Characteristics and indications of hydrogen and oxygen isotopes distribution in lake ice body

Stable isotopes have been used to identify the characteristics of precipitation, evaporation, basin hydrology, and residence times. However, lakes in the cold regions are usually covered by ice for 5–6 months. To get a better understanding of stable isotopes characteristics and indications in lake ice bodies, ice and water were sampled during the icebound season in both the ice and water bodies in Dali Lake, and deuterium, oxygen-18 total nitrogen (TN), and the major ions were analyzed. The results showed that deuterium and oxygen-18 compositions (δD-δ18O) compositions in the ice body were greater than in the water body beneath, scattered on a straight line, and deviating downward from the global meteoric water line in the top right. The ice profile showed that the δD-δ18O compositions increased from the ice surface downward and decreased near to the bottom. In contrast, the TN and the major ions in the ice decreased from the ice surface downward and increased near to the bottom, meaning that the concentrations of δ18O had a negative correlation with the concentrations of TN and major ions. These indicated that stable isotopes can be used for tracing the nutriment and ion transport processes in the ice body.

Environmental Isotopic and Hydrochemical Approach of Groundwater in Kerian Irrigation Scheme, Perak

The study scrutinizes the groundwater evolution and its relation in the Kerian irrigation scheme of Perak region using isotope and hydrochemical analyses. Nine representative groundwater samples were collected from nine different wells that cover the Kerian area. The samples are analyzed on geochemical characteristics, ionic composition and hydrofacies. Resistivity image profiling (RIP) surveys were carried out in tracing the existing of aquifer layer. The major ionic compositions show a wide variation in the hydrochemical properties of groundwater of the area. The degree correspondences among cations and anions have been estimated in order to evaluate their mutual relationship. The important hydrogeophysical parameters have been estimated for reasonable assessment of groundwater quality for irrigation purposes. Piper Diagrams have been plotted to classify the hydrofacies and Wilcox plot as well to quickly determine the viability of water for irrigation used. Interpretations of environmental isotope (18O and 2H) are applied to groundwater studies in the study area. The isotopic composition of 18O and 2H of groundwater and surface water have small variations and plot close to the global meteoric water line as well as local meteoric water line.