Dynamic Landslide Warning from Rainfall and Soil Suction Measurement

Landslides due to heavy rainfall are remarkably increased during the last decade. Past recordshows that Thailand had lost in average 15 lives and 105 mbaht annually. The method of prediction and warning can be efficiently analyzed by geotechnical engineering method. The soil sampling and testing of unsaturated characteristics such as SWCC, permeability function, Fredlund’s strength model etc. had to be carefully done. Infiltration model during the rain can be predicted and verified by the field observation. Prediction of stability and probability of failure on the target area was applied the GIS and database to obtain the real-time result and presentation on the map. The merit of the model is that when the rainfall data was input continuously to the model the potential landslide area can be shown almost real time after quick calculation. Triggered rain fall chart of 24 hrs triggered and 3 days pre-wetted rainfall can also pre-analyzed in advance for manually warning for specific area without computer system. The case study at Pathong Bay area, Phuket is given as the example for the prediction.