| 钱塘江河口水流-河床相互作用及对盐水入侵的影响 |
| |
| 引用本文： | 潘存鸿,张舒羽,唐子文.钱塘江河口水流-河床相互作用及对盐水入侵的影响[J].水科学进展,2015,26(4):535-542. |
| |
| 作者姓名： | 潘存鸿 张舒羽 唐子文 |
| |
| 作者单位： | 1.浙江省水利河口研究院, 浙江杭州 310020; |
| |
| 基金项目： | 国家自然科学基金资助项目(51379190);浙江省重点科技创新团队资助项目(2010R50035) |
| |
| 摘 要： | 通过长系列实测水文、地形资料分析,钱塘江河口上段河床具有大冲大淤和洪冲潮淤的演变特性,影响河口上段的潮汐强弱,进而影响盐水入侵。若年内丰水期径流量大,则河床出现“大冲”,河床容积增大,潮汐增强,导致秋季强潮期盐水入侵加剧;反之,若年内丰水期径流量小,河床容积较小,导致秋季强潮期盐水入侵减弱。结果表明,钱塘江径流对盐水入侵存在直接和间接影响:直接影响是盐水入侵与径流量成反比;间接影响是通过径流冲刷河床,引起潮汐增大,间接导致盐水入侵加剧,这是钱塘江河口大冲大淤以及对潮汐巨大反作用的特性造成的。
|
| 关 键 词： | 钱塘江河口 河床冲淤 盐水入侵 水流-河床相互作用 |
| 收稿时间： | 2014-08-26 |
Interaction of flow-riverbed and its effects on saltwater intrusion in Qiantang River estuary |
| |
| PAN Cunhong,ZHANG Shuyu,TANG Ziwen.Interaction of flow-riverbed and its effects on saltwater intrusion in Qiantang River estuary[J].Advances in Water Science,2015,26(4):535-542. |
| |
| Authors: | PAN Cunhong ZHANG Shuyu TANG Ziwen |
| |
| Institution: | 1.Zhejiang Institute of Hydraulics and Estuary, Hangzhou 310020, China;2.Zhejiang Institute of Marine Planning and Design, Hangzhou 310020, China |
| |
| Abstract: | Based on the long term hydrological and bathymetric analysis, the morphological evolution in the estuary features the significantly large riverbed change, that is, the great erosion in runoff-dominated periods and the great sedimentation in tide-dominated period in the upper reach of the Qiangtang River estuary. This morphdynamic characteristics results in the large variation of tide in the upstream section and therefore affects saltwater intrusion. With plentiful runoff during wet seasons, the riverbed suffers great erosion, leading to the increase of river convey volume and enhancement of tide. This results in the increase of saltwater intrusion in falls with strong tide. On the contrary, with small runoff during wet seasons, the river convey volume is small. Therefore, it results in weakening saltwater intrusion in falls. The results indicated that the runoff variation has direct and indirect impacts on saltwater intrusion in the Qiantang River estuary. The direct impacts are the common characteristics of tidal estuary, i.e. saltwater intrusion increases as runoff decreases. The indirect impact is that the large erosion caused by the large runoff results in the increase of tide, and therefore indirectly leading to intensified saltwater intrusion. This feature results from the characteristics of the large riverbed change and its great response of tide strength in the Qiantang River estuary. |
| |
| Keywords: | Qiantang River estuary riverbed erosion and deposition saltwater intrusion interaction of flow-riverbed |
| 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》下载免费的PDF全文 |
|
