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

The characterization of water level fluctuations is crucial to explain the hydrological processes that contribute to the maintenance of the structure and function of wetlands. The aim of this study was to develop a method based on remote sensing to characterize and map the water level variation patterns, evapotranspiration, discharge, and rainfall over wetlands in the Gravataí River basin, Rio Grande do Sul (RS), Brazil. For this purpose, ground-based measurements of rainfall, water discharge, and evapotranspiration together with satellite data were used to identify the apparent water level based on the normalized difference water index (NDWI). Our results showed that the variation of the water level followed the rainfall, water discharge, and evapotranspiration seasonal patterns in the region. The NDWI showed similar values to the ground-based data collected 10 days prior to satellite image acquisition. The proposed technique allows for quantifying the pattern of flood pulses, which play an important role for establishing the connectivity between different compartments of wetlands in the study area. We conclude that our methodology based on the use of satellite data and ground measurements was a useful proposition to analyze the water level variation patterns in an area of great importance in terms of environmental degradation and use of agriculture. The information obtained may be used as inputs in hydrologic models, allowing researchers to evaluate the impact, at both local and regional scales, caused by advance of agriculture into natural environments such as wetlands.

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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 ◽

10.3390/w13101328 ◽

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.

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Integrated factor analysis of water level variation in geographically isolated ponds

Environmental Science and Pollution Research ◽

10.1007/s11356-020-09959-8 ◽

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

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Soil-water-air coupled seismic behavior accompanying internal water level variation of an unsaturated embankment with an enclosed saturation area on cohesive soil ground

Japanese Geotechnical Society Special Publication ◽

10.3208/jgssp.jpn-077 ◽

2016 ◽

Vol 2 (18) ◽

pp. 670-675

Author(s):

Toshihiro Noda ◽

Takahiro Yoshikawa ◽

Toshihiro Takaine

Keyword(s):

Water Level ◽

Soil Water ◽

Seismic Behavior ◽

Cohesive Soil ◽

Level Variation ◽

Water Level Variation ◽

Internal Water

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Assessing the impacts of climatic and anthropogenic factors on water level variation in the Taihu Plain based on non-stationary statistical models

Environmental Science and Pollution Research ◽

10.1007/s11356-020-08889-9 ◽

2020 ◽

Vol 27 (18) ◽

pp. 22829-22842

Author(s):

Yuefeng Wang ◽

Youpeng Xu ◽

Song Song ◽

Jie Wang ◽

Junyi Zhang

Keyword(s):

Water Level ◽

Statistical Models ◽

Anthropogenic Factors ◽

Level Variation ◽

Water Level Variation

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

Brazilian Journal of Biology ◽

10.1590/s1519-69842005000300003 ◽

2005 ◽

Vol 65 (3) ◽

pp. 387-394 ◽

Cited By ~ 15

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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