Impact of hydraulic and storage properties on river leakage estimates

A numerical groundwater flow model case study from southern Benin

Kodjo Apelete Raoul Kpegli*, Sjoerd E.A.T.M. van der Zee, Abdoukarim Alassane, George Bier, Moussa Boukari, Anton Leijnse, Perry G.B. de Louw, Daouda Mama

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Study area: The coastal sedimentary basin including the Zou and Ouémé rivers in Benin. Study focus: River discharge loss is known to occur on the Zou and Ouémé rivers in southern Benin since a couple of decades ago. The reason behind this discharge reduction remained so far unclear. In this study, we focus on creating a 3D-numerical model of the system and on evaluating the sensitivity of leakage between the rivers and aquifers to various parameters. New hydrological insights for the region: Results show that leakages along the Zou river and Ouémé stream are tiny (i.e., ∼3% of the discharge losses). This implies that the observed water loss from the Zou and Ouémé rivers is not likely caused by the leakage (infiltration) along these rivers into the subsurface. The streambed conductance is found to be among the factors that impact less the computed leakages in the study area. This study has ranked the different hydraulic and storage properties in their order of importance with respect to the computation of river leakages along the concerned rivers. The determined rank of importance of the hydraulic and storage properties can guide river leakage modelling exercises in similar regions elsewhere.

Original languageEnglish
Pages (from-to)136-163
JournalJournal of Hydrology: Regional Studies
Volume19
DOIs
Publication statusPublished - 1 Oct 2018

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leakage
groundwater flow
hydraulics
river
river discharge
sedimentary basin
infiltration
aquifer
modeling
loss

Keywords

  • Benin
  • Discharge loss
  • Flow modelling
  • Groundwater recharge
  • Ouémé
  • River leakage

Cite this

@article{8cf92a9e74054487a809566ce9ff529d,
title = "Impact of hydraulic and storage properties on river leakage estimates: A numerical groundwater flow model case study from southern Benin",
abstract = "Study area: The coastal sedimentary basin including the Zou and Ou{\'e}m{\'e} rivers in Benin. Study focus: River discharge loss is known to occur on the Zou and Ou{\'e}m{\'e} rivers in southern Benin since a couple of decades ago. The reason behind this discharge reduction remained so far unclear. In this study, we focus on creating a 3D-numerical model of the system and on evaluating the sensitivity of leakage between the rivers and aquifers to various parameters. New hydrological insights for the region: Results show that leakages along the Zou river and Ou{\'e}m{\'e} stream are tiny (i.e., ∼3{\%} of the discharge losses). This implies that the observed water loss from the Zou and Ou{\'e}m{\'e} rivers is not likely caused by the leakage (infiltration) along these rivers into the subsurface. The streambed conductance is found to be among the factors that impact less the computed leakages in the study area. This study has ranked the different hydraulic and storage properties in their order of importance with respect to the computation of river leakages along the concerned rivers. The determined rank of importance of the hydraulic and storage properties can guide river leakage modelling exercises in similar regions elsewhere.",
keywords = "Benin, Discharge loss, Flow modelling, Groundwater recharge, Ou{\'e}m{\'e}, River leakage",
author = "Kpegli, {Kodjo Apelete Raoul} and {van der Zee}, {Sjoerd E.A.T.M.} and Abdoukarim Alassane and George Bier and Moussa Boukari and Anton Leijnse and {de Louw}, {Perry G.B.} and Daouda Mama",
year = "2018",
month = "10",
day = "1",
doi = "10.1016/j.ejrh.2018.07.004",
language = "English",
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journal = "Journal of Hydrology: Regional Studies",
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Impact of hydraulic and storage properties on river leakage estimates : A numerical groundwater flow model case study from southern Benin. / Kpegli, Kodjo Apelete Raoul; van der Zee, Sjoerd E.A.T.M.; Alassane, Abdoukarim; Bier, George; Boukari, Moussa; Leijnse, Anton; de Louw, Perry G.B.; Mama, Daouda.

In: Journal of Hydrology: Regional Studies, Vol. 19, 01.10.2018, p. 136-163.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Impact of hydraulic and storage properties on river leakage estimates

T2 - A numerical groundwater flow model case study from southern Benin

AU - Kpegli, Kodjo Apelete Raoul

AU - van der Zee, Sjoerd E.A.T.M.

AU - Alassane, Abdoukarim

AU - Bier, George

AU - Boukari, Moussa

AU - Leijnse, Anton

AU - de Louw, Perry G.B.

AU - Mama, Daouda

PY - 2018/10/1

Y1 - 2018/10/1

N2 - Study area: The coastal sedimentary basin including the Zou and Ouémé rivers in Benin. Study focus: River discharge loss is known to occur on the Zou and Ouémé rivers in southern Benin since a couple of decades ago. The reason behind this discharge reduction remained so far unclear. In this study, we focus on creating a 3D-numerical model of the system and on evaluating the sensitivity of leakage between the rivers and aquifers to various parameters. New hydrological insights for the region: Results show that leakages along the Zou river and Ouémé stream are tiny (i.e., ∼3% of the discharge losses). This implies that the observed water loss from the Zou and Ouémé rivers is not likely caused by the leakage (infiltration) along these rivers into the subsurface. The streambed conductance is found to be among the factors that impact less the computed leakages in the study area. This study has ranked the different hydraulic and storage properties in their order of importance with respect to the computation of river leakages along the concerned rivers. The determined rank of importance of the hydraulic and storage properties can guide river leakage modelling exercises in similar regions elsewhere.

AB - Study area: The coastal sedimentary basin including the Zou and Ouémé rivers in Benin. Study focus: River discharge loss is known to occur on the Zou and Ouémé rivers in southern Benin since a couple of decades ago. The reason behind this discharge reduction remained so far unclear. In this study, we focus on creating a 3D-numerical model of the system and on evaluating the sensitivity of leakage between the rivers and aquifers to various parameters. New hydrological insights for the region: Results show that leakages along the Zou river and Ouémé stream are tiny (i.e., ∼3% of the discharge losses). This implies that the observed water loss from the Zou and Ouémé rivers is not likely caused by the leakage (infiltration) along these rivers into the subsurface. The streambed conductance is found to be among the factors that impact less the computed leakages in the study area. This study has ranked the different hydraulic and storage properties in their order of importance with respect to the computation of river leakages along the concerned rivers. The determined rank of importance of the hydraulic and storage properties can guide river leakage modelling exercises in similar regions elsewhere.

KW - Benin

KW - Discharge loss

KW - Flow modelling

KW - Groundwater recharge

KW - Ouémé

KW - River leakage

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DO - 10.1016/j.ejrh.2018.07.004

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JO - Journal of Hydrology: Regional Studies

JF - Journal of Hydrology: Regional Studies

SN - 2214-5818

ER -