scholarly journals Development of 3-D Salt Intrusion Numerical Model and Its Application to Kino River Estuary

2003 ◽  
Vol 47 ◽  
pp. 1009-1014
Author(s):  
Kazunori KITAYAMA ◽  
Futoshi NAKANISHI ◽  
Hidenobu ARAKAWA ◽  
Keiji NAKATSUJI ◽  
Takuya SHIRAHASE ◽  
...  
Keyword(s):  
Numerical Model ◽  
River Estuary ◽  
Salt Intrusion

scholarly journals Comparison of empirical models with intensively observed data for prediction salt intrusion in the Sumjin River estuary, Korea

2009 ◽  
Vol 6 (2) ◽  
pp. 1879-1905 ◽  
Author(s):  
D. C. Shaha ◽  
Y.-K. Cho
Keyword(s):  
River Discharge ◽  
Neap Tide ◽  
Spring Tide ◽  
River Estuary ◽  
High Water ◽  
Empirical Models ◽  
Length Scale ◽  
Salt Intrusion ◽  
Salinity Data ◽  
Comparative Results

Abstract. Intensive measurements of salt intrusion in the Sumjin River estuary were taken at high and low waters during both spring and neap tides in each season from August 2004 to April 2007. The estuary demonstrated partially- and well-mixed characteristics during the spring tide and stratified condition during the neap tide. The salt intrusion at high water varied from about 13.39 km in summer 2005 to 25.62 km in autumn 2006. The salt intrusion depended primarily on the freshwater discharges rather than those of spring-neap tidal oscillations. Analysis of three years of observed salinity data indicated that the salt intrusion length scale in the Sumjin River estuary was proportional to the river discharge to the −1/5 power. Five empirical models were applied to the Sumjin River estuary to explore the most suitable as an easy-to-use tool for prediction of the salt intrusion length as functions of the geometry, river discharge and tide. Comparative results showed that the Nguyen and Savenije (2006) model developed under both partially- and well-mixed estuaries yielded the most satisfactory results of all the models studied for computing the salt intrusion length in the Sumjin River estuary. Our study suggests that the model can generate reasonable results for stratified conditions also.

scholarly journals NUMERICAL SIMULATION STUDY ON DEPOSITION DOWNSTREAM ESTUARINE SLUICE

2012 ◽  
Vol 1 (33) ◽  
pp. 8 ◽  
Author(s):  
Xiping Dou ◽  
Xinzhou Zhang ◽  
Xiangming Wang ◽  
Jinhua Wang
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Physical Model ◽  
Feasibility Study ◽  
Simulation Study ◽  
Salt Intrusion ◽  
3D Numerical Model ◽  
2D Numerical Model

In order to resist tides and salt intrusion, there have been more than 300 tidal gates built at many river estuaries in China since 1960s. However, the serious deposition occurred at a lot of gates due to the changes of hydrodynamic and sediment conditions and lack of discharge from the rivers. At present, the research is mainly to analyze the reasons for siltation downstream gates and the measures of dredging. It is not enough for study on distribution simulation of deposition downstream sluice. Studies have shown that 2D numerical model cannot reflect the distribution of sediment siltation downstream gates. Therefore, it needs to develop 3D sediment numerical model for deposition prediction. In this paper, combined the feasibility study of a tidal gate at Mulanxi River, a physical model and 3D numerical model of sediment siltation downstream gate are conducted.

Numerical Model on Hydrodynamic Impact from HZM Bridge

2014 ◽  
Vol 580-583 ◽  
pp. 2146-2149
Author(s):  
Jie He ◽  
Ying Jun Sun ◽  
Xin Sheng Zhao
Keyword(s):  
Numerical Model ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
Hydrodynamic Impact ◽  
Variable Bottom ◽  
Triangular Cell ◽  
Bed Slope ◽  
The Pearl River ◽  
Volume Method

In this paper, a 2D model for the simulation of shallow water flow by convection and diffusion over variable bottom is presented, which is based on the FVM (finite volume method) over triangular unstructured grids. The format of Reo’s approximate Riemann is adopted to solve the flux terms. And the bed slope source term is treated by split in the form of the flux eigenvector. For the diffusion terms, the divergence theorem is employed to obtain the derivatives of a scalar variable on each triangular cell. The numerical model is adopted to simulate the hydrodynamic impact from HZM (Hongkong-Zhuhai-Macao) bridge on Pearl River estuary. The simulated results show that the HZM bridge has little influence on the distribution of hydrodynamic environment in the Pearl River estuary.

Hudson River Fishes and their Environment

2006 ◽  
Keyword(s):  
Water Surface ◽  
Local Heating ◽  
River Sediments ◽  
River Estuary ◽  
Hudson River ◽  
Hudson River Estuary ◽  
Salt Intrusion ◽  
Salinity Stratification ◽  
Flushing Time ◽  
Shear Dispersion

<em>Abstract.</em>—The Hudson River Estuary can be classified as a drowned river valley, partially mixed, tidally dominated estuary. Originally, it had a fjord-like morphology as a result of glacial scour which filled in over the past 3,000 years with river sediments. The hydrodynamics of the estuary are best described by the drivers of circulation, including the upstream river inflows, the oceanographic conditions at the downstream end, and meteorological conditions at the water surface and the response of the waters to these drivers in terms of tides and surges, currents, temperature, and salinity. Freshwater inflow is predominantly from the Mohawk and Upper Hudson rivers at Troy (average flow = 400 m<sup>3</sup>/s, highest in April, lowest in August). At the downstream end at the Battery the dominant tidal constituent is the semidiurnal, principal lunar constituent (the M<sub>2</sub> tide), with an evident spring/neap cycle. The amplitude of the tide is highest at the Battery (67 cm), lower at West Point (38 cm), and higher again at Albany (69 cm), a function of friction, geometry, and wave reflection. Meteorological events can also raise the water surface elevation at the downstream end and propagate into the estuary. Freshwater pulses can raise the water level at the upstream end and propagate downstream. Tidal flows are typically about an order of magnitude greater than net flows. The typical tidal excursion in the Hudson River Estuary is 5–10 km, but it can be as high as 20 km. Temperature varies seasonally in response to atmospheric heating and cooling with a typical August maximum of 25°C and January-February minimum of 1°C. Power plants cause local heating. The salinity intrusion varies with the tide and amount of upstream freshwater input. The location of the salt front is between Yonkers and Tappan Zee in the spring and just south of Poughkeepsie in the summer. Vertical salinity stratification exists in the area of salt intrusion setting up an estuarine circulation. The effect of wind is limited due to a prevailing wind direction perpendicular to the main axis and the presence of cliffs and hills. Dispersive processes include shear dispersion and tidal trapping, resulting in an overall longitudinal dispersion coefficient of 3–270 m<sup>2</sup>/s. The residence or flushing time in the freshwater reach is less than 40 d in the spring and about 200 d in the summer. In the area of salt intrusion, it is about 8 d.

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