The Temporal and Spatial Evolution of Saltwater Intrusion during Dry Season in the Yangtze River Estuary, China

2014 ◽  
Vol 1010-1012 ◽  
pp. 1099-1103
Author(s):  
Wei Na Zhang ◽  
Yi Gang Wang ◽  
Tong Jun Yang ◽  
Hui Ming Huang
Keyword(s):  
Saltwater Intrusion ◽  
Yangtze River ◽  
River Estuary ◽  
Dry Season ◽  
Yangtze River Estuary ◽  
The Yangtze River ◽  
The South ◽  
The North ◽  
The Yangtze River Estuary ◽  
Temporal And Spatial

Abstract. The saltwater intrusion in the Yangtze River Estuary is very frequent and complicated with a great effect on freshwater supply in Shanghai and nearby cities. By using the hydrologic data observed in dry season, the temporal and spatial variation of the saltwater intrusion in the Yangtze River Estuary were analyzed. The results show that the saltwater intrusion of the south branch is mainly induced by the saltwater spilling over from the north branch, which causes the Chenhang reservoir being plagued by saltwater intrusion during dry season. As the saltwater group from the north branch moving downward along the south branch, the longitudinal salinity distribution present a high-low-high shape during spring tide cycle, low-high-low-high shape during medium tide cycle and low-high shape during neap tide cycle along the south branch-south channel-south passage. Moreover, the north branch is controlled by high saline water with the increase of the salinity in the upstream reach in medium and spring tides, but this phenomenon is vanished in neap tide. In addition, the vertical distribution of salinity is more homogeneous in shoals than that in deep channels, which is induced by mixing degree in water column.

Morphodynamic Simulation at the South Branch of Yangtze Estuary

2009 ◽  
Author(s):  
Xiaoyan Zhou ◽  
Ulrich Zanke ◽  
Yixin Yan ◽  
Jinhai Zheng
Keyword(s):  
Yangtze River ◽  
Morphological Changes ◽  
River Estuary ◽  
Wave Model ◽  
Yangtze Estuary ◽  
Yangtze River Estuary ◽  
The Yangtze River ◽  
The South ◽  
Morphological Response ◽  
The Yangtze River Estuary

In this paper a numerical morphodynamic model TIMOR3 has been introduced and applied to simulate the morphological response to the water and sediment changes in the Yangtze River Estuary. TIMOR3, coupled with Hydrodynamic Model and Wave Model, is used to simulate a long-term and huge area of the morphological changes in the Yangtze River Estuary. A detailed investigation was made to the south branch where the Deepwater Channel Navigation Project is under construction. The effect of the project in different phases with different water depth has been simulated and analyzed.

The Temporal and Spatial Variation of the Nutrientsin the Yangtze River Estuary

2014 ◽  
Vol 1010-1012 ◽  
pp. 399-402
Author(s):  
Hao Liu ◽  
Wen Shan Xu ◽  
Hong Xuan Kang ◽  
Bao Shu Yin
Keyword(s):  
Spatial Variation ◽  
Yangtze River ◽  
River Estuary ◽  
Bottom Layer ◽  
Yangtze River Estuary ◽  
The Yangtze River ◽  
Temporal And Spatial Variation ◽  
The Yangtze River Estuary ◽  
Temporal And Spatial ◽  
High Level

This paper mainly focuses on the temporal and spatial variation of nutrients in the Yangtze River Estuary. Observations show that the high level of nitrate concentration appears in the coast waters and gradually decreases toward the continental shelf both in summer and in winter; while the ammonium and phosphate concentrations show the relatively high level in the bottom layer of the water column in summer, since ammonium and phosphate can be regenerated on the sediments and reenter the bottom layer of the water column to make up their contents. In winter, the nutrients are well-distributed in the vertical due to the strong mixing mechanism. The further examination of the nutrient limitation, according to the Redfield theory, shows that the phosphorus limitation dominates in the river mouth and then shift to the nitrogen limitation toward the continental shelf gradually. The variation of the nutrient limitation may be dependent on the relative strength between the Changjiang Diluted Water and the Intrusion Branch of the Kuroshio Current.

scholarly journals Study on the Influence of Reservoir Dispatch of the Upper Yangtze River on the Runoff Control

2021 ◽  
Vol 283 ◽  
pp. 01030
Author(s):  
Tang Bing ◽  
Wang WenChao ◽  
Fan Xiaozhi
Keyword(s):  
Saltwater Intrusion ◽  
Yangtze River ◽  
River Estuary ◽  
Yangtze River Estuary ◽  
Water Quantity ◽  
The Yangtze River ◽  
Upper Yangtze River ◽  
The Yangtze River Estuary ◽  
Upstream Reservoir ◽  
The Upper Yangtze River

The reservoir group focusing on the Three Georges reservoir has been established in the upper Yangtze River, with a total regulation capacity of 51.5 billion m3. The reservoir group dispatch plays an important role in regulating the runoff. Economic activity in the Yangtze River estuary poses high requirements for water resources security. The water quality of main water supply reservoirs is influenced by the saltwater intrusion. The upstream reservoir group dispatch can enhance sea inlet runoff and mitigate saltwater intrusion hazard. In order to clarify the upstream reservoir group’s influence on the sea inlet water quantity in the Yangtze River estuary, the author designed three typical reservoir group dispatch scenarios to analyze flow rate change and different dispatch scenarios of Datong section. According to the findings, the upstream reservoir group dispatch is important to secure water quantity in the dry season. Through normal dispatch, the Three Georges reservoir can cut the days with a flow rate less than 100 million m3/s from 50.6 days to 8.8 days. In the special dry year, the sole emergency water supplement by the Yangtze River reservoir to the estuary will exert influence on the reservoir power generation. The joint operation of upstream reservoir group can basically eliminate such influence.

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