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Temporal and spatial changes of the hydrological cycle are the consequences of climate variations. In addition to changes in surface runoff with possible floods and droughts, climate variations may affect groundwater through alteration of groundwater recharge with consequences for future water management. This study investigates the impact of climate change, according to the Special Report on Emission Scenarios (SRES) A1B, A2 and B1, on groundwater recharge in the catchment area of a fissured aquifer in the Black Forest, Germany, which has sparse groundwater data. The study uses a water-balance model considering a conceptual approach for groundwatersurface water exchange. River discharge data are used for model calibration and validation. The results show temporal and spatial changes in groundwater recharge. Groundwater recharge is progressively reduced for summer during the twenty-first century. The annual sum of groundwater recharge is affected negatively for scenarios A1B and A2. On average, groundwater recharge during the twenty-first century is reduced mainly for the lower parts of the valley and increased for the upper parts of the valley and the crests. The reduced storage of water as snow during winter due to projected higher air temperatures causes an important relative increase in rainfall and, therefore, higher groundwater recharge and river discharge.

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Litostratigrafija in geološke strukture so poglavitne za vpliv na tok podzemne vode v alpski� kraški� sistemi�. Razumevanje te� faktorjev je pomembno za razmejitev vodovarstveni� pasov. Gorska veriga Winterstaude v za�odni Avstriji pripada Helvetskemu pokrovu in se sestoji iz kredni� sedimentni� kamnin, vključno z dvema zakraselima formacijama apnencev: Örfla in Sc�rattenkalk (spodnji in gornji kraški vodonosnik), ki ju ločuje 60 m laporja. Plasti so nagubane in prekinjene s prelomi in premikom za 40-70 m. Nagubane karbonatne kamnine se nadaljujejo pod dnom aluvialne doline, tako da je kraški sistem razdeljen na plitvo in globoko freatično cono. Takšno območje je primerno za proučevanje vpliva gub in prelomov na tok podzemne vode v dvojnem vodonosnem sistemu. Cilj večsledilnega poskusa s sedmimi injicirnimi točkami je bil označitev �idravlični� povezav in linearni� �itrosti toka. Rezultati so pokazali, da (i) potopljene sinklinale tvorijo glavne odvodne poti v gornjem kraškem vodonosniku z najvišjimi linearnimi �itrostmi 91 m/�, medtem ko antiklinale predstavljajo razvodnice; (ii) napajanje spodnjega vodonosnika, ki oblikuje osrednji greben gorske verige, prispeva k izvirom, ki iztekajo iz gornjega vodonosnika ob vznožju gora (lokalni pretočni sistem); (iii) oba vodonosnika sta �idravlično povezana, domnevno preko prelomov, saj je nji�ov zamik istega velikostnega razreda, kot je debelina vmesnega laporja; (iv) tok v gornjem vodonosniku se nadaljuje pod dnom doline proti reki z najvišjimi �itrostmi 22 m/� (vmesni pretočni sistem). Ključne besede: alpska �idrogeologija, sistem veči� vodonosnikov, tok preko formacij, prelomna tektonika, večsledilni poskus, Avstrija.