分流对引黄灌区渠道淤积的影响研究

发布时间：2018-09-12 16:14

【摘要】：为满足灌溉要求,引黄灌区渠道沿程通常设置不同形式的分水涵闸进行分流。渠道分水分沙机理及分流对渠道原有输沙能力的影响研究是灌区系统水沙资源优化配置的基础。在分流水流流态已有研究成果的基础上,利用含沙量垂线分布理论公式,推导得到渠道自流分流时分沙比与分流比呈0.9次幂关系式,并利用灌区引水含沙量与大河含沙量的统计数据进行了验证。此外,根据建立的分沙比关系式进一步分析了分流条件下保持渠道原有输沙能力的临界条件,说明了渠道分流通常会增加原渠道的淤积,进而在分沙比关系式及输沙能力公式的基础上建立了渠道淤积比与分流比的关系式,经数值分析可知淤积比随着分流比的增大先增大后减小。
[Abstract]:In order to meet the requirements of irrigation, different forms of diversion culverts are usually set up along the channel in the Yellow River diversion Irrigation area. The study on the mechanism of water and sediment separation and the influence of diversion on the original sediment transport capacity of the canal is the basis for the optimal allocation of water and sediment resources in the irrigation area system. On the basis of the existing research results of the distributary water flow state, using the theoretical formula of the vertical distribution of sediment content, the author deduces the 0.9 power relation between the time division sand ratio and the distributary ratio of the channel self-flow. The statistical data of sediment concentration in irrigation area and river were verified. In addition, according to the relationship between sediment distribution and sediment distribution, the critical conditions for maintaining the original sediment transport capacity of the channel under the condition of diversion are further analyzed, and it is shown that the channel diversion usually increases the siltation of the original channel. On the basis of the relationship between sediment separation ratio and sediment transport capacity, the relationship between siltation ratio and diversion ratio is established. The results show that the silt ratio increases first and then decreases with the increase of the distribution ratio.
【作者单位】：中国水利水电科学研究院流域水循环模拟与调控国家重点实验室;
【基金】：国家重点研发计划项目(2016YFC0402407) 国家自然科学基金资助项目(51309255)
【分类号】：TV146

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