the present study was carried out to determine the possible origins of sediments entering taleghan dam in northern part of iran, in order to avoid further sedimentation and helping in extension of the useful life of the proposed dam. this was performed by xrd analysis. to do so, first of all, sediment sampling points were positioned along the taleghan river. the collected samples, after coding,...

The surface erosion area in the Yangtze River basin increased from 364×10 3 km 2 in the 1950s to 707×10 3 km 2 in 2001 due to a great increase in population. Based on the regression relationship between surface erosion area and population, the surface erosion area was predicted to be about 280×10 3 km 2 at the beginning of the 20 th century. The sediment yield, which increased by about 30% duri...

Reservoirs are artificial ecosystems with physical, chemical, and biological transitional characteristics between rivers and lakes. Greater water retention time in reservoirs provides conditions for cycling materials inputs from upstream waters through sedimentation, biological assimilation and other biogeochemical processes. We investigated the effects of reservoirs on the water quantity and q...

The Burdekin River catchment ( 130,400 km) is a seasonally dry tropical catchment located in north-east Queensland, Australia. It is the single largest source of suspended sediment to the Great Barrier Reef (GBR). Fine sediments are a threat to ecosystems on the GBR where they contribute to elevated turbidity (reduced light), sedimentation stress, and potential impacts from the associated nutri...

Helge Holden a, Kenneth Hvistendahl Karlsen b and Knut-Andreas Lie c a Department of Mathematical Sciences, Norwegian University of Science and Technology, N-7491 Trondheim, Norway E-mail: [email protected] b Department of Mathematics, University of Bergen, Johs. Brunsgt. 12, N-5008 Bergen, Norway E-mail: [email protected] c Department of Informatics, University of Oslo, P.O. Box 1080 Blinde...

Terrestrial runoff and sedimentation have been implicated in a variety of impacts on scleractinian corals. However, despite accumulating evidence, little work has been done to investigate their influence on coral disease development. This study examined the role that river runoff and the associated sedimentation could play in affecting the prevalence of the coral disease "white syndrome" in SW ...

Dams are important reservoirs in semiarid regions providing the needs of population and agricultural activities an area which intermittent rivers predominate. These subject to erosion processes that can cause sedimentation affect quality water them. The method dating sediments using 210Pb is well known used establish a precise chronology places where abrupt changes conditions do not occur. work...

The sedimentation rate (dated by 210Pb), sediment characteristics, pollution, and polymetallic (Cd, Pb, Zn, As, Hg) record were studied from two reservoirs (Maoshui Reservoir Lexi Reservoir), which are located in the zinc smelting area of Weining County, Guizhou Province, China. results showed that Maoshui reservoir is mainly polluted Cd, with average concentrations 53, 84, 2108 mg/kg, respecti...