丁坝群几何参数对支流斜交弯曲干流河道水流的影响

发布时间：2019-03-12 14:00

【摘要】：天然河道中交汇河道很多，，干支交汇河段并非单一形状的直线段，支流在交汇段多呈顺直状，干流河道多呈弯曲状，是一种常见的水流现象。干支水流交汇后，交汇区内水流复杂，紊动性强，水流掺混作用剧烈。支流来水较大时，水流相互作用，对干流河道岸坡造成冲刷破坏，，在一定范围内对下游河岸的稳定造成威胁。因此，在支流斜交弯曲干流河道下游堤岸布置护岸工程是十分必要的。护岸工程中，丁坝是最为普遍的一种护岸方式。丁坝附近水流复杂多变，目前为止，对丁坝周围水流流态的研究并没有一套具体而完整的理论基础。实际工程中，河道边界多变，水流结构复杂，影响支流斜交弯曲干流河道水流结构的因素非常之多，其中针对丁坝群几何参数对该河道水流影响的研究甚少。本次实验以丁坝群为护岸方式，在理论学习研究、室内物理模型试验和理论分析的基础上，研究了丁坝群几何参数对支流斜交弯曲干流型河道水流的影响，着重分析了坝长与间距等因素对该段水流的影响。所做的主要工作和研究成果如下：首先，试验通过大量理论研究与文献资料整理，分析支流入汇弯曲干流河道水流水力特性，通过理论分析，在下游凹岸侧采用布置丁坝群为护岸工程。其次，通过物理模型试验，运用Flow Tracker对测量点进行数据采集，整理数据，通过数据处理着重分析了坝长及间距对支流入汇弯曲干流河道水流的影响。最后，通过方案对比，分析了丁坝群几何参数对入汇河道下游水流水力特性的影响，为丁坝群在支流斜交弯曲干流河道的护岸工程提供了重要的参考依据。
[Abstract]:There are a lot of confluence channels in natural river course. The intersection section of trunk and branch is not a single straight line section. The tributaries tend to be straight in the intersection section, and the main stream channels are more curved, which is a common phenomenon of water flow. The water flow in the intersection area is complicated, turbulence is strong, and the mixing effect of the water flow is intense after the intersection of the dry-branch flow and the branch flow. When the tributaries come in a large amount of water, the interaction of the water flow will cause scour and damage to the bank slope of the main stream, and threaten the stability of the downstream banks within a certain range. Therefore, it is very necessary to arrange the bank protection project in the downstream bank of the oblique and curved main stream of tributaries. In the engineering of bank protection, the spur dam is one of the most common ways of bank protection. The flow around the spur-dike is complicated and changeable. So far, there is no concrete and complete theoretical basis for the study of the flow pattern around the spur-dike. In practical engineering, the river boundary is changeable, the flow structure is complex, and there are many factors affecting the flow structure of the tributaries with oblique and curved main stream, among which, few researches have been done on the influence of the geometric parameters of the dingba group on the river flow. In this experiment, on the basis of theoretical study, laboratory physical model test and theoretical analysis, the influence of geometric parameters of Dingba Group on the flow of tributaries with oblique bending main flow pattern was studied, on the basis of theoretical study, laboratory physical model test and theoretical analysis, taking the Dingba Group as the bank protection mode. The influence of dam length and spacing on the flow is emphatically analyzed. The main work and research results are as follows: first of all, through a large number of theoretical research and literature collation, the hydraulic characteristics of the tributaries into the curved main channel are analyzed, and the theoretical analysis is carried out. On the downstream side of the concave bank, the dike group is used as the bank protection project. Secondly, through the physical model test, the Flow Tracker is used to collect the data of the measured points and collate the data. Through the data processing, the influence of the dam length and distance on the flow of the tributaries into the curved main stream channel is analyzed emphatically. Finally, through the scheme comparison, the influence of the geometric parameters of the dam group on the hydraulic characteristics of the downstream flow in the inlet channel is analyzed, which provides an important reference basis for the bank protection project of the dam group in the oblique and curved main stream channel of the tributaries.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV863

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