Demand for land and water for agriculture, urbanization, irrigation, hydropower, and industrialization is increasing to meet the demands of growing populations and of growing economies. However, changes in land and water resources are often studied separately. A better representation of the interaction between land-use change and its drivers on the one hand and water resources on the other is imperative for sustainable environmental management.
This research investigates and develops spatial analysis methods and tools for the quantification of dynamic feedbacks between land-use change and water resources, by focusing on case study catchments in Ethiopia and South Africa. Furthermore, the research investigates methods for analysing land-use suitability and modelling land-use change. Results show that major changes in land-use have been observed in the past two to three decades in the study catchments. Model representation of the interaction between land-use change and water resources shows that changes in land-use influence hydrologic responses. These influences are especially pronounced during high- and low-flow seasons. Likewise, hydrologic processes and water resources availability influence land-use suitability and hence land-use change responses. Accounting for the dynamic feedback between land-use and hydrology thus produces improved knowledge that can better inform integrated natural resources management.
1.2 Integrated Assessment Modeling
1.3 Study Areas
1.4 Problem Descriptions
1.5 Research Objectives
1.7 Structure of the thesis
Part I: Land‐Use Change Modeling
2 Land suitability assessment in the Abbay basin
2.2 Study Area
2.3 Materials and Methods
2.6 Conclusion and recommendations
3 A web‐based framework for land‐use suitability assessment
3.2 Data and Methods
3.3 Results and discussion
4 Land‐use change modeling for the Abbay basin
4.2 Materials and methods
4.3 Results and Discussions
4.4 Conclusion and Recommendations
Part II: Feedback Between Land Use and Hydrology
5 Modelling hydrologic impacts of semi‐dynamic land use in the Jedeb
5.2 Existing literature: state‐of‐the‐art
5.3 Materials and methods
5.4 Results and Discussion
6 Feedback between coupled land‐use and hydrologic models
6.2 Study Area
6.3 Materials and Methods
7 Conclusions and Recommendations
Appendix 1. WFlow model parameters
Appendix 2. Scenario simulation
Appendix 3. SWIM‐SITE Coupling: code snippets
Appendix 4. Land‐cover classification on GEE:code snapshot
IHE Delft PhD programme leads to a deepening of a field of specialisation. PhD fellows do scientific research, often with conclusions that directly influence their region. At IHE Delft, PhD researchers from around the world participate in problem-focused and solution-oriented research on development issues, resulting in an inspiring research environment. PhD fellows work together with other researchers from many countries dealing with topics related to water and the environment.
PhD research is often carried out in the ‘sandwich’ model. Preparation and final reporting – the first and last portion of the programme – are carried out in Delft, while actual research is done in the fellow’s home country, under co-supervision of a local institute. Regular contacts with the promotor are maintained through visits and long-distance communication. This enables researchers to employ solutions directly to problems in their geographical region.
IHE Delft PhD degrees are awarded jointly with a university. The degrees are highly valued and fully recognised in all parts of the world.