Siltation

About: Siltation is a research topic. Over the lifetime, 1420 publications have been published within this topic receiving 20983 citations.

Acoustic Measurements of Suspended Sediments in Estuaries

Abstract: Sediment flux measurements are essential for estimating the environmental impact of erosion and depositional processes. In the coastal areas, sediment measurements are required to assess siltation of backwaters, sandbar formation across mouths of rivers, accretion and erosion of coastline from coastal structures, impacts of dredging operations, watershed loadings into the coastal zone and fate and transport of toxic chemicals. Sediments play a significant role in defining the interrelationships between the physical, chemical, biological and environmental factors. In rivers, lakes and estuaries, sediment is an important water quality indicator, not only as a pollutant but also as a transport or catalytic agent for other forms of pollution, especially toxics. The feasibility of measuring sediment loads over the entire cross-section in open channel flows, in particular estuaries, using acoustic measurements was studied.

Soil loss in developing countries and its relationship to marine resources: Examples from east africa

Abstract: The direct economic and social effects of soil loss in developing countries are generally recognized. Massive upland soil erosion also, however, affects coastal and marine systems through sediment transported by major rivers. Such sedimentation can affect a range of human activities, including coastal lifestyles, fishing, and maritime and tourist development. East Africa sustains high rates of soil loss due to human subsistence activities, and major changes are observable and predictable in coastal natural systems. The viability and effects of major dam projects in relation to siltation are of special concern. These factors call for improved monitoring and assessment of the effects of coastal sedimentation as well as serious nation-wide campaigns to reform rural subsistence living practices and implement forest, soil, and rangeland conservation programs.

Studies on geo-morphology, ecology and fish production of the 92 rivers of Rajshahi Division, Bangladesh

Abstract: Geo-morphology, ecology and fish production of the 92 rivers of Rajshahi division have been presented in this paper. Fifteen rivers are dead and 11 rivers have severe erosion problem. Siltation has increased in 66 rivers and depth has decreased in 11 rivers. Sixty nine rivers are suffering from low flow conditions. Fish diversity has decreased in 20 rivers while fish production has declined in 75 rivers. A total of 31 fish species have extinct, 25 species are under threat of extinction and 43 species have low production. Siltation and pollution are the major causes of fish habitat loss. Recommendations are made to protect and conserve fish habitat and riverine fisheries of Rajshahi division.

Research Method of Silting the Mountain Reservoirs Under the Current Climate Change

Abstract: The mountain reservoirs are an accumulator of the processing products of river banks and sediments. These elements form the silting prism and its bench, which are located in the reservoir and the riverbeds of the tributaries. As a result, there is increased riverbeds and there are a number of catastrophic flooding risk and deficit of the beach-forming sediment on the sea coast. The aim of our research is the estimation of accumulation of solid material in the reservoirs and tributaries, as well as a change of channel processes. In order to study the sedimentation prism-formation and equilibrium bad processes, the method of field experiment is proposed, which was used in the mountain reservoirs of Georgia. For analysis of obtained results were used the methods of mathematical statistics - least square method and differential calculus. The experiment showed that the final result of the reservoirs' silting is an accumulative terrace, which produced an equilibrium alluvial bed. Fractional distribution of sediments in silting prism is determined by reservoir control type and intra-annual distribution of fluvial sediments. The network of sediment extraction quarries has to be located along the reservoir taking into account this principle.

Study on deposition characteristics and channel siltation in offshore zone of Qinzhou Bay

Abstract: From analysis of dynamic property,deposition characteristics,sources of the sediment and its transport trends,sediment conditions and siltation status after the development of East Channel,it's concluded that sediment is not large in Outer Qinzhou Bay,silt content in the sea water is slight,riffle and pool is in stable stateEast Channel axial line is basically coinsident with the direction of flood current,and the siltation after channel's excavation will not be heavy