| 黄河“揭河底”冲刷期河道形态调整规律 |
| |
| 引用本文： | 江恩慧,曹永涛,张清,李军华,袁敏洁,刘月兰.黄河“揭河底”冲刷期河道形态调整规律[J].水科学进展,2015,26(4):509-516. |
| |
| 作者姓名： | 江恩慧 曹永涛 张清 李军华 袁敏洁 刘月兰 |
| |
| 作者单位： | 黄河水利科学研究院水利部黄河泥沙重点实验室, 河南郑州 450003 |
| |
| 基金项目： | 水利部公益性行业科研专项经费资助项目(201101009);国家自然科学基金资助项目(51209101) |
| |
| 摘 要： | 为准确预测和有效应对“揭河底”冲刷险情,通过大量挖掘相关水文站1950年以来的原始测验资料,结合概化模型试验,对“揭河底”冲刷期河道断面形态调整过程及洪水位变化情况进行了深入研究。结果表明,“揭河底”冲刷期河道形态调整具有明显的规律性。从过程看,一般可分为4个阶段,即“揭河底”前的一般冲刷阶段、河底高程基本不变阶段、胶泥块揭起河床快速下降阶段和“揭河底”后期持续冲刷阶段及回淤阶段。“揭河底”洪水与非“揭河底”洪水在水位表现上差别较大,非“揭河底”洪水水位流量关系曲线较为平缓,洪水前后水位变化过程呈明显的逆时针绳套;“揭河底”洪水水位流量关系曲线较为陡峭,水位变化过程呈明显的顺时针绳套,“揭河底”发生的瞬时,水位有一个明显的升高和快速下降过程。从流态看,水面紊动剧烈的地方位于发生“揭河底”位置的下游,这也是本次研究的一个重大发现。
|
| 关 键 词： | “揭河底”冲刷 断面形态 洪水位 流态 黄河 |
| 收稿时间： | 2014-11-05 |
Pattern of channel adjustment due to bottom-block scour on the Yellow River |
| |
| JIANG Enhui,CAO Yongtao,ZHANG Qing,LI Junhua,YUAN Minjie,LIU Yuelan.Pattern of channel adjustment due to bottom-block scour on the Yellow River[J].Advances in Water Science,2015,26(4):509-516. |
| |
| Authors: | JIANG Enhui CAO Yongtao ZHANG Qing LI Junhua YUAN Minjie LIU Yuelan |
| |
| Affiliation: | MWR Key Laboratory of Yellow River Sediment, Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China |
| |
| Abstract: | The paper is intended to show the patterns of the changes both in the cross section and the local flow due to a peculiar kind of scour, bottom-block scour, or named as bottom tearing scour and bottom ripping up, which is often found to occur in the forms of bottom-block uplifting and moving on the Yellow River, instead of commonly seen sediment particles' transport. Based on the data measured at the Longmen and Tongguan hydrometric stations and the lab experiments by the authors, the bottom-block scour is found to follow a four-staged pattern: Starting from pre-scour, to channel bed elevation keeping relatively stable, bed rapid declining due to mud-layered block uplift, and continual scour followed by back-silting. The bottom-block scour is found to tend to make a steeper and clockwise rating curve loop while non-bottom-block scour tends to make a mild-sloped and anticlockwise one. When the bottom-block scour starts, the local water level begins with a sudden rising and is followed by a rapid fall. Intensively turbulent flow is found not at the place where the bottom-block scour happens, but downstream of it. The paper is of significance in predicting and handling the risk of river training works failure due to the bottom-block scour. |
| |
| Keywords: | bottom-block scour cross section flood level flow state Yellow River |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《水科学进展》浏览原始摘要信息 |
|
点击此处可从《水科学进展》下载全文 |
|
