WB3: Risk Management

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Mountain <strong>Risk</strong>sResearch Training Network2. Landslide MonitoringE. Current And Future TasksINVESTIGATE time of failure using the inverse velocity method in theCROWN ZONE (test it in other parts as well) (Saito, 1965; Fukuzono, 1985;Voight, 1988)(From Fukuzono, 19Definition of thevelocity thresholdsusing the monitoringdata collected insitu(example: Crosta &MOUNTAIN RISKS: Mid-term Meeting, Diablerets, 26-27 June 2009
2E Landslide Monitoring – Current and Future TasksINVESTIGATE relationship velocity & slope angle / slide surface (during thereactive and active phase)Mountain <strong>Risk</strong>sResearch Training NetworkINVESTIGATE relationship velocity & rainfall intensity / cumulated rainfall(during the reactive and active phase)1. DISPLACEMENT and VELOCITY patterns2. RAINFALL vs. MOVEMENTS relationships3. MECHANICAL EFFECTSLocationLocationCROWN zoneSOURCE areaTRACK zone: Right FlowTRACK zone: Main FlowTimeSUMMER:FALL/WINTER:SOURCE Area and Track Zone: RightFlowTRACK Zone: Main FlowPatternslow continuous movements: (10 -3 m/hour) with 4-5 daysacceleration/deceleration phases (1 x 10 -2 to 0.5x10 -1 m/hour)slow intermittent movements (10 -3 m/hour) with 4-5 daysacceleration phase (1-2 x10 -2 to 0.8 m/hour) and 4-5 daysdeceleration phaseslow to intermittent movements (10 -3 m/hour) with 1-2 daysacceleration phase progressive down-slope (0.5-0.8 x 10 -2 m/hour)and 15-30 days deceleration phaseslow continuous movements (10 -3 m/hour) with 5-6 days accelerationphase progressive down-slope (0.5 x 10 -2 m/hour) and 30-60 daysdeceleration phaseObserved Relationships15-30 days delay between rainfall event and maximum velocityphase3 to 5 days delay between rainfall event and maximum velocityphasePatterns2-3 days average time-gap between acceleration phasespossible down-slope mass transfer51MOUNTAIN RISKS: Mid-term Meeting, Diablerets, 26-27 June 2009
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