Showing papers on "Siltation published in 1982"

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.

Erosion control at a delicate highway construction site

Abstract: The authors describe how stream planning of a road under construction in Oregon was protected from siltation, sedimentation and pollution during construction.

Siltation in Zoo Negara Lake

Abstract: In a study of Zoo Negara Lake, it was found that the turbidity and total residues were higher in the lake than in the upstream station where there is no effect of soil erosion. The immediate results of massive flows of erosion silt were the change of water colour and reduction in the depth of the lake. Effects of siltation such as the reduction in light penetration and aquatic organisms are discussed.