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Sustainability 2017, 9(4), 619; doi:10.3390/su9040619

Effectiveness and Limitation of Coastal Dykes in Jakarta: The Need for Prioritizing Actions against Land Subsidence

1
School of Environment and Society, Tokyo Institute of Technology, Tokyo 152-8550, Japan
2
Graduate School of Frontier Sciences, University of Tokyo, Chiba 277-8563, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Tan Yigitcanlar
Received: 22 February 2017 / Revised: 7 April 2017 / Accepted: 14 April 2017 / Published: 16 April 2017
(This article belongs to the Section Sustainable Urban and Rural Development)
View Full-Text   |   Download PDF [5720 KB, uploaded 18 April 2017]   |  

Abstract

Jakarta has been experiencing severe land subsidence over the last few decades. A questionnaire survey of local inhabitants revealed that seawater is already overtopping coastal dykes and flooding a vulnerable community along Jakarta’s waterfront. The present study projects coastal floods around Jakarta until the year 2050 to understand the long term effectiveness of proposed dykes under continuing rapid land subsidence scenarios. This is done through a hydrodynamic model that considers land subsidence, sea-level rise, and tides. The analysis confirms that, if high enough, coastal dykes will help to prevent flooding, though their effectiveness will eventually disappear as land subsidence continues. For example, a 3-m dyke, which is expected to be sufficiently high to cope with present-day conditions, could completely lose its ability to stop floods by the year 2040. Moreover, higher dykes can also bring about other problems, because if they are overtopped, they actually prolong flooding, essentially trapping a higher volume of water inland. On the other hand, a small 1-m dyke can be expected to stop coastal floods if land subsidence can be stopped. This study demonstrates that actions to stop land subsidence would be the most effective countermeasure to mitigate coastal floods from the middle of the 21st century onwards, emphasizing the need to prioritize such actions among the range of countermeasures being proposed for Jakarta. View Full-Text
Keywords: Jakarta; land subsidence; sea-level rise; coastal flood projection; coastal dykes; questionnaire survey; pumping stations Jakarta; land subsidence; sea-level rise; coastal flood projection; coastal dykes; questionnaire survey; pumping stations
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Takagi, H.; Fujii, D.; Esteban, M.; Yi, X. Effectiveness and Limitation of Coastal Dykes in Jakarta: The Need for Prioritizing Actions against Land Subsidence. Sustainability 2017, 9, 619.

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