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桩墩影响的一维和二维水动力数值研究
| 论文题名： | 桩墩影响的一维和二维水动力数值研究 |
| 关键词： | 桩墩;水动力学;数学模拟;港口工程 |
| 摘要： | In order to analyse the backwater caused by the bridges, 1D model (HEC-RAS) and 2D model (RMA2) of Shu River were set up. The water level profile along the river and in the cross-sections, the distribution of the velocity and the flow field were analysed. At the same time, the difference of two models was compared.Firstly, when 2D model is used, it can be concluded as follows: (1) The water level increases in the upstream of the bridge. The obvious backwater's range is from 2500m to 4800m. But the water level decreases in the downstream of the bridge. The varied range is 500m. (2) The water level profile in the cross-section is smooth before construction.Whether the old bridge or the new bridge is built, the water level profile in the cross-section is no more smooth in the upstream of the bridge. But if the distance of the cross-section is far more than 50m from the bridge, the water level profile in the cross-section becomes smooth again. (3) The velocity will decrease in the front of the piers and will increase between the piers. With the distance of the cross-section becoming farther, the change of the velocity in the cross-section will diminish. (4)The flow fields in four conditions are similar. There is only a little different of the flow field around the bridge. Secondly, when 1D model is used, it can be concluded as follows: (1) The water level affected by the bridge increases in the upstream of the bridge. And it doesn't change in the downstream of the bridge. The obvious backwater's range is from 2500m to 4800m. (2) The velocity will decrease in the front of the piers and will increase between the piers. With the distance of the cross-section becoming farther, the change of the velocity in the cross-section will diminish.At last, by comparison of the 1D model with the 2D model, the following conclusions can be achieved: (1) The difference of the water level simulated by HEC is similar to that computed by RMA2. So two models are both fit to be used to predict the variation of the water level in the upstream of the bridge. (2) The distributing of the velocity in the 1m cross-section is similar in four conditions.Keywords: Bridge piers, backwater, velocity, sub-critical flow, numerical model |
| 作者： | 吴过 |
| 专业： | 港口、海岸及近海工程 |
| 导师： | 张玮 |
| 授予学位： | 硕士 |
| 授予学位单位： | 河海大学 |
| 学位年度： | 2007 |
| 正文语种： | 中文 |
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