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Ratna sari dewi The National Coordinating Agency for Survey and Mapping. Incorporating network analyst to determine evacuation route for tsunami. Asian Geospasial Forum, 17-19 October 2011 –Mulia Senayan Hotel – Jakarta, Indonesia. OUTLINES. Objective Background Method

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incorporating network analyst to determine evacuation route for tsunami
Ratna sari dewi

The National Coordinating Agency for Survey and Mapping

Incorporating network analyst to determine evacuation route for tsunami

Asian Geospasial Forum, 17-19 October 2011 –Mulia Senayan Hotel – Jakarta, Indonesia

outlines
OUTLINES
  • Objective
  • Background
  • Method
  • Results and Discussions
  • Conclusions
objective
OBJECTIVE
  • To develop a methodology to choose the most effective evacuation routes using GIS tools in a tsunami-prone area

Network Analyst

background 1
BACKGROUND (1)
  • Tsunami is very destructive, cause a huge number of fatalities, damages, and cause considerable economic and business losses.
  • The destruction due to tsunami impact is various depending on the source, the distance from the epicenter and also the intensity of the trigger factors which cause tsunami.

http://3.bp.blogspot.com/_E-QOnTGFX_o/RyC4LWX3x9I/AAAAAAAACC4/pBwbjAXEERk/s320/tsunami.jpg

background 2
BACKGROUND (2)

Factories

Power Plant

Agricultural Area

Oil company refinary

Residential Areas

Shipping Port

Sea Port

why need evacuation plan?

Oil company refinary

background 3
BACKGROUND (3)
  • Tsunami mitigation plan  evacuation plays a crucial measure for saving human live.
  • To determine the best evacuation route from a given point we have to identify the fastest path from that point to the assembly point.
  • This fastest path is not always the shortest path.
methods 3 network datasets
METHODS (3)… Network Datasets
  • Evacuation route is created by using Network Analyst.
  • Criteria for developing network Datasets:
    • Travel Impedance: represents the cost of travelling  distance, time, fuel consumption, cost, etc
    • Restriction : the network datasets have rules about how objects travel through them  set directions called one-way or two-way streets
    • Evacuation Time : can identify challenges to efficient evacuation which allows mitigation measures to be pre-planned.
methods 4 network datasets
METHODS (4)… Network Datasets

Evacuee walking speed

Knoblauch (1996) stated that walking rates are influenced by a variety of factor including the width of the roads, road density, the number of pedestrians in a group, etc. For this research due to the time constraint in conducting the research, the speed of walking in a particular road was only influenced by the walking speed of evacuees and the width of the roads.

methods 5 evacuation time

Time allocated for tsunami evacuation

Source : Charnkol and Tanaboriboon (2006), Post et. al. (2009), Widyaningrum (2009)

METHODS (5)… Evacuation Time

10 minutes was taken as time needed for people to react

22 minutes for people to go to shelter buildings. Regarding evacuation process,

22 minute-evacuation time was split into 17 minutes travelling on the network to shelter building and

5 minutes climbing up to the upper floor

results 1
RESULTS (1)

Purpose:

To assess the appropriate of buildings as evacuation shelter

Several criteria to assess the buildings were the number of floors, design, construction, alternate function and the location of the buildings.

Building use MAP

results 2
RESULTS (2)

Building Estimation for Shelter

results 3
RESULTS (3)

Night

Day

Population Estimation

results 31
RESULTS (3)

Topographic Map

Improved Data

Road Network

results 4 shelter buildings
RESULTS (4).. Shelter buildings

What factor should be considered ??

conclusions
CONCLUSIONS
  • The realistic model is determined by the detailed input data.
  • Different scenarios of population over the day will result in different allocation of ESB.
  • GIS software (ArcGIS including Network Analyst) is proved to be powerful in conducting evacuation model.
slide20

The tsunami warning should be issued within 5 minutes after the earthquake to the authorities, media, and communities at regional level.

  • Meanwhile at national level, tsunami warning should be disseminated 10 minutes after the earthquake.
  • Then, the system is waiting for the confirmation of the sea level monitoring from tide gauge or buoy station. When tsunami occurrence is confirmed by sea level monitoring, then the tsunami warning dissemination will be confirmed as well. On the contrary, if the sea level does not confirmed, the cancellation of the tsunami warning should be issued.
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