Groundwater recharge and residence times evaluated by isotopes of hydrogen and oxygen, noble gases and CFCs in a mountain catchment in the Jizera Mts., northern Czech Republic

2017 ◽  
Vol 51 (5) ◽  
pp. 423-437 ◽  
Author(s):  
Jakub Jankovec ◽  
Tomáš Vitvar ◽  
Martin Šanda ◽  
Takuya Matsumoto ◽  
Liang-Feng Han
Keyword(s):  
Czech Republic ◽  
Groundwater Recharge ◽  
Noble Gases ◽  
Residence Times ◽  
Mountain Catchment

Flow pattern and residence time of conduit flow and diffuse flow in calcareous sandstones (Bohemian Cretaceous Basin, Czech Republic)

2021 ◽  
Author(s):  
Iva Kůrková ◽  
Jiří Bruthans
Keyword(s):  
Czech Republic ◽  
Groundwater Flow ◽  
Residence Time ◽  
Dispersion Model ◽  
Tracer Tests ◽  
Water Levels ◽  
Northwestern Part ◽  
Residence Times ◽  
Karst Springs ◽  
Bohemian Cretaceous Basin

<p>Localities containing karst features were studied in the northwestern part of Bohemian Cretaceous Basin. Namely Turnov area in facies transition between coarse-delta sandstones and marlstones (Jizera Formation, Turonian) and Miskovice area in limestones and sandy limestones - sandstones (Peruc-Korycany Formation, Cenomanian). Evolution of karst conduits is discussed elsewhere (Kůrková et al. 2019).</p><p>In both localities, disappearing streams, caves and karst springs with maximum discharge up to 100 L/s were documented. Geology and hydrogeology of this area was studied from many points of view to describe formation of karst conduits and characterize groundwater flow. Tracer tests were performed using NaCl and Na-fluoresceine between sinkholes and springs under various flow rates to evaluate residence times of water in conduits and to describe geometry of conduits. Breatkthrough curves of tracer tests were evaluated by means of Qtracer2 program (Field 2002). Groundwater flow velocity in channels starts at 0.6 km/day during low water levels up to 15 km/day during maximum water levels, the velocity increases logarithmically as a function of discharge. Similar karst conduits probably occur in other parts of Bohemian Cretaceous Basin where lot of large springs can be found.</p><p>Mean residence time of difussed flow based on tritium, CFC and SF<sub>6</sub> sampled at karst springs is 20 years for 75% of water and 100 years for remaining 25%, based on binary mixing dispersion model. This shows that most of the water drained by karst conduits is infiltrated through the soil and fractured environment with relatively high residence time. Residence times in different types of wells and springs were also measured in whole north-western part of Bohemian Cretaceous Basin. Results indicate long residence times in semi-stagnant zones represented by monitoring wells and short residence times in preferential zones represented by springs and water-supply wells.</p><p> </p><p>Research was funded by the Czech Science Foundation (GA CR No. 19-14082S), Czech Geological Survey – internal project 310250</p><p> </p><p>Field M. (2002): The QTRACER2 program for Tracer Breakthrough Curve Analysis for Tracer Tests in Karstic Aquifers and Other hydrologic Systems. – U.S. Environmental protection agency hypertext multimedia publication in the Internet at http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=54930.</p><p>Kůrková I., Bruthans J., Balák F., Slavík M., Schweigstillová J., Bruthansová J., Mikuš P., Grundloch J. (2019): Factors controlling evolution of karst conduits in sandy limestone and calcareous sandstone (Turnov area, Czech Republic). Journal of Hydrology: 574: 1062-1073</p>

scholarly journals Forestry, mountain catchments and floods in the Czech Republic

2012 ◽  
Vol 50 (No. 11) ◽  
pp. 538-541
Author(s):  
M. Bíba ◽  
J. Jiřík ◽  
K. Vančura
Keyword(s):  
Czech Republic ◽  
Flood Control ◽  
Atmospheric Precipitation ◽  
Control Measures ◽  
Human Beings ◽  
Forest Environment ◽  
The Czech Republic ◽  
Local Climate ◽  
Mountain Catchment ◽  
Catchment Areas

A short introduction of historical overview and current situation refer to forestry problems of the country. Local climate is characterized and impacts of natural phenomena are described, as well as the impacts of human beings. The influence of forest management is mentioned and discussed in relation to latest catastrophic floods. The territory of the Czech Republic is damaged especially by a high intensity of atmospheric precipitation abnormal values which lead to a local or regional damage. In the catchment areas of torrents, damage leads to faster soil erosion, development of ravines, landslides, moving of soil sediments and their deposition, devastation of watercourse beds and properties, flooding while the flooding rates of flow represent a danger for the life of inhabitants. Important elements and results of respective research are described in brief. E.g. research of precipitation and its relation to the runoffs in the small mountain catchment areas with the forest stands restoration, as well as the forestry-hydrologic monitoring of forest environment, which has been taking place since 1928, and tradition of the service for torrent control. Forestry-hydrologic research gradually documents that a favorable flood-control performance of forest is limited. However, this is not a reason for not taking care of flood-control measures in the mountain afforested areas. These measures and importance of forest for the protection of land are historically verified and justified. In closing the mankind behavior to the landscape is underlined as a question mark.

scholarly journals Groundwater recharge and flow in a small mountain catchment in northern Ethiopia

2009 ◽  
Vol 54 (4) ◽  
pp. 739-753 ◽  
Author(s):  
KRISTINE WALRAEVENS ◽  
INE VANDECASTEELE ◽  
KRISTINE MARTENS ◽  
JAN NYSSEN ◽  
JAN MOEYERSONS ◽  
...  
Keyword(s):  
Groundwater Recharge ◽  
Northern Ethiopia ◽  
Mountain Catchment

scholarly journals Tracing groundwater recharge conditions based on environmental isotopes and noble gases, Lom depression, Bulgaria

2019 ◽  
Vol 24 ◽  
pp. 100611
Author(s):  
Marianna Túri ◽  
Mihály Molnár ◽  
Tatiana Orehova ◽  
Aglaida Toteva ◽  
Vladimir Hristov ◽  
...  
Keyword(s):  
Groundwater Recharge ◽  
Noble Gases ◽  
Environmental Isotopes

scholarly journals Seasonal Subsurface Water Contributions to Baseflow in the Mountainous Uhlířská Catchment (Czech Republic)

2019 ◽  
Vol 67 (1) ◽  
pp. 41-48 ◽  
Author(s):  
Martin Šanda ◽  
Tomáš Vitvar ◽  
Jakub Jankovec
Keyword(s):  
Czech Republic ◽  
Mass Balance ◽  
Groundwater Recharge ◽  
Soil Water ◽  
Water Storage ◽  
Winter Season ◽  
Summer Precipitation ◽  
Organic Soil ◽  
Subsurface Water ◽  
The Mean

Abstract Nine years of seasonal δ18O values in precipitation, soilwater and groundwater were evaluated in the Uhlířská catchment between 2008 and 2016 and recharge winter/summer ratios were calculated using δ18O values. The longterm average 18O content in groundwater is lower than the mean weighted 18O content in precipitation. This is explained by more than 50% of winter- and snowmelt- induced groundwater recharge that occurs in all years except of 2010 and 2013. The recharge of the peat organic soil water is balanced between summer and winter, whereas the mineral hillslope soil is dominantly recharged by summer precipitation. The 67% portion of baseflow, dominantly generated in the winter season, is composed of groundwater and peat organic soil water, according to the hydrochemical distribution of runoff components. Isotopic mass balance of individual winters shows that precipitation in warmer winters is entirely transformed into outflow until the end of the winter season, generating no significant water storage for potential drought periods

Social variation in size at birth and preterm delivery in the Czech Republic and Sweden, 1989-91

1998 ◽  
Vol 12 (1) ◽  
pp. 7-24 ◽  
Author(s):  
Koupilova ◽  
Vagero ◽  
Leon ◽  
Pikhart ◽  
Prikazsky ◽  
...  
Keyword(s):  
Czech Republic ◽  
Preterm Delivery ◽  
The Czech Republic ◽  
Social Variation ◽  
Size At Birth
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