[1]张康,王兆印,刘怀湘,等.裂点发育及其对堰塞坝的稳定性影响[J].山地学报,2011,(04):474.
　ZHANG Kang,WANG Zhaoyin,LIU Huaixiang,et al.Effect of Knickpoint Development in Controlling the Stability of the Landslide Dam[J].Mountain Research,2011,(04):474.
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裂点发育及其对堰塞坝的稳定性影响()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2011年04期
页码:
474
栏目:
山地学报
出版日期:
2011-01-01

文章信息/Info

Title:
Effect of Knickpoint Development in Controlling the Stability of the Landslide Dam
作者:
张康;王兆印;刘怀湘;余国安;
1. 清华大学水沙科学与水利水电工程国家重点实验室，北京 10084；
2. 南京水利科学研究院，水文水资源与水利工程科学国家重点实验室，江苏 南京 210029；
3. 中国科学院地理科学与资源研究所，北京 100101
Author(s):
ZHANG Kang;  WANG Zhaoyin;  LIU Huaixiang; YU Guoan
1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;
2. State Key Laboratory of HydrologyWater Resources and Hydraulic engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China;
3. Institute of Geographic Sciences and Natural Resources Research, Chinese Academic Science, Beijing 100101, China
关键词:
堰塞坝; 阶梯-深潭系统; 裂点; 河床下切; 汶川地震
Keywords:
landslide dams; steppool system; Knickpoint; riverbed incision; Wenchuan earthquake
分类号:
P93191
文献标志码:
A
摘要:
通过野外调查及试验对堰塞坝的稳定和裂点的发育进行研究,发现堰塞坝的稳定性主要取决于泄洪道内阶梯-深潭系统的发育程度Sp和坝体上游洪峰的水流能量p。堰塞坝的保存与溃决情况采用保留的坝高比进行定量描述,对于洪峰流量小于30 m3/s山区河流,保留坝高比与Sp呈线性相关;洪峰流量大于30 m3/s(
Abstract:
This paper studies the stability of landslide dams and development of knickpoints by field investigations and experiments, and analyzing satellite images. The stability of landslide dams depends mainly on the development of steppool system and stream power of the flood flow. The development degree of steppool system is represented by a parameter Sp, which was measured with a specially designed instrument. A preservation ratio of landslide dams is defined as the ratio of preserved height after flood scouring to the original height of the dam. For streams with peak flood discharge lower than 30 m3/s, the preservation ratio is linearly proportional to Sp. For rivers with peak flood discharge higher than 30 m3/s (30 - 30 000 m3/s), the minimum Sp value for stable channel increases with the unit stream power p. For a landslide dam with poorly developed steppool system, Sp is smaller than the minimum value and the outburst flood incises the spillway channel and causes failure of the dam. For preserved landslide dams with sediment deposits in the quake lakes, a knickpoint may be developed if it is stabilized by longterm action of the flow. Large knickpoints can totally change the fluvial processes and river morphology. If hundreds of landslide dams occurred simultaneously on a reach of a mountain river, the potential energy of bank failure and the slope erosion are greatly reduced and sediment yield from the watershed may be reduced nearly to zero. The quake lakes may be preserved for long term and become beautiful landscapes. Streams with long term unfilled quake lakes have good aquatic ecology.

相似文献/References:

[1]白永健,倪化勇,王运生,等.喜德采书组“8?31”滑坡工程地质特征及运动过程[J].山地学报,2014,(03):327.
　BAI Yongjian,NI Huayong,WANG Yusheng,et al.Engineering Geological Characteristics and Motor Process of Caishu Landslide in Xide of Sichuan，China[J].Mountain Research,2014,(04):327.

备注/Memo

备注/Memo:
收稿日期(Received date)：2010-08-10；改回日期(Accepted) :2010-11-03。
基金项目（Foundation item）：国家973计划资助项目（2008CB425803）；清华大学水沙科学及水利水电工程国家重点实验室自主课题资助项目(2009-ZY-2)；优秀国家重点实验室研究项目基金(50823005)。\[Supported by the National Basic Research Program of China (2008CB425803), the State Key Laboratory of Hydroscience and Engineering (2009-ZY-2), and the Excellent State Key Laboratory of China (50823005).\]
作者简介（Biography）：张康（1981-），男，新疆莎车人，博士研究生，研究方向河流综合管理。\[Zhang Kang (1981- ), male, Ph.D. Candidate, researched on integrated river management.\] E-mail: zhang-k08@mails.tsinghua.edu.cn
更新日期/Last Update: 1900-01-01