In this paper, some characteristics of flow movement and sediment transport are analyzed by using the flume experiment data. the cross section of compound channel can be divided into four regions : the undisturbed region in main channel, the interactive region between channel and plain, the undisturbed region in flood plain and the boundary region. in the undisturbed regions, the distribution of longitudinal velocity along the depth has the feature of lograithmic. whereas, in the interactive region, the longitudinal velocity does not obey the logarithmic distribution law, but it can expressed as a revised logarithmic function by using a wake function. on the basis of the kinematic equation the velocity distribution of transverse velocity is obtained. in the boundary region, the longitudinal velocity obeys the law of parabolic distribution. furthermore, according to the simplified diffusion equation, the transverse distribution of sediment concentration in the interactive region is deduced. the analysis is in good agreement with the measured data
本文根據漫灘水流的運動特點,將漫灘水流的復式斷面分為主槽平衡區、灘槽交互區、灘地平衡區及邊壁區等4個區,並給出了各區寬度的經驗公式.根據灘槽交互區
垂線流速分佈的變化特點,提出了附加
尾流函數的對數流速分佈公式.在簡化水流運動方程和泥沙擴散方程的基礎上,對灘槽交互區內
垂線平均流速及含沙量沿橫向分佈進行了理論分析,提出了反映灘槽水流動量交換強度的橫向渦量粘性系數及橫向擴散系數的表達式,得到了漫灘水流
垂線平均流速及含沙量沿橫向分佈的解析解,並與實測資料吻合較好
The vertical tail size is not set to avoid spiral instability because this mode is not critical.
垂尾的大小不是根據避免螺旋不穩定來確定的。因為這種運動模態不是設計狀態。
Bending his foaming nose to his chest, arching his tail, and seeming to skim through the air without touching the earth, bedouin, as though he, too, were conscious of the tsars eye upon him, flew by in superb style, with a graceful high action of his legs
貝杜英把那吐出白沫的馬嘴低
垂到胸前,翹起
尾巴,彷彿腳不沾地地騰空飛奔似的,動作很優美,它高高地抬起四腳,變換步法,好像它也覺察到國王向它投射的目光,它於是威風凜凜地走過去了。
Study on the regular pattern of vertical distribution of freezing injury on the tree canopy of owari satsuma
尾張溫州蜜柑樹冠凍害的
垂直分佈規律研究
Tail : bushy, reaching at least to the hocks ; hanging straight down when at rest ; carried level with back or slightly above when moving
尾巴:毛發濃密,至少抵達跗關節處。休息時
尾部下
垂,走動時
尾部向上與背部持平或者略高於背部。
They were about the size of a pony and where very beautiful with their long, flowing manes and tails
他們和小型馬差不多大,有長長的、飄
垂的鬃毛和
尾巴。
At the end of the week, blaine attempted, but failed, to break the world ` s nine - minute underwater breath - holding record
在這周的
尾聲,他也試圖打破水中憋氣九分鐘的世界紀錄,但功敗
垂成。
The long and broad caudal fins are curved downwards slightly. it moves gracefully like a phoenix displaying its ornate plumage
尾鰭寬長,微
垂向下,泳姿優雅有如鳳凰展翅,故名蛋鳳或丹鳳。
The wind - tunnel investigation of the characteristics and mechanism of twin - vertical tail buffet of leading - edge extension configuration
邊條翼布局雙
垂尾抖振特性與機理風洞實驗研究
Optimal design of vertical tail using genetic - neural network algorithms
神經網路演算法優化飛機垂尾