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非黏性堤防溃口发展过程计算模型

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堤防是防洪工程体系的重要组成部分,一旦发生溃决将可能带来严重灾害损失,明确堤防溃口发展速率与水力要素之间的关系对于预测堤防溃决过程和洪水演进具有重要意义.通过对系列非黏性沙质堤防溃决试验结果进行整理分析,得到溃口垂向下切速率、横向展宽速率与溃口流量、溃口单宽流量之间的关系.结果表明:堤防溃口发展主要存在垂向冲刷、横向扩展2种形式;溃口发展速率与溃口流量呈正相关,但受入流流量影响,没有适用于所有工况的关系表达式;溃口发展速率与溃口单宽流量间的关系基本不受入流流量影响,下切和展宽速率与溃口单宽流量呈现指数关系;基于此关系,构建了以溃口单宽流量为参数的溃口发展过程计算模型,并对溃口垂向下切、横向展宽发展过程进行了模拟计算与对比分析,结果显示模拟情况与真实的溃口发展过程吻合较好,说明所提出的计算模型科学合理,且计算过程简洁.
Breach Development Model of Non-cohesive Embankment
Embankments play a vital role in flood control engineering systems,and any breach in these embank-ments can result in severe disaster losses.Therefore,it is crucial to understand the relationship between the devel-opment rate of embankment breaches and hydraulic factors to accurately predict breach processes and flood evolu-tion.By analyzing experimental data from series breach tests of non-cohesive sandy embankments,we obtained the relationship between hydraulic factors(discharge and unit-width discharge)and breach development rates(trans-verse widening rate and vertical down-cutting rate).Findings reveal two major developments of breach,namely,transverse widening and vertical down-cutting.Breach discharge rate is positively correlated with breach develop-ment rate,although the specific relationship depends on inflow conditions,making it difficult to express uniformly for all experimental scenarios.Nonetheless,an exponential relationship exists between unit-width discharge and breach development rate.Based on this relationship,a calculation model is established with unit-width discharge as a parameter to simulate and analyze the development process of breaches,including transverse widening and vertical down-cutting.The results demonstrate a strong agreement between the simulated situation and the actual breach de-velopment process,thus confirming the accuracy,scientific validity,and simplicity of the calculation model.

non-cohesive embankmentbreach dischargeunit-width discharge at breachdown-cutting ratetransverse widening ratecomputational model of breach development process

段文刚、刘备、黄卫

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长江科学院水力学研究所,武汉 430010

非黏性堤防 溃口流量 溃口单宽流量 下切速率 展宽速率 溃口发展过程计算模型

国家自然科学基金项目国家重点研发计划项目中央级公益性科研院所基本科研业务费项目

519790072018YFC1508002CKSF2019477+SL

2024

10.11988/ckyyb.20230104

长江科学院院报
长江科学院

长江科学院院报

CSTPCD北大核心
影响因子：0.618
ISSN：1001-5485
年,卷(期)：2024.41(2)
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