AGGREGATION OF EVAPOTRANSPIRATION SPACE WEATHER SEMIÁRIDOAuthor:
WERE EDUARDO ANA.
Year:
2004.
University:
ALMERÍA [
www.ual.es].
Place of defense: DEPARTAMENTO DE BIOLOGÍA VEGETAL Y ECOLOGÍA FACULTAD DE CIENCIAS EXPERIMENTALES.
Place of preparation: ESTACIÓN EXPERIMENTAL DE ZONAS ARIDAS.
Summary: In this Doctoral Thesis been implemented various methods of spatial aggregation of evapotranspiration a heterogeneous area with various toppings plant in a semi-arid climate. On the one hand, it has applied a method of spatial aggregation of evapotranspiration hand knowledge of the flows of individual coverage in the area, promediándolas according to the fraction of each contribution. To calculate fraction of this contribution has been used two methods: one that allows empirical calculate statistically fraction of this contribution; another part of the theoretical knowledge of the source area or "footprint" of the sensor that measures the total flow of heterogeneous area, so and fractional contribution corresponds to the fraction of each coverage area within the source. On the other hand, it has applied a method of spatial aggregation of evapotranspiration hand knowledge of a number of parameters and variables, both at the level of each of the coverages including as a wide area heterogeneous. This party has a sparse vegetation model, adapting to a heterogeneous area, taking into account the height of the mixture interacting different coverages called "blending height", and taking into account the actual parameters of the area. Within the latter, the most important are the effective resistances of each of the coverages, which compared different methods to calculate them. Evapotranspiration aggregate values obtained with both methods were contrasted with measures instrumental evapotranspiration. Therefore, this Doctoral Thesis has permitted various theoretical approaches to aggregation space evapotranspiration area heterogeneous and contrast the results with a comprehensive package of evapotranspiration instrumental in semiarid climate.
