三峡库区箭穿洞危岩体涌浪数值模拟分析

刘广宁; 黄波林; 王世昌; 陈小婷

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raybet体育在线院报 ›› 2013, Vol. 30 ›› Issue (10) : 37-41.

工程安全与灾害防治

三峡库区箭穿洞危岩体涌浪数值模拟分析

刘广宁^1,2,黄波林¹,王世昌¹,陈小婷¹

作者信息 +

Numerical Simulation on Waves Generated by the Instability of Jianchuandong Perilous Rock in Three Gorges Reservoir Area

LIU Guang-ning^1,2, HUANG Bo-lin¹, WANG Shi-chang¹, CHEN Xiao-ting¹

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摘要

以三峡库区巫山县箭穿洞危岩体为研究对象,在库水位175 m、坐滑式完全入水工况条件下,进行库岸长度6 km的涌浪数值模拟分析。该数值计算可以形成涌浪瞬时水面、河道浪高分布、最大爬坡及预警分布图。结果表明:该工况下产生的最大涌浪高度为32.1 m,在对岸最大爬坡高度为24.1 m。通过涌浪沿河道传播过程,得出沿程传播分为急剧衰减区和平缓衰减区。急剧衰减区呈指数函数形式下降,平均100 m内涌浪下降高度为4 m,该急剧衰减区约有800 m长,上下游各400 m长,是涌浪危害航道的重点区域;平缓衰减区呈缓斜线形式下降,平均100 m内涌浪下降高度为0.1～0.2 m。根据该规律,箭穿洞危岩体失稳产生的涌浪传至巫山县城的浪高在1～2 m,抱龙河岸坡浪高在1.5～2.5 m,培石浪高在1.0～1.5 m。该分析方法可为涌浪灾害的预测、风险评价提供参考意义。

Abstract

Waves generated by the instability of perilous rockmass were numerically simulated. The Jianchuandong perilous rockmass at Wushan county in the Three Gorges Reservoir area was taken as the research object. In the simulation, the reservoir water level was set as 175m, the perilous rock completely sit-slid into the water, and the simulated length of bank slope was 6 km. Diagrams of instantaneous water surface, wave height in the waterway, and maximum climb-height of wave and pre-warning were obtained. Results revealed that under the simulation condition, the maximum wave height was 32.1m, and the maximum climb-height of wave at the opposite bank was 24.1m. Furthermore, the wave propagation along the channel was divided into sharp attenuation and gentle attenuation. The sharp attenuation lasted for 800m, 400m in the upstream and another 400m in the downstream, which is the most perilous navigation area affected by the wave. In this area, the wave height declined in an exponential function, averaging 4m per 100m length. Whereas in the gentle attenuation area, the wave height declined in a slow gradual curve, averaging 0.1- 0.2m per 100m. According to this regularity, the height of waves which propagates to Wushan county was 1-2m, 1.5-2.5m at the bank slope of Baolong river, and 1.0-1.5m at Peishi township. The method in this research could serve as a reference for the prediction and risk assessment of wave disaster.

导出引用

刘广宁,黄波林,王世昌,陈小婷. 三峡库区箭穿洞危岩体涌浪数值模拟分析[J]. raybet体育在线院报. 2013, 30(10): 37-41

LIU Guang-ning, HUANG Bo-lin, WANG Shi-chang, CHEN Xiao-ting. Numerical Simulation on Waves Generated by the Instability of Jianchuandong Perilous Rock in Three Gorges Reservoir Area[J]. Journal of Changjiang River Scientific Research Institute. 2013, 30(10): 37-41

中图分类号： TV139.232 TV131.4

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