摘要
针对黄河下游河道特点及高含沙洪水演进特性,建立基于耦合解法的一维非恒定流非均匀沙数学模型.利用该模型计算黄河下游2004年8月的高含沙洪水过程,采用实测水沙资料对模型进行验证.验证结果表明,各水文站的流量、含沙量等计算值与实测值吻合较好,所建模型可以用于模拟高含沙洪水演进及冲淤过程.采用该模型计算不同断面间距条件下同场次的高含沙洪水过程,分析不同断面间距下的计算结果.分析表明:不同断面间距对一维模型的计算精度有一定影响,在计算边界条件及其他参数取值相同的条件下,计算断面间距对流量及水位的影响相对较小,对含沙量及河道冲淤过程的影响较明显.在黄河下游地形及水沙特性均复杂的情况下,采用一维数学模型计算高含沙洪水过程时,应适当考虑断面间距的影响.
A one-dimensional coupled morphodynamic model was developed to simulate the routing of hyperconcentrated floods and the process of channel evolution in the Lower Yellow River（LYR）.The model was applied to simulate the 2004 hyperconcentrated flood event occurring in the LYR,with the measured data of discharge and sediment concentration being used to calibrate the model.The model predictions accorded with the observed data.The calibrated model was used to simulate the same flood event under five scenarios with different space increments.The effect of different space increments on the simulation results was analyzed.Different space increments can influence the predicative accuracy of the proposed model.The effects on the simulated discharges and water levels were relatively lower,compared with the effects on the concentrations and channel evolution volumes.It is necessary to adopt a suitable cross-sectional spacing when simulating hyperconcentrated floods occurring in the LYR using a morphodynamic model.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2016年第4期735-743,共9页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(51379156
51579186)
水利部公益性行业科研专项经费资助项目(201401038)
关键词
高含沙洪水
耦合模型
断面间距
黄河下游
hyperconcentrated flood
coupled morphodynamic model
cross-sectional spacing
Lower Yellow River
