Hydrodynamic Modeling of Nokoué Lake in Benin

Zandagba, Josué; Moussa, Mohamed; Obada, Ezéchiel; Afouda, Abel

doi:10.3390/hydrology3040044

Cited by 13 publications

(17 citation statements)

References 7 publications

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“…This error would probably be propagated into model simulation when hydrodynamic numerical models are used for nutrient management, biogeochemical processes simulation, hydraulic structures, etc. (Seo et al, 2010;Xue et al, 2017;Zandagba et al, 2016). This issue is especially important for geodetic missions, like CryoSat-2 and SARAL, due to geoid height variation along and across ground tracks.…”

Section: Plateaumentioning

confidence: 99%

Influence of local geoid variation on water surface elevation estimates derived from multi-mission altimetry for Lake Namco

Jiang

Andersen

Nielsen

et al. 2019

Remote Sensing of Environment

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Water surface elevation (WSE) is an essential quantity for water resource monitoring and hydrodynamic modeling. Satellite altimetry has provided data for inland waters. The height that is derived from altimetry measurement is ellipsoidal height. In order to convert the ellipsoidal height to orthometric height, which has physical meaning, accurate estimates of the geoid are needed. This paper evaluates the suitability of geodetic altimetric measurements for improvement of global geoid models over a large lake in the Tibetan Plateau. CryoSat-2 and SARAL/AltiKa are used to derive the high-frequency geoid correction. A validation of the local geoid correction is performed with data from in-situ observations, a laser altimetry satellite (ICESat), a Ka-band radar altimetry satellite (SARAL) and a SAR radar altimetry satellite (Sentinel-3). Results indicate that, geodetic altimetric dataset can capture the high-resolution geoid information. By applying local geoid correction, the precision of ICESat, SARAL and Sentinel-3 retrievals are significantly improved. We conclude that using geodetic altimetry to correct for local geoid residual over large lakes significantly decreases the uncertainty of estimates of WSE. These results also indicate the potential of geodetic altimetry missions to determine local geoid residual with centimeterlevel accuracy, which can be incorporated to improve global and regional geopotential models.

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Section: Plateaumentioning

confidence: 99%

Influence of local geoid variation on water surface elevation estimates derived from multi-mission altimetry for Lake Namco

Jiang

Andersen

Nielsen

et al. 2019

Remote Sensing of Environment

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“…Depending on the size of the inputs and the volume of the water body, the variation in renewal can be significant [14]. The way to estimate the time of renewal is variable, and can be done with hydrodynamic models, used to simulate water surface elevation, exchanged flows and velocities [7,15], or by the use of tracers, such as the stable isotope ratios of hydrogen and oxygen or tritium-helium-3 isotope, among others [4,16], or by means of water balance when it is possible to make measurements of inflows or outflows.…”

Section: Introductionmentioning

confidence: 99%

Residence Time Analysis in the Albufera of Valencia, a Mediterranean Coastal Lagoon, Spain

et al. 2021

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The Albufera of Valencia is a coastal lagoon located in the western area of the Mediterranean Sea, in the Iberian Peninsula. It has an area of 23.1 km2 and an average depth of only 1 m, with a maximum depth of 1.6 m. This lagoon is the remnants of an original and more extensive wetland of about 220 km2 which is now mostly dedicated to rice cultivation. Surface water is supplied through several main and many secondary canals for a total of 64 water entry points and three exit points to the sea. It is difficult to evaluate the residence time due to the lack of reliable measurements of the inflow or outflow, as well as continuous measurements. Between 1988 and 2018, several procedures were used, the results of which are outlined in this document. Overall, a decrease in the inflow during these thirty years was observed and, therefore, it can be concluded that the residence time is increasing. There is a temporal variation during the year due to rainfall and cultivation periods. Likewise, the results found that the natural hydrological zoning of the lagoon causes a spatial heterogeneity with small Northern areas with low residence time of 4.7 days, almost on a weekly basis and large Western extensions with high residence time of 222.9 days. It is impossible to know this information if individual flow measurements are not taken from each of the main watercourses.

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“…Each year, lake Nokoué undergoes successive phases of fresh water and saline water respectively controlled by the water input from the tributaries during the flood period and the amplitude of the tide. (Le Barbé et al 1993;Mama et al, 2011;Zandagba et al, 2016 ;Djihouessi and Aina, 2018). Therefore, a numerical modelling approach was developed to understand the salinity dynamic at the outlet of Lake Nokoué and to simulate the nutrient flushing from the lake into the Atlantic Ocean.…”

Section: Introductionmentioning

confidence: 99%

Toward the understanding of saline water intrusion and nutrient flushing in Lake Nokoué

Djihouessi¹,

Houngue²,

Adandedji³

et al. 2021

Preprint

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To understand the salinity dynamic at the outlet of Lake Nokoué and to simulate the nutrient flushing from this lake into the Atlantic Ocean, a 2D hydrodynamic model was designed with Mike 21. The choice of the Mike 21 was motivated by the long practice that decision-makers in Benin have with this software. The Hydrodynamics (HD) module simulated water level variations and flows in response, while the ECO-Lab module has been used for water quality modelling. The data used covered the hydrological period of 2013. The results from the HD simulation indicated that for a flow of 725 m3/s at Bonou on the Ouémé River, a tributary of Lake Nokoué. 70% of the land in the delta of Ouémé, between the Ouémé River and the So River (also a tributary of Lake Nokoué), are flooded against 90% for a river flow of 1100 m3/s. The water level in the delta showed a water increase of 0.6 m, in seven days, for a water flow of 725 m3/s at Bonou and a water increase of 1.3 m, in seven days, for a water flow of 1100 m3/s at Bonou. Water quality simulations indicated that the seawater intrusion from the Atlantic Ocean into Lake Nokoué occurred from the bottom to the surface towards the surface of the lake. During flooding, despite the large inflow of fresh water, more than 60% of the water at the bottom of the lake had concentrations greater than 8. Simulation of the dispersion of nutrient point source pollution indicated that there was an accumulation of pollution at the bottom of the lake during low water periods. This accumulation increases in amplitude as one moves away from the Atlantic Ocean towards the north of the lake. In this period tidal flushing evacuated about 20% of the pollution ejected. In the high water period, about 70% of the pollution ejected in the lake was automatically flushed out in the lake the Atlantic Ocean.

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Hydrodynamic Modeling of Nokoué Lake in Benin

Cited by 13 publications

References 7 publications

Influence of local geoid variation on water surface elevation estimates derived from multi-mission altimetry for Lake Namco

Influence of local geoid variation on water surface elevation estimates derived from multi-mission altimetry for Lake Namco

Residence Time Analysis in the Albufera of Valencia, a Mediterranean Coastal Lagoon, Spain

Toward the understanding of saline water intrusion and nutrient flushing in Lake Nokoué

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