Resolving Uncertainties in the Source of Low Flows in South African Rivers Using Conceptual and Modelling Studies

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Edition
Call Number 556.324 ABE c
ISBN/ISSN 9781907161209
Author(s) Hughes, Denis A.
Kapangaziwiri, Evison
Tanner, Jane
Slaughter, Andrew
Subject(s) wetlands
Surface-groundwater
Low flows
Hydrological modelling
Classification 556.324
Series Title Conceptual and Modelling Studies of Integrated Groundwater, Surface Water, and Ecological Systems
GMD Buku_Teks
Language English
Publisher IAHS Press
Publishing Year 2011
Publishing Place Oxford
Collation Hlm. 127-132
Abstract/Notes Low flows play an important role in the eco-hydrology of any natural system and within South Africa are mainly derived from near-surface interflow or deeper groundwater processes. In South Africa there is much uncertainty about the dominant source of low flows in any specific basin. Understanding surface-groundwater interactions and determining the source of low flows are important for sustainable water management strategies and the integrated exploitation of ground and surface water resources; a critical issue for water-stressed regions. This study uses a monthly rainfall-runoff model that includes surface-groundwater interactions in which low flow responses can be simulated either as interflow or groundwater discharges to the river (or both). If the model is to provide useful information for integrated water management any uncertainties in the simulated source of low flows need to be resolved. The paper explores different approaches to resolving these uncertainties (using limited water quantity and quality data) in three basins where the surface-groundwater interaction processes are assumed to be different.
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