Jakarta dams and walls

Jakarta dams and walls

Dijkshoorn, G.W.
Dupuits, E.J.C.
Nieuwboer, B.J.
Zwanenburg, S.A.A.

Civil Engineering and Geosciences

Hydraulic Engineering

2010-11-19

After giving a short general introduction on the area and the general problems in that area, this report starts with an extensive list of relevant boundary conditions for the Jabodetabek area in chapter 2. The most notable parts of this chapter are the large subsidence for Jakarta and the river discharges in the Jabodetabek area. While still operating on a macro level, bottleneck maps for the situ-situ and sea defense were made in chapter 3. These were inventoried using fieldwork and previous studies. The results of this inventory are three bottleneck maps for the situ-situ with the location of the situ-situ together with a value of damage potential, failure potential or risk of the dam. This approach was not taken for the sea defense due to an utter lack of data. A part of the missing information is gathered by field trips, but not enough to make similar quantifications as for the situ-situ. Instead, a bottleneck map for the sea defense was made based on the visual inspection itself. These bottleneck maps are not meant to give a list of all bottlenecks in the entire Jabodetabek area; merely a list of bottlenecks with a high risk. Locations with a high risk are the most promising locations that could qualify for monitoring and emergency solutions. Before the applicability of monitoring and emergency solutions in the Jabodetabek area can be assessed, an overview of relevant failure mechanisms is given in chapter 4 for both the situ-situ and the sea defense. Likewise, an overview of available monitoring sensors and emergency measures is given in chapter 5 and 6 respectively. This information all comes together in chapter 7. A selection of monitoring sensors is made for selected bottlenecks (from chapter 3) based on the conditions in Jakarta (chapter 2). These conditions and bottlenecks define which failure mechanisms (chapter 4) are dominant for the selected bottlenecks, and which monitoring sensors (chapter 5) are applicable. The dominant failure mechanisms together with the local conditions also determine which emergency measure should be used. There is a strong coupling between monitoring sensor, failure mechanism and emergency measure. The dominant failure mechanism determines which monitoring sensor should be used, and the failure mechanism together with the monitoring sensor determine the warning time. The warning time and dominant failure mechanism determine which emergency measure could be used. Finally, a pre-feasibility of the emergency measures and monitoring sensors is given, compared to conventional, completely new designs. The recommended monitoring sensors and emergency measures are put to the test in chapter 8 and 9 for respectively a situ dam design and a sea defense design. Both these chapters contain an application of monitoring sensors and emergency measures for an existing and a fictional, new design.

Jakarta
flood risk
urban flooding
flood drains

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