GroMoPo Metadata for Niamey Watershed HydroGeoSphere model

Authors:

GroMoPo Daniel Kretschmer

Owners:

gromopo_admin

Type:

Resource

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The size of this resource is 1.7 KB

Created:

Feb 08, 2023 at 8:25 p.m.

Last updated:

Feb 08, 2023 at 8:25 p.m.

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Abstract

This study investigates groundwater-surface water interactions using an equivalent porous medium approach in a data scarce and semi-arid hydrogeological watershed located south-west Niger. A large scale fully-integrated hydrologic model was built and calibrated using HydroGeoSphere with a sequential approach of increasing levels of temporal resolution: 1) steady state average conditions; 2) dynamic equilibrium with repeating monthly normal forcing data; and 3) fully transient conditions. This approach provided a useful and straightforward method for reducing the calibration effort of the large-scale fully-integrated hydrologic model. River-aquifer exchange flux dynamics, water balance components for different land use classes, as well as basin average groundwater recharge were computed from the model. Simulation results show that exchange flux between groundwater and surface water are Important processes in the basin, with the Niger River acting primarily as a gaining stream, with local losing zones. Ephemeral streams constitute important focused groundwater recharge areas, while ponds exhibit either groundwater discharge behavior, or a recharge zone profile depending on local topography. The basin average water balance highlights the importance of plant transpiration (58% of total rainfall) over surface evaporation (8%), with groundwater recharge of up to 5% of total rainfall. Overland flow and infiltration account for 11% and 16% of the total annual rainfall respectively, and groundwater discharge to the river is 2% of the total rainfall.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:

WGS 84 EPSG:4326

Coordinate Units:

Decimal degrees

Place/Area Name:

Niger

North Latitude

13.7216°

East Longitude

2.5086°

South Latitude

13.2378°

West Longitude

1.7592°

Streets Terrain Satelite

Spatial Extent

Content

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Additional Metadata

Name	Value
DOI	10.1016/j.jafrearsci.2019.103739
Depth
Scale	1 001 - 10 000 kmÂ²
Layers	11
Purpose	Groundwater-surface water interaction
GroMoPo_ID	411
IsVerified	True
Model Code	Hydrogeosphere
Model Link	https://doi.org/10.1016/j.jafrearsci.2019.103739
Model Time
Model Year	2020
Model Authors	Boubacar, AB; Moussa, K; Yalo, N; Berg, SJ; Erler, AR; Hwang, HT; Khader, O; Sudicky, EA
Model Country	Niger
Data Available	Report/paper only
Developer Email	boubacar.a@edu.wascal.org
Dominant Geology	Model focuses on multiple geologic materials
Developer Country	Benin; Niger; Canada
Publication Title	Characterization of groundwater -surface water interactions using high resolution integrated 3D hydrological model in semiarid urban watershed of Niamey, Niger
Original Developer	No
Additional Information
Integration or Coupling	Surface water
Evaluation or Calibration	Dynamic water levels;Meteorology (steady state and transient)
Geologic Data Availability	No

How to Cite

GroMoPo, D. Kretschmer (2023). GroMoPo Metadata for Niamey Watershed HydroGeoSphere model, HydroShare, http://www.hydroshare.org/resource/26da1549b2a0409594ed129a7f28e3d2

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/

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