Fluoride (F) is an essential element of drinking water for human health, especially bone development and enamel creation. However, if the fluoride content in higher than 1.5 mg/L or lower 0.5 mg/L, it will cause endemic diseases, such as dental fluorosis. There are two main hydrogeological characteristics: properties water-bearing rocks groundwater conditions controlled guide basin. The geother...

In aeolian sandy grass shoal catchment areas that rely heavily on groundwater, mining-induced geological deformation and aquifer drainage are likely to cause irreversible damage natural groundwater systems affect the original circulation of thus threatening ecological environment. This study aimed predict impact level decline vegetation growth in Hailiutu River Basin (HRB), which is a coal-fiel...

The vent-hosted hydrothermal system of Ruapehu volcano is normally covered by a c. 10 million m3 acidic crater lake where volcanic gases accumulate. Through analysis of eruption observations, granulometry, mineralogy and chemistry of volcanic ash from the 1995^1996 Ruapehu eruptions we report on the varying influences on environmental hazards associated with the deposits. All measured parameter...

The Apuan Alps (Italy) are an internationally renowned karst region where several springs have a mean discharge exceeding 100 L/s, thus representing important water resources. One of the major springs, Pollaccia, was monitored for approximately one year. This spring drains structurally complex metamorphic aquifer that is characterized by multiple hydrologic sectors with variable recharge and in...

ABSTRACT Sixty-two 14 C dates are analyzed in combination with a recently established local floating tree-ring sequence for the Early Neolithic site of La Draga (Banyoles, northeast Iberian Peninsula). Archaeological data, radiometric and dendrochronological dates, as well sedimentary micro-stratigraphical information used to build Bayesian chronological model, using ChronoModel 2.0 OxCal 4.4 c...

Abstract Intense anthropogenic activities in arid areas have great impacts on groundwater process by causing river dried-up and phreatic decline. Groundwater recharge discharge become hot spot the oases of regions, but are not well known, challenging water ecological security. This study applied a stable isotope end-member mixing analysis method to quantify shallow sources interpret processes u...