At least potentially karstifiable rocks cover much of the surface of Egypt and northern Libya. Study of caves and other karstic features of this region has been hampered by lack of roads, rapid disintegration of the surface of friable, poorly consolidated limestone, wind-blown sand and other factors. Interbedding with marly aquicludes hampers speleogenesis locally. Calcareous and evaporite kars...

Karst landscapes—regions characterized by sinkholes, caves, springs, underground rivers, and slowly dissolving bedrock— constitute about 25% of the world’s land surface (1). Although some karst landscapes are attractive and of aesthetic value, most of them are recognized as fragile zones unsuitable as human habitats— mainly due to extremely poor soil cover, or a complete lack of soil, and rapid...

Nutrient contamination of surface waters and groundwaters is an issue of growing importance as the risks associated with agricultural run-off escalate due to increasing demands on global food production. In this study, the influence of surface water–groundwater interaction on the nutrient flux in a lowland karst catchment was investigated with the aid of alkalinity sampling and a hydrological m...

Tracer testing is the only method in karst hydrogeology that can definitively determine whether a particular site belongs to watershed of spring. Therefore, it an essential technique for delineating groundwater basins areas. The availability tracer test results often limited due complicated and relatively expensive application this approach, especially large regional watersheds. Croatian part D...

In karst areas, anthropogenic contaminants reach the subsurface with detrimental effects on groundwater ecosystem and downstream springs, which often serve as drinking water sources for local human communities. We analyzed chemistry microbial community composition in upstream locations of five hydrokarst systems (HKS) during four seasons. Conductivity nitrates were higher springs than pre-karst...