Underground GPR measurements for spatial investigations in a salt dome
Ground penetrating radar (GPR) is an efficient non destructive tool for the exploration of underground salt deposits. The complex geological structures (bent, folded, sometimes faulted layering of salt, potassium, clay, and anhydrite) in low-conductive salt can be mapped if distance and direction of reflecting objects are known. In boreholes the information is given by direction sensitive borehole radar. In shafts rotation symmetry helps to detect the direction. In drifts direction finding antennae provide the reflection angle. Various antenna types help to enhance the resolution or the penetration depth. Measurements with different polarizations offer additional information about the reflecting structures. Within the last two decades unique results from a salt dome in Northern Germany with various GPR systems were achieved. With this information and some geological knowledge a three dimensional model of the structures has been created.
Estimation of anhydrite distribution with GPR and ERT in the northern part of the Morsleben salt structure
The Allertal salt structure, used as repository for nuclear waste, was explored from the surface by seismic measurements, ground openings and boreholes. Due to the accuracy of these investigations the internal salt structure is known. The complex geological structures (bent, folded, sometimes faulted layering of salt, potassium, clay, and anhydrite) in low-conductive salt can be mapped if distance and direction of reflecting objects are known. In focus of interest is the distribution of anhydrite layers in the center of the salt structure. Underground, GPR (Ground penetrating radar) is an efficient and precise nondestructive tool for the exploration of salt deposits. In case of conductive parts of the salt structure alternatively ERT (Electrical Resistivity Tomography) allows getting structural information. With geophysical results and some geological knowledge a three dimensional model of the salt structures can be created.
CULTURE, SUSTAINABLE URBAN DEVELOPMENT AND URBAN REGENERATION
Concerns about the conflict between economy, development on one hand and urban cultural heritage on the other hand, have made the urban development to be lately one of the most important themes at European level. Also, another issue of concern is social equity, aiming to strike a balance between economic development and equal access to culture for all generations of inhabitants of urban communities. Basically, ensuring these balances between urban cultural heritage, economy and social equity we express the essence of the concept of sustainable development from the perspective of culture. Urbanization is an ongoing process in all the cities of the world, but urban cultural heritage is a crucial element in the development of the cities and has an important impact over the quality of life of that community. Castles, churches, fortresses, squares and public buildings all contribute at the creating of the community history and of their characteristics.