Karol Weis | University Matej Bel, Banska Bystrica (original) (raw)

Papers by Karol Weis

The paper deals with changes in water volumes contained in the Halčiansky water reservoir as a re... more The paper deals with changes in water volumes contained in the Halčiansky water reservoir as a result of sedimentation and aggradation of bed loads and wash loads to the area of a water reservoir by the influence of erosive activity of tributaries in the watershed. The results of a comparison of two 3D models, one for the year 1908, created from historic documentation, and the other for year 2010, created from collection of data in the field, have shown a reduction in the volume of water totaling 35,874 m 3 , which represents the volume of sediments accumulated over the period of 102 years. Modern surveying technology and numerical modeling of the selected watershed surface area have been used for the determination of the changes in water volume. Analysis of secondary landscape structures, slope and empirical knowledge were performed in basin areas prone to erosion, in order to further the understanding of factors contributing to the erosion of the material. Water management, forestry, agriculture and population level, build-up of the area have all been identified as contributing elements, alongside other factors. KEY WORDS: bathymetric surveys – numerical modelling – reservoirs – ultrasonic measurements – volume change – watershed management.

The main goal of this work was to verify the historic data of historic artificial water reservoir... more The main goal of this work was to verify the historic data of historic artificial water reservoir Ottergrund, Banská Štiavnica district, which is inscribed in the UNESCO world heritage list. Main focus was set to area-storage capacity curve. There is historic map with the display of reservoir bottom contours and area-storage capacity curve in a paper format. These data were analysed and compared with the results of the calculation of area-storage capacity curve that was performed with the use of a new tool with named “ASC_Curve”, which is based on Python script. This tool utilizes ArcPy site package and it works with the TIN model of water reservoir bottom. In case of water reservoir Ottergrund we created the TIN model of the historic bottom; input data for the TIN model creation was the historic contour plan. The results of the analysis have shown that the storage capacity calculated with the use of the developed ASC_Curve tool is 97% of the volume mentioned in the historic map. Analysis has also show the minor mathematical errors in the calculations of the area-storage capacity data in historic contour plan. This tool can also be used also for the analysis of the current storage capacity conditions of the water reservoirs, if the surveying with echosounding equipment is performed to obtain the data to produce the TIN model of the water reservoir bottom.

The present study focuses on the analysis and evaluation of the changes in the retention volume o... more The present study focuses on the analysis and evaluation of the changes in the retention volume of the water reservoir Evička, the ecosystems of littoral, sublittoral and profundal zone as well as the changes in the land cover of the riparian zone and reservoir basin. The changes in reservoir volume were determined on the basis of a comparison of the actual bottom’s topography, acquired through field surveying with the bottom’s topography from the maps for a 40-year period (1971-2011). The volume of the sediments deposited in the water reservoir Evička for given period is 10917 m3. The changes in the landscape structures of riparian zone and reservoir basin, identified on the basis of the analysis of aerial measurement pictures, orthophotomap and field survey, were evaluated for the period of 1949-2012, i.e., 63 year. It is evident from the analysis of the landscape structure changes in the whole reservoir basin that the area of developed surfaces increased by 11.2% and the surface area of water reservoir Evička decreased by 1165 m2 during that period. We interpret these facts as the result of a negative anthropogenic effect, mainly by building activity within the reservoir basin and near the water reservoir. At the same time, the contribution presents possible measures for the management of water reservoir Evička and its surroundings.

This study analyses landscape components and human activities, in two different protected landsca... more This study analyses landscape components and human activities, in two different protected landscapes. The main purpose of this work is to measure landscape elements, mainly land cover patches within tourism zones. Outputs of the landscape quantification are numerical values, which is possible to interpret toward to the quality of an ongoing ecologic process in landscape. The interpretation of the quantified data will be used to determine ecologic signification of landscape in selected study areas. This research examines land cover patches in the protected areas by a set of landscape metrics for area, size, density, shape and diversity (Number of patches-NP, Patch's density-PD, Mean patch size-MPS, Patch's size standard deviation – PSSD, Mean shape index – MSI, and Shannon's Diversity Index-SHDI). First landscape is represented by Protected Landscape Area of Štiavnica Mountains, located in Slovakia, and second landscape is represented by Special purpose area of " Fruška Gora " National Park in Serbia. The classification of land cover patches was based on Corine Land Cover 2000 (CLC2000) seamless vector data. The result of the tourism impact on the landscape in protected area (Slovakia and Serbia) is the fragmentation of land cover patches. Recreational activities are the main reason of disruptions the integrity of the landscape in researched tourism zones. The increase of the landscape fragmentation may lead to the decreasing of biodiversity in future.

The mining region of Banská Štiavnica (Slovakia) has been inscribed into the UNESCO List of the W... more The mining region of Banská Štiavnica (Slovakia) has been inscribed into the UNESCO List of the World and Cultural Heritage in 1993. One of its special features is the system of artificial water reservoirs (locally referred to as “tajchy”) communicating via trenches built in early 18th century. The system was a water source, which drove the mining machines. Accumulation and transfer of sediments mainly depending on changes of land cover in the riparian zone leads to the loss of retention capacity and reduced life of reservoirs. Aim of this study is to analyse changes of the storage capacity/volume of the Veľká Kolpašská water reservoir that took place in the last is 123 years (1889–2012) and changes of land cover (LC) on the riparian zone in the course of the last 63 years (1949–2012). Volume and bottom relief changes were identified by comparison of bathymetric data drawn from the historical map of 1889 with the present data obtained in 2012 by bathymetric surveying. 3D models representing different situations were used for computation of the sediment volume. Results showed 57.801 m³ of sediments deposited in the course of 123 years that reduced the storage capacity of the reservoir by 7.23%. Changes of land cover in the riparian zone were detected via the analysis of aerial photographs (1949) and orthophotomaps from 2006, up-dated in the field for 2012. Analysis of changes show an increase of land cover categories which contribute to abrasion of banks, and the rate of sediment transfer to the reservoir ( by 11.030 m²) resulting in an increased silting potential.

The paper deals with changes in water volumes contained in the Halčiansky water reservoir as a re... more The paper deals with changes in water volumes contained in the Halčiansky water reservoir as a result of sedimentation and aggradation of bed loads and wash loads to the area of a water reservoir by the influence of erosive activity of tributaries in the watershed. The results of a comparison of two 3D models, one for the year 1908, created from historic documentation, and the other for year 2010, created from collection of data in the field, have shown a reduction in the volume of water totaling 35,874 m 3 , which represents the volume of sediments accumulated over the period of 102 years. Modern surveying technology and numerical modeling of the selected watershed surface area have been used for the determination of the changes in water volume. Analysis of secondary landscape structures, slope and empirical knowledge were performed in basin areas prone to erosion, in order to further the understanding of factors contributing to the erosion of the material. Water management, forestry, agriculture and population level, build-up of the area have all been identified as contributing elements, alongside other factors. KEY WORDS: bathymetric surveys – numerical modelling – reservoirs – ultrasonic measurements – volume change – watershed management.

The main goal of this work was to verify the historic data of historic artificial water reservoir... more The main goal of this work was to verify the historic data of historic artificial water reservoir Ottergrund, Banská Štiavnica district, which is inscribed in the UNESCO world heritage list. Main focus was set to area-storage capacity curve. There is historic map with the display of reservoir bottom contours and area-storage capacity curve in a paper format. These data were analysed and compared with the results of the calculation of area-storage capacity curve that was performed with the use of a new tool with named “ASC_Curve”, which is based on Python script. This tool utilizes ArcPy site package and it works with the TIN model of water reservoir bottom. In case of water reservoir Ottergrund we created the TIN model of the historic bottom; input data for the TIN model creation was the historic contour plan. The results of the analysis have shown that the storage capacity calculated with the use of the developed ASC_Curve tool is 97% of the volume mentioned in the historic map. Analysis has also show the minor mathematical errors in the calculations of the area-storage capacity data in historic contour plan. This tool can also be used also for the analysis of the current storage capacity conditions of the water reservoirs, if the surveying with echosounding equipment is performed to obtain the data to produce the TIN model of the water reservoir bottom.

The present study focuses on the analysis and evaluation of the changes in the retention volume o... more The present study focuses on the analysis and evaluation of the changes in the retention volume of the water reservoir Evička, the ecosystems of littoral, sublittoral and profundal zone as well as the changes in the land cover of the riparian zone and reservoir basin. The changes in reservoir volume were determined on the basis of a comparison of the actual bottom’s topography, acquired through field surveying with the bottom’s topography from the maps for a 40-year period (1971-2011). The volume of the sediments deposited in the water reservoir Evička for given period is 10917 m3. The changes in the landscape structures of riparian zone and reservoir basin, identified on the basis of the analysis of aerial measurement pictures, orthophotomap and field survey, were evaluated for the period of 1949-2012, i.e., 63 year. It is evident from the analysis of the landscape structure changes in the whole reservoir basin that the area of developed surfaces increased by 11.2% and the surface area of water reservoir Evička decreased by 1165 m2 during that period. We interpret these facts as the result of a negative anthropogenic effect, mainly by building activity within the reservoir basin and near the water reservoir. At the same time, the contribution presents possible measures for the management of water reservoir Evička and its surroundings.

This study analyses landscape components and human activities, in two different protected landsca... more This study analyses landscape components and human activities, in two different protected landscapes. The main purpose of this work is to measure landscape elements, mainly land cover patches within tourism zones. Outputs of the landscape quantification are numerical values, which is possible to interpret toward to the quality of an ongoing ecologic process in landscape. The interpretation of the quantified data will be used to determine ecologic signification of landscape in selected study areas. This research examines land cover patches in the protected areas by a set of landscape metrics for area, size, density, shape and diversity (Number of patches-NP, Patch's density-PD, Mean patch size-MPS, Patch's size standard deviation – PSSD, Mean shape index – MSI, and Shannon's Diversity Index-SHDI). First landscape is represented by Protected Landscape Area of Štiavnica Mountains, located in Slovakia, and second landscape is represented by Special purpose area of " Fruška Gora " National Park in Serbia. The classification of land cover patches was based on Corine Land Cover 2000 (CLC2000) seamless vector data. The result of the tourism impact on the landscape in protected area (Slovakia and Serbia) is the fragmentation of land cover patches. Recreational activities are the main reason of disruptions the integrity of the landscape in researched tourism zones. The increase of the landscape fragmentation may lead to the decreasing of biodiversity in future.

The mining region of Banská Štiavnica (Slovakia) has been inscribed into the UNESCO List of the W... more The mining region of Banská Štiavnica (Slovakia) has been inscribed into the UNESCO List of the World and Cultural Heritage in 1993. One of its special features is the system of artificial water reservoirs (locally referred to as “tajchy”) communicating via trenches built in early 18th century. The system was a water source, which drove the mining machines. Accumulation and transfer of sediments mainly depending on changes of land cover in the riparian zone leads to the loss of retention capacity and reduced life of reservoirs. Aim of this study is to analyse changes of the storage capacity/volume of the Veľká Kolpašská water reservoir that took place in the last is 123 years (1889–2012) and changes of land cover (LC) on the riparian zone in the course of the last 63 years (1949–2012). Volume and bottom relief changes were identified by comparison of bathymetric data drawn from the historical map of 1889 with the present data obtained in 2012 by bathymetric surveying. 3D models representing different situations were used for computation of the sediment volume. Results showed 57.801 m³ of sediments deposited in the course of 123 years that reduced the storage capacity of the reservoir by 7.23%. Changes of land cover in the riparian zone were detected via the analysis of aerial photographs (1949) and orthophotomaps from 2006, up-dated in the field for 2012. Analysis of changes show an increase of land cover categories which contribute to abrasion of banks, and the rate of sediment transfer to the reservoir ( by 11.030 m²) resulting in an increased silting potential.