Monitoring system for deep-seated landslides using locally-developed tilt and moisture sensors: System improvements and experiences from real world deployment

Landslides pose serious threat in a large number of communities living near steep and unstable slopes in the Philippines. This paper describes the enhancements in the design of an alternative instrumentation for monitoring deep-seated landslides based on tilt and soil moisture sensors. The real time landslide monitoring system is composed of a sensor column buried in a borehole, which can reach up to 40m in depth, in the unstable slope. Each column consists of 0.5-1m segments that contain a tri-axial accelerometer for tilt measurements and a capacitive sensor for soil moisture. In this manner, tilt and soil moisture measurements can be made at a resolution of 0.5 to 1m underground. Sensor measurements from each segment are accessed via Controller Area Network (CAN) protocol and transmitted to a remote host via GSM cellular infrastructure. We also describe the previous deployments in ten different sites in the Philippines as well as share the technical challenges and difficulties faced in deploying the monitoring system in real world setting. The field deployments provided valuable inputs regarding improvements in the sensor design. Furthermore, this paper discusses the experiences in involving the community at risk as part of the synergistic approach in taking progressive steps towards an effective community and technology based early warning system.

[1]  Giovanni Gullà,et al.  Landslide triggering scenarios in homogeneous geological contexts: The area surrounding Acri (Calabria, Italy) , 2007 .

[2]  M. Terlien.  The determination of statistical and deterministic hydrological landslide-triggering thresholds , 1998 .

[3]  Rolando P. Orense,et al.  Slope Failures Triggered by Heavy Rainfall , 2004 .

[4]  Dwikorita Karnawati,et al.  Landslide hazard and community-based risk reduction effort in Karanganyar and the surrounding area, central Java, Indonesia , 2011 .

[5]  Sri Lanka.  Mitigation and Redevelopment as a Sustainable Development Strategy for Disaster Prone Human Settlements: With special reference to Landslide at Peradeniya Town , 2012 .

[6]  Joel S. Marciano,et al.  Real-World Deployment of a Locally-Developed Tilt and Moisture Sensor for Landslide Monitoring in the Philippines , 2011, 2011 IEEE Global Humanitarian Technology Conference.

[7]  Siegfred D. Balon,et al.  Implementation and characterization of a reconfigurable time domain reflectometry system , 2013, 2013 IEEE International Conference on Smart Instrumentation, Measurement and Applications (ICSIMA).

[8]  J. Gaillard,et al.  ‘Natural’ disaster? A retrospect into the causes of the late-2004 typhoon disaster in Eastern Luzon, Philippines , 2007 .

[9]  Mark Albert H. Zarco,et al.  The 17 February 2006 Guinsaugon rock slide-debris avalanche, Southern Leyte, Philippines: deposit characteristics and failure mechanism , 2008 .

[10]  Heesan Kim,et al.  Effects of chloride and crevice on corrosion resistance of stainless steels buried in soil within Seoul Metropolitan , 2014, Metals and Materials International.

[11]  Mark Albert H. Zarco,et al.  Laboratory Experiments on Steady State Seepage-Induced Landslides Using Slope Models and Sensors , 2011 .

[12]  A.V. Mamishev,et al.  Design principles for multichannel fringing electric field sensors , 2006, IEEE Sensors Journal.

[13]  Miguel Carlo L. Purisima,et al.  FPGA implementation of a Time Domain Reflectometry (TDR) system for slope monitoring applications , 2010, TENCON 2010 - 2010 IEEE Region 10 Conference.

[14]  Rosanno J C de Dios,et al.  Design, development, and evaluation of a tilt and soil moisture sensor network for slope monitoring applications , 2009, TENCON 2009 - 2009 IEEE Region 10 Conference.

[15]  Samuele Segoni,et al.  Rainfall thresholds for the forecasting of landslide occurrence at regional scale , 2012, Landslides.