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1
Content available remote Research on the international geodynamics test - area Plitvice Lakes within CERGOP-2 project
100%
Medak D. , Pribicevic B.
Reports on Geodesy
|
2006
|
tom z. 4/79
165-172
EN
Activities on this work-package subgroup include preparation activities at the University of Zagreb, Faculty of Geodesy and field reconnaissance in the area of the Plitvice Lakes National Park. The combination of equipment has been tested in the field and it is now ready to be deployed in the Plitvice Lakes test area. The goal is to measure the Lake Kozjak with the combination of precise bathymetry and RTK GPS (Real Time Kinematics). In the area of Plitvice Lakes, we were looking for the best positions (sky clearance, obstacles, satellite visibility, ground stabilization) for future geodynamic GPS-measurements. At the same time, we have chosen the points which will be used as base points for hydrographic measurements using the RTK-method. The cooperation with the Croatian Hydrometeorological Institute was established in order to compare the datasets of previous hydrological measurements with current situation in the Lakes. In cooperation with the tectonic experts we prepare the structural map of the area of the Plitvice Lakes in order to find better explanation for possible movements of tectonic units in the area. The geological situation is particularly important for hydrologic assessment since the loss of water (lowering of water level) in the lakes is caused by faults.
2
Content available remote Research on the international geodynamic test-area Plitvice Lakes within CERGOP-2 Project
100%
Medak D. , Pribicevic B.
Reports on Geodesy
|
2004
|
tom nr 4/71
117--124
EN
Activities on this work-package subgroup include preparation activities at the University of Zagreb, Faculty of Geodesy and field reconnaissance in the area of the Plitvice Lakes National Park. The combination of equipment has been tested in the field and it is now ready to be deployed in the Plitvice Lakes test area. The goal is to measure the Lake Kozjak with the combination of precise bathymetry and RTK GPS (Real Time Kinematics). In the area of Plitvice Lakes, we were looking for the best positions (sky clearance, obstacles, satellite visibility, ground stabilization) for future geodynamic GPS-measurements. At the same time, we have chosen the points which will be used as base points for hydrographic measurements using the RTK-method. The cooperation with the Croatian Hydrometeorological Institute was established in order to compare the datasets of previous hydrological measurements with current situation in the Lakes. In cooperation with the tectonic experts we prepare the structural map of the area of the Plitvice Lakes in order to find better explanation for possible movements of tectonic units in the area. The geological situation is particularly important for hydrologic assessment since the loss of water (lowering of water level) in the lakes is caused by faults.
3
Content available remote Processing of geodynamic GPS-Networks with GAMIT software
100%
Medak D. , Pribicevic B.
Reports on Geodesy
|
2003
|
tom z. 1/64
75-84
EN
In 1997 the project Basic GPS-Network of the City of Zagreb resulted in a modern, geodetic foundation of high accuracy for the Croatian capitol. More than 4250 points homogeneously covering the wider area of the City were established. Apart from that, the network was planned as the basis for investigations of tectonic movements and related seismic activity of Zagrebacka gora. In 2001, the second GPS-campaign was performed on 40 geodynamic points and similar proeessing techniques were applied to both sets of results. Scientific GPS-software GAMIT was used to process and compare two epochs (1997 and 2001) and the GLOBK module was used for origin analysis and calculation of displacements. In this paper, we describe our experiences with GAMIT and propose its wider use in CERGOP framework. Possible applications of performed measurements and results of interdisciplinary cooperation with other geoscientists are listed, too.
4
Content available remote Establishment of a new permanent station in the area of a Plitvice Lakes
100%
Medak D. , Pribicevic B.
Reports on Geodesy
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2002
|
tom z. 1/61
37-45
EN
Two GPS-permanent stations in the Republic of Croatia that were established in 2000, Dubrovnik and Osijek, became the part of two international networks designed for monitoring Earth`s crustal movements: EUREF-Permanent and International GPS-service for Geodynamics. Two another permanet stations, in Zagreb and Pula, are operating for long time and their inclusion in international projects has been recently considered. Within the working group dealing with the international geodynamic test-area Plitvice Lakes part of CEI programme CERGOP-2 a very important task would be to establish a new permanent station in this area. In this paper we review the basic tectonic pattern of the east Adriatic coast, the background of the IGS and EUREF Permanent projects, current situation of permanent stations in Croatia with a proposal for development of a Croatian GPS-permanent stations network. Such a network could be used for both numerous scientific investigations and practical real-time navigation on the land, at the sea and in air. The station in the area of Plitvice Lakes will be indispensable aid in all activities related to observation of geodynamic and hydrogeologic activity of the lakes.
5
Content available remote Investigation of geodynamics of Adriatic micro-plate by means of geodetic, geophysical and geologic methods
80%
Pribicevic B. , Medak D. , Prelogovic E.
Reports on Geodesy
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2003
|
tom z. 1/64
85-92
EN
We investigated the correlation between the results of astrogeodetic, gravimetric and geomagnetic measurements and the geological data about recent geological structures in the area of Eastern Adriatic. Comparison of movements of surface geological structures and geodetic and geophysical measurements yielded strong correlation between the three independent methods. Hence, combined recent structure of the area was obtained. We used the gravimetric data and total vertical deflections. Analysis of the results shows clearly defined boundary between the Adriatic Micro-Plate and the Dinarides, stretching from SE to NW along the outer rim of Croatian islands. Three independent sources of data show accurate location of two tectonic pIates, which cause significant seismicity in the area. Future research shall include seismological data.
6
Content available remote Application of geographical information systems and hydrographic surveying in the international geodynamic test area Plitvice Lakes
80%
Medak D. , Pribicevic B. , Dapo A.
Reports on Geodesy
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2006
|
tom z. 4/79
181-185
EN
During the second year of the project A Multipurpose and Interdisciplinary Sensor Array for Environmental Research in Central Europe (CERGOP-2/Environment), several important research activities in the International geodynamic test area Plitvice Lakes were performed. The geodynamic points in the vicinity of lakes were used as base point during combined GPS/echosounder measurements. Two frequencies have been used in order to find out about the underlying structures below the lake bottom. The results obtained show significant fabris which should be carefully interpreted in order to predict the future travertine formation, which is the essential phenomenon of the Plitvice Lakes. All data are processed by means of spatial analysis in a geographical information software (GIS). All equipment used was tested in laboratory conditions.
7
Content available remote Geodetic and geologic research of recent tectonic activity in Dinarides
80%
Pribicevic B. , Medak D. , Prelogovic E.
Reports on Geodesy
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2006
|
tom z. 4/79
173-180
EN
Initial tectonic movements of Adriatic Microplate result in dominating compression in the area of Dinarides. Collected structural data, compared with surface and depth data, with seismological and geodetic measurements taken in the account enabled the classifications of structures. Deformations and movements of structures directly depend on the stress orientation. This orientation varies from between 340-160° to 30-210°. In order to visualize the stress orientation, formation of different types of structures and their movements, examples of compressional structures are shown, as well as rotations of structures and conditions of creation of extensional structures. Finally, the map with fault zones is included, too. The data show narrowing of the area of Adriatic Microplate and the existence of its southern and northern part. Both parts are changing movement directions, leading to more tectonic activity. In active areas, formation of structures is recognized, and causality with fault locations and seismic activity is established. The amplitudes of tectonic movements derived from geodetic measurements between 1994 and 1998 represent important contribution for better understanding the tectonic activities in the area.
8
Content available Two-frequencies bathymetry of Plitvice Lakes
80%
Pribicevic B. , Medak D. , Dapo A. , Medved I.
Reports on Geodesy
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2006
|
tom z. 1/76
99-102
EN
Faculty of Geodesy, University of Zagreb, recently acquired the latest technology for performing the precise hydrographic surveying. The equipment consists of ATLAS DESO 14 surveying echosounder with two transducers: one with high frequency (210 kHz) and second with low frequency (33 kHz). The position of the transducer is determined with Real Time Kinematics GPS pair of Trimble R8 receivers. Thus, it is possible to use single-frequency DESO 14 for two-frequencies bathymetry through repeating the course of the vessel on exactly the same points with both transducers. The results of the application of this method in measuring two lakes in the National Park Plitvice Lakes are shown in this paper.
9
Content available Five years of EUREF-permanent GPS-stations in Croatia
80%
Medak D. , Pribicevic B. , Dapo A. , Medved I.
Reports on Geodesy
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2006
|
tom z. 1/76
91-97
EN
In October 2000, the Faculty of Geodesy, University of Zagreb, with the support o German Federal Agency for Cartography and Geodesy (BKG) and Croatian State Geodetic Administration, established two permanent GPS-stations: one in Dubrovnik and another one in Osijek. The stations became the part of large global network International GPS Service for Geodynamics (IGS), ie. the part of EUREF/Permanent project. This paper describes the background for the choice of locations, stabilization and precise measurements of local GPS-networks that connected the stations with EUREF/CROREF points nearby. The problems in the maintenance of the stations have been described as welI. A view on the perspective of permanent GPS-services in Croatia is given, too.
10
Content available Geodesy, tectonics and geodynamics of Dinnarides
80%
Medak D. , Pribicevic B. , Prelogovic E.
Reports on Geodesy
|
2006
|
tom z. 1/76
85-90
EN
This paper summarises recent aetivities on merging the geodetic, geologic and neotectonic evidence of geodynamics in Croatian part of Dinnarides. The area of the City of Zagreb, which is the boundary zone of Eastern Alps, Dinnarides and Pannonian Basin is incIuded as well. It is shown here that the evidence for fractures of Eastern Adriatic differs from the previous hypotheses. This concIusion is derived from the results of various geodetic measurements: satellite positioning (GPS), astro-geodetic measurements of detlections of the vertical. These results are combined with geologic measurements and results of seismic activity studies in order to give more detailed and more accurate picture of the current situation in the tectonically very active region of Dinnarides. Several GPS-campaigns performed in the City of Zagreb area are examined as well. Due to the proximity of Croatian capitol, special attention has been paid to the effects of possible hazard on construction code.
11
Content available Final Report on research activities within the project CERGOP2/Environment in Croatia
70%
Medak D. , Pribicevic B. , Prelogovic E. , Dapo A. , Medved I.
Reports on Geodesy
|
2006
|
tom z. 1/76
81-84
EN
Researchers from the Faculty of Geodesy, University of Zagreb, organized and performed various research activities within the project CERGOP2/Environment. The participation in both CEGRN campaigns was ensured with two epoch stations: Brusnik and Hvar. Activities related to the working package 10.4: International geodynamic test area Plitvice Lakes included several hydrographic measurements with the combination of GPS positioning and echosounder bathymetry. Repeated measurements with two frequencies yielded new insight about the sediments on the lake bottom. A structural map of the Lakes has been prepared, too. Geodynamic measurements has been performed on several special points. The foundation for future permanent station in the area of the Plitvice Lakes has been prepared.
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