GEODYNAMICAL HAZARDS ASSOCIATED WITH LARGE DAMS

Sciences, 182 09 Praha 8
2 Dept of Geodesy and Photogrammetry, Agricultural
University, 50-357 Wroclaw
3 Mining and Metallurgical University of Ostrava, Faculty of
Mining and Geology, 705 33 Ostrava-Poruba
Summary: In 1997 the regional geodynamic network
SUDETEN was established in the Eastern Sudeten, covering
broad neighbouring regions of the Czech Republic and
Poland. On the territory of the Czech Republic the network
contains altogether 1 0 GPS measuring points. The GPS
points, in a form of concrete blocks, were built on places of
hard rock outcrops and/or very stable structures. In the area
still four other GPS networks operate. One is the regional
network MORAVA, which partly overlaps the network
SUDETEN in its southern part, and other three local
networks S'NIEZNIK, STOLOWE Mts. and PACZKO'W
investigate movement potentials of selected Sudeten fault
zones and their effects to water reservoirs Otmuch6w and
Nysa. It means that the regional network SUDETEN does not
monitor only the recent geodynamic processes occurring in a
large area in the Central Europe but also creates an umbrella
to all existing GPS networks.
The first GPS campaign was realised in August 1 997. The
accuracy of determination of coordinates was below 1 mm.
GEODYNAMICAL PROCESSES ON THE BANKS OF
THE WATER RESERVOIR NECHRANICE
Ing. Tamara Spanila
Institute of Rock structure and mechanics Academy of
Sciences of Czech Republic
Abstract:
V Holesovickach 41
CZ-18209 Prague 8
The dam and water reservoir Nechranice as the largest earth
dam is also one of the biggest water reservoirs concerning
surface area and volume of dammed water in the Czech
Republic. The dam was built in very unfavourable geological
conditions, but without any technical defects. The inundation
area of the dam, through which an important tectonic fracture