scholarly journals Study on water environmental dispatch scheme for complex river network in Pearl River Estuary

2018 ◽  
Vol 246 ◽  
pp. 02031 ◽  
Author(s):  
Hua Wang ◽  
Wei Xu ◽  
Xiaoming Wu
Keyword(s):  
Water Quality ◽  
Water Exchange ◽  
Spring Tide ◽  
Water Environment ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Exchange Capacity ◽  
River Network ◽  
Pearl River ◽  
Evaluation Indexes

In order to promote the construction of Guangdong-Hong Kong-Macao Greater Bay Area, we should take into account the improvement of regional water environment while developing economy in Pearl River Estuary area. The water environmental dispatch scheme of river network is an important part of water environment improvement, and the key technology of dispatch is to determine the appropriate dispatch path, timing, scale and mode. The Hengqin Central River is taken as the study area in the paper. Based on the analysis of the characteristics of Hengqin Central River, the characteristics of nearby tides and water environment, this paper determines the dispatching path of “diversion from the east to the west”, the time of diversion during flood tide and drainage during ebb tide, the dispatching mode of sluice control, the dispatching scale of more water exchange during spring tide and less water exchange during neap tides, and puts forward the landscape dispatching scheme and the dilution dispatching scheme. In this paper, the semiexchange period and the rate of water exchange are taken as the evaluation indexes, and the dispatching effects of different schemes are analyzed by simulating different control schemes through water quality and quantity models. The results show that the water exchange capacity of Hengqin Central River network will be greatly enhanced when the diversion and drainage amplitude increases. The research results provide reference for water quality protection and control in the Pearl River Estuary complex river network.

scholarly journals Development of a GIS for managing dynamic, 3D coastal information of Pearl River Estuary

2007 ◽  
Vol 9 (3) ◽  
pp. 215-232 ◽  
Author(s):  
S. M. Y. Ng ◽  
O. W. H. Wai ◽  
Y. S. Li ◽  
Z. H. Xu ◽  
H. L. Chen ◽  
...  
Keyword(s):  
Water Quality ◽  
Three Dimensional ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Quality Data ◽  
Pearl River ◽  
Water Quality Data ◽  
Efficient Retrieval ◽  
Marine Data ◽  
Rigorous Model

A geographic information system (GIS) was developed for retrieval and display of hydrodynamic and water quality data. To establish such a system, two of the most important challenges are: (1) to establish a rigorous model which captures the three-dimensional and continuously changing characteristics of marine data and (2) to develop interpolation techniques to accommodate for the temporally and spatially scattered distribution of collected data. The developed system not only bridges together a GIS and a database of various physical, chemical and biological geographically based data for efficient retrieval and management of information, but also incorporates advanced display tools designed specifically for marine data. The initial intention of extending GIS for marine application is to mitigate the deteriorating water quality situation in the Pearl River Estuary (PRE).

Preliminary evaluation of ecological risk for the city area from the Pearl River Estuary

2014 ◽  
Vol 70 (10) ◽  
pp. 1648-1655 ◽  
Author(s):  
Qiuying Chen ◽  
KinChung Ho ◽  
Jingling Liu
Keyword(s):  
Relative Risk ◽  
Ecological Risk ◽  
Water Environment ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Risk Scores ◽  
Pearl River ◽  
Total Risk ◽  
The Pearl River Estuary ◽  
The Pearl River

It is essential to evaluate the ecological risk for the estuary cities area for the environmental restoration of the estuary. The ecological risk of six city areas from the Pearl River Estuary were evaluated by using the relative risk model. The relative risk assessment method was developed by considering the river network density in the sub-region. The results indicated that Dongguan had the largest ecological risk pressure with total risk scores as high as 10,846.3, and Hong Kong had the lowest ecological risk pressure with total risk scores up to 4,104.6. The greatest source was domestic sewage with total risk scores as high as 1,798.6, followed by urbanization and industry. Oxygen-consuming organic pollutants, organic toxic pollutants and nutrients were the major stressors of the water environment. In terms of habitats, the water environment was enduring the greatest pressure. For the endpoints, water deterioration faced the largest risk pressure.

Spatial assessment of water quality using chemometrics in the Pearl River Estuary, China

2017 ◽  
Vol 11 (1) ◽  
pp. 114-126 ◽  
Author(s):  
Meilin Wu ◽  
Youshao Wang ◽  
Junde Dong ◽  
Fulin Sun ◽  
Yutu Wang ◽  
...  
Keyword(s):  
Water Quality ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
Spatial Assessment ◽  
The Pearl River Estuary ◽  
The Pearl River

scholarly journals Effects of Wave–Current Interaction on Storm Surge in the Pearl River Estuary: A Case Study of Super Typhoon Mangkhut

2021 ◽  
Vol 8 ◽  
Author(s):  
Zhifa Luo ◽  
Bensheng Huang ◽  
Xiaohong Chen ◽  
Chao Tan ◽  
Jing Qiu ◽  
...  
Keyword(s):  
Storm Surge ◽  
Current Model ◽  
Spring Tide ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
Wave Setup ◽  
The Pearl River Estuary ◽  
Super Typhoon ◽  
The Pearl River

This study explored the effects of interactions between waves and current on storm surge in the Pearl River Estuary (PRE) using a fully coupled wave–current model. The model was validated based on in situ observations during the traverse of super typhoon Mangkhut. The results indicated that the model could reproduce the storm surge and wave setup processes. Numerical experiments showed that simulations of storm surge are minimally affected by wave setup. The wave setup during super typhoon Mangkhut reached up to 0.23 m and contributed to the total near shore storm surge by up to 8%. The simulations of the coupled model showed a better correlation with observations compared to those of an uncoupled model. The storm surge increased with transport upstream in a tidal-dominated outlet, whereas it decreased in a river-dominated outlet. The storm surge and wave setup increased and decreased, respectively, during spring tide as compared to that during a neap tide. The storm surge increased with increasing runoff in the upper river reaches, whereas there was little change in the tidal-dominated lower river reaches. This research emphasizes the importance of integrating the effects of multiple dynamic factors in the forecasting of storm surge and provides a reference for similar studies in other estuaries with multiple outlets and a complex river network.

Distribution Characteristics and Environmental Impacts of Nutrients in the Dry Season of the Pearl River Estuary in 2016

2020 ◽  
Author(s):  
Danna Zeng ◽  
Lixia Niu ◽  
Qingshu Yang
Keyword(s):  
Chlorophyll A ◽  
River Discharge ◽  
Spring Tide ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Dry Season ◽  
Pearl River ◽  
The Pearl River Estuary ◽  
Significant Difference ◽  
The Pearl River

<p>Based on the field efforts in 2016 during a dry season (30 Nov-6 Dec) in the Pearl River Estuary (PRE)，south China, this study aimed to investigate the tidal changes of phytoplankton variability (in terms of chlorophyll a) and their responses to multiple environmental factors.Time series analysis，principal component analysis (PCA)，Pearson correlation analysis, and Delft3D model were carried out. A significant difference was found in the tidal variations of dissolved nutrients, covering both a spring tide and neap tide . Moderate differences in salinity and suspended sediment played different roles in the nitrogen and phosphate. The negative correlations of salinity and nitrogen ecologically implied a stronger diluting-mixing effect than that of phosphate, which has a large impact on the water quality. The adsorption of phosphorus by sediment particles was stronger than that of nitrogen. Nitrogen was mainly contributed by river discharge. DIN was constrained by tide-river dynamics and their mutual increase-decline trend, and a new source was supplemented along the transport from river to sea. The weak correlation between PO<sub>4</sub> and salinity suggested a different source contribution of the terrestrial emission from coastal cities; the contribution of river discharge was less compared with nitrogen. Over site, P-limitation was detected and was more frequently resulted in eutrophication and even bloom events. Characterizing the relationships among chlorophyll a, nutrients, and hydrological factors enables us to develop effective ecosystem management strategies, and to design studies more focused on ecological health and function.</p>

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