A Study on Verification of Delivery Ratio Methodology for Basic Plan at TPLMs(Total Pollutant Load Management System)

Abstract

The TPLMs is a system to manage the total amount of pollutants discharged from the watershed in order to achieve the target water quality of the river. In this process, the pollutant load can be classified into generation, discharge and delivery load. When using equation 2, the discharge coefficient should be 1. In case of using equation 3, it is considered that the discharge coefficient defined in the Technical Guideline should be applied. The delivery load is calculated as the product of the discharge load and the delivery ratio, and the delivery ratio is defined as the rate at which the pollutant discharged from the watershed reaches a specific point in the stream. In this study, the delivery ratio estimation method proposed by Hwang (2016) was applied to the Yonggang watershed in the Nakdong river. And the input data of QUALKO2 model was generated by using the estimated delivery ratio (equation 3) and the validation study was conducted by comparing with DRave (equation 2). As a result of the study, it is possible to use both the equation 2 and the equation 3, but it is necessary to change the methodology according to the application of the discharge coefficient.

Log-Linear Model and Delivery Load Analysis for Improvements in Water Quality through TMDL in the Gyeongan Stream Watershed, Republic of Korea

“…According to prior research by Choi et al [40], if the coefficient of determination (R 2 ) is 0.5 to 0.6 or higher, it effectively reflects the trend value of the delivery ratio regression analysis. The applicability derived in this study (BOD 0.50, T-N 0.60, T-P 0.91) is judged to be high, as verified in studies by Park [12], Hwang et al [26], Lee et al [29], and Kim et al [41]. According to prior research by Choi et al [40], if the coefficient of determination (R 2 ) is 0.5 to 0.6 or higher, it effectively reflects the trend value of the delivery ratio regression analysis.…”

“…According to prior research by Choi et al [40], if the coefficient of determination (R 2 ) is 0.5 to 0.6 or higher, it effectively reflects the trend value of the delivery ratio regression analysis. The applicability derived in this study (BOD 0.50, T-N 0.60, T-P 0.91) is judged to be high, as verified in studies by Park [12], Hwang et al [26], Lee et al [29], and Kim et al [41].…”

“…The SLM establishes a linear (log) relationship between Q and water quality (load) [12,[27][28][29][30], which can be expressed in terms of concentration, as shown in the following equation (Equation ( 2)),…”

Analysis of Water Quality Characteristics in Unit Watersheds in the Hangang Basin with Respect to TMDL Implementation

“…In Korea, the TMDL strategy has been extensively implemented; however, its implementation is still pending in some areas. Additionally, given that biochemical oxygen demand (BOD) and total phosphorus (TP) are used as water quality indicators in TMDL implementation [6] and because these same indicators are monitored nationwide, it is necessary to investigate whether the effective application of TMDL results in actual improvements in overall water quality.…”