Journal of East China Normal University(Natural Science) >
Analysis of the characteristics of the Qingcaosha Reservoir direct saltwater intrusion from the open sea in the Changjiang Estuary
Received date: 2020-03-26
Online published: 2021-04-01
Qingcaosha Reservoir is the main water source for Shanghai, providing approximately 55% of its high-quality raw water needs, and effectively guarantees the safety of water supply for Shanghai. The waters near the Qingcaosha Reservoir experience saltwater spillover from the North Branch into the South Branch; the nearby waters, moreover, suffer from direct saltwater intrusion from the open sea. In this study, a large number of measured salinity data in the upstream and downstream sluice was used to statistically analyze the characteristics of direct saltwater intrusion near the Qingcaosha Reservoir waters in recent decades. The analysis results show that direct saltwater intrusion neat the Qingcaosha Reservoir waters in recent decades was closely related to the river discharge, tide, and wind. There were a total of 16 instances of direct saltwater intrusion at the upstream sluice that occurred from September to March of the following year; likewise, there were a total of 41 instances of direct saltwater intrusion at the downstream sluice that occurred from September to May of the following year. The direct saltwater intrusions at the upstream and downstream sluices appeared primarily in December, January, and February of each year. We found that saltwater intrusions occurred most commonly when the river discharge was less than 18 000 m3/s during neap tide and middle tide (after neap tide) accompanied by persistent northerly or northwesterly winds. We found that the strength and duration of the northerly or northwesterly winds in the days preceding saltwater intrusion had an important role on direct saltwater intrusion.
Yiping ZHU . Analysis of the characteristics of the Qingcaosha Reservoir direct saltwater intrusion from the open sea in the Changjiang Estuary[J]. Journal of East China Normal University(Natural Science), 2021 , 2021(2) : 21 -29 . DOI: 10.3969/j.issn.1000-5641.2021.02.003
1 | 沈焕庭, 茅志昌, 朱建荣. 长江河口盐水入侵 [M]. 北京: 海洋出版社, 2003. |
2 | 华东师范大学河口海岸学国家重点实验室. 2014年2月长江口盐水入侵动力成因 [R]. 上海: 华东师范大学, 2015. |
3 | 王绍祥, 朱建荣. 不同潮型和风况下青草沙水库取水口盐水入侵来源. 华东师范大学学报(自然科学版), 2015, (4): 65- 76. |
4 | 李国平, 朱建荣. 2015—2017年长江河口青草沙水库盐水入侵分析. 华东师范大学学报(自然科学版), 2018, (2): 160- 169. |
5 | 顾玉亮, 申一尘, 乐勤, 等. 长江河口盐水入侵监测与预警技术. 给水排水, 2008, 34 (6): 106- 110. |
6 | QIU C, ZHU J R. Influence of seasonal runoff regulation by the Three Gorges Reservoir on saltwater intrusion in the Changjiang River Estuary. Continental Shelf Research, 2013, 71, 16- 26. |
7 | QIU C, ZHU J R, GU Y L. Impact of seasonal tide variation on saltwater intrusion in the Changjiang River Estuary. Chinese Journal of Oceanology and Limnology, 2012, 30 (2): 342- 351. |
8 | LI L, ZHU J R, WU H. Impacts of wind stress on saltwater intrusion in the Yangtze Estuary. Science China Earth Sciences, 2012, 55 (7): 1178- 1192. |
/
〈 |
|
〉 |