Geospatial application in Kiribati

Transcription

1 Geospatial application in Kiribati ICC-21 ST RESAP (9 TH TO 13 TH OCTOBER, 2017) BANGKOK, THAILAND Outline Kiribati Profile Natural disasters in Kiribati Achievements Challenges/Issues Ways forward 1

2 Kiribati profile Kiribati Profile Geographical Location: Center of the Pacific Ocean straddling across the equator 33 small island atolls The islands are distributed into 3 groups: Gilbert Group Phoenix Group Line group Population: 110,000 in 2010 National Census The total Land mass is only 811km2 2

3 A closer look into Kiribati Atolls sits on the peak of submerged seamounts Barely 3 meters above sea level Elongated narrow strip of islands Remotely scattered from each other across the Pacific Ocean Natural Disasters in Kiribati A CYCLONE FREE ZONE, but vulnerable to the impact of a few centimeter rise in tide levels caused by storm surges, swells from nearby cyclones and also from strong winds and currents. Such events could cause: acute erosion: Flood or Seawater intrusion: - leading to land losses, - washed away homes, - damage of properties, - community displacements - undermining public infrastructures, - Contamination of freshwater lens - community displacement - salinization affecting food crops - uprooting of coastal plants including food crops. outbreak of diseases Drought Shortage of freshwater supply 3

4 EROSION Erosion maps Erosion maps were developed to inform decision making. Procurement of satellite cost Kiribati about hundreds of thousands of dollars Erosion maps were developed based on only two datasets that are currently available with Government the 1969 historical aerial photos and 2010 or 2011 Geoeye satellite image Due to the expensive datasets, Kiribati is currently unable to continue such programme to give a more present picture of the shoreline 4

5 FLOODING 2.9 meter of sea level Kiritimati island in the Line Group, was hit by an unusual tropical storm system named Pali that developed west of the atoll in early January. The concurrent spring tide, El Niño-induced above average sea level and storm-generated swell produced severe inundation, damaging coastal infrastructure and resulting in tragic loss of lives FLOOD MODELING Flood modeling was impossible to be developed for low lying atolls of Kiribati Lack of digital elevation models for the islands No high resolution satellite imageries that would be able to produce high resolution digital elevation models that would be able to detect the impact of a few centimeter rise in tide level. For Kiribati, space technology and its applications are just unaffordable Cost Effective SOLUTION: SPC GSD and Kiribati conducted a trial exercise on Kiritimati island testing the capabilities of Unmanned Aerial Vehicle in developing digital elevation model, a model that would provide the basis of the extent of flood and its impacts. SPC GSD purchased an equipment to be used for 15 member countries SPC GSD also serves member countries based on a country request The equipment has been useful in post inundation assessments in the Pacific as well 5

6 UAV APPLICATION FOR FLOOD MODELLING High Resolution Digital Surface and elevation mode Risk impact tool Flood modeling issues outcome of the work does not provide a full coastal hazard assessment for the study area as it only looks at extreme water levels without considering wave action. Wave induced inundation is an important factor that would need to be thoroughly considered Government of Kiribati is eager to work with SPC to raise funds in order to carry out the second phase of the project which could consist of: - collecting bathymetry data - modelling the impact of wave and finalizing inundation hazard maps - Finalizing PacSAFE - Training relevant stakeholder on the use of PacSafe 6

7 Seismic activities in Kiribati From December 1981 to March 1983, an earthquake swarm commenced at a location 150 km southeast of Arorae island, the southeasternmost of the Gilbert Island. The swarm produced 217 earthquakes The report stated that it is one of the most unusual intraplate events recorded On the 20 th of April, 2016, Fiji detected seismic activity in Kiribati Waters with a magnitude of 5.2. Location: 0.63 S long: E, Depth is 200km A 5.2 MAGNITUDE earthquake was detected again in the Kiribati region on the 13 th of September 2017 A 4.6-magnitude earthquake was detected in the Line Group at 02:46:24 / 2:46 am (local time epicenter). Exact time and date of earthquake 01/08/16 / :46:24 / August 1, 1:46 pm UTC/GMT. Exact location of event, longitude West, latitude South, depth = 10 km. Concerns about earthquakes and Tsunami impacts Fortunately, the earthquakes were weak to produce tsunami Lack of monitoring systems and currently depended on other Pacific Island Country s equipments Kiribati is now concerned about earthquakes and tsunami impacts because there is no higher grounds for evacuation on the island, Lack of capacity in seismology and tsunamis risk assessments 7

8 RESAP action plan To provide mechanism for institutional strengthening on the application of SPACE technology particularly to countries like Kiribati. To provide funding to support national and regional geospatial projects to enhance the country s preparedness, responses and resilience to disaster risks and climate change impacts Data sharing mechanism and promote the use of open source softwares and databases Recognize the special cases of small island states in Space technology Ensure all member states including the Pacific Countries have flood simulations including early warning systems bridge the gaps of isolation and remoteness issues of islands in the Pacific, Increase engagement and participation of member countries including the Pacific island Countries - Leaving no one behind in