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Title

Development of water balance model of Doñana marshes using remote sensing determination of their flood extent

AuthorsBeltrán Miralles, Manuel
Issue Date20-Mar-2013
AbstractThe Doñana Biological Station monitors the flood extent of Doñana marshes, in Southwestern Spain, using Landsat images. These data have been used to develop different models that permit simulation of the variation in the flood extent in the marshes throughout the hydrologic year, the models being based on a daily balance of water inputs and outputs. Five different models were developed using data for the period 1994-2004. Direct precipitation and evaporation were estimated using climate data. The absorption of water by the marshes at the beginning of the hydrologic year (Absmax) was calibrated in one model (model A) and estimated in the others (models B- 156, B-420, C-156 and C-420). River flow inputs were modeled using a conceptual rainfall-runoff model (Témez model). The Témez model parameters were calibrated in two models (B-156 and B-420) without using runoff records. River flow inputs in the other models were estimated using runoff parameters from a nearby catchment (the Meca River) for model A and not considered for models C-156 and C-420. The goodness of fit of the models was assessed using a weighted R2 (wR2). The analyses indicate that the calibration of the Témez model without using runoff records does not provide the best results, although it must be possible to obtain reasonable results with a longer and more homogeneous period of study. The use of Témez model parameters calibrated for the Meca River catchment does not permit an accurate calibration of Absmax. In addition, the analyses indicate that it is possible to develop a model with a high goodness of fit using data from a single meteorological station located in the marshes (station 5858) and considering runoff as null, although further analyses are required to asses how this model would simulate the different phases of the hydrologic cycle of the marshes.
URIhttp://hdl.handle.net/10261/72479
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