Improved Hydrological Understanding of a Semi-Arid Subtropical Transboundary Basin Using Multiple Techniques – The Incomati River Basin

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This study aims at improving the hydrological process understanding of the semi-arid and transboundary Incomati river basin to enable better water management. Comprehensive statistical and trend analysis of rainfall and streamflow were conducted, and the Indicators of Hydrological Alteration tool was deployed to describe the streamflow regime and trends over time. Land use and land cover change, particularly the conversion of natural vegetation into forest plantation, the expansion of irrigated agriculture and the flow regulation due to dam operation were identified as critical drivers of flow regime alteration. Hydrograph separation using long-term hydrochemical data at seasonal scale, and hydrochemical and isotope data at event scale were performed to quantify runoff components. A novel methodology to calibrate recursive digital filters using routinely collected water quality data was developed and tested in the catchment. This method allows for estimation of daily baseflow from readily available daily streamflow data. Dominant runoff generation zones were mapped using the Height Above Nearest Drainage approach. The hydrological model STREAM was then employed, informed by the runoff generation zones mapping and the process understanding gained in the catchment, as well as remote sensing data. The study provides the basis for better operational water management in the catchment.

Table of contents

Cover
Half Title
Title Page
Copyright Page
ACKNOWLEDGMENTS
SUMMARY
SAMENVATTING
Table of Contents
1 GENERAL INTRODUCTION
2 DESCRIPTION OF THE STUDY AREA
3 DRIVERS OF SPATIAL AND TEMPORAL VARIABILITY OF STREAMFLOW IN THE INCOMATI RIVER BASIN
4 ISOTOPIC AND HYDROCHEMICAL RIVER PROFILE OF INCOMATI RIVER BASIN
5 HYDROGRAPH SEPARATION USING TRACERS AND DIGITAL FILTERS TO QUANTIFY RUNOFF COMPONENTS
6 UNDERSTANDING RUNOFF PROCESSES IN A SEMI-ARID ENVIRONMENT THROUGH ISOTOPE AND HYDROCHEMICAL HYDROGRAPH SEPARATIONS
7 HYDROLOGICAL MODELLING OF THE KAAP CATCHMENT
8 CONCLUSIONS AND RECOMMENDATIONS
9 REFERENCES
APPENDICES
ACRONYMS
BIOGRAPHY
LIST OF PUBLICATIONS


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