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Accueil du site → Doctorat → Royaume-Uni → 1991 → Land surface response to rainfall in semi-arid systems : determinations from experiments using simulated rainfall in the Lowveld of Swaziland

University of Oxford (1991)

Land surface response to rainfall in semi-arid systems : determinations from experiments using simulated rainfall in the Lowveld of Swaziland

Bowyer-Bower, Tanya A S.

Titre : Land surface response to rainfall in semi-arid systems : determinations from experiments using simulated rainfall in the Lowveld of Swaziland.

Auteur : Bowyer-Bower, Tanya A S.

Université de soutenance : University of Oxford

Grade : Doctor of Philosophy (Ph.D.) : 1991

Résumé
In order to investigate details of land surface response to rainfall in semi-arid systems, a series of experiments was carried out in the Lowveld of Swaziland. Following a review of the use of rainfall simulators for this type of research a drip-type simulator was designed and adopted. The emphasis of the research was upon the soil surface control of the hydrological and sedimentological response of soil to rainfall ; and the effect of antecedent moisture and rainfall intensity was also targeted. Rainfall intensities between 10 mm hr-1 and 120 mm hr-1 were used, as well as wet and dry antecedent moisture conditions. Experiments were carried out on seven soil types in both degraded and nondegraded conditions in the Lowveld area. Processes of infiltration, runoff production, and sediment movement in rainsplash and runoff were monitored and analysed. A main finding from the results was a confirmation and detailing of the control of both the hydrological and sedimentological responses by just the surface layer of the soil for all conditions included in the research design. A notable feature of this was a variable dependence of the final steady state infiltration rate (fc) upon rainfall intensity and antecedent moisture. The research also demonstrated the need for standardising rainfall simulation designs, if the results of a project of this kind are to be maximised.

Mots clés : : Soil Science & pedology Soil science Hydrology Geography

Annonce : EThOS (UK)

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