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Trend analysis of rainfall characteristics and its impact on stormwater runoff quality from urban and agricultural catchment

  • Salim, Imran (Department of Environmental Engineering and Energy, Myongji University) ;
  • Paule-Mercado, Ma. Cristina (Department of Environmental Engineering and Energy, Myongji University) ;
  • Sajjad, Raja Umer (Department of Environmental Science, COMSATS University Islamabad, Abbottabad Campus) ;
  • Memon, Sheeraz Ahmed (Institute of Environmental Engineering and Management, Mehran University of Engineering and Technology) ;
  • Lee, Bum-Yeon (Department of Environmental Engineering and Energy, Myongji University) ;
  • Sukhbaatar, Chinzorig (Institute of Geography and Geoecology) ;
  • Lee, Chang-Hee (Department of Environmental Engineering and Energy, Myongji University)
  • Received : 2018.05.07
  • Accepted : 2018.08.28
  • Published : 2019.01.25
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Abstract

Climate change has significantly affected the rainfall characteristics which can influence the pollutant build-up and wash-off patterns from the catchment. Therefore, this study explored the influence of varying rainfall characteristics on urban and agricultural runoff pollutant export using statistical approaches. For this purpose, Mann-Kendall and Pettitt's test were applied to detect the trend and breakpoint in rainfall characteristics time series. In addition, double mass curve and correlation analysis were used to drive the relationship between rainfall-runoff and pollutant exports from both catchments. The results indicate a significant decreased in total rainfall and average rainfall intensity, while a significant increased trend for antecedents dry days and total storm duration over the study periods. The breakpoint was determined to be 2013 which shows remarkable trend shifts for total rainfall, average rainfall intensity and antecedents dry days except total duration. Double mass curve exhibited a straight line with significant rainfall-runoff relationship indicates a climate change effect on both sites. Overall, higher pollutant exports were observed at both sites during the baseline period as compared to change periods. In agricultural site, most of the pollutants exhibited significant (p< 0.05) association with total rainfall, average rainfall intensity and total storm duration. In contrast, pollutants from urban site significantly correlated with antecedent dry days and average rainfall intensity. Thus, total rainfall, average rainfall intensity and total duration were the significant factors for the agricultural catchment while, antecedents dry days and average rainfall intensity were key factors in build-up and wash-off from the urban catchment.

Keywords

Acknowledgement

Grant : Development of integrated estuarine management system

Supported by : Korea Environmental Technology and Industrial Institute, Ministry of Oceans and Fisheries

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