Research Publications
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Publication Embargo Investigation of long-term river water quality variations using different urbanization indices and assessment of common scientific perspectives of urbanization on water quality(wiley, 2023-03) Karunatilaka, P. D.; Gomes, P. I. AThis study investigated the water quality variation spanning 30 years (1986–2017) in 16 catchments of Hong Kong against different urbanization indices, namely, built area fraction; population; and product of population and built area fraction. Pearson correlations of three different periods of time (1988–1990, 1998–2000, and 2015–2017) indicated that water quality trends were dependent on the urbanization index. Total solids, nitrite-nitrogen, total phosphorus, electrical conductivity, dissolved oxygen, and flow rate had significant deteriorative trends (Pearson r > 0.5 and p < 0.05) with population and product of built area and population. Results also interpreted that built area fraction and product of built area and population were the worst and best indices that represented urbanization and/or its impacts, respectively. Mann-Kendall test for the entire 30 year period showed that water quality had improved with time with respect to certain water quality parameters (e.g., dissolved oxygen, ammoniacal nitrogen and total suspended solids). The results portrayed that although the urbanization of catchments had increased with time, the river water quality with respect to many parameters showed signs of improvement and the legislative measures implemented seemed to be effective in controlling pollution.Publication Open Access Assessing the Effectiveness of Curbside Pickup Process in Sri Lankan Restaurant Industry(Emerald Publishing, 2022-12-01) Godakumbura, K. E; Kasthuriarachchi, SPandemic situation pushed people to explore many different paths to fulfill their basic requirements. Generally pandemic did a considerable progress to enable ecommerce/online capabilities on almost every supplier/producer. People tried the benefit of contactless delivery services and pickup options. As a result, most of the western countries get used to help their grocery shopping and food ordering with curbside pickup. Existing research found some limitations in online delivery methods. This research used actual data collected through survey questionnaires from customers who are using online ordering applications and accordingly descriptive and inferential statistical data has been used to conduct the data analysis. Throughout the research findings, there were strong positive relationships identified in Efficiency, Time, and Convenience factors with curbside pickup. Also, moderate strong positive relationship between Cost and Curbside pickup. This research concludes that the effectiveness of curbside pickup method has positive influence with the variable factors. In future curbside pickup will illuminate the existing issues related to the ongoing online delivery methods.Publication Embargo Investigation of long-term river water quality variations using different urbanization indices and assessment of common scientific perspectives of urbanization on water quality(Wily, 2022-07-10) Pattiyage, I; Gomes, A; Karunatilaka, P. DThis study investigated the water quality variation spanning 30 years (1986–2017) in 16 catchments of Hong Kong against different urbanization indices, namely, built area fraction; population; and product of population and built area fraction. Pearson correlations of three different periods of time (1988–1990, 1998–2000, and 2015–2017) indicated that water quality trends were dependent on the urbanization index. Total solids, nitrite-nitrogen, total phosphorus, electrical conductivity, dissolved oxygen, and flow rate had significant deteriorative trends (Pearson r > 0.5 and p < 0.05) with population and product of built area and population. Results also interpreted that built area fraction and product of built area and population were the worst and best indices that represented urbanization and/or its impacts, respectively. Mann-Kendall test for the entire 30 year period showed that water quality had improved with time with respect to certain water quality parameters (e.g., dissolved oxygen, ammoniacal nitrogen and total suspended solids). The results portrayed that although the urbanization of catchments had increased with time, the river water quality with respect to many parameters showed signs of improvement and the legislative measures implemented seemed to be effective in controlling pollution.