Full
Outline
To address the shortcoming of lacking optimization and adjustment methods for long-term monitoring indicators of the groundwater risk control project at contaminated sites, a typical large-scale contaminated site impacted by hazardous waste landfill was focused in the present study. By collecting the existing groundwater monitoring data during the construction, effect evaluation and long-term monitoring periods, a feature dataset regarding exceedances of monitoring wells was constructed for decision-making optimization exploration. Further, the three decision tree models, including Chi-squared Automatic Interaction Detector (CHAID), Exhaustive CHAID(E-CHAID), and Classification and Regression Trees (CART), were employed to identify key monitoring indicators influencing groundwater monitoring well exceedances. The results indicated that it was feasible to use decision tree models to predict groundwater monitoring well exceedances. Based on the all evaluated metrics, including accuracy, precision, recall, and the F1-score (harmonic mean of precision and recall), the CART model significantly outperformed both the CHAID and E-CHAID models, suggesting that the overall optimization algorithm of the CART model was much suitable for predicting groundwater pollution exceedance events. 1,2,4-Trichlorobenzene and Nickel were identified as the most significant impact factors on the CART model's predictions. Moreover, the Fluoride, Petroleum Hydrocarbons, Trichloromethane, Dichloromethane, Cadmium, and cis-1,2-Dichloroethylene also demonstrated obvious influences. Consequently, it was recommended that the particular attention should be paid to the pollution dynamics of these 8key monitoring indicators during subsequent long-term monitoring of site groundwater.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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