For the low water head water control project at a branching channel , its flood discharge capacity is related not only with the total discharge width but also with the discharge width ratio of the two branches 摘要位于分汊河段的低水头枢纽，其泄洪能力不仅与枢纽的总泄流宽度有关，而且与两汊泄流宽度之比有关。
Abstract : using a series of model tests , the properties of discharge capacity in the closed conduit due to inflow in gate shaft is studied and a method for estimating reducing discharge capacity is provided to designers 文摘:通过系统模型试验，研究了泄水道因进口闸门井进水减小泄流能力的特性，并提出了估算方法，可供设计应用。
For reservoirs on different rivers , the water - sediment condition , bed condition , reservoir operation mode and discharge construction are different , the producing , movement and discharging sediment characteristics of density current are also different 对不同河流上的水库，由于水沙条件、河床条件、水库运用方式及泄流建筑物的差异，异重流产生、运动和排沙特点也不同。
So the labyrinth weir is particularly suited for use where the discharge structure need to enlarge the ability of outflow but the width is restricted the labyrinth weir could be divided into straight - labyrinth weir and curve - labyrinth weir in this paper 因此，迷宫堰特别适用于泄水宽度受限，但又需提高泄流能力的泄水建筑物中。本文将迷宫堰分为直线型迷宫堰和曲线型迷宫堰。
The researches including discharge capacity , pressare properties , cavitation characteristics at some key positions , hoisting load of the gate , configuration of energy dissipator at the exit dentated - sill , and downstream scouring were performed by hydraulic model tests 借助系列水工模型试验对水布垭放空洞的泄流能力、压力特性及关键部位的空化特性、闸门启闭力、出口鼻坎消能工体型及下游冲刷等进行了较深入的研究、分析。
Analyses show that , when the ratio of the two branches ' discharge widths is coordinated with the resistance ratio of the two branches , the project reach has the least resistance , that the discharge capacity is the largest and that its influence on the project reach is less after the finishing of the project 通过分析，当两汊泄流宽度之比与汊道两汊阻力比相协调时，枢纽河段的阻力最小，其泄洪能力达最大，且枢纽建成后对枢纽河段的影响也较小。
( 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 根据以上计算所得的各断面平均流速，初步确定需要铺设的摘要护面类型计算在铺设护面以后坝首和坝末的冲坑深度，以验证护面材料是否可以抵抗洪水泄流的冲刷。
The projects on the downstream of river are increasing recently . the common features of these projects are low head , low frounde number , large discharge ect . the roller bucket with low - ridge is applicated on the project for energy dissipation in the condition of low fr current and low head 目前修建在河流中下游的水利枢纽工程日益增多，此类河流的泄洪消能有共同特点，即低水头、单宽流量大，考虑上游淹没、移民、河道两侧的交通等问题，不宜抬高河道水位，往往采用低堰泄流。
The result show that the position of free surface is higher because of frusta of brake , especial obvious in the head of frusta of brake ; flux coefficient and pressure on dam are quite influenced by type of frusta and 3 a type frusta of brake relative to 2 type frusta of brake has bigger flux coefficient and smaller pressure on dam ; obvious influence of ability of discharge flow for different ratio of thickness of frusta and breadth of brake and pressure on dam reduces with increasing ration of thickness of frusta and breadth of brake , while bigger flux coefficient is obtained when tlb = 0 . 2 结果表明，闸墩河海大学博士论文的存在抬高了水面线的位置，其中在闸墩头部尤其明显;墩型对流量系数和坝面压力影响较大， 3a型闸墩相对于2型闸墩具有更大的流量系数和更小的坝面压力:不同的墩厚闸宽比t / b对泄流能力也将产生显著的影响，随着墩厚闸宽比的增加，坝面压力降低，而当t / b二0 . 2时溢流坝具有更大的流量系数。
The construction scheme is briefly introduced herein , and furthermore , the diversion structures , the composite scheme consisting of open caisson group adopted to treat the overburden of the foundation for the stage 2 longitudinal concrete cofferdam and the diversion method of bottom outlet combined with the dam gap used for the stage 2 diversion are described as well 文中对该方案进行了简要介绍，并介绍了有关导流建筑物，以及二期纵向混凝土围堰堰基覆盖层采用了沉井群等综合处理方案和二期导流采用的底孔加缺口联合泄流方式。
