| 曹文洪.黄河下游水沙复杂变化与河床调整的关系[J].水利学报,2004,35(11):0001-0006 |
| 黄河下游水沙复杂变化与河床调整的关系 |
| Relationship between variation of sediment carrying flows and readjustment of riverbed in the lower reaches of Yellow River |
| 投稿时间：2004-07-02 |
| DOI： |
| 中文关键词: 水沙变化 河床调整 水库调节 黄河下游 河势 |
| 英文关键词: variation of sediment carrying flows channel adjustment reservoir control lower reaches of Yellow River river regime |
| 基金项目:国家自然科学基金(50239040) |
|
| 摘要点击次数: 2219 |
| 全文下载次数: 183 |
| 中文摘要: |
| 冲积河流具有自动调整的功能，针对不同的来水来沙和边界条件，河流会作出相应的调整。1986年以来黄河下游水沙呈现有效造床洪水峰值减小且出现频率下降，枯水历时大幅度增加和小流量对河道的造床作用加强等特点。本文通过分析黄河水沙变化特性，探讨了河床沉积与形态调整的变化。研究表明，黄河下游河道的冲淤特性与不同时期年均来沙系数具有较好的相关关系，当年均来沙系数小于0.015时，下游河道处于不淤的临界状态。通过小浪底水库调控水沙过程，保证一定规模的造床流量，对于塑造黄河下游合理的滩槽结构是非常重要的。 |
| 英文摘要: |
| Alluvial river possesses the capability of self-adjustment conforming the variation of runoff, sediment and river boundary conditions. Remarkable changes occur to the lower reaches of Yellow River since 1986, such as the reduction of flood peaks and reduction of occurrence frequency of effective floods. Since then the River is under the long-term action of small discharge. In this paper, the characteristics of the flow-sediment variation and the corresponding adjustment of riverbed shape are studied based on the observation data. It is found that the silting or erosion of the river is closely related to the annual average incoming sediment coefficient (ratio of sediment concentration to river discharge). When the annual average incoming sediment coefficient is less than 0.015, the river reaches the critical state in which deposition will not take place. So that it is very important to provide a certain incoming discharge for forming the reasonable shape of river channel by means of the optimized operation of Xiaolangdi Project. The configuration of riverbed must consist of main channel and flood plain. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |