Materials & Method flow

Study siteBatan estuary, Philippines

Project東南アジア沿岸域におけるエリアケイパビリティ―の向上“Coastal Area Capability Enhancement in Southeast Asia”

総合地球環境学研究所http://www.chikyu.ac.jp/CAPABILITY/

BackgroundSuper typhoon passed to Philippines in Nov. 2013Satellite image can be use detecting damaged areaNormalized Difference Vegetation Index(NDVI) is used to assess ecosystem

ObjectiveEstimate damaged area of mangrove by typhoon passEstimate regenerated area of mangrove after 3 months from typhoonDiscuss about characteristics of vegetation change

Point①：Crowded plantation of Rhizophora mucronata

Point②:Island constructed by natural mangroveSonneratia alba, Avicennia marina, Avicennia rumphiana

↓Some fallen Sonneratia alba still survived↓ Fallen leaves by strong wind

・Damaged area resulted 80ha/429ha・Minimum maximum and average block size of damaged area was

5 m2, 20,217m2 (2 ha) and 68.4 m2 respectively.・It seems north faced mangrove trees were strongly damaged

Result③ Use satellite image (Ⅰ, Ⅲ) and Topographic mapto detect damaged mangrove area by typhoon

↑

Damaged area was detected →

Summary 1/5 of mangrove damaged area can be extracted, but could not

analyze whole study area because of the clouds Overcrowded planting Rhizophora mucronata stands were easily

destroy by strong wind It is suggested that if the tree did not fallen down, mangrove area

recovery fast

Mangrove

Land

Mangrove

Extracted mangrove area

Topographic map(1954) Ⅰ(2012.9.6)

Ⅲ(2014.2.3)Ⅰ(2012.9.6)

衛星画像を用いたフィリピンマングローブ林の台風被害調査報告Assessment of Mangrove Change by Super Typhoon Yolanda in Batan Bay, Panay Island

*Yuya OGAWA, Mamoru KANZAKI(Kyoto Univ.), Kazuo WATANABE(RHIN), Resurreccion B. Sadaba(UP Visayas)

Radiometric and Atmospheric Calibration

QuickBird(Sep. 6, 2012)

WorldView2(Feb. 2, 2014)

1/50,000

Topographic Map(1,954)

Extract land area

Changes detection

WorldView2(Dec. 10, 2013)

Ⅰ Ⅱ Ⅲ

90% of mangrove forests converted to aquaculture ponds since 1988 (Jon Palmos Altamirano, 2010).

There are remaining mangrove stands, abandoned aquaculture ponds, fishing gear in the bay.

Use satellite image (Ⅰ,Ⅱ,Ⅲ) to monitor the damaged area and regenerated area of mangrove in planting mangrove areaResult①

Ⅰ(2012.9.6) Ⅱ(2013.12.10) Ⅲ(2014.2.3)

• There are tree fall in area.

• Fringe of tree stand were survived

• Regeneration of mangrove covered area could be seen in 3 months after the typhoon.

• NDVI was decreased by typhoon but not increase in 3 months after the typhoon.

300m

300m

Use satellite image (Ⅰ,Ⅱ,Ⅲ) to monitor the damaged area andregenerated area of mangrove in natural mangrove areaResult②

Ⅰ(2012.9.6) Ⅱ(2013.12.10) Ⅲ(2014.2.3)

Point③:Large area without clouds in satellite image Ⅰ&Ⅱ

Land Land

300m

A

A

B

BNDVI

NDVI

mangrove soil water

mangrove soil water

Before

After 3 months

After

Eliminate land area

Supervised classification

Detect mangrove area

TyphoonNov. 8, 2013

Grass

Soil

Water

Supervised classification