Landslide Monitoring at a historical 14th century castle in Lithuania

In 2016, after a very rainy summer in Vilnius, the hill on which the Gediminas castle tower stands on started to slide.

01

About project

Landslides have affected the Gediminas hill many times and there is a need to keep it in its original state and open to the public. VDV is being used to monitor the Gediminas hill and all project data is sent to the VDV Cloud. Among display options used in the project is a Real Time Display with a top down view on the Gediminas hill. The display shows the location of prisms and tiltmeters where and a background color indicates the alarm status of each sensor. VDV is additionally used to create calculated variables (virtual variables), send alarm notifications and the project the VDV GIS is now being implemented.

The client and other involved partners are extremely happy with how reliable and easy to use VDV has been during the project.

— Gintaris Maknavicius, Geophysicist at Geomonitoringas STC
02

The challenge

Five large landslides had occured on the hill in a short period of time. It is composed of pebble and sand which makes it unstable. The project was to reinforce and reconstruct the hill and save this national monument built in the 14th century by Grand Duke Vytautas.

Multiple landslides after a rainy summer.
03

The solution

4 GeoMax AMTS were set up, observing 48 prisms on all four sides, 22 biaxial Loadsensing tiltmeters measuring building tilt and 4 GeoSense load cells monitoring the pressure on the foundation which supports the perimeter of the hill.

Data from all instruments is sent via FTP to the VDV Cloud servers every 5 to 60 minutes. All stakeholders have a username to log into the VDV System to view all data in real time. GPS Partneris and STC Geomonitoringas are responsible the instrumentation and have full access to the VDV system. There they can configure the alarms for any sensor, create Real Time Displays, new calculated variables and have full project overview.

Real Time Display showing all tiltmeters and alarm status of each one.
Real Time Display updated every 5 minutes with new data from all prisms.
04

The results

The monitoring has been now ongoing for three years since 2017 with a great success. The Gediminas castle is still going strong although the hill in question has undergone several repairs and most likely will continue to in the upcoming years, making it less permeable to water. Meanwhile stakeholders can easily view important data in real time in Vista Data Vision.