| 姚文艺,常温花,夏修杰.黄河下游游荡性河段清水下泄期河道断面形态的调整过程[J].水利学报,2003,34(10):0075-0080 |
| 黄河下游游荡性河段清水下泄期河道断面形态的调整过程 |
| Regulation process of river section morphology in the wandering reach of Lower Yellow River due to erosion of clear water discharging from upstream |
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| DOI： |
| 中文关键词: 清水冲刷 游荡性河段 水库下游 河床过程 黄河 |
| 英文关键词: erosion of clear water wandering reaches regulation process cross morphology data analysis model test |
| 基金项目: |
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| 摘要点击次数: 2087 |
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| 中文摘要: |
| 为预测小浪底水库运用后下游河道断面形态调整趋势，以1960～1964年三门峡水库清水下泄期定位观测资料为基础，结合物理模型试验，研究了清水下泄过程中黄河下游游荡性典型河段河势变化趋势、河道横断面形态的调整过程及其模式。研究表明，若缺乏较完善的整治工程体系的约束，尽管在上游水库建成运用后的清水下泄初期，河势会趋于相对归顺，但冲刷后期将会出现明显的坐湾摆动现象，游荡性并不能改变；横断面调整过程的模式基本上为“下切+展宽—下切—下切+局部河段展宽”；为利于河槽形成窄深断面，上游水库下泄流量不宜过小且历时不能过长，同时，流量变幅不宜过大。 |
| 英文摘要: |
| In order to forecast the change of lower reaches of Yellow River after the Xiaolangdi reservoir was put into operation, the variation tendency of river regime, regulation process of cross section morphology and its variation mode in typical wandering reaches are studied by means of data analysis and physical model test. It is found that if no restraint formed by perfect system of training works the river regime trend to regular at first due to clear water charged from Xiaolangdi reservoir, but afterward it changes to be wandering as the erosion is continued. The regulation process of the river cross sections is in “cutting down+widening—cutting down—cutting down+widening of local river section” mode. For enhancing the formation of a deep and narrow cross section, the amount of discharge from the Xiaolangdi reservoir must be large enough and the discharge duration should not be long. At the same time the variation of discharge should be controlled in a suitable range. |
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