Publication

River ?ood risk in Jakarta under scenarios of future change


Publication Date : 2015-07-30
Author : Aerts, J. C.Ward, P. J.
Countries :
Disaster Management Theme :
Disaster Type : Flood
Document Type : Research Paper
Languange : en
Link : http://www.indiaenvironmentportal.org.in/files/file/flooding%20in%20Jakarta.pdf

Abstact :

Given the increasing impacts of ?ooding in Jakarta, methods for assessing current and future ?ood risk are required. In this paper, we use the Damagescanner-Jakarta risk model to project changes in future river ?ood risk under scenarios of climate change, land subsidence, and land use change. We estimate current ?ood risk at USD1435 million p.a. Combining all future scenarios, we simulate a median increase in risk of +263% by 2030. The single driver with the largest contribution to that increase is land subsidence (+173%). We simulated the impacts of climate change by combining two scenario of sea level rise with simulations of changes in 1day extreme precipitation totals from 5 Global Climate Models (GCMs) forced by 4 Representative Concentration10 Pathways (RCPs). The results are highly uncertain; the median change in risk due to climate change alone by 2030 is a decrease by -4%, but we simulate an increase in risk under 21 of the 40 GCM-RCP-sea level rise combinations. Hence, we developed probabilistic risk scenarios to account for this uncertainty. Finally, we discuss the relevance of the results for ?ood risk management in Jakarta