This study was performed to simulate the eutropication phenomena of the man-made reservoir, Sangsa lake located at the south east part of Koera. The simulation model was selected as WASP5, a two dimensional water quality simulation model. Total lake water body was divided into 8 surface water, 7 sub...
This study was performed to simulate the eutropication phenomena of the man-made reservoir, Sangsa lake located at the south east part of Koera. The simulation model was selected as WASP5, a two dimensional water quality simulation model. Total lake water body was divided into 8 surface water, 7 sub-surface water, and 6 surface benthic segments. Nutrient release from sediments of benethic layer segments regard as a negligible quantity. Water quantity data refered to the reservoir operation results and the quality data measured at Isacheon, Sangsa 1 and Sangsa 3 sites. The water quality data of Sangsa 1 were used to calibrate and verify of the model. Simulated water quality items were DO, BOD, Chl-a, Org-N, Org-p, NH_(3)-N, NO_(3)-N and PO_(4)-P. Model calibration was performed with field data in 2002, and the verification was done with 2003 data. Sensitivity analysises were performed for 13 reaction constants. And the results of the sensitivity analysis are filed with sensitivity coefficients. Chl-a was investigated to sensible on endogenous respiration rate of phytoplankton, saturated growth rate of phytoplankton, and non-predatory phytoplankton death rate. Inorganic N, such as NH_(4)-N and NO_(3)-N, was Proved to sensible on nitrification rate and denitrification rate. Org-N was sensible on mineralization rate of dissolved organic nitrogen, and denitrification rate. T-P was affected by endogenous respiration rate, phytoplankton growth rate, carbon-to-chl-a ratio, and phytoplankton death rate. CBOD was sensitive to most of constants especially deoxygenation rate, endogenous respiration rate, and phytoplankton growth rate. DO was influenced by temperature, carbon-to-chl-a ratio, reaeration rate, and phytoplankton growth rate. These results are referred to select the adequate reaction constants of the model. Using the results of sensitivity analysis and water quantity and quality data measured in 2002, the reaction constants of WASP5 were calibrated. Calibrated results showed relatively good consistency with measured water quality in the total variation trend, except NH_(4)-N. The range of relativity coefficient for each water quality item was 0.0354(NH_(a)-N)~0.9928(Chl-a). And the range of Normalized Root Mean Square Error was 0.1184(Org-P)-2.1130 (NH_(4)-N). Verification results with 2003 year data were not coincided exactly and the estimated water qualities showed relatively poor consistency with measured ones in the total variation trend. The range of Normalized Root Mean Square Error was 0.2708-2.2277.
This study was performed to simulate the eutropication phenomena of the man-made reservoir, Sangsa lake located at the south east part of Koera. The simulation model was selected as WASP5, a two dimensional water quality simulation model. Total lake water body was divided into 8 surface water, 7 sub-surface water, and 6 surface benthic segments. Nutrient release from sediments of benethic layer segments regard as a negligible quantity. Water quantity data refered to the reservoir operation results and the quality data measured at Isacheon, Sangsa 1 and Sangsa 3 sites. The water quality data of Sangsa 1 were used to calibrate and verify of the model. Simulated water quality items were DO, BOD, Chl-a, Org-N, Org-p, NH_(3)-N, NO_(3)-N and PO_(4)-P. Model calibration was performed with field data in 2002, and the verification was done with 2003 data. Sensitivity analysises were performed for 13 reaction constants. And the results of the sensitivity analysis are filed with sensitivity coefficients. Chl-a was investigated to sensible on endogenous respiration rate of phytoplankton, saturated growth rate of phytoplankton, and non-predatory phytoplankton death rate. Inorganic N, such as NH_(4)-N and NO_(3)-N, was Proved to sensible on nitrification rate and denitrification rate. Org-N was sensible on mineralization rate of dissolved organic nitrogen, and denitrification rate. T-P was affected by endogenous respiration rate, phytoplankton growth rate, carbon-to-chl-a ratio, and phytoplankton death rate. CBOD was sensitive to most of constants especially deoxygenation rate, endogenous respiration rate, and phytoplankton growth rate. DO was influenced by temperature, carbon-to-chl-a ratio, reaeration rate, and phytoplankton growth rate. These results are referred to select the adequate reaction constants of the model. Using the results of sensitivity analysis and water quantity and quality data measured in 2002, the reaction constants of WASP5 were calibrated. Calibrated results showed relatively good consistency with measured water quality in the total variation trend, except NH_(4)-N. The range of relativity coefficient for each water quality item was 0.0354(NH_(a)-N)~0.9928(Chl-a). And the range of Normalized Root Mean Square Error was 0.1184(Org-P)-2.1130 (NH_(4)-N). Verification results with 2003 year data were not coincided exactly and the estimated water qualities showed relatively poor consistency with measured ones in the total variation trend. The range of Normalized Root Mean Square Error was 0.2708-2.2277.
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