occurred in central Taiwan in 1999. The earthquake destruct geological formations in the upstream of the Shi-Men reservoir watershed. The heavy rain brought from typhoon Aili in August in 2004 and typhoon Masa in August in 2005 caused many landslides. The authorities have managed the landslides to recovery. The measure way including the construction for slope stabilization, vegetation engineering, slope drain, etc. Slope vegetation is conducive to the collapse of shallow landslide because the roots have functions in network soling and anchoring earth. We investigate the plants invaded and succession. We choose five of the most important dominant trees at landslide scars characteristics for its root strength to evaluate the model of slope stability. The regression analysis from the five plants shows the index correlation between peak pull-out force and basic diameter. We Integrated of all the regressions. The pulling resistance of Roxburgh sumac and Subcostate crape myrtle are stranger than others under fixed root diameter condition. We investigate the roots distribution to recover that Roxburgh sumac and Subcostate crape myrtle have a lot of root. The root is very deep and wide. So we can sure that Roxburgh sumac and Subcostate crape myrtle have larger effect on slope stability. In addition, we derived formula of root sheer stress. It shows that Taiwan hibiscus also have ability to stabilize earth because they have vertical roots deeply stretching into layer. In this study, as a result of the same basic diameter comparison, plant roots have some difference due to the actual age of the trees - drive-level curve, the growth of different soil characteristics and root extension. Sample size needs to be increased in experimental analysis, the actual collapse of the restoration and conservation of function with the slope remains to be further explored.
|Appears in Collections:||水土保持學系|
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