Bio-engineering Mitigation Debris of Flow

生物工程减缓泥石流

• 批准号: 1846851
• 金额: --
• 依托单位: University of Dundee
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1846851
• 关键词: Bio; engineering; Mitigation; Debris; Flow

Under the impact of climate change, rainfall-induced debris flow events have been increasingly reported and these have led to significant socio-economic losses. Existing mitigation methods include concrete baffles, but these methods have high embodied CO2 that would further promote climate change. Slope bioengineering such as brush layering [1] is an alternative, "green" and low-carbon technique (Fig. 1). Plant shoot might be used to attenuate the debris impact energy, and subsequently the root pull-out resistance may be mobilised to resist against the drag force induced on the plant. There is, however, no study evaluating such soil-plant-debris interaction and its effect on debris flow mobility. The aim of this PhD project is to investigate the effectiveness of using brush layering to reduce the mobility of a debris flow mass. The objectives of this project are to(i) Determine the drag force exerted on plant shoot during the transport of a debris mass;(ii) Quantify the soil-root mechanical pull-out resistance against the drag force;(iii) Quantify the reduced mobility of a flow mass due to bioengineering mitigation; and(iv) Evaluate the performance of brush layering technique against rigid baffles method;A new large-scale experimental flume will be developed for modelling different debris flow events. Brush layering will be modelled by 3-D printing some representative plant traits [2], hence (i) removing the need to wait for the plant growth and (ii) enabling repeatable results. Debris flow event with a known volume of dry granular soil will be triggered at the upstream of the flume. Any changes of the flow characteristics of a debris mass across the brush layering will be monitored and compared with cases without bioengineering mitigation, and cases that mitigated by rigid baffles. Any favourable plant traits and plant arrangement that could enhance the performance of the bioengineering technique will be identified.References:Stokes, A., et al. 2015. Ecological mitigation of hillslope instability: ten key issues facing researchers and practitioners. Plant and Soil, 377: 1 - 23.Liang, T., et al. 2014. Modelling the seismic performance of rooted slope from individual root-soil interaction to global slope behaviour, Geotechnique, 65(12): 995 - 1009.

在气候变化的影响下，越来越多地报告了降雨引起的碎屑流动事件，并导致了重大的社会经济损失。现有的缓解方法包括混凝土挡板，但是这些方法具有较高的体现二氧化碳，可以进一步促进气候变化。斜率生物工程（例如刷子分层[1]）是一种替代性的“绿色”和低碳技术（图1）。植物芽可用于衰减碎屑撞击能量，随后可以动员根拉力抗性以抵抗植物上诱导的阻力。但是，尚无研究评估这种土壤植物膜相互作用及其对碎屑流迁移率的影响。该博士学位项目的目的是研究使用刷子分层以减少碎屑流量的迁移率的有效性。该项目的目标是（i）确定碎屑质量运输过程中植物芽上施加的阻力；（ii）量化土壤 - 根 - 对阻力力的机械拉力抗性；（iii）量化由于生物发动机缓解量而导致流动质量的降低； （iv）评估对刚性挡板方法的刷子分层技术的性能；将开发出一种新的大规模实验水槽，以建模不同的碎屑流动事件。刷子分层将通过3-D打印一些代表性的植物特征[2]来建模，因此（i）消除了等待植物生长的需要，以及（ii）实现可重复的结果。在水槽的上游将触发带有已知颗粒土壤的碎屑流动事件。将监测整个刷子分层碎屑质量的流动特性的任何变化，并将其与没有生物工程缓解的病例以及通过刚性挡板缓解的病例进行比较。将确定任何有利的植物特征和植物布置，以增强生物工程技术的性能。参考：Stokes，A。等。 2015年。山坡不稳定性的生态缓解：研究人员和从业者面临的十个关键问题。植物和土壤，377：1-23.Liang，T。等。 2014。建模根斜率从单个根部土壤相互作用到全局斜率行为的地震性能，Geotechnique，65（12）：995-1009。