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首页> 外文期刊>Geomorphology >Effects of vegetation on debris flow mitigation: A case study from Gansu province, China
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Effects of vegetation on debris flow mitigation: A case study from Gansu province, China

机译：植被对减缓泥石流的影响：以甘肃省为例

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Debris flows are traditionally controlled using civil engineering structures such as check dams. However, the misuse of such strategies may sometimes trigger environmental hazards such as the catastrophic landslide in 2010 in Zouqu county, China, and therefore other methods such as the use of vegetation as an eco-engineering tool are increasingly being adopted. The aim of the present research was to investigate the bioengineering effects of vegetation over time in an area prone to debris flows in Gansu province, China. We collected detailed data from 2012 to 2014 on vegetation type, density, and root system morphology, and measured profiles across the valley. In addition, we assessed the increased soil cohesion provided by the root development of three monospecific stands of Robinia pseudoacacia of different ages growing within the debris valley, and on a larger scale, their effects on channel morphology. These data were incorporated into a modified form of BSTEM (Bank Stability and Toe Erosion Model) and a cellular braided-stream model. The results indicate that with increasing age, the FOS (factor of safety) of the bank would be significantly increased, and that the flooded area in the valley caused by simulated flood events would be decreased by 18-24%, on average. Subsequently, field data were incorporated into a cellular model to simulate sediment movement and the effects of vegetation on the channel dynamics. The results demonstrate that the stability provided by vegetation could result in a less active valley system and that overall the development of debris-controlling vegetation could make a major contribution to ecosystem restoration. However, careful management is essential for making optimum use of the vegetation. (C) 2017 Elsevier B.V. All rights reserved.
机译：传统上，泥石流是使用土木工程结构（如止水坝）控制的。但是，滥用这些策略有时可能会引发环境危害，例如2010年中国邹曲县的特大滑坡，因此，越来越多地采用其他方法，例如将植被用作生态工程工具。本研究的目的是调查中国甘肃省易发生泥石流的地区植被随​​时间的生物工程效应。我们收集了2012年至2014年有关植被类型，密度和根系形态的详细数据，并测量了整个山谷的剖面。此外，我们评估了碎片谷内生长的三个不同年龄的刺槐假单胞菌的三个单种林分的根系发育所提供的增加的土壤内聚力，并且从更大程度上评估了它们对河道形态的影响。这些数据被合并到BSTEM（银行稳定性和脚趾侵蚀模型）和细胞辫状流模型的修改形式中。结果表明，随着年龄的增长，银行的FOS（安全系数）将显着增加，而模拟洪水事件在山谷中造成的洪水面积平均将减少18-24％。随后，将现场数据整合到细胞模型中，以模拟泥沙运动和植被对河道动力学的影响。结果表明，植被提供的稳定性可能导致较不活跃的山谷系统，而总体而言，控制碎片的植被的发展可能对生态系统的恢复做出重大贡献。但是，精心管理对于最佳利用植被至关重要。 （C）2017 Elsevier B.V.保留所有权利。

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