为此，必须尽快扩大高集海堤的过水断面，恢复西海域生态平衡。
For all of these, quick action should be taken to widen the water-crossing section of Gaoji seawall to renew back ecological balance.
影响汊道分流比的主要因素有：两汊的比降、过水断面积、糙率、流速等。
Main factors effecting on flow rate in braided river is gradient of anabranch, area of water, roughness and velocity.
影响汊道分流比的主要因素有：两汊的比降、过水断面积、糙率、流速等。
Main factors effecting on flow rate in braided river is gardient of anabranch, area of water, roughness and velocity.
鱼骨坝束窄了河道过水断面，引起坝体两侧水流流速的增大，坝田内流速则大幅度减小；
Alongside the dike, the flow velocity gets larger, and it is on the contrary in the dike field.
详细分析了影响截留泡过水断面的主要因素，提出了采用分段法设计断面的原理及方法。
Through analysing the main factors which affect the water-cut of the flood-cut-off ditch, it advances a new theory and method to design the cut by dividing the ditch into several parts.
马蹄形过水断面是无压输水隧洞中常采用的断面形式之一，因其几何形状复杂，水力计算困难。
It is difficult to calculate normal water depth of horseshoe cross section, because its complex geometrical shape.
普通城门洞形过水断面是泄洪隧洞和灌溉引水隧洞较常采用的断面形式之一，其水力计算中的正常水深求解无显函数形式的表达公式。
The arched section is one of the usually adoptive section shapes in flood discharge tunnels and irrigation tunnels, but the analytic expression of normal water depth for this section is not explicit.
梯形渠道的水力最优断面因为具有在过水断面面积一定时通过的流量最大的特点，是水利工程中一种常见的渠槽形式，它的断面设计需求解一个很复杂的高次方程。
Trapezoid channel is a common form in hydrological project with characteristic of maximum influx at a certain time, its section designing requires a complex equation of higher degree.
改斜坡式断面为直立式断面，缩小下游引航道的过水面积，不仅能减少淤积量，而且有利于提高冲沙效率。
The change of the slope section to vertical section and the reduction of wetted cross-section may not only decrease deposition but also improve sediment scouring efficiency.
针对水利工程上常用的城门洞形及马蹄形过水隧洞，利用临界流方程，给出了旨在用于临界流分析的断面参数Z和水力指数M 的计算公式和表示水深与Z以及M 之间的关系曲线。
Based on the basic critical flow equation, formulae, which used to determine section factor Z and hydraulic exponent M for critical flow in city gate and horseshoe conduits, were derived.
针对水利工程上常用的城门洞形及马蹄形过水隧洞，利用临界流方程，给出了旨在用于临界流分析的断面参数Z和水力指数M 的计算公式和表示水深与Z以及M 之间的关系曲线。
Based on the basic critical flow equation, formulae, which used to determine section factor Z and hydraulic exponent M for critical flow in city gate and horseshoe conduits, were derived.
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