Flood risk in the Ciliwung catchment (thesis research proposal)
People living in delta cities always have to be prepared for certain threats directly or indirectly caused by the forces or use of water. The Indonesian capital, Jakarta, is an example of a mega delta city which is frequently suffering from typical disasters in a river delta, such as coastal flooding and riverine flooding. Sea level rise in combination with an increasing subsidence rate, due to extensive groundwater extraction threatens neighbourhoods close to the coastline every day. Riverine flooding is a yearly threat for the city in the wet season as high intensity tropical rain showers can result in peak discharges in a short time period via the numerous rivers crossing Jakarta, originating from mountainous upstream areas. Recent devastating riverine floods, resulting in big economic damage and casualties, occurred in 2002, 2007, 2013, 2014 and 2015. Due to ongoing deforestation and change of land use in the upstream part of the catchments of these rivers the storage capacity is decreasing. As a consequence, the amount of direct runoff increases after a heavy rainfall event and the attenuation of peak discharge is decreasing, thereby increasing the risk of floods in the densely populated downstream parts of the catchment.
Research goals and questions
Wednesday 06 June 2018