scholarly journals Flume Test Simulation and Study of Salt and Fresh Water Mixing Influenced by Tidal Reciprocating Flow

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 584
Author(s):  
Weiyi Xia ◽  
Xiaodong Zhao ◽  
Riming Zhao ◽  
Xinzhou Zhang
Keyword(s):  
Fresh Water ◽  
Control Variable ◽  
Vertical Gradient ◽  
Tidal Range ◽  
Basic Study ◽  
Interface Stability ◽  
Estuarine Dynamics ◽  
Water Mixing ◽  
Experiment Control ◽  
Reciprocating Flow

The salt-fresh water mixing is one of the basic topics of estuarine dynamics research. In partially mixed and highly stratified mixed estuaries, the structure of stratified flow is complicated by density gradient and tidal reciprocating flow. The velocity and salinity structures have been experimentally studied in a flume which is 167.8m long, 0.5m wide, and 0.5m deep. The processes of the tidal levels, the flood and ebb current, and the salt-fresh water mixing have been simulated. Furthermore, the partially mixed and highly stratified mixed types have been repeatability showed in the flume, by solving the problems of experiment control and saltwater recycling. The control variable method has been used to dialectically analyze the influence of tidal range and runoff volume on the velocity and salinity distribution. The tide and runoff are respectively considered to affect the mixing type in two contradictory ways. In the condition of tidal reciprocating flow, the periodical change of interface stability has been investigated. It is considered that the interface stability is closely related to the vertical gradient of density and velocity. As a result, the critical value of interface stabilization has been presented. The experimental data and research results can be used for the basic study of estuarine dynamics and applied to practical problems such as estuarine saltwater intrusion.

Trace metals behaviour during salt and fresh water mixing in the Venice Lagoon

1993 ◽  
Vol 75 (1-4) ◽  
pp. 330-333 ◽  
Author(s):  
G. Ghermandi ◽  
D. Campolieti ◽  
R. Cecchi ◽  
F. Costa ◽  
L. Zaggia ◽  
...  
Keyword(s):  
Trace Metals ◽  
Fresh Water ◽  
Venice Lagoon ◽  
Water Mixing

Biased Monitoring of Fresh Water-Salt Water Mixing Zone in Coastal Aquifers

Ground Water ◽  
2009 ◽  
Vol 47 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Eyal Shalev ◽  
Ariel Lazar ◽  
Stuart Wollman ◽  
Shushanna Kington ◽  
Yoseph Yechieli ◽  
...  
Keyword(s):  
Fresh Water ◽  
Coastal Aquifers ◽  
Salt Water ◽  
Mixing Zone ◽  
Water Mixing ◽  
Water Salt

The Influence of Runoff and Tide on the Salt-Fresh Water Mixing in Estuaries: A Flume Experiment

APAC 2019 ◽  
2019 ◽  
pp. 1399-1406
Author(s):  
W. Y. Xia ◽  
X. D. Zhao ◽  
X. Z. Zhang ◽  
X. M. Wang
Keyword(s):  
Fresh Water ◽  
Flume Experiment ◽  
Water Mixing

Study on Salinity Stratification and Distribution in Lingding Yang Estuary

2008 ◽  
Author(s):  
Mingyuan Yang ◽  
Wei Zhang
Keyword(s):  
Fresh Water ◽  
Salt Water ◽  
Flood Tide ◽  
Tidal Range ◽  
Observation Data ◽  
The South ◽  
Wet Season ◽  
Mean Velocity ◽  
Temporal And Spatial Distribution ◽  
The North

Ling Ding Yang (LDY) estuary is one of the main parts of the whole Zhujiang estuary, which lies in the south sea, China. It is about 60km wide from Hong Kong in the east to Macao in the west and the water areas are approximately 2110 km2. The mixing process of salt water and fresh water in the estuary is influenced by many factors, such as the estuarine geometry, tidal range and ravine flows, etc. In this paper, based on the data from the tidal gauge stations and synchronously surveyed data during July 2003, a study on the temporal and spatial distribution characteristics of salinity was made. According to the observation data, in wet season, the fresh water and salt water mixes with the N parameter between 0.21 and 1.63. The distribution of salinity concentration in the east part of LDY is due to coriolis’ force. The salinity concentration decreases from the sea to the estuary, and there exists apparent division point, Nei Lingding Island. To the south of Nei Lingding Island, it is almost partially mixed, and to the north of Nei Lingding Island, it belongs to highly stratification. At the same time, the stratification parameter and the vertical mean velocity in wet season are compared. The N parameter changes with the velocity of tide flow in a tidal cycle. The value of N in a flood tide is usually larger than that is in an ebb tide. That is to say, the mix intensity is much bigger in the flood tide.

scholarly journals Modelling the salinity response to fresh water flow and variable tidal amplitude in an idealized river delta 

2021 ◽  
Author(s):  
Constantinos Matsoukis ◽  
Laurent O. Amoudry ◽  
Lucy Bricheno ◽  
Nicoletta Leonardi
Keyword(s):  
Fresh Water ◽  
Water Flow ◽  
River Flow ◽  
Water Layer ◽  
Tidal Range ◽  
Water Volume ◽  
Human Consumption ◽  
Tidal Amplitude ◽  
Salinity Response ◽  
Advection Diffusion Equation

<p>High salinity values in deltaic regions can be detrimental for agriculture, aquaculture and human consumption. Salinity levels in river deltas could significantly increase due to sea level rise and infrastructure works such as river diversions or dam constructions. River flow and tides have a large influence on salinity concentrations and it is thus important to understand their combined role. In this paper, a 3D model is built for an idealized delta. A series of simulations is carried out to investigate salinity fields developed under the combined action of tidal amplitude and fresh water flow. Simulations are classified based on the ratio between fresh water and tidal range. Both tide influenced and river dominated cases were considered. Results emphasize the importance of tidally driven mixing which can establish fresher conditions in the delta for certain amplitudes. Tidal amplitude increase enhances the flow in the delta and enlarges the fresh water layer thickness and length. On the other hand, the maximum tidal ranges can limit significantly the fresh water volume. The spatiotemporal salinity distribution is described in terms of delta topology and network geometry. Salinity and river discharge were found to be negatively and exponentially correlated by an equation that resembles solutions of the 1D advection-diffusion equation. Large bathymetric differences between delta areas were identified to play a key role on the salinity patterns as they can modify the nature of the extracted relationships and correlations.</p>

scholarly journals Effect of Curing on Mechanical Properties of Cement-Stabilized Coral Sand in Marine Environment

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Mingyuan Chen ◽  
Jiuguang Geng ◽  
Haocheng Xiong ◽  
Tao Shang ◽  
Cheng Xue ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fresh Water ◽  
Marine Environment ◽  
Cement Content ◽  
Early Stage ◽  
Road Construction ◽  
Chloride Ion ◽  
Ion Concentration ◽  
Water Mixing ◽  
Coral Sand

The use of coral sand prepared from cement-stabilized materials can significantly reduce the cost, construction period, and damage to the environment caused by stone mining. The choice of water in mixing and curing the cement-stabilized materials on islands should be considered. Cement-stabilized coral sand was tested in three different preparation and maintenance systems in the marine environment. The compressive strength, weight change, and chloride ion concentration change in cement-stabilized coral sand with different cement content were measured after 7 d, 28 d, 60 d, and 90 d, respectively. The microstructure of specimens was observed by XRD and SEM. Results show that the compressive strength of specimens in the seawater mixing and seawater curing system developed 0.9 MPa faster than that in the fresh water mixing and curing system at an early stage. But the compressive strength of specimens in seawater mixing and seawater curing shrank later, being 0.5 MPa lower than that in fresh water mixing and curing. The cement content was positively correlated with the free chloride ion reaction and mass growth rate. For road construction on islands, the mixing and curing of cement-stabilized coral sand with seawater should be given priority in the early stage.

scholarly journals Mixing-driven diagenesis and mineral deposition: CaCO3precipitation in salt water - fresh water mixing zones

2003 ◽  
Vol 30 (5) ◽  
pp. n/a-n/a ◽  
Author(s):  
Brian Berkowitz ◽  
Olga Singurindy ◽  
Robert P. Lowell
Keyword(s):  
Fresh Water ◽  
Salt Water ◽  
Water Mixing ◽  
Mineral Deposition
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