Resumen

CASTIGLIONI, MARIO GUILLERMO  y  ZIMMERMANN, ERIK. ESCURRIMIENTO EN SISTEMA DE SIEMBRA DIRECTA: EFECTO DE ALGUNOS FACTORES METEOROLÓGICOS. Cienc. suelo [online]. 2015, vol.33, n.1. ISSN 1850-2067.

Surface runoff should be taken into account not only for its impact on the environment but also for its effect on crop production. Surface runoff should be evaluated at the field scale; the objective of this study was to evaluate rainfall, temperature and other seasonal effects on runoff characteristics of a vertic Argiudol under no-tillage. The study was conducted in a corn field under no-tillage in Zavalla, Santa Fe, Argentina (33°02'14.84"S, 60°54'04.40"O). With the rainfall information (amount, duration, intensity and previous rainfall), temperatures (maximum and average daily), runoff (amount, duration and peak flow) and some estimated parameters (curve number, previous moisture condition, lag time and initial abstraction and runoff coefficients) the association among the different climatic and runoff variables was studied. A strong relationship was observed between rainfall the previous five days and the curve number value, runoff depth and runoff coefficient. Ten day= previous rainfall influenced the initial abstraction coefficient, increasing its value with previous rainfall greater than 40 mm. Rainfall and maximum or average temperatures of ten to fifteen days previous rainfall impacted on the delay time extent (Lag). When rainfall excess was estimated taking into account the field initial abstraction, runoff dynamics and peak flow were more satisfactory predicted compared to the results obtained with the traditional methodology used by the curve number model. Seasonal effects and corn growth stages (fallow or growing period) did not affect the hydrological plot response.

Palabras clave : Antecedent rainfall, initial abstraction, lag time.

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