Narendra Nagar Landslide
The Real-Time Monitoring of Narendra Nagar Landslide uses various geotechnical instrumentation for the landslide investigations aimed for developing Early Warning System (EWS). The total area of Narendra Nagar landslide site to be covered for monitoring is approximately 0.25 km2.
The real-time monitoring of landslide prone hill slopes involves monitoring plan that not only provide immediate warning of landslide activity but also provide understanding about dynamics of slope failures.
Typical real-time landslide monitoring systems consist of following:
- Geotechnical Monitoring Instruments
- Datalogging with wireless data transfer
- Real Time Data Monitoring Software.
Encardio-rite got the contract for complete monitoring works that included:
- Supply and installation of geotechnical instruments
- Supply and commissioning of wireless (GSM/GPRS) data transfer network
- Drilling for all the boreholes required for installation of our instruments
- Real time database management system
The geotechnical instruments included:
- In-place Inclinometer for monitoring sub-surface lateral movement/deformation
- Piezometer for monitoring sub-surface water pressures for slope stability evaluation
- Borehole extensometer – three-point (electrical) for monitoring sub-surface settlement/movement
- Crack Meter for monitoring crack opening
- Creep Meter for monitoring large displacements/deformations of an active geologic fault in the earth
- Raingage for co-relating data from above geotechnical instruments
- Compact datalogger to collect data from all of the above instruments and transfer to central server
Location of the instruments were at three levels on the mountain i.e. at the crown, mid-level and toe. Drilling and installation of at all the three locations in the slopes was a difficult task, especially at the toe. However, all the instruments were installed successfully and are giving reliable data at pre-set frequency.
Monitored data was available online through Encardio-rite’s in-house developed DRISHTI, a web based data management system. The data was available in near real time to the stakeholders on their laptops and mobile phones.