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...
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=...
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 ...
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:...
基于水环境信息规范变换的水质普适指数公式 Universal index formulae of water quality based on normalized transformation of water environment information 文档格式: .pdf 文档大小: 644.14K 文档页数: 10页 顶/踩数: 0/0 收藏人数: 0 评论次数:
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...
Brown also reviewed the model parameters taking into account the expert opinions and their recommended weight values and proposed a weighted average index formula for stream water as follows:(10)BrownWQI=∑i=1nwisiwhere the weight values summed to 1. Brown concluded that this index function worked...
The water quality index (WQI) has been used to identify threats to water quality and to support better water resource management. This study combines a machine learning algorithm, WQI, and remote sensing spectral indices (difference index, DI; ratio inde