SLOPENET long-term slope deformations monitoring infrastructure
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1 long-term slope deformations monitoring infrastructure Jan Balek Jan Blahůt Filip Hartvich Jan Klimeš Michal Kusák Josef Stemberk Petr Tábořík Institute of Rock Structure and Mechanics AS CR CzechGeo / EPOS workshop
2 long-term slope deformations monitoring infrastructure monitoring network at various slope deformation sites in various geological, geomorphological and climatic conditions both in ČR and abroad long term monitoring since 1970s online application: sites info, working on data access goal and purposes: - application and testing of new methods (and correlation with classic ones) - testing newly developed or upgraded devices - providing answers in research of low frequency / high magnitude events: high society impact - working towards applicable regional warning systems: inputs and thresholds - solving challenges of long-term, various frequency, big data volume monitoring cooperation and coordination with other RI: TECNET, GNSS, Ringen
3 monitoring methods...and frequency engineering geological gauges geodetic surveying special sensors & devices M H Q M 10 rod dilatometer M steel tape extensometer M induction dilatometer D automatic extensometer H M Q levelling survey total station survey water level gauge H soil humidity monitoring M automatic water level gauge 10 automatic meteostation TM-71 crack gauge automatic TM-71 TLS monitoring time-lapse ERT
4 sites overview Site Ls type Geology Monitored since Compound slide Cretaceous sediments (claystones/marlston es) 1 Třebenice/ Czech. Rep. 2 Čeřeniště/ Czech. Rep. 3 Ondřejník/ Czech. Rep. 4 Kněhyně/ Czech. Rep. 5 Cyrilka/ Czech. Rep. Complex DSGSD DSL Tertiary volcanics (basalt/tuff) Mesozoic flysch rock Monitored characteristics 1994 Near surface movement; water table; ppt and temp Near surface movement; ground humidity; ppt and temp Near surface movement; ppt and temp. DSGSD Tertiary flysch rock 2002 Subsurface movements 57.5 m in crevice cave Monitoring techniques tape extensometer; automated water level sensor; meteostation TM71; tape extensometer; geodetic surveying; timelapse ERT, meteostation, soil humidity,tls geodetic survey; cable extensometer TM71 DSL Tertiary flysch rock 2000 Subsurface movements crevice cave - 10 m under surface TM71 Cretaceous 1973 Near surface movement TM71 6 Parohy/ Slovakia DSGSD - sagging carbonites 7 San Andrés/ Spain DSGSD Quaternary volcanics 8 Obří Hrad / Czech rep. 9 Příhrazy / Czech rep. 10 Valdštejn / Czech rep. rockslide DSGSD, plateau rim disintegration toppling (basalt/pyroclastic) Paleozoic paragneiss Cretaceous basin (sandstones /marls) Cretaceous sandstones 2013 Near surface and subsurface (500 m) movements 2003 Surface - rock blocks, blockfield 1991 Near surface - 3 m below surface Surface, block movements TM71; ADAS Holle dilatometer, steel tape extensometer TM-71, automatic extensometer, meteostation, water level gauge automatic extensometers
5 sites overview (ČR) long-term monitoring is crucial: slowly developing slope deformations Obří Hrad 13 years Čeřeniště 18 years TM Met TLS SH ae TS ERT Třebenice 22 years TE Met TE ad WL RD Met Dneboh 26 years TM ad WL Met RD Cyrilka 16 years TM Valdštejn 1 year ad TLS various geological and geomorphological conditions Ondřejník 9 years PL Kněhyně 14 years ae TM Met meteostation RD rod dilatometer ad aut. dilatometer TE tape extensometer ae aut. extensometer TLS repeated TLS TS TS survey WL water level SH soil humidity PL precise levelling ERT time-lapse ERT
6 results illustrative examples from various geological backgrounds: - Obří Hrad (Moldanubicum, crystalline gneisses) - Čeřeniště (České středohoří, volcanic tuffs and bazalts) - Dneboh (Cretaceous basin, sandstones and marls) long-term observation allows analysis of long-term trends and its changes
7 rockslide, block creep monitoring equipment: - rod dilatometer - steel-tape extensometer - automatic dilatometer since 08/2003 SLOPENET results Obří Hrad Obří Hrad
8 results Obří Hrad 13 years of dilatometric monitoring acceleration period , then deceleration max. absolute dilatation: 13 mm / 13 years (the Gate site) 3B 3A
9 Čeřeniště a complex DSGSD various types of SD = ideal as a natural lab concentration of various monitoring and observation systems: - TM-71 - automatic extensometer - time-lapse ERT - geodetic profile - meteostation - TLS new methods: - inclinometer - precise levelling - automatic TL ERT
10 Čeřeniště well-studied site ERT profiles confirm complicated structure complex slope deformation
11 results time-lapse (repeated) ERT monitoring 1x month Čeřeniště intention of automatization higher frequency (up to 1x / 4 hours) generally reflects water content - other parameters stays constant very slight changes biggest at slope with dry / wet deposits might work as early warning particularly if automatized
12 results Čeřeniště geodetic monitoring of surface movements: distal, flow-like part of landslide TS Leica TC1010 x-component since 12/2013 no significant movements dry years (perpendicular to landslide axis) y-component (along the landslide axis) x-component TS accuracy (ca 0.02 mm) (vertical)
13 results Čeřeniště continuous measurement of soil water pressure (tenziometer): - calibration of resistivity model - important parameter for landslide activation = effective humidity 2 depths: 20 and 50 cm 1m planned for spring better idea of water infiltration
14 results Čeřeniště automatic meteostation: atmospheric parameters compared with movement data unprecedented activation total displacement mm! triggered by very wet weather long-lasting precipitation unfortunately, our meteostation was not yet operational (since 11/2013)
15 Dneboh plateau rim disintegration, toppling, landslides classic site studied since 1926 landslide, current monitoring since 1990 geophysical and geodetical profiling active landslides various monitoring systems: - TM-71 - dilatometers - aut. dilatometers - water level observation - meteostation
16 results Dneboh dilatometric measurements of a rock tower (dilatometers, since 2015 also automatic) collapse of part of the tower in June 2012 = end of movement trend
17 results Dneboh TM-71 observes plateau disintegration: - possible tectonic influence compression and extension = increase and decrease of water level in boreholes
18 summary long-term slope deformation monitoring network uses combination of various monitoring methods and techniques testing of experimental methods and /or upgraded devices effort to concentrate numerous methods on suitable natural labs
19 current year & future installation of multiparametric inclinometer at Třebenice (+ drilling core analysis) - installation of automatic extensometer at Čeřeniště - installation of meteostations at Dneboh and Třebenice installation of multiparametric inclinometer at Čeřeniště (+ drilling core analysis) - installation of meteostation and soli humidity gauge at Ondřejník - installation of an experimental automatic TL-ERT at Čeřeniště (with GF Instruments) - precise levelling survey at Čeřeniště - testing of newly developed resistivity soil humidity gauge at Čeřeniště (with Chemcomex, a.s.) - web interface: meteorological and automatics data regional landslide susceptibility
20 thanks for attention
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