分层岸滩侧蚀坍塌过程及其水动力响应模拟

摘要
图/表
参考文献
相关文章 (13)

全文: PDF (1391 KB) HTML ()
输出: BibTeX | EndNote (RIS)

摘要非均质岸滩广泛分布于冲积河流中，其侧蚀过程沿垂向具有分层特点。基于全三维水沙模型及河岸侧蚀坍塌力学模式，提出动态网格跟踪技术，构建了非均质岸滩侧蚀沿垂向差异的三维动力学模拟方法。以连续弯道概化水槽为例，模拟分析了非均质河岸侧蚀过程中三维水流结构的响应特征。研究结果表明：坡脚冲刷后，底部主流向凹岸偏移，在已有弯道环流的基础上，于坡脚处出现一反向次生流；上部粘性土层坍塌后，崩塌土体堆积于坡脚处，上部主流明显左偏，下部次生流消失；随着坡脚堆积体的冲刷搬运，下部主流进一步向凹岸偏移；如此循环，主流不断向凹岸偏移，致使岸坡持续崩退、河道摆动。

	服务

	把本文推荐给朋友
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	假冬冬
	黑鹏飞
	邵学军
	张幸农

关键词 ：非均质岸滩, 侧蚀坍塌, 水流结构, 三维数值模拟

Abstract：Riverbanks with composite materials are commonly found on alluvial rivers. Lateral erosion processes of such banks are very different along the vertical direction. On the basis of three-dimensional (3-D) flow and sediment transport model and mechanisms of riverbank erosion, a 3-D numerical method was developed for simulating bank erosion processes with composite materials using the adaptive grid scheme. The 3-D numerical method is applied to a conceptual meandering channel, and to simulate the variation of 3-D flow structure as erosion of the bank progresses. Results show that the main flow migrates towards the concave bank after the erosion of bank toes, and then, a new secondary flow structure with reverse direction compared to the initial secondary flow structure is formed on the bank toe. The main flow migrates further towards the concave bank after the collapse of upper layers, and the new secondary flow structure on the bank toe disappears. Again, the main flow migrates towards the concave bank after the erosion of bank toes. Thus, the main flow migrates towards the concave bank step by step, resulting in a continue bank erosion and channel migration.

Key words： riverbanks with composite materials bank erosion processes flow structures 3-D numerical simulation

收稿日期: 2013-05-03

中图分类号:

TV147

基金资助:"十二五"国家科技支撑计划资助项目（2012BAB04B03）；国家自然科学基金资助项目（51109140）

作者简介: 假冬冬（1982-），男，广西桂林人，博士，主要从事河流海岸动力学研究。E-mail：ddjia@nhri.cn

引用本文:

假冬冬, 黑鹏飞, 邵学军, 张幸农. 分层岸滩侧蚀坍塌过程及其水动力响应模拟[J]. , 2014, 25(1): 83-89. JIA Dongdong, HEI Pengfei, SHAO Xuejun, ZHANG Xingnong. Numerical simulation of bank erosion processes with composite materials and variations in flow structure. , 2014, 25(1): 83-89.

链接本文:

http://journal16.magtechjournal.com/Jweb_skxjz/CN/ 或 http://journal16.magtechjournal.com/Jweb_skxjz/CN/Y2014/V25/I1/83

[1]	MOTTA D, ABAD J D, LANGENDOEN E J, et al. A simplified 2-D model for meander migration with physically-based bank evolution [J]. Geomorphology, 2012,163:10-25.
[2]	WANG Hong, ZHOU Gang, SHAO Xuejun. Numerical simulation of channel pattern changes:Part Ⅰ: Mathematical model[J]. International Journal of Sediment Research, 2010(4): 366-378.
[3]	WANG Guangqian, XIA Junqiang, WU Baosheng. Numerical simulation of longitudinal and lateral channel deformations in the braided reach of the lower Yellow River[J]. Journal of Hydraulic Engineering, ASCE, 2008, 134(8):1064-1078.
[4]	DONG Chen, DUAN J G. Case study: Two-dimensional model simulation of channel migration processes in west Jordan River, Utah[J]. Journal of Hydraulic Engineering, ASCE, 2008,134(3):315-327.
[5]	钟德钰, 张红武. 考虑环流横向输沙及河岸变形的平面二维扩展数学模型[J].水利学报, 2004,35(7):14-20. (ZHONG Deyu, ZHANG Hongwu. Extended 2-D numerical model for alluvial river considering transverse transport of sediment and bank erosion due to secondary flow in river bends[J]. Journal of Hydraulic Engineering,2004,35(7):14-20. (in Chinese))
[6]	JIA Dongdong, SHAO Xuejun, WANG Hong, et al. Three-dimensional modeling of bank erosion and morphological changes in the Shishou bend of the middle Yangtze River[J]. Advances in Water Resources, 2010, 33(3):348-360.
[7]	假冬冬, 邵学军, 王虹, 等. 考虑河岸变形的三维水沙数值模拟研究[J].水科学进展, 2009, 20(3): 311-317. (JIA Dongdong, SHAO Xuejun, WANG Hong, et al. Three dimensional mathematical modeling for fluvial processes considering bank erosion[J]. Advances in Water Science, 2009, 20(3):311-317. (in Chinese))
[8]	假冬冬. 非均质河岸河道摆动的三维数值模拟[D]. 北京: 清华大学, 2010. (JIA Dongdong. Three-dimensional numerical simulation of lateral migration of alluvial channels with composite banks[D]. Beijing: Tsinghua University, 2010. (in Chinese))
[9]	FUKUOKA Shoji.自然堤岸冲蚀过程的机理[J].水利水电快报,1996(2):29-33.(FUKUOKA Shoji. Mechanisms of the erosion processes of natural dike banks[J]. Express Water Resources and Hydropower Information, 1996(2): 29-33. (in Chinese))
[10]	余文畴,卢金友. 长江河道崩岸与护岸[M]. 北京: 中国水利水电出版社, 2008. (YU Wenchou, LU Jinyou. Bank failure and protection in the Yangtze River [M]. Beijing: China Water and Power Press, 2008. (in Chinese))
[11]	OSMAN A M, THORNE C R. Riverbank stability analysis: I:Theory[J]. Journal of Hydraulic Engineering, ASCE, 1988,114(2):134-150.
[12]	假冬冬, 张幸农, 应强, 等. 流滑型崩岸河岸侧蚀模式初探[J]. 水科学进展, 2011, 22(6): 813-817. (JIA Dongdong, ZHANG Xingnong, YING Qiang, et al. Preliminary study on the analytical model for slide collapse of riverbanks [J]. Advances in Water Science, 2011, 22(6): 813-817.(in Chinese))
[13]	黄本胜,白玉川,万艳春. 河岸崩塌机理的理论模式及其计算[J]. 水利学报, 2002, 33(9): 49-54. (HUANG Bensheng, BAI Yuchuan, WAN Yanchun. Model for dilapidation mechanism of riverbank[J]. Journal of Chinese Hydraulic Engineering, 2002,33(9): 49-54.(in Chinese))
[14]	王延贵,匡尚富. 河岸临界崩塌高度的研究[J]. 水利学报, 2007, 38(10): 1158-1165. (WANG Yangui, KUANG Shangfu. Critical height of bank collapse[J]. Journal of Chinese Hydraulic Engineering, 2007, 38(10): 1158-1165.(in Chinese))
[15]	胡德超, 钟德钰, 张红武, 等.三维悬沙模型及河岸边界追踪方法:Ⅱ:河岸边界追踪[J].水力发电学报,2010,29(6):106-113. (HU Dechao, ZHONG Deyu, ZHANG Hongwu, et al. 3-D suspended-load model and moveable river bank tracking:Part 2:Tracking of moveable river bank [J]. Journal of Hydroelectric Engineering, 2010,29(6):106-113. (in Chinese))
[16]	WANG Bo, JIA Dongdong, ZHOU Gang, et al. An experimental investigation on flow structure in channel with consecutive bends[C]//16th IAHR-APD Congress and 3rd IAHR-ISHS. Beijing: Tsinghua University Press, 2008.