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	单个阶梯-深潭破坏的力学模型
	张晨笛 ; 王兆印 ; 李志威 ; 李文哲 ; ZHANG Chen-di ; WANG Zhao-yin ; LI Zhi-wei ; LI Wen-zhe
	2016-03-30 ; 2016-03-30
关键词	阶梯-深潭 稳定性 临界流量 冲刷 Enteric nervous system(ENS) Development Signaling pathway Hirschsprung disease TV143
其他题名	A physically-based model of individual step-pool failure
中文摘要	阶梯-深潭系统是山区河流广泛分布的重要河床结构,其破坏机理对于认识山区河流稳定性及河床演变具有重要意义。针对单个阶梯-深潭,以关键石块为研究对象,综合考虑上游来水条件、下游冲刷和泥沙环境,建立单个阶梯稳定性的理论模型。基于理论模型,分析弱输沙条件下阶梯破坏的临界条件和失稳机制。结果表明:(1)河道比降、关键石块粒径、来流流量、下游冲刷和互锁作用是弱输沙条件下影响单个阶梯-深潭稳定性的关键因素。(2)来流恒定时阶梯下游冲刷降低阶梯稳定性。阶梯失稳临界流量随冲刷增强而减小,因此水流破坏作用表现为阶梯下游坡脚冲刷降低失稳临界流量,同时来流增加超过临界流量导致破坏。(3)互锁作用可有效提升阶梯稳定性,并在阶梯坡脚冲刷程度较大时明显提升失稳临界流量,这是阶梯在一般洪水中维持稳定的方式。; Step-pool system is one of the most important and widespread bed forms in mountain rivers.The failure mechanism of step-pools,although poorly understood,plays a significant role on the stabilityand fluvial process of mountain river bed. Combined with effects of water discharge,downstream scour ofthe step and sediment environment,the forces of the keystone in step-pool formation are schemed and analyzed so as to advance a new theoretical model for individual step-pool stability. The model illustrates thatchannel gradient,keystone diameter,discharge,downstream scour angle and interlocking effect are the keyfactors that influence the stability. Downstream scour reduces step-pool stability if the discharge remainsconstant and bed load transport remains low. With stronger scour, critical discharge for failure becomessmaller. Therefore,strong flow breaches the step because the discharge surpasses the critical discharge lowered by downstream scour. Step-pool stability can be largely strengthened by interlocking effect,especiallyif downstream scour angle is large,which is a self-protection mechanism for step-pool system.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/148808]
专题	清华大学
推荐引用方式 GB/T 7714	张晨笛,王兆印,李志威,等. 单个阶梯-深潭破坏的力学模型[J],2016, 2016.
APA	张晨笛.,王兆印.,李志威.,李文哲.,ZHANG Chen-di.,...&LI Wen-zhe.(2016).单个阶梯-深潭破坏的力学模型..
MLA	张晨笛,et al."单个阶梯-深潭破坏的力学模型".(2016).

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