26 research outputs found

    Degradation of Dolines on Logaško polje (Slovenia)

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    As an example of long-term human intervention onto karst geomorphology, the article deals with the area of the Loga┼íko polje, where degradation processes of dolines have been very intense during the last fifty years. The analysis of aerial photographs from different periods (years 1944 and 2000) was carried out on a study area of 604 ha. It showed that 77.5 % of dolines (441 of total 569) have completly disappeared mostly by being filled up with different waste materials (excavation material, municipal, industrial and building waste etc.) or they were built up while 22.5 % (128) of dolines have been entirely or partly preserved. Several anthropogenic factors that had an important influence on doline-changes are being evaluated. Despite the fact, that doline is a typical geomorphological feature in karst landscape the public (local or state) and the scientific sphere pay little attention on their geomorphological preservation and protection. Considering the paradigm of sustainability, the landscape and its landforms, as they are part of EarthÔÇÖs surface, would need to be classified as a non-renewable natural heritage or even non-renewable natural resources

    Gravel plains in urban areas: gravel pits as an element of degraded landscapes

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    In the past, the excavation of gravel placed Jarški prod among areas of great opportunity, but this was followed by a major ecological blow: the filling of gravel pits with waste. The area started to regain significance with the construction of a drinking water pumping station and in accordance with the Spatial Plan of the City Municipality of Ljubljana is today seen as a forested area with a pronounced ecological or recreational importance. In spite of suitable legal foundations, as a protected water catch-ment area Jarški prod is in practice still unprotected. Considering the most important natural (shallow groundwater, easily permeable layer of gravel) and social characteristics (location near a densely popu-lated area, irresponsible attitudes), the groundwater is an extremely endangered natural resource

    Nekdanja odlagali┼í─Źa odpadkov v vrta─Źah in gramoznicah

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    This volume (ÔÇśFormer waste disposal sites in dolines and gravel pitsÔÇÖ) presents former waste disposal sites in depressions (dolines and gravel pits) using relief analysis of the former and current landscape and based on comparing them with one another. A comprehensive methodological approach has been created called the three-dimensional (3D) model, which is used to detect and record unknown, hidden former waste disposal sites in depressions above sensitive aquifers. The research deals with the problem of former waste disposal sites from the viewpoint of discovering them, creating a registry, and studying noticeable surface effects on the landscape (relief, soil, and vegetation).Monografija predstavlja nekdanja odlagali┼í─Źa odpadkov v kotanjah (vrta─Źe, gramoznice) z uporabo reliefne analize nekdanje in sedanje pokrajine ter na podlagi njune medsebojne primerjave. Z analizo reliefa smo na vzor─Źnih obmo─Źjih Loga┼íkega polja in Loga┼íkega ravnika ter Ljubljanskega polja dolo─Źili izhodi┼í─Źno stanje vrta─Ź in gramoznic pred njihovim zasipavanjem z odpadki. Dobljene rezultate smo preverjali s terenskim delom. Vzor─Źili (sondirali) smo prsti nad odpadki, na preseku zasutih kotanj smo merili elektri─Źno upornost tal, s fitogeografskim popisom pa smo dolo─Źili indikatorske rastline, ki so pokazatelj navzo─Źnosti organskih odpadkov v kotanji. Rezultati terenskega preu─Źevanja pomenijo nova izhodi┼í─Źa za bodo─Źe geoinformacijske analize rastlinstva in prsti na odlagali┼í─Źih odpadkov. Izsledki monografije so pomembna podlaga za morebitno izdelavo katastra nekdanjih odlagali┼í─Ź odpadkov na ravni celotne Slovenije, kjer je odprtih ┼íe veliko metodolo┼íkih izzivov, povezanih z razli─Źnimi tipi podatkov

    Detection of former landfills in gravel plain using geomorphometric analysis and High-Resolution LiDAR DTM

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    The article represents the application of geomorphologic approach to discover the potential areas of buried waste in agricultural landscape of Ljubljana gravel plain. Some former waste disposal sites or landfills are underground sites characterized by heterogeneous old waste buried in formerly concave landforms: old inactive gravel pits or paleo-riverbeds. They form different types of anthropogenic landforms. They were primary recognized and located with the terrain visualization (analytical shading, hypsometry) of LiDAR data and in continuation with geomorphometric analysis and classification of fluvial terrain. Due to subsidence of heterogeneous waste, terrain of former landfill sites is bumpy and uncharacteristic of fluvial surface morfology or terrain. The geomorphometric analysis was applied to differentiate the anthropogenic landforms (gravel pits, filled gravel pits ÔÇŽ) from natural alluvial landforms with combination of two geomorphometrics: multiresolution index of valley bottom flatness (MrVBF) and convergence index and high density LiDAR data. Result is the automatically derived classification of terrain in to three classes: (1) bumpy terrain, typical for areas with high terrain potential for landfill, (2) flat terrain, typical for dry paleo riverbeds and (3) ┬╗agricultural┬ź terrain, typical for intensive fields and meadows. By comparing the results of geomorphometric analysis with the results of visual analysis the 26 of 46 visually detected anthropogenic landforms are overlapping the areas of high terrain potential for landfill and among these 8 objects were proved with geohistorical analysis of archive aerial photographs

    Vegetation as the Bioindicator of Human-induced Degradation in Karst Landscape: Case Study of Waste-filled Dolines

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    Mismanagement practices, such as unsustainable waste disposal, created many degraded sites. In karst landscapes, old uncontrolled landfills are often located in dolines (sinkholes). Buried waste material in dolines represents degradation of landform, habitats and a potential danger of groundwater pollution. Buried waste provides heterogeneous ecological conditions on the surface, thus plant communities or individual plant species that developed on the surface of landfills can be used as a bioindicators of waste-filled doline sites and therefore indicators of land degradation. We aimed to discover the potential of vegetation to detect unknown locations of old dump-sites in suffusion dolines in Logaško polje (Dinaric Karst, Slovenia), either by plant communities or by plant species. We aimed to ascertain whether vegetation can indicate the dumping period by estimation of community succession stage. Locations and the age of waste-filled dolines (doline-dumps) were preliminary identified by a historical landscape study. Thus, we used time series of aerial photographs and digital photogrammetry tools for 3D modelling of historical terrain. Ecological evaluation was based on sampling the floristic composition of plots (5x5 m). We analysed ecological conditions by Ellenberg bioindicator values, structure by life history traits and naturalness by hemerobic levels of plants. We studied in detail 30 up to 50-years-old waste-filled dolines that are interspersed by dry and mesic grasslands. Ecological evaluation demonstrated that the main driver of ecological diversity at doline-dumps is the time at which the doline was backfilled and succession started. Annual and eutrophic communities dominate the youngest doline-dumps, middle aged doline-dumps are covered by nitrophilous perennial forbs and, finally, communities developed towards mesic grassland. We conclude that plant communities in combination with diagnostic plant species can be used as a bioindicators of doline-dumps in agricultural landscape of Logaško polje and can therefore indicate the sites of potential groundwater pollution sources but not the type of long-time buried waste.Key words: suffusion dolines, plant communities, waste dumping, Ellenberg indicator values, polje

    Dumping sites in the Ljubljansko polje water protection area, the primary source of Ljubljana's drinking water

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    Ljubljansko polje is a gravel plain lying along the Sava River north of Ljubljana. Although built-up areas are steadily expanding, the water protection area has helped preserve the character of relatively intensely cultivated agricultural land at least in its central part. However, illegal dumping sites pose a threat to the groundwater in the gravel aquifer. In the narrowest and narrow water protection areas of Ljubljansko polje, we have found, registered, and studied 1,445 illegal dumping sites with a total surface area amounting to 120,816 m2 and a total volume of 209,422 m3. A good seventh (13.5%) of the total waste is hazardous. In the area surveyed, we also registered 86 gravel pits, 47 information and warning signs, and 57 road barriers on access roads. In time, it will be necessary to rehabilitate all the illegal dumping sites; however, due to the large quantity of waste it is unrealistic to expect this to happen in one go, and we have therefore established a priority schedule for the rehabilitation

    Assessing the suitability of planned garden-plot areas in Ljubljana

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    This article examines garden plots in Ljubljana to present the planning of this self-sufficient vegetable production activity, which developed mostly spontaneously in all urban environments in and around Ljubljana. Some residents of Ljubljana, the Slovenian capital, are involved in this activity not so much because of economic necessity but because it provides recreation and relaxation, meets their need for direct contact with nature, and offers them an opportunity to produce healthy food. Typically, older people are involved in this activity, among which the number of highly educated people is unexpectedly high. The majority are happy with the plot-gardening situation. The city government has begun systematically removing garden plots in unsuitable locations, and has drafted a proposal to organize gardening areas in a way that does not pollute the environment, and at the same time provide them with suitable infrastructure. We evaluated the appropriateness of the planned locations in the draft City Municipality of Ljubljana Zoning Implementation Plan on the basis of the fulfillment of key exclusion and attraction criteria that were established based on survey answers included in support of the decision-making with the help of GIS tools. Decision-making by consensus, inclusion of public stakeholders, and establishing dialog between the city government and garden-plot users will need to be ensured in carrying out this plan

    Central settlements in Slovenia in 2016

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    This article presents central settlements in Slovenia and their main characteristics in 2016. We defined central settlements based on services of general interest and the population of an individual settlement, and developed the analysis further by using competitiveness indicators. We defined 360 central settlements at six levels of centrality, among which the significance of Ljubljana as a national center of international importance and the significance of intermunicipal, local, and rural centers are increasing. The significance of certain regional centers at the second and third levels of centrality is decreasing. The level of services of general interest supplied to Slovenian territory is relatively appropriate, but it should be improved by promoting competitiveness, especially in centers of national and regional importance

    Skrb za pitno vodo

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    Safeguarding Drinking WaterLjubljana's water resources lie in the immediate vicinity of built-up urban areas or even below them. For decades, they have been safeguarded as water-protection areas, which are specified by implementing regulations. However, formal protection through regulations is insufficient if the goal is to manage these sources in a sustainable manner. One of the most important goals of sustainable management is maintaining suitable provision of fresh drinking water without using any technological procedures toVodni viri mesta Ljubljane so v neposredni bli┼żini pozidanih mestnih zemlji┼í─Ź ali celo pod njimi. ┼Że desetletja jih varujejo vodovarstvena obmo─Źja. Eden od najpomembnej┼íih ciljev trajnostnega upravljanja je ohranjanje ustrezne oskrbe z naravno pitno vodo brez tehnolo┼íkih postopkov njene priprave, kar Ljubljan─Źani uvr┼í─Źajo visoko na lestvici vrednot ┼żivljenja v glavnem mestu Slovenije. Upravljanje ogro┼żenih vodnih virov v urbanih okoljih zahteva celosten pristop in stalne aktivnosti. S pomo─Źjo ra─Źunalni┼íkih orodij znamo sisteme simulirati in tako pridobiti dodatna v├ędenja o njihovem delovanju. Ta so v pomo─Ź pri dolgoro─Źnih odlo─Źitvah ali na primer ob okoljskih nesre─Źah. Za ustrezno na─Źrtovanje so potrebna strokovna orodja, ki omogo─Źajo zanesljive, pregledne in kvantitativne ocene u─Źinkov ukrepov. Razpolaganje z zanesljivimi ocenami stanja in napovedmi olaj┼íuje delo odlo─Źevalcem in tudi komunikacijo med dele┼żniki. Povezava v monografiji predstavljenih postopkov in rezultatov v sistem izvedljivega upravljanja z vodnimi viri v Ljubljani je dose┼żek, ki je lahko zgled ┼ítevilnim podobnim okoljem, ne le v Sloveniji, ampak tudi ┼íir┼íe
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