Show simple item record Dilrukshi, YDNM Wijayaratna, TMN
dc.contributor.editor Mallikarachchi, C 2023-01-25T08:17:14Z 2023-01-25T08:17:14Z 2022-12
dc.identifier.citation ****** en_US
dc.description.abstract River discharge is primarily related to water resource management because it is an important event in the global water cycle. The hydrological processes within a catchment are influenced by land usage, land cover, soil properties, and climate. These factors must be considered when calculating accurate river discharges. This study assessed the seasonal variation of freshwater outflow over 20 years from the Gin, and Nilwala River basins using a rainfall-run-off model developed based on Rainfall-Runoff-Inundation (RRI) software. Daily precipitation, streamflow, pan evaporation, and topography data were used to develop, calibrate, and carry out model runs. Manning's roughness coefficient for the river (nr) and the slop (ns), soil depth, saturated hydraulic conductivity (ka), and vertical infiltration (ksv) were the calibration parameters of the RRI Model. In addition, deviation of runoff volume (DV), Nash Sutcliffe, Pearson correlation coefficient (R), and root-mean-square error (RMSE) were performed as objective functions in comparing the observed and simulated discharge for the calibration and validation of the model. Because the model cannot predict the sudden peak flow, the model flow upstream does not simulate well with the observed flow, yet the overall model performs well in the calibration and validation process in both catchments. The Monthly, seasonal, and annual trends of both river basins were analysed from 2001 to 2020. The non-parametric Mann-Kendall approach was used to assess the statistical significance of any positive or negative trends in freshwater discharge. The freshwater outflow increased significantly in June, August, and September in Gin River while the Nilwala river had a significant increasing trend in August and September. While the Nilwala river had a substantial growing trend in the first inter-monsoon, the freshwater output in the Gin River increased significantly during the Southwest monsoon. Besides, neither river's yearly outflow showed any discernible trends. The RRI model is suitable for analysing the total discharge to the sea since inundation is also considered. en_US
dc.language.iso en en_US
dc.publisher Department of Civil Engineering, Faculty of Engineering, University of Moratuwa en_US
dc.subject Freshwater Outflow Variation en_US
dc.subject Gin River Basin en_US
dc.subject Nilwala River basin en_US
dc.subject RRI model en_US
dc.subject Trend Analysis en_US
dc.title Seasonal freshwater outflow variation of gin and Nilwala river basins en_US
dc.type Conference-Abstract en_US
dc.identifier.faculty Engineering en_US
dc.identifier.department Department of Civil Engineering en_US
dc.identifier.year 2022 en_US
dc.identifier.conference Civil Engineering Research Symposium 2021 en_US Katubedda en_US
dc.identifier.pgnos p. 59 en_US
dc.identifier.proceeding Proceedings of the Civil Engineering Research Symposium 2022 en_US en_US

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  • CERS - 2022 [36]
    Civil Engineering Research Symposium 2022

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