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首页> 外文期刊>Environmental engineering and management journal >WATER LEVEL VARIATION DUE TO BRIDGES OR OTHER RIVERS CONSTRICTION
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WATER LEVEL VARIATION DUE TO BRIDGES OR OTHER RIVERS CONSTRICTION

机译：由于桥梁或其他河流收缩，水位变化

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At the construction of a bridge in the riverbed, the water flow section is usually reduced due to the placement of the piles and abutments of the bridge between the banks. How the water flow change depend on the flow regime (fast-supercritical or slow-subcritical) existing in the river in the absence of the bridge. Of interest is the change of the water level in the section of the bridge and upstream of the bridge. The water level may rise or fall depending on the flow regime (slow or fast) and the size of the channel narrowing.Romanian hydraulic bridge calculation standard states that the water level upstream of the bridge increases under any conditions. Other technical prescriptions distinguish between different changes in water level at bridges depending on the flow regime existing on the river before the bridge is placed. The frequent situation in which the flow regime on the river is slow is of great interest because they are the most common. The calculation schemes that describe this situation have the premise that the water level upstream of the bridge increases. In most situations this is what happens but not in any situation. The article aims to identify situations where, in a slow flow regime, the water level upstream of a bridge does not increase but decreases, even if the presence of the bridge means the narrowing of the water flow section. This clarification is very important for the agencies that issue the bridge construction permits, for which the specifications in the regulations are important landmarks. The same situation can be encountered in the case of levees that obstruct the major riverbed. And in this case the water level may decrease or increase under the narrowing of the riverbed.
机译：在河床中的桥梁的结构中，由于桩和堤岸之间的桥梁的放置，通常会降低水流动部分。水流量改变如何取决于河桥的河流中存在的流动制度（快速超临界或慢临界）。兴趣是桥梁和桥梁上游的水位的变化。根据流动制度（慢速或快速）和通道狭窄的尺寸，水位可能会上升或下降。载体液压桥接计算标准指出桥上游的水位在任何条件下都会增加。根据在放置桥之前的河流上存在的流动制度，其他技术处方区分在桥梁的水位不同的变化。河流上流动制度慢的频繁情况极为困难，因为它们是最常见的。描述这种情况的计算方案具有桥上游的水位增加的前提。在大多数情况下，这就是发生的事情，但不是在任何情况下。该文章旨在识别在慢速流动状态下，在桥上游的水位不会增加但是即使桥的存在意味着水流动部分的缩小，也会降低。这一澄清对于发出桥梁建设许可的机构非常重要，规定规范是重要的地标。在阻碍主要河床的堤坝的情况下，可以遇到相同的情况。在这种情况下，水位可能在河床的缩小下减少或增加。

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