In this study, the spatial variation of daily and monthly concentration precipitation index and its aggressiveness were used in 23 rainfall stations in the extreme north-east of Algeria over the period 1970–2010. The trend was analysed by the Mann–Kendall (MK) test. The results show that daily precipitation concentration index (CI) values are noticeably higher in places where the amount of total precipitation is low, the results of MK test show that areas of high precipitation concentration tend to increase. The seasonality and aggressiveness of precipitation are high in the eastern and western parts of the study region (eastern and central coastal of Constantine catchments), whereas a moderately seasonal distribution with low aggressiveness is found in the middle of the study area (plains and central Seybouse catchment). As a result, the modified Fournier index (MFI) has a significant correlation with annual precipitation, whereas the CI and monthly precipitation concentration index (PCI) show an opposite correlation in relation to annual precipitation.
This work presents a study of variability and trends of extreme precipitation events in northeast Algeria using a high-resolution gridded dataset. To this end, 10 extreme precipitation indices were computed over a daily gridded precipitation dataset with a spatial resolution of 1x1 km from 33 series of weather observatories, covering the period from 1970 to 2010. The processes involving the reconstruction of the missing data and gridding were applied based on the approach of creating reference values (RV), allowing for a comprehensive quality control of the original data while reporting and deleting suspicious values that do not correspond to the natural spatial and temporal distribution of daily precipitation. These RV were used to complete a reconstructed dataset without missing values, based on the cleaned data series. Then, it was used to create the high-resolution gridded dataset over northeast Algeria. In view of the obtained results, a general increasing gradient of the extreme precipitation indices from south to north was noted, particularly at the coast and at highaltitude regions. Furthermore, upward trends in extreme intensity and frequency precipitation indices, such as PRCPTOT, SDII, RX1day, RX5day, R10mm, R20mm, CWD, R95p, and R99p were observed, except for the consecutive dry days (CDD) index, which showed a remarkable decrease. However, most of the estimated trends were not statistically significant at .05 levels.
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