scour hole 中文意思是什麼
scour hole
解釋
沖蝕穴-
Choice of slit - type bucket parameters and estimation of scour hole depth
一級直線邊墻窄縫挑坎參數選擇與沖坑深度估計 -
The ratio of the length to the depth of scour hole decreases with the increasing scour depth, in spite of the reason is the increase of the air concentration, the decrease of the jet velocity or the decrease of the jet thickness. 5. governing equations of the aerated jet flow are established
摻氣對沖坑形態並沒有實質性的影響，沖坑的寬深比隨沖坑深度的減小而增大，無論造成沖坑深度減小的原因四） 1大學i學博士學位論文是摻氣、降低流速還是減小入射水舌厚度，其變化規律都可用相同的直線關系表示。 -
The relationship between the air concentration and the scour depth can be expressed as an exponential function. aeration does not affect the shape of scour hole
摻氣濃度c _對沖坑深度的影響，可表達為摻氣濃度與沖坑無量綱深度的冪函數關系。 -
( 5 ) according to the calculated average section velocity. we can decide the type of the revetment. ( 6 ) when the scour hole depth of the dam head and trail parts is calculated inthe paper. we can validate whether the revetment material is strong enough to resist the degradation of the flood flow
根據以上計算所得的各斷面平均流速，初步確定需要鋪設的摘要護面類型計算在鋪設護面以後壩首和壩末的沖坑深度，以驗證護面材料是否可以抵抗洪水泄流的沖刷。 -
Experiments about the influence of aeration on the dynamic pressure on the original riverbed show, aeration will obviously increase the fluctuating pressure on the original riverbed. 3. experiments about the influence of aeration on the dynamic pressure on the bottom of scour hole show, the influence of aeration on the dynamic pressure on the bottom of scour hole is ruleless
試驗研究了摻氣對沖坑底部脈動壓強的影響，結果表明：無論沖坑深度為多大，坑底脈動壓強均方根值沿程分佈與不摻氣時相比，沒有確定性的規律，射流摻氣后，沖坑底部的脈動壓強有時增加，有時反而減小。 -
Silt will deposit there. velocities around groin head are larger than the scour velocity and scour hole may develop in this area. this would affect the stability of spur dikes
受丁壩阻擋，壩田所在的邊灘區域流速很小，泥沙在此淤積:而壩頭附近流速較大，通常在此區域形成沖刷，影響丁壩的穩定性。 -
The existing results about scour hole was summarized. experiments was made about the influence of aeration on scour, the dynamic pressure on the original riverbed and the scouring hole bottom, and the influence of aeration on the dynamic pressure and the velocity of submerged jet. scour was simulated by numerical model
在總結前人研究成果的基礎上，試驗研究了摻氣對基巖沖刷破壞的影響；基巖沖刷過程中沖坑底部脈動壓強隨沖坑深度的增加而變化的特性；摻氣對沖坑未形成前河床底部及基巖沖刷坑底部脈動壓強的影響；摻氣對射流軸線流速變化的影響等。 -
4. experiments about the influence of aeration on scour hole show, aeration decrease the scour depth
證明了沖刷坑的形成對下游水流流態及坑底脈動壓強特性有較大的影響。 -
According to the similar rule, a movable bed model for downstream channel and the particle size distribution of the model silt in the channel and the scour hole are designed. a theoretical method of size distribution in the scour hole is devised
根據模型律設計了太平灣尾水渠動床模型，分別確定了河床中和沖刷坑中模型沙的配比，並對沖坑中的床質級配進行了理論推導。 -
The main contents and conclusions are as follows : 1. the dynamic pressure on the original riverbed and the scour hole are measured. the results show that the characteristics of dynamic pressure in the scour hole are the same as that on the original riverbed
表明在基巖沖刷過程中以及沖坑穩定后，射流沖擊區的脈動壓強與沖坑形成前一樣，都是以低頻大振幅為主，說明在沖刷坑形成后，射流沖擊區水流與無沖坑時一樣，都是大尺度渦不斷破碎和小尺度渦不斷生成的過程。 -
Abstract : an experimental investigation of local scour around a new type bridge pier under a clear water regime is presented. the main characteristic feature of flow is relatively large horseshoe vortex flow along the circumference of the pier. and the procession of scour is discussed in this paper. equation for predicting the depth and area of local scour hole is presented. it is significant for evaluating the potential for scour around this type pier
文摘:介紹了一種新型橋墩即多腹薄壁墩的局部沖刷試驗成果.認為橋墩周圍的水流以繞流橋墩的相對較強的馬蹄型漩渦系為主要特徵.並討論了沖刷過程，給出了預測沖坑深度及大小的關系式，可供估算同類型橋墩的沖刷參考
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