karst system
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2022 ◽  
pp. 1-11
Author(s):  
Andrea K. Borsodi ◽  
Dóra Anda ◽  
Attila Szabó ◽  
Melinda Megyes ◽  
Gergely Krett

Author(s):  
Mariana Menoncin ◽  
Miklós Murai ◽  
Péter Szombathy ◽  
Dénes Szieberth

Molnár János Cave (MJC) is the only underwater cave and the only active one in the Buda Thermal Karst system (BTK). At MJC, there is a large amount of water that can be considered as a possible source of drinking water. We evaluated the physical and chemical parameters of the cave water to understand natural and possible anthropogenic interference in water quality. Therefore, measurements of temperature and chemical compositions were performed for dripwaters and water from the cave conduits over a four-year period and compared to historical data. Statistical analysis of the produced data revealed yearly changes as well seasonal periodicity in the component ion concentrations. In the case of dripwaters, we observed a periodicity that revealed information about the origin of the dripwater. For the first time, we had identified seasonal variations in conduit waters. Previous studies only analyzed water at the entrance of the cave. Then, this research focuses on the water from the newly discovered inner passages.


2021 ◽  
Vol 66 (3) ◽  
pp. 89-103
Author(s):  
Piotr Szwarczewski

The Mozgawa area, located in the Ponidzie Pińczowskie Region (SE part of the Nida River Basin), is a very good example of response of the natural environment to the progressive human impact. The research conducted there indicates that before the appearance of the first Neolithic farmers, the relief of the area was different to the modern one. Constant and intensive agricultural use of the loess plateau and the adjacent slopes (started in the Neolithic period some 5890±100 BP) led to the filling of the valley bottoms and local depressions with deluvial deposits, the thickness of which reaches up to 12 m. The deposition of these sediments and elevation of the surface level in the subordinate areas resulted in the creation of the Mozgawka River channel since the begining of the Roman Period. Formerly it was impossible (as it was within the depression) and the runoff was only through the karst system. Since that moment it has also started the accumulation of the alluvial fan, the progradation of which leads to the pushing of the Nida River channel towards the East.


Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1382
Author(s):  
Anna Travé ◽  
Noelia Rodríguez-Morillas ◽  
Vinyet Baqués ◽  
Elisabet Playà ◽  
Lluís Casas ◽  
...  

Karst fills from the onshore Penedès Basin and offshore València Trough display red, pink, orange and ochre colours. Their Mössbauer spectra indicate that Fe3+ contained in goethite is the dominant species in reddish-pink fills, whereas Fe2+ contained in dolomite and clays is more dominant in the orange and ochre ones. The lower δ13C values and higher 87Sr/86Sr ratios of the karst fills with respect to their host carbonates can reflect the input of soil-derived CO2 and an external radiogenic source into the karst system. This geochemical composition, together with the non-carbonate fraction of the fills, consists of authigenic and transported illite, illite-smectite interlayers, as well as kaolinite, chlorite, pyrite, quartz, ilmenite, magnetite, apatite and feldspar, account for a mixed residual-detrital origin of fills. This polygenic origin agrees with that of the terra rossa sediments described worldwide. The different colours of karst fills are attributed to fluctuations in the water table, which control the Eh/pH conditions in the karst system. Thus, reddish colours reflect low water table levels and oxidising episodes, and orange and ochre ones reflect high water table levels and more reducing episodes. The greenish colours of fills could be related to fluctuations in the Fe3+/Fe2+ ratio.


Geomorphology ◽  
2021 ◽  
pp. 108095
Author(s):  
F. Pavano ◽  
G. Tortorici ◽  
G. Romagnoli ◽  
S. Catalano

2021 ◽  
Vol 879 (1) ◽  
pp. 012030
Author(s):  
D Lavilla ◽  
N Navarra ◽  
N Palarca

Abstract Conventional planning approaches that prioritize built-up areas and rapid urbanization for economic growth and social security, instead of the environment and the ecological services they provide have consistently been problematic in maintaining sustainability. Because of this, there is a growing need to shift from the conventional to a greener approach. The research argues that an ecological management approach is a viable choice of approach in protecting the ecological integrity of the landscape, especially in biotopes where ecological services are sought-after, such as the karst system Susong Dalaga found in Cabarroguis, Quirino Province. This approach is done by identifying the different biotopes to find the existing relations, services, and underlying issues of the place. In assessing the items mentioned earlier, the research finds that the natural systems are slowly dwindling due to the expansion of agriculture and built-up areas. Each biotope is then assigned with an appropriate approach, and with the consultation of the stakeholders, policies are then strategized for specific functions. It is hoped that the study would help push the application and integration of ecological management approach, and green approaches and principles in general, to future urban planning projects in the Philippines.


2021 ◽  
Vol 3 ◽  
Author(s):  
Adeline N. Y. Cojean ◽  
Katrina Kremer ◽  
Maciej Bartosiewicz ◽  
Stefano C. Fabbri ◽  
Moritz F. Lehmann ◽  
...  

Pockmarks are crater-like depressions formed by upward fluid flow (gas and/or liquid) through the unconsolidated sediment column on the floor of oceans and lakes. While pockmarks are well described in the marine realm, they have essentially been overlooked in lacustrine settings, likely due to a lack in economic interest to apply high-resolution hydroacoustic techniques in lakes. A swath-bathymetry survey on Lake Thun, Switzerland, revealed the existence of three pockmark systems. One pockmark (110 m in diameter) was discovered near a big karst system at Beatenberg at a water depth of ~217 m. Its activity is probably associated with episodic groundwater seepage induced by earthquakes, floods and snowmelt. At another site, Daerligen, we detected at ~60 m water depth the presence of multiple smaller pockmarks (~1.5 to 10 m in diameter) that seem to be active, continuously liberating CH4 gas by bubble ebullition. The CH4 displayed a biogenic carbon isotopic signature, however, the exact origin of the gas remains unknown. The third site, Tannmoos (~35 m water depth), comprises two large pockmarks (20–43 m in diameter) connected to a karst system in gypsum-carrying bedrock. One of these pockmarks is constituted of several unit pockmarks (e.g., sub-pockmarks; 0.3 to 0.8 m in diameter). While strong evidence is still lacking, we suggest that groundwater discharge occasionally occurs through these unit pockmarks during periods of intense precipitation. Hence, this study reveals the existence of three pockmark systems of variable morphology and mechanisms of formation within the same lake, reflecting different hydrological and biogeochemical regimes. Moreover, it underscores the potential importance of pockmarks in influencing hydrological and CH4 budgets in lakes. Clearly more work on quantifying seasonal fluxes of groundwater and CH4 release via lacustrine pockmarks is required, and it needs to be seen whether the observations made in Lake Thun are universal and apply also to many other lacustrine environments worldwide.


Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2106
Author(s):  
Mattia Di Cicco ◽  
Tiziana Di Lorenzo ◽  
Mattia Iannella ◽  
Ilaria Vaccarelli ◽  
Diana Maria Paola Galassi ◽  
...  

Groundwater invertebrate communities in karst landscapes are known to vary in response to multiple environmental factors. This study aims to explore the invertebrate assemblages’ composition of an Apennine karst system in Italy mainly described by the Rio Gamberale surface stream and the Stiffe Cave. The stream sinks into the carbonate rock and predominantly feeds the saturated karst into the cave. For a minor portion, groundwater flows from the epikarst and the perched aquifer within it. The spatial distribution of the species belonging to the selected target group of the Crustacea Copepoda between the surface stream and the groundwater habitats inside the cave highlighted a different response of surface-water species and obligate groundwater dwellers to the hydrogeological traits of the karst unit. Our results suggest that fast endorheic infiltration routes promoted the drift of epigean species from the surface to groundwater via the sinking stream while most of the obligate groundwater dwellers come from the perched aquifer in the epikarst from diffuse infiltration pathways.


Author(s):  
Stefanie Oberprieler ◽  
Gavin N. Rees ◽  
Daryl Nielsen ◽  
Michael Shackleton ◽  
Garth Watson ◽  
...  
Keyword(s):  

2021 ◽  
Vol 50 (2) ◽  
pp. 121-135
Author(s):  
Joeri Kaal ◽  
Virginia Martínez-Pillado ◽  
Antonio Martínez Cortizas ◽  
Jorge Sanjurjo Sánchez ◽  
Arantza Aranburu ◽  
...  

Speleothems are a recognized source of paleoclimatic information, but their value as a source of signals from human activities in caves with an archaeological record has rarely been explored. Previous studies of speleothems in the Sierra de Atapuerca karst system (Burgos, northern Spain) revealed an important human fossil record, provided information about human activities in and around these caves, and the impacts on their natural environment. The present study reports the results of molecular characterization of dark-colored laminae from the stalagmites Ilargi (Galería de las Estatuas) and GS1, GS2, and GS3 (Galería del Silo), by pyrolysis-GC-MS (Py-GC-MS) and thermally assisted hydrolysis and methylation (THM-GC-MS). The features of the organic matter demonstrate the presence of (1) a dominant aliphatic fraction probably from in situ bacterial and ex situ plant-derived lipids, (2) black carbon (from soot and/or charcoal), (3) polysaccharides and N-rich moieties (probably from bat guano and microbial sources), and (4) a signal of terpenoid derivatives that may originate from the overlying limestone (kerogen) and extant gymnosperm resin (soils) or cyanobacteria (cave). Some plant-derived lignin may be present as well but was not identified unambiguously. It is concluded that this approach allows identifying multiple general sources of organic matter which can help understand speleothem formation processes, and evidence of soot deposition could be clearly linked to human activities.


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