Volume 1 Issue 2
The Study of Intensity, Duration and Type of Thunderstorms using Radar Images and Instability Indices in Southwest of Iran (Case Studies)
Foroozan Arkian*, Sajad shahheidar
Thunderstorms produce damaging winds, hail and shower over southwestern Iran during the cold season. We tried to obtain knowledge of Intensity, Duration and Type (IDT) of the storms by radar images and some convection-related parameters such as K, Showalter, Total Total, Helicity and Energy-Helicity (EHI) indices; Convective available potential energy (CAPE) and Bulk Richardson number (BRN) in the area. The surface and upper air data were taken from General Forecast System (GFS) with spatial resolution of 0.5°×0.5° and a temporal resolution of 6 h. The case studies consist three convective systems that caused severe damage and flooding in the area.
Groundwater Monitoring in Saint-Petersburg: Past and Present
A short history of groundwater monitoring in the second largest Russian city is given. It started in the 19th century and continues till now. In 1960-1980 the total number of monitoring wells was about 250. Based on the long-term monitoring results, several large scale hydrogeological maps have been compiled. They included the map of the groundwater regime, maps of the maximum groundwater table elevations, and geological-hydrogeological maps at the depths of 10, 25, and 50 m, respectively. Various statistical methods were applied for maps’ preparation and compilation. These maps are widely used by City’s Departments and Services as well as construction companies. As a result, geotechnical investigations at the construction sites could be reduced and focused on solving site specific rather than general problems.
Enhanced Removal of Arsenic Species from Water by Functionalised Mesoporous Hybrid Material
Salah Ali Mahgoub Idris*
In this study, two types of functionalised mesoporous silica, mercaptopropyl-SBA-15 (MP-SBA-15) and aminopropyl-SBA-15 (AP-SBA-15) were prepared and the adsorption of As (III) and As(V) species by these adsorbents was investigated. The equilibrium data well fitted the Langmuir sorption isotherms and the maximum adsorption capacity of As (III) and As(V) reached 98.2 mg/g and 97.2 mg/g for MP-SBA-15 towards As(V) extracted and APSBA-15 when As(III) extracted, respectively. The kinetics data found to be fitted by pseudo-second-order kinetic model. The adsorption thermodynamic parameters revealed that the uptake reactions of both As(III) and As(V) to adsorbents are spontaneous, endothermic and randomness adsorption behaviour at the solid/solution interface with some structural changes in the adsorbate and adsorbent has observed by the positive values.
Water Quality of Wetlands in Nepal: a Case Study of Jagadispur Reservoir Ramsar Site
Sony Baral, Rajendra Khanal, Rajendra Joshi*, Rita Bhatta, Amit Paudel, Kamal Thapa, Kyle LaVelle
Wetlands are considered as one of the most diverse ecosystems of the world, providing irreplaceable ecological functions and economic values. However, wetland ecosystem has been increasingly affected by water quality. In order to address this issue, various physico-chemical, microbial parameters, and nutrient content of the water from Jagadispur reservoir Ramsar site (Nepal) were analyzed. The results showed that the values of pH, electrical conductivity, total dissolved solids, nitrate, phosphate, bicarbonate, and chemical oxygen demand were in the permissible range for surface water.
Network Analysis on Bacterial Co-Occurrence Patterns in a Eutrophic Lake across a Perturbation Event
Nan Li*, Despoina S. Lymperopoulou
Several studies have assessed the variation and stability of bacterial communities in lakes in response to perturbation, yet specific ecological relationships among taxa affected by the perturbation are largely unknown. In this study, we used molecular ecological network (MEN) analysis to characterize co-occurring OTUs patterns across a major perturbation event (i.e. drainage) in Lake Munson. The OTUs within phyla tended to co-occur in a range from 10% to 76%. OTUs belonging to Acidobacteria, Actinobacteria, Bacteroidetes, Chloroflexi, Cyanobacteria and Nitrospira showed strong co-occurrence.
Current Problems with Drinking-water Quality in Argentina
The quality of drinking water is a powerful environmental determinant of human health, and biological and/or chemical pollution can, therefore, have profound repercussions on the latter. The present paper reviews the available literature on contaminated sources of surface and groundwater in different parts of Argentina, analyzes the origins of contamination and investigates the linkages between contaminated water and prevalent diseases in the affected areas.