Hydrogeological properties of a complex Dinaric karst catchment: Miljacka Spring case study

2014 ◽  
Vol 72 (4) ◽  
pp. 1129-1142 ◽  
Author(s):  
Josip Terzić ◽  
Tamara Marković ◽  
Jasmina Lukač Reberski
Keyword(s):  
Dinaric Karst ◽  
Hydrogeological Properties ◽  
Karst Catchment

scholarly journals Methodology for Determining the Die-Off Coefficient of Enterococci in the Conditions of Transport through the Karst Aquifer—Case Study: Bokanjac–Poličnik Catchment

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 820 ◽  
Author(s):  
Željko Šreng ◽  
Goran Lončar ◽  
Marin Grubišić
Keyword(s):  
Karst Aquifer ◽  
Field Measurements ◽  
Initial Step ◽  
Seepage Flow ◽  
Mean Value ◽  
Dominant Factor ◽  
Karst Environment ◽  
Karst Catchment

This paper presents the methodology for determining the die-off coefficient of faecal indicator bacteria (enterococci) when transported in a karst environment. The main problem in exploring karst environments, which this methodology strives to cope with, is lack of field measurements, poor data on karst rock formation, fractures and channels within it, and groundwater level dynamics. The analysed karst catchment (Bokanjac–Poličnik) is situated in the hinterland of the city of Zadar (Republic of Croatia) and covers an area of 235.07 km2. In the water supply wells within the analysed catchment, a frequent occurrence of enterococci was observed. The proposed methodology consists of two basic steps. Preliminary analyses as the initial step were used in the accumulation of certain assumptions related to the detection of increased concentrations of enterococci as well as in determination of the potential source of pollution. In the second step, the analytical model was constructed with the aim of resolving processes of sorption and die-off and determining the dominant factor in the process of natural removal of enterococci when transported in karst environment. Within the model, two parts of the pollutant transport are integrated: vertical percolation and horizontal seepage flow and transport. The mean value of the total die-off coefficient by transport through the unsaturated zone in the analysed case is k t o t = 8.25. Within the saturated zone the total die-off coefficient k t o t is within the limits of 0.1 and 0.5.

Wildfire impact on the hydrological conditions of an Alpine slope 

2021 ◽  
Author(s):  
Monica Corti ◽  
Andrea Abbate ◽  
Vladislav Ivanov ◽  
Monica Papini ◽  
Laura Longoni
Keyword(s):  
Soil Properties ◽  
Infiltration Rate ◽  
Hydrogeological Model ◽  
Infiltration Rates ◽  
Mountain Environments ◽  
Hydrogeological Properties ◽  
Infiltration Tests ◽  
Changes Over Time ◽  
The Impact

<p>Wildfire events have severe effects over mountain environments, changing dramatically the local terrain hydrogeological conditions and frequently affecting slope stability. Besides burning vegetation, wildfires induce a modification on soil properties that could result in a decreased capacity of infiltration. This leads to an increase of erosion and, potentially, of the related geohazards, such as flash flooding and debris flows, in the vicinity of the affected sites.</p><p>Past studies found that this reduced infiltration rate changes over time and the original hydrogeological soil properties are expected to recover in as long as 10 years after the wildfire event, depending on the environmental characteristics and on the soil properties of the site.</p><p>Our work aims to investigate the impact of a wildfire on the infiltration conditions of a slope located in the Southern Alps, considering as a case study a wildfire event occurred in Sorico (CO) in December 2018.</p><p>The effects of the wildfire on the infiltration rates and the subsequent recovery of the original hydrogeological properties were evaluated over the span of more than two years after the event. Infiltration tests were performed both within the most affected area as well as in the nearest unburnt area. Results were then correlated with precipitation and satellite imagery data in order to retrieve a recovery factor, necessary for the calibration of a simple 1D hydrogeological model.</p>

scholarly journals Water balance in karst: case study of the Ribeirão da Onça catchment in Colombo City, Paraná State - Brazil

2007 ◽  
Vol 50 (5) ◽  
pp. 905-912 ◽  
Author(s):  
Leandro Redin Vestena ◽  
Masato Kobiyama
Keyword(s):  
Water Balance ◽  
Groundwater Recharge ◽  
Potential Evapotranspiration ◽  
Balance Method ◽  
River Catchment ◽  
Monitoring Period ◽  
Water Balance Method ◽  
Hydrological Study ◽  
Karst Catchment

With the objective to analyze the hydrological processes and the water balance, a simplified water balance method and the modified Penman formula were applied to the Ribeirão da Onça river catchment in Colombo city, Paraná State. For the analysis, the data obtained during the monitoring period from 1997 to 2000 were utilized. The results showed that the values of the real evapotranspiration estimated by the method of the simplified water balance were negative for the certain periods and for other period sometimes more than those of the potential evapotranspiration estimated by the modified Penman formula. It implied the existence of significant groundwater recharge from other catchments to the study area, and indicates that the simplified water balance method was not suitable for the hydrological study of this karst catchment. The value of the groundwater recharge received by this catchment was estimated as 554 mm/year for the analysis period.

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