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> Landscape changes are distinguished into those generated by natural processes and those caused or triggered by human activity (Barsch et al. 1993; Jansky & Urbanova 1994; Favis-Mortlock et al. 1997; Bork et al. 1998; Voelkel 2005; Bičik & Kabrda 2007; Bičik & Jeleček 2009). The geoarchives do not reveal which of these factors ultimately caused greater soil erosion. Improved dating techniques are necessary to increase the temporal resolution of the sediment records which have clearly increased the level of knowledge in recent years (e.g. Geyh 2005, Kadlec et al. 2009).

> When examining sediment archives from recent times, we may have the opportunity to identify the factors controlling sediment formation in much more detail (e.g. Junge et al. 2005). This was the case with the natural "experimental setup" at Lake Mladotice (western Czech Republic), where it was possible to analyse a sediment archive dating back to 1872. Since the onset of lake sedimentation, rainfall and runoff have been recorded (in some cases continuously) at monitoring stations located in the surrounding area of the catchment area of the lake (Schulte 2007, Schulte et al. 2007).

> Air photos from several decades document pre- and post-communist land use changes in the lake's drainage basin. Furthermore, records exist of fertiliser programmes affecting sediments and hydrochemism. Because of the change in land use, increased soil erosion and a rise in the sedimentation rate were expected. Against this background, our investigations into the lake sediments and the drainage area of Lake Mladotice aim to address the following questions:


Lake Mladotice in the Western Czech Republic – Sediments as a Geoarchive

stability of the slope, as is discussed in detail by Jansky (1976, 1977).

– is typical for a larger region of western Bohemia.

Republic.

day, the only example of such a genetic type of lake in the Bohemian Massif.

for Flood Events and Pre- to Postcommunist Change in Land Use since 1872 309

Palaeozoic shale, sandstone and conglomerate, with some Proterozoic phyllite and spilite and Palaeozoic granite (Česky geologicky ustav 1996). The created lake is, up to the present

The preconditions for a landslide to occur on the slopes of the Potvorovsky Hill originated long before the catastrophic landslide of 1872. It is evident that there were multiple causes, and these should be viewed in the light of their mutual connections and not as isolated factors, owing to the fact that each of them contributed to a certain degree to disrupting the

Lake Mladotice still exists in the western Czech Republic about 30 km north of Pilsen. The receiving streams of the lake outflow are the Střela and Berounka Rivers; the latter drains into the Vltava River south of Prague. The erosion level of the lake is 413 m a.s.l.; its surface extends over 4.74 ha. The lake's drainage area is approx. 46.5 km², about 50% of which is being intensively farmed (Fig. 2). The lake's drainage basin – including the type of land use

Fig. 2. Drainage basin of Lake Mladotice and location of the study area in the western Czech
