[1]赵洋,李守义.堰塞体逐渐溃决数学模型研究[J].自然灾害学报,2020,29(03):129-137.[doi:10.13577/j.jnd.2020.0314]
 ZHAO Yang,LI Shouyi.Research on mathematical model of gradual collapse of sputum[J].,2020,29(03):129-137.[doi:10.13577/j.jnd.2020.0314]
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堰塞体逐渐溃决数学模型研究
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
29
期数:
2020年03期
页码:
129-137
栏目:
出版日期:
2020-06-28

文章信息/Info

Title:
Research on mathematical model of gradual collapse of sputum
作者:
赵洋12 李守义1
1. 西安理工大学 水利水电学院, 陕西 西安 710048;
2. 陕西省水务集团有限公司, 陕西 西安 710068
Author(s):
ZHAO Yang12 LI Shouyi1
1. College of Water Resources and Hydropower, Xi’an University of Technology, Xi’an 710048, China;
2. Shaanxi Water Affair Group Co., Ltd., Xi’an 710068, China
关键词:
堰塞体逐渐溃决明渠出流冲刷率洪峰流量断面最大流速
Keywords:
dam bodygradual collapseopen channel outflowflushing rateflood peak flowmaximum flow velocity of the section
分类号:
TV131.4TV314X9
DOI:
10.13577/j.jnd.2020.0314
摘要:
堰塞体是高位岸坡在地震作用下滑坡导致正常河道被堵塞而形成的天然堆石体。根据堰塞体溃决的特点采用有底坡明渠出流形式,结合冲刷率与速度平方成正比的关系建立堰塞体逐渐溃决数学模型。对"10·10"白格堰塞体溃决过程计算分析,结果表明:当冲刷系数α=0.0007~0.0009,糙率n=0.030~0.035时,溃决洪峰流量为8813.04~14087.49m3/s之间,与实测值相比,洪峰流量误差在32%之内。当采用冲刷率与流速的平方成正比的冲刷方式时,建议冲刷模型系数α在0.0007~0.0009之间选取,可降低计算结果误差。增大泄流槽的糙率n,减少冲刷系数α,可以减少溃决洪峰流量,延缓洪峰流量出现时间。边坡角度θ对于洪峰出现时间、断面最大流速、洪峰流量大小影响都较小。
Abstract:
The dam body is a natural irregular dam formed by the high bank slope in the landslide caused by the earthquake, which causes the normal channel to be blocked. Combined with the characteristics of the dammed body collapse, the outflow pattern of the bottom slope open channel is used, and the mathematical model of the gradual collapse of the dam body is established based on the relationship between the scouring rate and the square of the velocity. Taking the 10·10 white grid collapse as an example, the calculation results show that when the erosion coefficient α=0.0007~0.0009, n=0.030~0.035, the peak flow rate is between 8813.04~14087.49m3/s, compared with the measured value. The peak flow error is with in 32%. When the scouring method is used, the scouring rate is proportional to the square of the velocity. It is recommended that the scouring model coefficient α was selected between 0.0007~0.0009, which can reduce the error of the calculation result. Increasing the roughness coefficient n of the drain groove and reducing the size of the flushing coefficient α can reduce the peak flow rate and delay the occurrence of flood peak flow. The slope angle θ has little effect on the peak arrival time, the maximum flow velocity of the section, and the peak flow size.

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相似文献/References:

[1]赵洋,李守义.考虑上游洪水因素下土石坝溃决流量研究[J].自然灾害学报,2019,28(04):062.[doi:10.13577/j.jnd.2019.0407]
 ZHAO Yang,LI Shouyi.Research on earth-rock dam breach flow based on upstream flood factors[J].,2019,28(03):062.[doi:10.13577/j.jnd.2019.0407]

备注/Memo

备注/Memo:
收稿日期:2019-06-10;改回日期:2020-02-09。
基金项目:国家自然科学基金项目(51579208)
作者简介:赵洋(1993-),男,硕士研究生,主要从事洪水演进数值模拟和结构应力仿真分析.E-mail:378277714@qq.com
通讯作者:李守义(1955-),男,教授,主要从事水工结构应力仿真分析和结构优化设计.E-mail:lishouyi@126.com
更新日期/Last Update: 1900-01-01