Abstract
High-intensity rainfall can raise fluvial channel levels, increasing the risk of flooding. Maximum precipitation depths are used to estimate return periods and, thus, calculate the risk of this type of event. To improve these estimates in Southwest Europe, we studied the behavior of extreme rainfall using the historical records of San Fernando (Cádiz, southwest Spain), obtaining the maximum daily annual rainfall (period 1851–2021). Local risk levels for intense precipitation were established based on the mean values and standard deviation of daily precipitation. In this series, 38% of the years had some type of risk (>53.7 mm), of which 13% of these years had high risk (>73.2 mm) or disaster risk (>92.7 mm). In these risk thresholds, the maximum daily precipitation is mostly concentrated in the autumn months. The SQRT-ETMax model used fits well with the instrumental historical records for return periods of up to 25 years, although it may present appreciable deviations for longer return periods. Using a 170-year secular series, a more precise understanding of extreme periods and precipitation variability was obtained.
Subject
Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry
Reference81 articles.
1. Evolution of annual rainfall irregularity in the southwest of the Iberian Peninsula
2. Drought Trends in the Iberian Peninsula over the Last 112 Years
3. Evolución de la variabilidad pluviométrica en Andalucía occidental: Su repercusión en la gestión de los recursos hídricos;Aguilar-Alba,1996
4. Institutional adaptation to changing risk of water scarcity in the lower Guadalquivir basin;Giansante;Nat. Resour. J.,2002