Acid-volatile sulfides (AVS) are strongly associated with the bioavailability of some divalent metals such as cadmium, copper, lead, nickel and zinc. However, global spatial variability AVS for aquatic systems is unknown. The specific goals this study were to: (1) summarize all available monitoring data from types freshwater saltwater waterbodies (streams/creeks, rivers, lakes/ponds/reservoirs ...

Use of a deterministic fractal-multifractal (FM) geometric method to model width functions of natural river networks, as derived distributions of simple multifractal measures via fractal interpolating functions, is reported. It is first demonstrated that the FM procedure may be used to simulate natural width functions, preserving their most relevant features like their overall shape and texture...

Contamination of drainage channels and creeks with pesticides used in agriculture is of major concern in south eastern Australia. In this study the stream pesticide model RIVWQ version 2.02 was assessed for its applicability to simulate pesticide fate in drainage channels. The model was successfully calibrated against field data collected on flows and pesticide concentrations for a drainage cha...

Ausgehend von einer Vielzahl von Quellen haben Daten oft einen transienten Charakter und werden in Form von Datenströmen disseminiert. Zur adäquaten Verarbeitung existieren sogenannte Datenstrom-Managementsysteme (DSMS), die in der Lage sind, in strombasierter Art und Weise vom Benutzer spezifizierte Anfragen bzgl. der Datenströme auszuwerten und die Ergebnisse kontinuierlich auszugeben. In die...

A research has been undertaken studying pesticide losses from areas with intense agricultural and horticultural productions such as vegetables, cotton, pot plants and flowers, taking grab and composite samples including using passive SPMD samplers in ditches, creeks, rivers and groundwater, in addition to greenhouse and imported products. Pesticides were frequently found, occasionally in high c...

A long-term study of four degraded streams in the upper Owens River watershed documented the recovery of riparian habitats and significant improvement in channel morphology in response to grazing strategies, recreation management, and pre-irrigation peak flows. Increased control of livestock distribution, timing of forage use and degree of forage utilization on and near stream banks was designe...