In recent years, a large number of mathematical models water quality have been developed which can be used for predictive calculations under certain conditions. This work is mainly devoted to the mechanical aspects substances transport in watercourse systems. It practically possible quickly determine concentration impurities river only by methods modelling transport.

. Abstroct: Ceará shclf waters response to steady and transicnt wind forcing, from Ponta Cajuais (04°42'S, 37"19.5'W) to Ponta de ltapagé (02°50SS, 4QoOQ'W), was studied using a hydrodynamic numerical mode\. The finitc difference model was based upon the equations for a barotropic ocean in general form: advective and quadratic surface and bottom stress terms were included. Seasonal differences ...

The discovery of hydrogen-rich waters preserved below the Earth's surface in Precambrian rocks worldwide expands our understanding of the habitability of the terrestrial subsurface. Many deep microbial ecosystems in these waters survive by coupling hydrogen oxidation to sulfate reduction. Hydrogen originates from water-rock reactions including serpentinization and radiolytic decomposition of wa...

About 700,000 on-site wastewater treatment systems (OWTS) have been installed in Sweden, serving both year-round and summer houses (Olshammar et al., 2015). Their treatment efficiency is often questioned, because they may contribute considerably to eutrophication of natural surface waters. It is estimated that the phosphorus (P) discharge of all the OWTSs accounts for 15% of the total anthropog...

  This study was carried out to investigate the occurrence of potentially pathogenic species of vibrio in sea water and estuarine environments of the Caspian Sea in the Golestan province of Iran. A total of 127 water samples from coastal waters as well as from river and estuaries were collected and analyzed by culture, during April and September 2001. Following prompt centrifugation, the resusp...

[1] We present new isotopic and micropaleontological data from a depth transect on Shatsky Rise that record the response of the tropical Pacific to global biotic and oceanographic shifts during the mid-Maastrichtian. Results reveal a coupling between the upper ocean, characterized by a weak thermocline and low to intermediate productivity, and intermediate waters. During the earliest Maastricht...

By now, all European freshwater and coastal marine ecologists should be familiar with the European Directive 2000/60/EC establishing a framework for Community action in the field of water policy, which is commonly referred to as the Water Framework Directive (WFD). The purpose of the directive is to establish a framework for the protection of inland surface waters, transitional waters, coastal ...

Light absorption by colored dissolved organic matter (CDOM) [aCDOM(λ)] plays an important role in the heat budget of the Arctic Ocean, contributing to the recent decline in sea ice, as well as in biogeochemical processes. We investigated aCDOM(λ) in the Southern Beaufort Sea where a significant amount of CDOM is delivered by the Mackenzie River. In the surface layer, aCDOM(440) showed a strong ...