Karst water tracing in some of the speleological features (caves and pits) in Dinaric karst area in Croatia

2020 ◽  
pp. 229-236
Author(s):  
Mladen Garašić
Keyword(s):  
Karst Area ◽  
Karst Water ◽  
Dinaric Karst ◽  
Water Tracing

scholarly journals Comparative analysis of bacterioplankton assemblages from two subtropical karst reservoirs of southwestern China with contrasting trophic status

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Qiang Li ◽  
Yadan Huang ◽  
Shenglin Xin ◽  
Zhongyi Li
Keyword(s):  
Trophic Status ◽  
Alpha Diversity ◽  
Decisive Role ◽  
Sensu Stricto ◽  
Karst Area ◽  
Southwestern China ◽  
Rrna Gene ◽  
Karst Water ◽  
Bacterioplankton Community ◽  
Generation Sequencing

AbstractAlthough bacterioplankton play an important role in aquatic ecosystems, less is known about bacterioplankton assemblages from subtropical karst reservoirs of southwestern China with contrasting trophic status. Here, 16S rRNA gene next-generation sequencing coupled with water chemistry analysis was applied to compare the bacterioplankton communities from a light eutrophic reservoir, DL Reservoir, and a mesotrophic reservoir, WL Reservoir, in subtropical karst area of southwestern China. Our findings indicated that Proteobacteria, Firmicutes, Actinobacteria, Bacteroidetes, Cyanobacteria and Verrucomicrobia dominated bacterioplankton community with contrasting relative frequency in the two subtropical karst reservoirs. Proteobacteria and Bacteroidetes were the core communities, which played important roles in karst biogeochemical cycles. Though WT, TN and DOC play the decisive role in assembling karst aquatic bacterioplankton, trophic status exerted significantly negative direct effects on bacterioplankton community composition and alpha diversity. Due to contrasting trophic status in the two reservoirs, the dominant taxa such as Enterobacter, Clostridium sensu stricto, Candidatus Methylacidiphilum and Flavobacteriia, that harbor potential functions as valuable and natural indicators of karst water health status, differed in DL Reservoir and WL Reservoir.

scholarly journals The Analysis of the Water Resource Carrying Capacity in the Shale and Gas Exploration Area, Southwest China Karst Region ‒ A Case Study from Cenggong County

2017 ◽  
Vol 11 (1) ◽  
pp. 258-269 ◽  
Author(s):  
Xiaoqin Luo ◽  
Ganlu Wang ◽  
Yuliang Mou ◽  
Ruiying Liu ◽  
Hao Zhou ◽  
...  
Keyword(s):  
Sustainable Development ◽  
Water Resources ◽  
Water Resource ◽  
Shale Gas ◽  
Carrying Capacity ◽  
Karst Area ◽  
Ecological Environment ◽  
Karst Region ◽  
Karst Water ◽  
Water Resource Carrying Capacity

Introduction: As an unconventional natural gas resource, shale gas is the current hot topic in the oil and gas industry. China is rich in shale gas resource, most of which lies in the Southwest Karst Area with its fragile ecological environment. Discussion: The following questions must be studied before exploration thereof: on one hand, shale gas mining requires a lot of water, on the other hand, if the karst region water resources can support shale gas mining over a large area, and if the consequent water/environmental pollution problems will bring more severe challenges to the sustainable development of society and the economy in the southwest karst area, there is a potential conflict requiring a research-based resolution. The water resource carrying capacity is an important measure of the potential sustainable development of a karst region, with its unique geological structure and fragile natural landscape. Therefore, the study of karst water resource carrying capacity is of great significance. Conclusion: This essay is based on Cenggong County, one of the five key shale gas exploration areas in Guizhou at the end of 2012. By calculating the water resource carrying capacity in the studied area with the help of the ecological footprint method, it is concluded that the existing water resources in the studied area can support shale gas exploration. However, shale gas mining will cause a change in the industrial structure within the region. In addition, it has significant effects on the bearing capacity of water resources in the ecological environment.

scholarly journals The Application of Improved SWAT Model to Hydrological Cycle Study in Karst Area of South China

2019 ◽  
Vol 11 (18) ◽  
pp. 5024 ◽  
Author(s):  
Wang ◽  
Shao ◽  
Su ◽  
Cui ◽  
Zhang
Keyword(s):  
Assessment Tool ◽  
Hydrological Cycle ◽  
Water Cycle ◽  
Southern China ◽  
Swat Model ◽  
Hydrologic Model ◽  
Karst Area ◽  
Karst Water ◽  
Distributed Hydrological Model ◽  
Lumped Model

In the karst area of southern China, karst water is important for supporting the sustainable production and home living for the local residents. Consequently, it is of significance to fully understand the water cycle, so as to make full use of water resources. In karst areas, epikarst and conduits are developed, participating in the hydrological cycle actively. For conventional lumped hydrologic models, it is difficult to simulate the hydrological cycle accurately. These models neglect to consider the variation of underlying surface and weather change. Meanwhile, for the original distributed hydrological model, the existence of epikarst and underground conduits as well as inadequate data information also make it difficult to achieve accurate simulation. To this end, the framework combining the advantages of lumped model–reservoir model and distributed hydrologic model–Soil and Water Assessment Tool (SWAT) model is established to simulate the water cycle efficiently in a karst area. Xianghualing karst watershed in southern China was selected as the study area and the improved SWAT model was used to simulate the water cycle. Results show that the indicators of ENS and R2 in the calibration and verification periods are both above 0.8, which is evidently improved in comparison with the original model. The improved SWAT model is verified to have better efficiency in describing the hydrological cycle in a typical karst area.

scholarly journals Cross-Correlation and Cross-Spectral Analysis of the Hydrographs in the Northern Part of the Dinaric Karst of Croatia

Geosciences ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 86 ◽  
Author(s):  
Krešimir Pavlić ◽  
Jelena Parlov
Keyword(s):  
Spectral Analysis ◽  
Cross Correlation ◽  
Coherence Function ◽  
Karst Area ◽  
Karst Aquifers ◽  
Dinaric Karst ◽  
Input Signals ◽  
Runoff Regime ◽  
Groundwater Reserves ◽  
Insight Into

Correlation and cross-spectral analysis of hydrographs was performed on the karst area of the mountainous section of the Kupa River in two time periods. Since there are karst aquifers in this area that is a part of strategic groundwater reserves of potable water, such an analysis could give better insight into the behavior of these aquifers. The functions used to describe karst aquifers are the cross-correlation function, coherence function, gain function, and phase function. The outcomes of the analysis results were very similar in the two analyzed periods, suggesting that differences in input signals between these two periods do not affect the aquifer function as a system filter. The results of this research suggest that the aquifer and overburden layer characteristics have a much stronger influence than the change of input signal on the runoff regime in the considered period.

scholarly journals Hydrologic and geochemical modeling of a karstic Mediterranean watershed

2012 ◽  
Vol 9 (1) ◽  
pp. 1-27 ◽  
Author(s):  
N. P. Nikolaidis ◽  
F. Bouraoui ◽  
G. Bidoglio
Keyword(s):  
Climate Change ◽  
Water Management ◽  
Swat Model ◽  
Livestock Grazing ◽  
High Rate ◽  
Karst Area ◽  
Water Volume ◽  
Climate Change Scenarios ◽  
Karst Water ◽  
Simulation Results

Abstract. The SWAT model was modified to simulate the hydrologic and chemical response of karstic systems and assess the impacts of land use management and climate change of an intensively managed Mediterranean watershed in Crete, Greece. A methodology was developed for the determination of the extended karst area contributing to the spring flow as well as the degree of dilution of nitrates due to permanent karst water volume. The modified SWAT model has been able to capture the temporal variability of both karst flow and surface runoff using high frequency monitoring data collected since 2004 in addition to long term flow time series collected since 1973. The overall hydrologic budget of the karst was estimated and its evaporative losses were calculated to be 28% suggesting a very high rate of karst infiltration. Nitrate chemistry of the karst was simulated by calibrating a dilution factor allowing for the estimation of the total karstic groundwater volume to approximately 500 million m3 of reserve water. The nitrate simulation results suggested a significant impact of livestock grazing on the karstic groundwater and on surface water quality. Finally, simulation results for a set of climate change scenarios suggested a 17% decrease in precipitation, 8% decrease in ET and 22% decrease in flow in 2030–2050 compared to 2010–2020. A validated tool for integrated water management of karst areas has been developed, providing policy makers an instrument for water management that could tackle the increasing water scarcity in the island.

scholarly journals Ecological and faunistic features of caddisflies (Insecta: Trichoptera) in different types of habitats in the Dinaric karst area (Central Croatia)

2020 ◽  
Vol 36 ◽  
pp. 6-39
Author(s):  
Darko Cerjanec ◽  
Mladen Kučinić ◽  
Marina Vilenica ◽  
Anđela Ćukušić ◽  
Renata Ćuk ◽  
...  
Keyword(s):  
New Records ◽  
Uv Light ◽  
Light Trap ◽  
Karst Area ◽  
Ecological Knowledge ◽  
Chemical Parameters ◽  
Dinaric Karst ◽  
Ecological Features ◽  
Physico Chemical ◽  
Different Types

Caddisfly faunistic and ecological features were studied at 14 sampling sites along the catchment area of the Dobra River. Adults were collected monthly, over a period of 13 months (from early November 2009 until the end of November 2010), using ultraviolet (UV) light trap and entomological net. Physico-chemical parameters of water and air were also measured at all sampling sites. The study encompassed several segments of caddisfly fauna: the composition, new records, the distribution of all recorded species and seasonal dynamics. A total number of 77 species were recorded, out of which 15 species and four genera were new records for Croatian caddisfly fauna. The CCA analysis showed that the water temperature and the altitude had the highest impact on distribution of caddisfly fauna in this area. The results of this study contribute to the increase of faunistic and ecological knowledge of the Croatian caddisflies.

scholarly journals Discrimination of topsoil environments in a karst landscape: an outcome of a geochemical mapping campaign

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Ozren Hasan ◽  
Slobodan Miko ◽  
Nikolina Ilijanić ◽  
Dea Brunović ◽  
Željko Dedić ◽  
...  
Keyword(s):  
Discriminant Function ◽  
Karst Area ◽  
Soil Geochemistry ◽  
Dinaric Karst ◽  
Potentially Harmful Elements ◽  
Environmental Criteria ◽  
Karst Soil ◽  
Geologic Setting ◽  
Underlying Mechanisms ◽  
Function Models

AbstractThe study presented in this work emerged as a result of a multiyear regional geochemical survey based on low-density topsoil sampling and the ensuing geochemical atlas of Croatia. This study focuses on the Dinaric part of Croatia to expound the underlying mechanisms controlling the mobilities and variations in distribution of potentially harmful elements as observed from different environmental angles. Although serious environmental degradation of the vulnerable karst soil landscapes was expected to occur chiefly through the accumulation of various heavy metals, the most acute threat materialized through the soil acidification (Al-toxicity) affecting the entire Dinaric karst area. This picture surfaced from the analysis of all three investigated discriminant function models employing the abovementioned environmental criteria selected autonomously with respect to the evaluated soil geochemistry, namely, geologic setting, regional placement and land use. These models are presented by not only the characteristic discriminant-function diagrams but also a set of appropriate mathematically derived geochemical maps disclosing the allocations of potential threats to the karst soil landscapes posed by soil acidity.

scholarly journals Crystallization law of karst water in tunnel drainage system based on DBL theory

Open Physics ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 241-255
Author(s):  
YongDong Wang ◽  
Yang Liu ◽  
ChuFan Qi ◽  
TianYue Zhou ◽  
Ming Ye ◽  
...  
Keyword(s):  
Flow Rate ◽  
Pipe Wall ◽  
Functional Model ◽  
Drainage System ◽  
Crystallization Rate ◽  
Normal Operation ◽  
Karst Area ◽  
Karst Water ◽  
Flow State ◽  
Drainage Pipe

Abstract When a tunnel is constructed in a karst area, crystallization of the drainage pipe caused by karst water often threatens the normal operation of the tunnel. This work contributes to this field of research by proposing a functional model based on the diffusion boundary layer (DBL) theory proposed by Dreybrodt in the 1990s. The model is formed by determining the flow rate distribution of the drainage pipe in a laminar flow state and turbulent state, and then by applying Fick’s diffusion law and Skelland’s approximate formula. Then, to further verify the applicability of the functional model, a model test was carried out in the laboratory and the test results are compared to the theoretical results. The results show that the crystallization rate of karst water is mainly affected by the roughness of the pipe wall, followed by the slope of pipes. The slope can affect flow state by controlling the flow rate, which in turn affects the crystallization rate of karst water. When the slope of the drainage pipe is 3, 4, and 5%, the error between the experimental results and the theoretical calculation results is 24.7, 8.07, and 27.9%, respectively, and when the liquid level in the pipe is 7.2, 10.2, and 13.3 mm, the error is 27.9, 9.82, and 2.07%, respectively. Considering that the flow will take away the crystalline deposits on the pipe wall in the experiment, although some results have certain errors, they do not affect the overall regularity.

scholarly journals SPATIAL AND TEMPORAL VARIATION OF HIDROGEOCHEMISTRY AND KARST FLOW PROPERTIES TO CHARACTERIZE KARST DYNAMIC SYSTEM IN BRIBIN UNDERGROUND RIVER, GUNUNG KIDUL REGENCY, DIY PROVINCE

2017 ◽  
Author(s):  
Tjahyo Nugroho Adji
Keyword(s):  
Dynamic System ◽  
Temporal Variation ◽  
Flow Characteristic ◽  
Karst Aquifer ◽  
Flow Characteristics ◽  
Karst Area ◽  
Spatial And Temporal Variation ◽  
Karst Water ◽  
Carbonate Mineral ◽  
Underground River

This research is conducted in karst area, which is particularly enclosed by Bribin Underground River Catchment, Gunungkidul Regency. The objectives of thisstudy are: (1) to understand spatial and temporal variation of flow characteristic as well as Diffuse Flow Proportion (PAD) of Bribin River; (2) to assesshydrogeochemistry and to recognize the relationship between hydrogeochemistry and flow characteristics of Bribin River, and (3) to define water agressivity of BribinRiver with respect to carbonate mineral and to express the components of Karst Dynamic System (KDS) one-year behavior. To define flow characteristic and PAD, three water level data loggers are installed within upper, lower and the leakage point along Bribin River continued bydischarge measurement with the purpose of attaining stage-discharge rating curve. Afterwards, PAD is defined by conducting digital filtering baseflow separationapproach after calculation of diffuse, fissure, and conduit recession constant. Next, to figure out hydrogeochemical condition, 120 sample of karst water are analyzedincluding rain, underground-river, and drip water. After that, scatter plots between hydrogeochemical parameters are conducted to achieve the correlation betweenPAD and hydrogeochemistry as well as to figure out hydrogeochemical processes to occur. Subsequently, Saturation Indices analysis with respect to calcite mineral and KDS components correlation is carried out to define karst water agressivity and its manners along flowpath of Bribin River. The research’s result demonstrates that there is spatial and temporal differentiation of flow characteristics along Bribin River attributable to thecomportment of karst aquifer toward discharging its diffuse, fissure, or conduit flow components, which consequence to the dissimilarity of PAD distribution alongBribin River. Accordingly, PAD characteristics result to dry season hydrogeochemical condition of Bribin River. However, wet season hydrogeochemical condition is more influenced by means of dilution by precipitation process within flood events, which exaggerates CO2 content of water. Generally, the upper-stream cave tend to more aggressive in dissolving limestone, contrast to down-steam cave that be inclined to precipitate carbonate mineral as a result of their differentiation of cavities configuration. In addition, down-stream cave is characterized by open system cavities, subsequent to the CO2 discharge to preserve dissolution process.

Sign in / Sign up

Export Citation Format

Share Document