Hydrological Characteristics Analysis of Surma River in Northeastern Bangladesh: A Quantitative Approach
Islam, Md. Saiful
Sikder, Md. Bahuddin
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Abstract: This article presents the quantitative analysis of hydrological characteristics of the Surma River in northeastern Bangladesh. Time series data from two hydrologic gauging stations named Kanaighat and Sylhet have been studied. Two kinds of data series, annual mean flow and annual peak discharge, have been considered for analysis. The basic hydro-characteristics, including arithmetic mean, variability, skewness, distribution type, persistence, dependence, trend, and correlation have been studied through various statistical methods, including coefficient of variation, skewness, Kolmogorov-Smirnov test, lag-1 serial correlation, Mann-Kendall test, Sen’s slope estimator, and Pearson’s coefficient of correlation. Results revealed that, annual mean flow is more consistent at Kanaighat than Sylhet. Peak discharge at both stations shows a low degree of variation. Distributions of peak discharge and mean flow are positively skewed at two stations. Presence of serial correlations in annual mean flow at both stations is statistically not significant. Both the annual mean flow and peak discharge have a downward trend at two stations. Trends at Kanaighat are insignificant, while trends at Sylhet are significant. Annual mean flows at the two stations are highly correlated to each other. The findings of the study express the current status of river and provide guidance for maintenance of surface water resources.