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Accueil du site → Doctorat → États-Unis → 1973 → DESIGN OF A SYSTEM FOR PREDICTING EFFECTS OF VEGETATION MANIPULATION ON WATER YIELD IN THE SALT-VERDE BASIN

University of Arizona (1973)

DESIGN OF A SYSTEM FOR PREDICTING EFFECTS OF VEGETATION MANIPULATION ON WATER YIELD IN THE SALT-VERDE BASIN

Rogers, James Joseph

Titre : DESIGN OF A SYSTEM FOR PREDICTING EFFECTS OF VEGETATION MANIPULATION ON WATER YIELD IN THE SALT-VERDE BASIN

Auteur : Rogers, James Joseph

Université de soutenance : University of Arizona

Grade : Doctor of Philosophy (PhD) 1973

Résumé
There is a definite need for embedding the processes of model development, implementation, testing, and choice within a common mathematical framework. Although mathe matical system theory is not well known, it seems to provide such a framework. The methodology of mathematical system theory is used here to develop, implement, and test a model of the hydrologic behavior of a managed natural ecosystem. The model is defined as a mathematical system con sisting of four coupled components for : (1) ecosystem description, (2) ecosystem climate, (3) treatment effects on soil and vegetation, and (4) water and energy balance. It is assumed that an ecosystem may be divided into a set of homogeneous units and that the coupling between the units for flow routing can be determined. The model estimates the radiation and radiation balance on each unit. Any number of climatic stations may be used and the model adjusts climatic inputs to each unit. Major processes modelled include those affecting canopy interception, snow pack water and energy balance, mulch layer water balance, surface water balance and overland flow routing, evapotranspiration, soil water balance and interflow including routing, and channel routing. These balances are carried on each unit. When a treatment is input in the form of a new vegetation description, the model estimates the effects on soil and vegetation parameters affecting the water balance. The change in these parameters with time is also modelled. A computer program for implementing the model was developed and is given together with instructions for its use. A procedure for developing the required input data is also briefly outlined* The model was not calibrated, although it is possible that it could be calibrated.

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