scholarly journals A NUMERICAL MODEL OF NEARSHORE CURRENTS DUE TO IRREGULAR WAVES

1988 ◽  
Vol 1 (21) ◽  
pp. 83 ◽  
Author(s):  
Masataka Yamaguchi
Keyword(s):  
Numerical Model ◽  
Water Level ◽  
Wave Height ◽  
Wave Model ◽  
Irregular Waves ◽  
Wave Transformation ◽  
Level Variation ◽  
Water Level Variation ◽  
Mean Water Level ◽  
Nearshore Currents

This paper presents a numerical model of nearshore currents due to irregular waves. The radiation stress is estimated by a current-depth refraction model for irregular waves, in which the energy dissipation due to wave breaking is modeled through the use of a saturated frequency spectrum in shallow water. The model is in reasonable agreement with measured wave height, mean water level variation and observed nearshore current patterns. Next, the model is applied to the computation of wave transformation and nearshore currents on a uniformly sloping beach and on model topographies with complicated contour lines. Comparison with the results based on a regular wave model shows that wave irregularity has a smoothing effect on cross-shore distributions of wave height, mean water level variation and longshore currents, but that it does not have much effect on nearshore current patterns.

scholarly journals Analysis of the Water Level Variation in the Polish Part of the Vistula Lagoon (Baltic Sea) and Estimation of Water Inflow and Outflow Transport through the Strait of Baltiysk in the Years 2008–2017

Water ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1328
Author(s):  
Michał Szydłowski ◽  
Wojciech Artichowicz ◽  
Piotr Zima
Keyword(s):  
Statistical Analysis ◽  
Numerical Model ◽  
Baltic Sea ◽  
Water Level ◽  
Vistula Lagoon ◽  
Level Variation ◽  
The Baltic Sea ◽  
Water Level Variation ◽  
The Baltic ◽  
The Vistula Lagoon

The Vistula Lagoon is located in both Poland and Russia along the southern coast of the Baltic Sea. It is connected to the Baltic Sea in the Russian part by the Strait of Baltiysk. The purpose of the paper is to identify the dominant factors underlying the water level variation mechanism at Tolkmicko in the Vistula Lagoon, revealed by a statistical analysis of the measured data and a discussion on the inflow and outflow transport variation through the strait, estimated by numerical modeling. Seawater transport is exceptionally valuable in terms of the hydrological water balance in the lagoon. Historical research on the hydrology of the lagoon shows that the water exchange in the lagoon is quite complex due to the presence of several different sources of water balance, such as seawater inflow, river inflow, groundwater inflow, precipitation, and evaporation. Unfortunately, there are no current data on seawater inflow and outflow through the Strait of Baltiysk due to the lack of continuous flow measurements in the strait. A novelty of the current work is an in-depth statistical analysis of the water level variation in the Polish part of the lagoon over a long time period and an estimation of water transport through the Strait of Baltiysk by use of a numerical model. The model reproduces well the water level variation responding to variations in the sea level outside the lagoon and the wind action over the lagoon. The years 2008–2017 were chosen as the analysis period. A two-dimensional free surface shallow water numerical model of the lagoon was adapted to simulate the water level variation in view of the wind over the lagoon and the sea level variation at one open boundary. Finally, it was concluded that the water level variation on the Polish side of the Vistula Lagoon is dominated by two factors: the water level in the Gulf of Gdańsk and the wind over the lagoon. The average annual marine water inflow into the Vistula Lagoon was estimated to be equal to 15.87 km3.

scholarly journals FIELD STUDY OF WIND TIDE IN SEMI-ENCLOSED SHALLOW BASINS

2020 ◽  
pp. 27
Author(s):  
Caroline Paugam ◽  
Damien Sous ◽  
Vincent Rey ◽  
Samuel Meule
Keyword(s):  
Water Level ◽  
Water Surface ◽  
Physical Phenomenon ◽  
Relative Effect ◽  
Wind Effect ◽  
Strong Wind ◽  
Level Variation ◽  
Water Level Variation ◽  
Mean Water Level ◽  
The Mean

The aim of the study is to understand the wind effect on mean water level variation in semi-enclosed shallow basins. The studied physical phenomenon is nearly steady water surface tilting due to wind stress, the so-called wind tide (Platzman (1963)). During strong wind conditions, wind tides can have significant consequences on low-lying areas such as submersion and flooding. Two field sites are monitored in the S-E of France to characterize wind tides and more specifically to understand the relative effect of wind magnitude and depth on the mean water level dynamics.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/Q30I0taty9w

Integrated factor analysis of water level variation in geographically isolated ponds

2020 ◽  
Vol 27 (31) ◽  
pp. 38861-38870
Author(s):  
Yufeng Li ◽  
Yuqin Wu ◽  
Alan Wright ◽  
Jiayi Xu ◽  
Hongyu Liu ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Water Level ◽  
Level Variation ◽  
Water Level Variation ◽  
Geographically Isolated

scholarly journals Study of Water Level Variation in the Reservoir at the Ilha Solteira Dam (Brazil) Based on Geodesic Remote Sensing

2019 ◽  
Vol 42 (1) ◽  
pp. 490-495
Author(s):  
J. R. S. OLIVEIRA ◽  
J. MARCATO ◽  
F. S. PROL ◽  
R. MACHADO ◽  
F. B. DALMAS ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Water Level ◽  
Level Variation ◽  
Water Level Variation

scholarly journals Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil

2005 ◽  
Vol 65 (3) ◽  
pp. 387-394 ◽  
Author(s):  
P. M. Andrade ◽  
F. M. S. Braga
Keyword(s):  
Water Level ◽  
Air Temperature ◽  
Relative Frequency ◽  
Reproductive Activity ◽  
Seasonal Reproduction ◽  
Level Variation ◽  
Reproductive Seasonality ◽  
Water Level Variation ◽  
Dam Operation ◽  
Fish Gonads

We searched for correlations between water level, rainfall, temperature, and reproductive activity of fishes in a lotic stretch of the Grande River below the Volta Grande Dam. Gillnets were used to catch the fish on six field journeys made bimonthly between April 1998 and February 1999. Fish gonads were classified according to maturation grade and the amount of mature or spent gonads was correlated with rainfall and air temperature. Most fish species showed seasonal reproduction (between October and February). The relative frequency of fully mature and spent gonads significantly correlated with rainfall (Spearman r = 0.94, p = 0.005) and air temperature (r = 0.84, p = 0.036), showing the importance of these factors in regulating the reproductive cycle of fishes in this location. Nevertheless, dam operation resulted in minimal water level variation that did not significantly correlate with reproductive activity (r = -0.43, p = 0.396).

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