File:Erpfquelle Karstquelle Schwaebische-Alb.jpg

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Deutsch: Als Geotop und Naturdenkmal geschützte Karstquelle, „Molkenquelle/Brechlöchle“ aus dem Hangfuß in Erpfingen, Schwäbische Alb. Diese unterschiedlich stark schüttende Quelle, sowie zwei weitere Quellen südwestlich des Dorfes, speisen den kleinen Bach Erpf, der nach 2,3 km in die Lauchert mündet. Im pliozän-pleistozänen Alter war eine Ur-Erpf erheblich länger. Heute sind die ehemaligen Fortsetzungen Großes Rinnental und Höhlental zur jetzigen Erpf Trockentäler. Der Karstwasserspiegel hat sich seitdem ständig tiefer gelegt.
Ein geringfügiges Absinken des Karstwasserspiegels in der „Unteren Felsenkalk-Formation (ki2)“, ist an der Erpfquelle auch heute erstaunlich gut sichtbar: Ca. drei m über dem sichtbaren Wasserstand sind in einer Hangnische, oberhalb der Treppenstufen, die zu einer Häusersiedlung hoch führen, mehrere trockene Rinnsale erkennbar, die bei sehr hohen Niederschlagsmengen anspringende Karstquellen sind. Das im Hintergrund erkennbare gemauerte Gewölbe war der Hauptaustritt der Quelle, aus der jedoch heute bei „normaler Sommerschüttung“ nur noch ganz wenig Wasser austritt. Stattdessen dringt die größere Wassermenge nunmehr ganzjährig von unten aus dem Kanaldeckel aus (rechte Bildseite).

English: Protected Geotope and Natural monument “Molkenquelle/Brechlöchle“, a karst spring of rivulet Erpf, Swabian Alb. This spring and another two southwest of the village Erpfingen feed the rivulet, which flows into the upper Lauchert. In Pliocene-Pleistocene a much longer Ur-Erpf had its catchments further north, east of Undingen (Sonnenbühl). Since then the karst water table dropped drastically. A minor drop of the contemporary water table can very well be observed around the Molkenquelle/Brechlöchle: 3m above the visible water level of the lake are several tiny scores which become running karst springs, whenever precipitation is exceptionally high. Even the stoned vault in the back isn’t the main water spill anymore. Larger quantities rather emerge from underneath the drain cover.
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current21:26, 4 July 2016Thumbnail for version as of 21:26, 4 July 20161,800 × 1,200 (3.08 MB)Ustill (talk | contribs)User created page with UploadWizard

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