 |
| Titel |
Precise ground motion measurements to support multi-hazard analysis in Jakarta |
| VerfasserIn |
Fifame Koudogbo, Javier Duro, Javier Garcia Robles, Hasanuddin Z. Abidin |
| Konferenz |
EGU General Assembly 2015
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250113924
|
| Publikation (Nr.) |
 EGU/EGU2015-14973.pdf |
|
|
|
|
|
| Zusammenfassung |
| Jakarta is the capital of Indonesia and is home to approximately 10 million people on the
coast of the Java Sea. The Capital District of Jakarta (DKI) sits in the lowest lying areas of
the basin. Its topography varies, with the northern part just meters above current sea
level and lying on a flood plain. Subsequently, this portion of the city frequently
floods.
Flood events have been increasing in severity during the past decade. The February 2007
event inundated 235 Km2 (about 36%) of the city, by up to seven meters in some areas. This
event affected more than 2.6 million people; the estimated financial and economic losses from
this event amounted to US$900 million [1][2]. Inundations continue to occur under
any sustained rainfall conditions. Flood events in Jakarta are expected to become
more frequent in coming years, with a shift from previously slow natural processes
with low frequency to a high frequency process resulting in severe socio-economic
damage.
Land subsidence in Jakarta results in increased vulnerability to flooding due to the
reduced gravitational capacity to channel storm flows to the sea and an increased risk of tidal
flooding. It continues at increasingly alarming rates, principally caused by intensive deep
groundwater abstraction [3]. Recent studies have found typical subsidence rates of 7.5-10 cm
a year. In localized areas of north Jakarta subsidence in the range 15-25 cm a year is
occurring which, if sustained, would result in them sinking to 4-5 m below sea level by 2025
[3].
ALTAMIRA INFORMATION, company specialized in ground motion monitoring,
has developed GlobalSARTM, which combines several processing techniques and
algorithms based on InSAR technology, to achieve ground motion measurements with
millimetric precision and high accuracy [4]. Within the RASOR (Rapid Analysis
and Spatialisation and Of Risk) project, ALTAMIRA INFORMATION will apply
GlobalSARTM to assess recent land subsidence in Jakarta, based on the processing of Very
High Resolution COSMO-SkyMed data acquired from the second semester 2014.
Those recent measurements will be analyzed and compared with results obtained
previously within the ESA /World Bank EOWorld initiative [4]. An updated status of the
situation in Jakarta will be derived of this analysis; this information will serve within
RASOR for the assessment of future risk which is valuable for planning of flood
protection.
[1] “News and Broadcast: Jakarta Urgent Flood Mitigation Project/Jakarta Emergency
Dredging Initiative Project (JUFMP/JEDI Project)”,
http://web.worldbank.org/WBSITE/EXTERNAL/NEWS/.
[2]http://www.who.int/hac/crises/idn/sitreps/indonesia_floods_map_affected_areas_5feb2007.pdf.
[3] Abidin, H. Z., Andreas, H., Gumilar, I., Gamal, M., Fukuda, Y. and Deguchi, T.,
“Land Subsidence and Urban Development in Jakarta (Indonesia)”, Proceedings of 7th FIG
Regional Conference Spatial Data Serving People: Land Governance and the Environment –
Building the Capacity (2009).
[4] European Space Agency and World Bank, Earth Observation for sustainable
Development, Partnership report (2013). |
|
|
|
|
|
|