【摘要】：階梯形丁壩在航道整治中應用廣泛,其回流規(guī)律與船舶通航、壩田淤積及堤岸穩(wěn)定等系列問題密切相關,但目前研究很少。應用三維水流數(shù)學模型研究雙級階梯形丁壩幾何尺度及來流條件對回流規(guī)律的影響,結果表明:(1)回流長度隨一級丁壩相對長度ε_1及高度ψ_1、二級丁壩相對長度ε_2均呈遞增變化趨勢,隨弗勞德數(shù)Fr呈先增大后減小的變化趨勢;(2)回流寬度隨ε_1,ε_2和ψ_1變化相對明顯,而隨Fr變化總體較小;(3)回流正、負流區(qū)寬度比沿程變化曲線總體為上凸狀,負流區(qū)寬度相對較大,在靠近丁壩部位可達正流區(qū)寬度的2.5倍;(4)回流曲線形態(tài)與ε_1,ε_2和ψ_1有關,ε_1和ψ_1主要影響回流曲線長度,ε_2影響回流曲線的整體形態(tài);(5)回流流量一般小于來流量的10%,沿程分布曲線不對稱,增流區(qū)回流流量變化相對緩慢,而減流區(qū)變化相對劇烈。
[Abstract]:Stepped spur dike is widely used in waterway regulation, and its backflow law is closely related to a series of problems, such as navigation of ships, siltation of dam field and stability of dike bank, etc., but there is little research at present. In this paper, the effect of geometric scale and flow conditions of two-stage stepped spur dike on the reflux law is studied by using the three-dimensional flow mathematical model. The results showed that: (1) the reflux length increased with the relative length 蔚 1 and the height 蠄 1, the relative length 蔚 2 of the secondary groin increased gradually, and then decreased with Froude number Fr; (2) the circumfluence width changed relatively obviously with 蔚 1, 蔚 2 and 蠄 Snap1. (3) the width of the negative flow zone is higher than that of the negative flow zone, and the width of the negative flow zone is relatively large, and the variation curve of the width of the negative flow region is generally convex. (4) the shape of the backflow curve is related to 蔚 _ s _ 1, 蔚 _ s _ 2 and 蠄 _ 1, 蔚 _ s _ 1 and 蠄 _ 1 mainly affect the length of the reflux curve, 蔚 _ 2 affects the whole shape of the return _ flow curve; (5) the return flow rate is generally less than that of the coming flow rate, along the length of the return curve. The range distribution curve is asymmetrical, The flow rate of reflux in the increasing area is relatively slow, while that in the reducing zone is relatively sharp.
【作者單位】： 重慶交通大學國家內河航道整治工程技術研究中心;重慶交通大學水利水運工程教育部重點實驗室;重慶市信息通信咨詢設計院有限公司;
【基金】：重慶市基礎與前沿研究計劃項目(cstc2017jcy AX0278) 國家自然科學基金資助項目(51509026)
【分類號】：U617.91

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