PVMBG, BNPB. Rainfall data : TRMM 3B42. (spatial resolution 0.25º x. 0.25º) http://mirador.gsfc.nasa.g · ov/. Slope Data: DEM SRTM. (spatial resolution : 90 m).
The Determination of Rainfall Threshold Triggering Landslide in West Java Using TRMM Satellite Data
Fauziah, S.N., Muttaqin, I., Suwarman, R., Sadisun, I. Meteorology Study Program, Faculty of Earth Sciences and Technology Institut Teknologi Bandung, 2015.
Introduction Methodology
Result and Discussion Limitation and Recommendation
Conclusion
Background Rainfall is a recognized trigger of landslides (Guzzetti et al., 2007) West Java is an area with - high vulnerability of landslides (PVMBG) - many hills with a steep slope (Kartiko et al., 2006)
Fig1. Fig2. Landslide ThresholdSucceptibility by Hong (red Map line)and Threshold by Caine (http://sains.kompas.com, (blue line). (Hong, 2007) 2014)
Rainfall Threshold is an important information for development of early warning system. Threshold of Hong (2006) has made a threshold globally, and need to be evaluated and developed in West Java. Satellite Remote Sensing Information (TRMM, SRTM, etc.) may be the best source for the vast majority Earth Surface (Hong, 2007)
Introduction
• The aim of this study is to determine rainfall threshold value in West Java by using TRMM and analyze the relation with the angle of slope.
Threshold
Physical base Empirical base
Fig4. Comparison of the landslide-triggering rainfall intensity– duration thresholds from various studies. (Hasegawa, 2008) Fig3. study area (West Java) with landslide data event from 2006 until 2013.
Start Landslide Data
Rainfall Data
Data Slope Data
Compile
I N
Scatter Rainfall I-D
Filtering Data Plot Threshold Curve
Nilai Threshold Curah Hujan TRMM Jawa Barat Analisis Fig.5 ID (Intensity-Duration) Data Selesai (Guzzetti, 2007)
P U T
Landslide data : PVMBG, BNPB Rainfall data : TRMM 3B42 (spatial resolution 0.25º x 0.25º) http://mirador.gsfc.nasa.g ov/ Slope Data: DEM SRTM (spatial resolution : 90 m) srtm.csi.cgiar.org
Start Landslide Data
Rainfall Data
Slope Data
Compile
F I L T E R I N G
Coordinate Error Double data rainless Extreme Data
Scatter Rainfall I-D
Filtering Data Plot Threshold Curve
Nilai Threshold Curah Hujan TRMM Jawa Barat Analisis
Selesai
Result: Landslides triggered by rain
General Threshold Equation
Start Landslide Data
Rainfall Data
Slope Data
Compile
I=c+α
-ß D
I =intensity D = duration α, β, c, parameter
Scatter Rainfall I-D
Filtering Data Plot Threshold Curve
The value of West Java Rainfall Threshold
Analysis
Finish
Fig6. Threshold Curve below I-D data which result landslide(Guzzetti, 2007)
Result and Discussion Fitering Result
4% Salah koordinat Undefined coordinate
27%
Double Double Data
35%
Double_slope Double Slope Data Tidak hujan Rainless Slope
