Abstract
How retardation of river flow, resulted from weir construction, affected on algal growth were investigated. 14 sampling points along with The Nakdong River, South Korea, were chosen. Monthly samples were taken from March 2012 to October 2012 to check changes of numbers and types of algae. The dominant algae changed from diatom during spring to blue-green algae during summer. Diatom became a dominant one again for several sampling points by the time which air temperature started to go down, September and then they were replaced as dominant species for most sampling points at October. As results, changes of dominant algae showed seasonal effects and the most important factor for algal growth at this region is the changing pattern of temperature.
Highlights
Water blooms were occurred in two sampling points out of 14 sampling sites on July 3th
Possibilities of water bloom in other sampling points are high because of high temperature during July, but it could not be checked since the study performed a monthly sampling
Temperature at the study area became to rise from June 2012 and dominant algae changed for several sampling point, diatom to blue-green algae and from July 2012, most of sampling points were dominated by blue-green algae such as Microcystis spp., Anabaena sp. and Oscillatoria spp. which species are toxic to human being or wild animals
Summary
Constructing dam or weir is the common way to reserve the water to make up water shortage problems. Korean government completed nationwide scale construction project, so called ‘the four major river project’, at the end of 2012 to solve such problems. The main purpose of the project were obtaining water resources and managing water quality throughout building 16 weirs along with four major rivers in Korea. Even after the project had been completed, strong opinions, which concerns degradation of water quality because those 16 weirs would detain water, kept representing. One worries rapid algal growth, so called water bloom, because of eutrophication due to detained water at weirs
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