【摘要】：天然河道中交匯河道很多，，干支交匯河段并非單一形狀的直線段，支流在交匯段多呈順直狀，干流河道多呈彎曲狀，是一種常見的水流現(xiàn)象。干支水流交匯后，交匯區(qū)內(nèi)水流復(fù)雜，紊動性強，水流摻混作用劇烈。支流來水較大時，水流相互作用，對干流河道岸坡造成沖刷破壞，，在一定范圍內(nèi)對下游河岸的穩(wěn)定造成威脅。因此，在支流斜交彎曲干流河道下游堤岸布置護(hù)岸工程是十分必要的。 護(hù)岸工程中，丁壩是最為普遍的一種護(hù)岸方式。丁壩附近水流復(fù)雜多變，目前為止，對丁壩周圍水流流態(tài)的研究并沒有一套具體而完整的理論基礎(chǔ)。實際工程中，河道邊界多變，水流結(jié)構(gòu)復(fù)雜，影響支流斜交彎曲干流河道水流結(jié)構(gòu)的因素非常之多，其中針對丁壩群幾何參數(shù)對該河道水流影響的研究甚少。 本次實驗以丁壩群為護(hù)岸方式，在理論學(xué)習(xí)研究、室內(nèi)物理模型試驗和理論分析的基礎(chǔ)上，研究了丁壩群幾何參數(shù)對支流斜交彎曲干流型河道水流的影響，著重分析了壩長與間距等因素對該段水流的影響。所做的主要工作和研究成果如下： 首先，試驗通過大量理論研究與文獻(xiàn)資料整理，分析支流入?yún)R彎曲干流河道水流水力特性，通過理論分析，在下游凹岸側(cè)采用布置丁壩群為護(hù)岸工程。 其次，通過物理模型試驗，運用Flow Tracker對測量點進(jìn)行數(shù)據(jù)采集，整理數(shù)據(jù)，通過數(shù)據(jù)處理著重分析了壩長及間距對支流入?yún)R彎曲干流河道水流的影響。 最后，通過方案對比，分析了丁壩群幾何參數(shù)對入?yún)R河道下游水流水力特性的影響，為丁壩群在支流斜交彎曲干流河道的護(hù)岸工程提供了重要的參考依據(jù)。
[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.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV863

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