Index Geophysics

eng Water Reservoir Within the Karst Field Overburden: Gusic Polje, Croatia

eng The Gusic reservoir is a compensation basin constructed in the karst field. The reservoir lies on a Quaternary overburden free of ponors (sinkholes) and suffosions. After the reservoir filling the water losses were up to <6.4 m3/s. The bottom impermeability has been ensured with a 0.4 m thick clay base blanket. During reservoir exploitation, suffosions and ponors developed through which 2 m3/s water was lost. Such conditions required reservoir repair within a short time frame of approximately 10 days during which the power plant was shut down. When the reservoir was emptied, a resistivity sounding (Wenner electrodes arrangement at five depth levels) was conducted on the reservoir bottom and clay blanket. An alternative concept has also been considered - the construction of a new reservoir area that has similar hydrogeological conditions. The solution for the possible impact of groundwater (air) “pressure” could be the construction of a horizontal “vent” in the deepest part of the palaeodepression, where the bedrock karstification is the most intensive and the interrelation between groundwater and air pressure on the overburden is possible. The reservoir bottom impermeability could be resolved with a clay blanket or with synthetic materials.

Pavičić, A.

Benamatić, D.

Pešt, D.

Marasović, M.

eng Surface water reservoir; Karst; Water losses; Geophysical investigation; Gusic polje; Croatia

Croatian Geological Survey

2002

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https://hrcak.srce.hr/3811

eng https://hrcak.srce.hr/file/6282

Geologia Croatica

ISSN 1330-030X (Print)

ISSN 1333-4875 (Online)

Volume 55

Issue 1

eng

info:eu-repo/semantics/openAccess

Full text of articles are freely accessable. Subscription to print issue is 500,00 Kn (80 Eur) per volume.