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The oligohaline groundwater of marine beaches („Küstengrundwasser“;Remane) represents an ecological zone of contact between limnic and marine groundwater biotopes. In the „Küstengrundwasser“ and in all other brackish, marine and limnic interstitial waters there are two principal ecological factors: darkness and dimension of interstitial volume. These ecological conditions suggest a comprehensive classification of limnic, brackish and marine groundwater biotopes (except saline subterranean inland waters). Freshwater subterranean biotopes are classified in regard to the nature of the substrate containing groundwater, and the nature of contact with surface waters. The classification of subterranean biotopes influenced by marine conditions is based on the same factors plus salinity of the interstitial water. The “Venice system” for classification of brackish water is considered to be of limited value. In general, brackish subterranean waters should only be classified as: oligohaline, mesohaline or polyhaline thalassopsammal. The usefulness of the “Venice system” classification is limited to marine-influenced groundwater biotopes with an extremely stable salinity.

Klassifizierung mariner, brackiger und limnischer Grundwasserbiotope