engleski

Hidrogeological conditions and the necessity for the sanitary protection of the Norinska river - Prud spring, Metković, Croatia

A detailed description of hydrogeological relationships in karst aquifers from this part of the Dinarides and the recommended conditions for their protections are comprehensively given for the first time. The Norinska river spring is recharged by groundwater flow from the northwest, mainly from the Jezerac polje region, the northem part of Rastok polje and the middle course of the Trebi`at river. On the basis of geological, hydrogeological, hydrological and hydrogeochemical studies performed it was determined that a part of the water submerges in the region between Ljubusko polje and Kravice waterfall and is later discharged at the Norinska river spring. The sulfate in some springs along the left valley side of the Tihaljina river is the principal anion, and since these waters contribute to the waters in the Norinska river catchment they also impact its chemistry. The occurrence of turbidity and fine sand fractions at the Norinska river spring confirms the existence of developed underground channels, conduits and siphons a(ong which groundwater flows at velocities higher than 5 cm/s during high pluvial periods. The origin of sulfate is attributed to the presence of gypsum and anhydrite deposits in the deeper parts of the karstic aquifer. The groundwater protection zones where determined on the basis of the groundwater flow velocities, groundwater retention, urban development and the types of industries present within the areas covered by the Ljubuski and Vrgorac municipalities. This map is the basis for micro-zoning and the determination of locations for future mercantile (industrial) facilities. The study was focused towards surface karst phenomena and their protection from anthropogenic influence.

karst; karstification; groundwater protection; waste disposal; karst flow; hydrogeochemistry

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