This paper deals with the application of satellite images to characterize some aspects of the circulation dynamics of the Tinto-Odiel estuary using turbidity patterns as ‘natural tracers’. 15 images (Landsat TM and Spot HRV) were processed to provide synoptic, instantaneous views of the circulation patterns under different environmental conditions. In addition, a comparison was made between results of oceanographic field work, using biplanes and fluorescent tracers, and satellite image turbidity patterns used as ‘ground truth’ data for specific hydroclimatic situations. This approach allowed (1) the identification and mapping of dynamic processes of interest during a theoretical tidal cycle, (2) the elaboration of additional information on the ‘flow schemes’ at the mouth of the estuary with improved spatial and temporal resolution, and (3) the supply of basic data to improve the knowledge of exchange processes between estuarine and coastal waters. The results of this study are considered to be useful for the management of the estuarine system
En las marismas del Bajo Guadalquivir, en la provincia de Sevilla hay destinadas al cultivo de arroz unas 35.500 ha. El periodo de este cultivo abarca desde finales de abril hasta septiembre u octubre (Aguilar, 2001) y las tablas son colonizadas por diversos insectos acuáticos los cuales están normalmente asociados con otros hábitats acuáticos temporales (Usinger, 1956;Zalom, 1981). Debido a que estudios en otros agro-ecosistemas muestran que la abundancia y estructura de la comunidad de los insectos puede variar dependiendo de las labores que se practiquen en el cultivo (Dritschilo & Wanner, 1980;Madsen & Madsen, 1982;Hesler et al., 1993), en el presente trabajo hemos seguido la evolución de las poblaciones de insectos a nivel taxonómico de familia de una tablas de arroz (tanto cualitativa como cuantitativamente).En las marismas del Bajo Guadalquivir el cultivo de arroz se realiza, de forma característica, en un flujo continuo de agua. Mediante este sistema se mantiene el agua oxigenada y permanece con temperaturas suaves, entre 20 y 25 ºC. Las labores agrícolas que se practican son las
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