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Monday, July 20, 2020 | History

2 edition of Soil erosion and reservoir sedimentation in Lesotho found in the catalog.

Soil erosion and reservoir sedimentation in Lesotho

Qalabane K. Chakela

Soil erosion and reservoir sedimentation in Lesotho

by Qalabane K. Chakela

  • 119 Want to read
  • 34 Currently reading

Published by Scandinavian Institute of African Studies in Uppsala .
Written in English

    Subjects:
  • Reservoir sedimentation -- Lesotho.,
  • Soil erosion -- Lesotho.

  • Edition Notes

    StatementQalabane K. Chakela.
    SeriesUNGI rapport -- 54
    ContributionsNordiska Africainstitutet.
    Classifications
    LC ClassificationsS"625"L5"C42
    The Physical Object
    Pagination150 p. :
    Number of Pages150
    ID Numbers
    Open LibraryOL20153122M

    Soil Erosion and Sediment Flux in Northern Jordan: Analysis, Quantification and the Respective Qualitative Impacts on a Reservoir Using a Multiple Response Approach (Springer Theses) [Kraushaar, Sabine] on *FREE* shipping on qualifying offers. Soil Erosion and Sediment Flux in Northern Jordan: Analysis, Quantification and the Respective Qualitative Impacts on a Reservoir Format: Hardcover. Human Impact on Erosion and Sedimentation (Proceedings of the Rabat Symposium, April ). IAHS Publ. no. , Soil erosion and reservoir sedimentation in the High Atlas Mountains, southern Morocco H. R. FOX, H. M. MOORE, J. P. NEWELL PRICE Centre for Land Evaluation and Management, Division of Geography, School of.

    • The soil erosion processes, prevention, and control are described in Part I that includes chapters on surface erosion, gully erosion, and soil mass movement. • The focus of Part II is placed on sediment supply, transport, and outflows and consists of chapters on sediment sources and its transport in a stream; and the sediment yield from a. erosion/sedimentation system. EROSION AND SEDIMENTATION IN FIVE CATCHMENTS IN SEMI-ARID TANZANIA Man-made and natural lakes act as sediment traps and store part of the material eroded and transported by run-ning water from the catchment. In semi-arid areas, streams flow only occasionally and the flow of water and sediment is difficult to measure.

    The rate of decline of Cs activity toward the surface of the sediment deposited in a lake or reservoir can be used to estimate the rate of surface lowering associated with eroding areas within the upstream catchment, and the concentration of Cs in recently deposited sediment provides a basis for estimating the relative importance of. The estimated costs of soil erosion vary from the 5 dollars spent to remove each ton of sediment to keep navigation activities in operation, to billion dollars a year in the European Union, spent to offset the effects brought about by the loss of soil fertility and sedimentation of water resources.


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Soil erosion and reservoir sedimentation in Lesotho by Qalabane K. Chakela Download PDF EPUB FB2

Soil Erosion and Reservoir Sedimentation in Lesotho on *FREE* shipping on qualifying offers. Soil Erosion and Reservoir Sedimentation in LesothoFormat: Paperback. Get this from a library.

Soil erosion and reservoir sedimentation in Lesotho. [Qalabane K Chakela]. Get this from a library. Soil erosion and reservoir sedimentation in Lesotho. [Qalabane K Chakela; Nordiska Afrikainstitutet.].

Soil Erosion and Reservoir Sedimentation in Lesotho. Nordic Africa Institute. Elizabeth A. Eldredge. A South African Kingdom: The Pursuit of Security in Nineteenth-Century Lesotho.

Cambridge University Press. Elizabeth A. Eldredge. Power in Colonial Africa: Conflict and Discourse in Lesotho, University of. Soil erosion and reservoir sedimentation in Lesotho [Roma Valley, Maliele catchments, water and sediment discharge, geomorphology, land resources, Khomo-khoana] [] Chakela, Q.K.

Uppsala Univ. (Sweden) [Corporate Author]Author: Q.K. Chakela. 1. Introduction. Lesotho (also known as the water tower of Africa) is a country for which water is one of its greatest assets; unfortunately it has also come to be known as a country with one of the highest rates of soil erosion in the world (Showers, ), and the associated high rates of loss of reservoirs storage capacities due to sediment deposition (Chakela, ).

Soil erosion and sedimentation may not only cause on-site degradation of the natural resource base, but also off-site problems— downstream sediment deposition in fields, floodplains and water bodies, water pollution, eutrophication and reservoir siltation.

Soil conservation is defined as the control of soil erosion in order to maintain agricultural productivity. Soil erosion is often the effect of many natural causes, such as water and wind.

Book Detail: Soil and Water Conservation Engineering Language: English. Pages:. Author: N.A; Publisher: Government Printing Office ISBN: Category: Electronic government information Page: View: DOWNLOAD NOW» NOTE: NO FURTHER DISCOUNT FOR THIS PRINT PRODUCT--OVERSTOCK SALE --Significantly reduced list price while supplies last The Erosion and Sedimentation Manual provides a comprehensive coverage of subjects in nine.

1. Introduction. Soil erosion is likely the most common form of land degradation worldwide (Bridges and Oldeman, ).In South Africa, large areas (85% of land) is vulnerable to soil erosion (Van Rensburg, ), with more than 70% of the country already affected by varying intensities of soil erosion (Garland et al., ).The estimated soil erosion rates average at more than 3.

a) Example of heavy sedimentation in the Cachí reservoir, Costa Rica, caused by a combination of turbidity currents, delta propagation and direct sediment production from the reservoir banks; (b. This book combines new quantitative erosion measurement methods with a geochemical fingerprint and a model-based approach to measure erosion and sediment flux in the Wadi Al-Arab, a Mediterranean to semi-arid catchment in northwest Jordan.

The outcomes reveal the local importance of soil erosion. Case studies of reservoir sedimentation as a consequence of soil erosion V. Hrissanthou. The impact of flow transformations and reservoir floor topography on reservoir deposition patterns in high energy environments F.

Weirich. Reservoir sedimentation and erosion processes in a snow-influenced basin in Southern Spain. Sedimentation is an important parameter to assess the life of a reservoir. Seventy-eight years ago, Cook was the first to identify mathematically, the three major factors affecting soil erosion in the catchment of a reservoir.

As sedimentation is dependent on sediment yield and sediment yield depends on soil erosion, it is required to predict all three parameters to estimate the life of a. Sediment will eventually fill a reservoir within 50– years.

Here, the crucial point is the fact that reservoir sedimentation is just a symptom of erosion of the topsoil. The principal causes are anthropogenic activities such as deforestation, and overgrazing.

The storage loss due to reservoir sedimentation has been found to exceed the storage added worldwide by the mid s. Recovery of this lost storage is estimated to range between US$ 10 billion and US$ 20 billion per year, not accounting for the growth in world population.

In this book, Professor Julien provides a thorough analysis of erosion, transport and sedimentation of soil and solid particles by surface waters. The author stresses physical understanding based on Newtonian mechanics, and explains fundamental concepts pertaining to the hydrodynamic forces exerted on solid particles, with a lucid treatment of potential flow, viscous flow, turbulent flow, and.

Fox et al. () present a review and research perspectives on mid-reach sediment production contributing to reservoir sedimentation, namely about rill, gully and stream bank erosion. This paper discusses the suspended sediment data collected in Lesotho during the period The drainage areas of the measuring sites vary between and 20 km.

The results demonstrate that annual suspended sediment yields range from less than 10 t km in the igneous region to more than t km in the sedimentary region. Sediment production rates in the basaltic region are mainly.

Soil erosion and water deficiency are some of the most serious problems in many developing countries including Lesotho. In Lesotho the problem of soil erosion by water and to a less degree by wind has become so serious that large parts of the country are rapidly loosing productivity due to loss of soil fertility by sheet erosion on cultivated.

(). Targeting of intervention areas to reduce reservoir sedimentation in the Tana catchment (Kenya) using SWAT. Hydrological Sciences Journal: Vol. 58, No. 3, pp. Rill erosion refers to the development of small, ephemeral concentrated flow paths which function as both sediment source and sediment delivery systems for erosion on hillslopes.

Generally, where water erosion rates on disturbed upland areas are greatest, rills are active. Flow depths in rills are typically of the order of a few centimeters (about an inch) or less and along-channel slopes may.Abstract. Soil erosion and water deficiency are some of the most serious problems in many developing countries including Lesotho.

In Lesotho the problem of soil erosion by water and to a less degree by wind has become so serious that large parts of the country are rapidly loosing productivity due to loss of soil fertility by sheet erosion on cultivated lands; loss of arable and range lands.