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Accueil du site → Doctorat → Espagne → 1995 → Modelo para la estimacion de las disponibilidades hidricas en ladera

Universidad Politecnica de Madrid (1995)

Modelo para la estimacion de las disponibilidades hidricas en ladera

Martinez De Azagra, Andres

Titre : Modelo para la estimacion de las disponibilidades hidricas en ladera

Auteur : Martinez De Azagra, Andres (Manuel)

Université de soutenance : Universidad Politecnica de Madrid

Grade : Doctor of Philosophy (PhD) 1995

Résumé
A mathematical model to quantify the infiltration in a slope (i.e. the availability of water in an ecosystem from the standpoint of its surface hydrology) is developed in this study. To that fact a new local water balance is worked out. For the design of water harvesting structures ensuring a successful afforestation of arid lands (microcatchments, ridging, terracing), the concept of primary systematization is developed. This term refers to a unit area with two markedly different sections : one exporting surface run-off and the other collecting surface run-off by means of an appropriately sized micro-pond receiving the excess water. At the core of this study lies the application of the local water balance both to the original (degraded) slope and to the systematized slope separating run-off producing from run-off collecting areas. The equations generated through this analysis make possible to simulate the hydrological behaviour of any sloping land and to quantify the available water under different conditions and at specific points of an area intended for afforestation. This, no doubt, should be of help in the rehabilitation of some of our degraded fields and woodlands ravaged by a severe process of decertification. To assist in the use of these equations, they are spelled out with particular reference to two of the most common models in hydrology : Horton’s infiltration equation and the curve number method. The resulting system of equations—fairly lengthy and elaborate in both cases—made computerization advisible. Thus, two programmes, HYDNUM and MODIPE, with their accompanying user’s manuals have been developed. The final part of the study is taken up by several practical examples which show how to run the programmes as well as their potential usefulness. A final word is given on the avenues opened for further research to be pursued in the near future.

Mots clés : water availability, runoff, Hydrology, Earth sciences

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