4.6 Article

Comparative evaluation of spatio-temporal attributes of precipitation and streamflow in Buffalo and Tyume Catchments, Eastern Cape, South Africa

Journal

ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY
Volume 23, Issue 3, Pages 4236-4251

Publisher

SPRINGER
DOI: 10.1007/s10668-020-00769-z

Keywords

Hydro-meteorological data; Sensitivity analysis; Mann-Kendall analysis; Parde coefficient plots; South Africa

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This study analyzed the impact of precipitation variability on streamflow in Tyume and Buffalo catchments using a hybrid statistical approach. The results revealed that the hydrological viability of Buffalo catchment is superior to the conservative attributes of Tyume catchment.
High variability in precipitation has affected streamflow across different catchments especially in semi-arid environments with devastating effects on ecosystem services and functioning. Information on the state of interdependency and spatio-temporal precipitation attributes of the catchments is essential for ecosystem services sustainability especially in the semi-arid environments. A statistical hybrid approach using linearity, stochastic behaviour, and elasticity testing was explored from the 1989 to 2016 datasets for Tyume and Buffalo catchments case studies. To this end, consistency, sensitivity, and trend analysis revealed a spatio-temporal variation between the catchments. For instance, there is consistency in flow double-mass curve. Mann-Kendall test reveals significant increase in winter stream flow trend (Buffalo, Z = 0.328, p value = 0.007; and Tyume, Z = 0.354, p value = 0.004), with a corresponding increase in the Buffalo winter rainfall (Z = 0.354, p value = 0.004). Parde coefficient plots and sensitivity analysis reveal streamflow dependence on rainfall, hydrological response, and spatial difference to climatic variability for Buffalo (epsilon(p) = 0.96) and Tyume (epsilon(p) = 1.89). In general, hydrological viability of Buffalo catchment over the conservative attribute of Tyume catchment is revealed.

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