Determining the Surface Water Exchange between the Kafue River and Lukanga Swamps in the Central Province of Zambia

Alick R Mwanza^1, , Edwin Nyirenda² and Wilma S Nchito³

¹Department of Geomatic Engineering, University of Zambia, Lusaka, Zambia

²Department of Civil and Environmental Engineering, University of Zambia, Lusaka, Zambia

³Department of Geography and Environmental Studies, University of Zambia, Lusaka, Zambia

Cite this paper

Alick R Mwanza, Edwin Nyirenda and Wilma S Nchito. Determining the Surface Water Exchange between the Kafue River and Lukanga Swamps in the Central Province of Zambia. Journal of Geosciences and Geomatics. 2019; 7(3):145-156. doi: 10.12691/JGG-7-3-5

Abstract

The Lukanga swamps are a part of the Kafue River catchment. It lies about 30km to the east of the Kafue River. It is connected to the Kafue River mainly through the Munwinu and Lukanga channels and during peak floods some waters of the Kafue River are said to back into the Lukanga swamps. This study thus modelled the surface water exchange between the Kafue River and the Lukanga swamps in order to understand the surface flow interactions between the Kafue River and the Lukanga swamps. The modelling employed graph theory through which the water system was recognised as a graph of 3 nodes and 3 edges. Historical water levels observed over a period of 81 months were used as input variables whereas elevations obtained from channel profiles from a corrected SRTM DEM were used as the input constants. The elevations represented channel floor. The results showed that there were 56 months in which the network had flow in all the edges, that the Lukanga channel flowed throughout the year from the Lukanga swamps to the Kafue River and that the Munwinu channel only flowed from the Kafue River to the Lukanga swamps whenever there was flow. Thus the Munwinu channel as well as the Lukanga channel does not present bidirectional flow at all.

Keywords

graph theory, Lukanga swamps, Kafue River, surface water exchange, surface water modelling

Copyright

This work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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