Abstract
The present research work reveals the mean annual rainfall of Barishal is 2087.34 mm for the investigated period. The maximum annual rainfall was 3390 mm in the year of 1960 and minimum annual rainfall was recorded as 1277 mm in the year of 1964. The annual rainfall is inversely correlated with time. The maximum monthly rainfall is recorded in the month of July. The amount of annual rainfall is strongly significantly positively correlated with the monthly rainfall of May, June, July, August and September. In Barishal, the value of skewness for all rainfall data are positive that indicate the data are skewed to the right. The positive value of kurtosis of the eleven months of the year (except July) means a peaked distribution and a negative value in the month of July reveals the flat distribution with the same mean and standard deviation. The annual PCI value is inversely proportional to the annual rainfall. The analyses of seasonal precipitation concentration index (SPCI) reveals that the rainfall is uniformly distributed in summer monsoon whereas the winter rainfall shows the dominance of strong irregularity in precipitation distribution. Â
Highlights
Precipitation directly influence the water availability of an area and it is one of the most important climatic and hydrological parameters (De Luis et al 2011)
The annual precipitation concentration index (PCI) value is inversely proportional to the annual rainfall (Figure 4)
The analyses of seasonal precipitation concentration index (SPCI) reveals that the rainfall is uniformly distributed in summer monsoon whereas the winter rainfall shows the dominance of strong irregularity precipitation distribution
Summary
Precipitation directly influence the water availability of an area and it is one of the most important climatic and hydrological parameters (De Luis et al 2011). In tropical areas rainfall is the main form of precipitation. The study area lies in Barishal district, which is in the southern part of Bangladesh. The rivers are tidal is nature (Saha et al.2020; Moniruzzaman et al 2016). The main rivers of Barishal are the Meghna, Kirtonkhola, Jayanti etc. The surface geology is principally composed of sand, silt and clay of either estuarine or deltaic origin of Quaternary age. The clay particles mainly composed of illite, kaolinite, chlorite, quartz and feldspars (Saha et al 2020)
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