Fully integrated and physically-based approach for simulating water flows in a large-scale, heavily-agricultural and low-instrumented watershed

Tagnon, Bertrand Ouessé; Oularé, Sékouba; Kouame, Kouassi Innocent; Kouassi, Kouamé Auguste; Kouadio, Zilé Alex; Savané, Issiaka

doi:10.1016/j.jhydrol.2020.124781

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…In the Sahel, HGS has been used to study the interaction between surface water and groundwater (Bambara, 2021), in order to assess the impacts of climate change, and quantify the recharge (Boko, 2020), but also to reconstruct groundwater level records (Kafando, 2022). Tagnon et al (2020), used HGS in a data-scarce area heavily impacted by agriculture. They obtained fairly conclusive results with minimal calibration effort.…”

Section: Choice Of the Hydrogeological Modelmentioning

confidence: 99%

Building a regional hydrogeological model in a data-scarce area and implications for local scale studies: Case of the Tim Mersoï Basin (Northwestern Niger)

Dobi,

Boubacar,

Kouakou

et al. 2023

Preprint

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This study investigates the feasibility of implementing a 3D hydrogeological model in a vast data-scarce area in northwestern Niger where groundwater resources are strongly impacted by climate changes and anthropogenic activities (uranium mining) in northwestern Niger, West Africa. A large scale fully integrated hydrological model was built and calibrated using HydroGeoSphere. The model conceptualization and parametrization were done using various sources of datasets. The model was calibrated using a stepwise approach by increasing the temporal resolution of the model inputs: steady state, dynamic equilibrium, and transient state. The calibration results showed that the model could reproduce the measured groundwater heads with a correlation coefficient of up to 0.79. The model was then validated by comparing total water storage computed from GRACE data over the TMB and the outputs of the model. The results showed the model reproduced quite well the amplitudes and direction of the variations measured by GRACE. Therefore, GRACE data were useful in the qualitative validation of the model. The outputs of the model allowed a quantitative analysis of the groundwater resources of the Tim Mersoï Basin (TMB). The global recharge was estimated at 15.74 mm/year, i.e., an interannual average of 13.58% of the rainfall. Most importantly, this model can be used in a hierarchical model set up to provide initial and boundary conditions for local scales (mining areas for example) studies.

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Section: Choice Of the Hydrogeological Modelmentioning

confidence: 99%

Building a regional hydrogeological model in a data-scarce area and implications for local scale studies: Case of the Tim Mersoï Basin (Northwestern Niger)

Dobi,

Boubacar,

Kouakou

et al. 2023

Preprint

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“…In HGS, several parameters are required to parameterize surface flow, subsurface flow, and evapotranspiration. In this study, these parameters are prescribed using values from previous studies with similar soil composition and vegetation (Goderniaux et al 2009;Boubacar et al 2020;Tagnon et al 2020). Details of these parameters are presented in Table 1.…”

Section: Model Setupmentioning

confidence: 99%

Assessing future climate trends and their impact on different fractured rock aquifers in Northern Togo

Akara

Reeves

Gnazou

et al. 2022

Journal of Water and Climate Change

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A fully integrated hydrologic model of the Koumfab watershed in Northern Togo is used to study the impact of climate change on water resources. Bias-corrected temperature and precipitation from four regional climate models (RCMs) and two greenhouse emissions scenarios are used as climate forcings for the integrated model. Climate projections from the four RCMs indicate a rise (1.4–5.5 °C) in average temperature from the control (1971–2000) to the future period (2031–2060). Projected precipitation follows two contrasting trends with some RCMs predicting an increase (by up to 14%) in mean annual precipitation, while others predict a decline (by up to 14%). These changes in precipitation and temperature have a noticeable effect on groundwater levels and streamflow. The model indicates a decline in groundwater levels for all future climate projections by 1.4–5.7 m. The projected streamflow at the watershed outlet shows increasing (59–332%) and decreasing trends (39–100%).

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A hybrid approach for integrated surface and subsurface hydrologic simulation of baseflow with Iterative Ensemble Smoother

Delottier

Therrien

Young

et al. 2022

Journal of Hydrology

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Fully integrated and physically-based approach for simulating water flows in a large-scale, heavily-agricultural and low-instrumented watershed

Cited by 4 publications

References 25 publications

Building a regional hydrogeological model in a data-scarce area and implications for local scale studies: Case of the Tim Mersoï Basin (Northwestern Niger)

Building a regional hydrogeological model in a data-scarce area and implications for local scale studies: Case of the Tim Mersoï Basin (Northwestern Niger)

Assessing future climate trends and their impact on different fractured rock aquifers in Northern Togo

A hybrid approach for integrated surface and subsurface hydrologic simulation of baseflow with Iterative Ensemble Smoother

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