Author(s)

ShiWei Yu, Li You

Corresponding Author

Li You

ABSTRACT

Water resources and water environment problems are serious in countries along the belt and Road, especially in Sri Lanka. Through collecting and analyzing water samples from 15 different areas and 3 different times of Kandy Lake, and evaluating water samples under spatial and temporal differences by Demerol index method, the improvement measures of Kandy Lake water quality can be put forward. The results show that there are significant spatial differences in the pollution indexes of Kandy Lake. The Nemero comprehensive pollution index of At Devon Hotel reaches 5.21, which is a serious pollution level, far higher than that of the Lake Center. At the same time, the pollution index of Kandy Lake was greatly affected by the difference of time and season. The Nemero comprehensive pollution index of Kandy Lake was 5.26 during the 12.03.2018 Rainy Weather, which is well ahead of 18.01.2018 Dry Weather and 20.06.2018 Partly Weather's 1.21 and 1.98. Therefore, according to the law of crowd activities, surface flow constructed wetlands are recommended to establish along the Bank of Kandy Lake with less crowd, while subsurface flow wetlands are recommended to establish along the coast of restaurant and Hotels with more crowd activities. Surface flow wetlands dominated by typical moist plant pools with emergent floating submerged vegetation are recommended to establish at the inlet, in order to improve the overall water quality of Kandy Lake. The research results can provide reference for water pollution control in Sri Lanka.

KEYWORDS

“Belt and Road”, Sri Lanka, Kandy Lake, Water quality assessment