University of Twente Student Theses


Analysing land use change effects on discharge of the Pawan River

Marco Trishan Wilando, M. (2023) Analysing land use change effects on discharge of the Pawan River.

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Abstract:Introduction and Research Context: Indonesia regularly experiences floods due to numerous factors. Ketapang, West Kalimantan is an area that is significantly exposed to flood risk. AidEnvironment staff members who resided in the study area experienced a flood disaster that devastated their homes. With the support of the government of Ketapang, AidEnvironment is tasked to figure out methods to mitigate floods in Ketapang. They reached out to Witteveen+Bos who prompted the beginning of this Bachelor thesis project. The Ketapang region has a large catchment area called the Pawan Catchment. This catchment area collects rainfall water that flows into the Pawan River. The catchment area is observed to have experienced significant land use changes from forests to palm oil plantations. Currently, the land use of the catchment is dominated by palm oil plantations. Research Objective: The goal of this thesis project is to discover how land use has changed in the Pawan catchment and to understand the effects of land use change on the discharge of the Pawan River. Then, the study aims to identify an intervention that can be implemented on Ketapang through a qualitative and quantitative analysis. Methodology: The methodology of this study contains two types of analyses, qualitative and quantitative analysis. The quantitative analysis utilized a hydrological model called Wflow. Meanwhile, the qualitative analysis underwent a site visit to Ketapang, where unstructured interviews with stakeholders took place. The site visit was intended for data collection that was necessary for model validation. Conclusion: This study shows how plantation areas increased drastically from 1990-2020. Discharge has also increased in correlation to plantation areas. Therefore, the intervention scenario was a reforestation strategy. It was found that when reforested, discharge was decreased, although the results were relatively small. This coincides with the increase in discharge due to plantation areas, which were also relatively small. Recommendation: Discharge measurements gathered from the Ketapang government was insufficient to calibrate and validate the model. This could explain why the change in discharge was relatively small, as the Wflow may not simulate Ketapang conditions to an accurate degree. Therefore, for future use of the model, it should be calibrated and validated, provided data is available. For a more effective mitigation strategy, several interventions must be implemented. The use of a hydraulic model may be suitable to test different interventions directed to the Pawan River. In combination with land use interventions, the effect may be compounded and be more apparent in the analysis.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Programme:Civil Engineering BSc (56952)
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