a universal index suitable to multi-parameter water quality evaluation was presented, as the monitoring values of parameters in the water quality index formula in logarithm function form were replaced by their relative values, and optimizing the parameters of different indices in the formula was carrie...
The Malaysian Department of Environment developed an WQI in 1997 as illustrated by53 which used six water quality parameters (DO, BOD5, COD, TSS, ammonia, pH). All six parameters are used in this study to determine the value of WQI. The WQI formula used by Malaysia is as follows. $$ ...
In the TWQI Method, the weighting factors ("Wi") were calculated, taking into account the toxic levels of each parameter and the hierarchical tables of water quality depended on the sum of number of parameters surveyed (2≤n≤100) were all calculated by theoretical formulae, and ...
(8.2) shows the general formula for the “water privation potential” or the so-called as “water scarcity footprint.” (8.2)Waterscarcityfootprintproduct,i=Waterconsumptionproduct,i×WSIi where, water consumptionproduct,i represents the amount of freshwater consumed for the production of product ...
Therefore, the normalized eigenvector (weights) is calculated by the geometric mean method using the following formula (9):(9)Wn=GMn∑n=1NfGMnwhere, GMn indicates the geometric mean of the ith row of judgment matrices and Nf the total number of variables/parameters of the ith row and are ...
It can be computed using the following formula: 𝐴𝑐𝑐𝑢𝑟𝑎𝑐𝑦=𝑇𝑃+𝑇𝑁𝑇𝑃+𝑇𝑁+𝐹𝑃+𝐹𝑁Accuracy=TP+TNTP+TN+FP+FN (12) Precision is the exactness of the classifier. Mathematically, precision can be computed as: 𝑃𝑟𝑒𝑐𝑖𝑠𝑖𝑜𝑛=...
Monte Carlo-CWQI for water quality evaluation According to the water quality monitoring data of each section, a series of single-factor pollution index values were calculated by formula (2) and then the natural logarithmic transformation was performed. After the Kolmogorov–Smirnov test, the transform...
The Euclidean distance (D2) is the geometric between two objects and can be calculated by the given formula: D2=(ZEC1−ZEC2)2+(ZHTDS1−ZTDS2)2+(ZPH1−ZPH2)2+(ZCa2+1−ZCa2+2)2+⋯ (9) The dendrogram for cluster analysis of 31 water samples are shown in Fig. 7. It...
) for statistical analysis. Mean values and standard deviations were calculated. One-Way Analysis of Variance (ANOVA) was used to test statistically significant difference in tested parameters among sample sources. The overall efficiency of the treatment plant was calculated using the following formula:...
水环境质量的普适指数公式 ( Universal index formula on water environment quality) 3.1 水 环境 质量 的多种 普适 指数公 式 的表 示式 表1 中 3 类水 体共 72 项指标 的分 级标准值 C ( = 1 ,2 ,⋯ ,72 ; :1,2,3 ,4 ,5 ) 用式 ( 1) ～( 4 ) 变换 为 变换值 Xj...