TITLE:
Trend Analysis of Water Pollutant at Summer Rainfall Season
AUTHORS:
Youngshin Lee, Sanghee Shin
KEYWORDS:
Rainfall Event; Reservoir Control; Water Pollution; Nutrients; Non-Point Pollution Source
JOURNAL NAME:
Journal of Environmental Protection,
Vol.5 No.4,
March
18,
2014
ABSTRACT: This
study, with Hongdong Reservoir, is intended to evaluate the changes in water
quality in the lake before and after rainfall in summer. Various non-point
source pollutions are scattered around the reservoir, and to determine the
pollution level by pollution source, samples were taken at the same point
before rainfall (1st), during rainfall (2nd) and after rainfall (3rd) and
concentration was measured. Pollutant concentration curve at the measuring
points (HDS1, HDS2, HDS3) appeared to be similar with the hydrological curve.
When comparing the concentration immediately before rainfall with event mean
concentration (EMC), SS and COD were 4 - 59 times and 1 - 4 times,
respectively. However, when it comes to total nitrogen (T-N), concentration
arrived at the reservoir stayed the range of 1.3 - 12.0 mg/L in all 3 cases
without significant variation, which indicated that total nitrogen load is
critical when arriving at the reservoir, irrespective of rainfall, and thus it’s
necessary to consider non-point source pollution runoff also in addition to
point source pollution when developing the water quality improvement measures
in reservoir.