Water Reservoir Within the Karst Field Overburden: Gusić Polje, Croatia

Geologia Croatica

Ante Pavičić¹  Damir Pešt²  Marijan Marasović²  Davor Benamatić³ 

[1] Croatian Geological Survey;Elektroprojekt;MOHO;

关键词: Surface water reservoir;    Karst;    Water losses;    Geophysical investigation;    Gusić polje;    Croatia;   

DOI  :  10.4154/GC.2002.09

来源: DOAJ

【 摘 要 】

The Gusić 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) ÒpressureÓ could be the construction of a

horizontal ÒventÓ 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.

【 授权许可】

Unknown