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Author
Zefanias Nhassengo, Osvaldo Silva Escola Superior de Neg´ocios e Empreendedorismo de Chibuto, Universidade Eduardo Mondlane
Somura, Hiroaki Graduate School of Environmental and Life Science, Okayama University
Wolfe, June III Texas A&M AgriLife, Blackland Research & Extension Center
Abstract
Study region: This study focuses on the Lower Limpopo River basin (LLRB) in Mozambique, Africa. Study focus: Maintaining environmental flows necessary for ecosystem sustainability represents a significant challenge to water resource management. In this study the sustainability of LLRB was evaluated by comparing hydrologic availability with ecological and anthropogenic needs. Current river ecological status was scored with a habitat integrity index verified through ground-truthing field surveys and aerial imagery data. Local stakeholder interviews were used to further evaluate the habitat index scores. Deficiencies between water availability and ecological-human requirements were assessed with a water scarcity index.
New Hydrological Insights for the Region: Four environmental flow categories defined as "Excellent", "Fair", "Poor", and "Degraded" coincided to approximately 50 %, 39 %, 27 %, and 14 % of the natural mean annual flow, respectively. Stakeholder interview responses indicated annual water shortages currently occur between August and November and coincide with "Poor" and "Degraded" environmental flow conditions. Water supplies appear to meet consumption needs when calculated on an annual basis with the water scarcity index. However, when calculated monthly, there is not enough to meet human water demand between August and October. This deficit period will likely expand from June to November due to projected increases in future water demands. As the greatest water use in the basin is agricultural irrigation, long-term environmental flows sustainability will likely depend upon effective irrigation management.
Keywords
Ecosystem sustainability
Environmental flow requirement
Small scale irrigation
Water demand
Water scarcity
Published Date
2021-08
Publication Title
Journal Of Hydrology-Regional Studies
Volume
volume36
Publisher
Elsevier
Start Page
100843
ISSN
2214-5818
Content Type
Journal Article
language
English
OAI-PMH Set
岡山大学
File Version
publisher
DOI
Web of Science KeyUT
License
http://creativecommons.org/licenses/by-nc-nd/4.0/
Funder Name
Japan International Cooperation Agency
Open Access (Publisher)
OA