An, Seongnam Saputra, Livinia Woo, Heesoo Lee, Kyung-Jin Jo, Ho Young Kim, Sang Hyun Chung, Jaeshik Lee, Seunghak 2024-08-16T04:30:21Z 2024-08-16T04:30:21Z 2024-08-16 2024-09 0304-3894 https://pubs.kist.re.kr/handle/201004/150448 Evaluating and predicting the natural attenuation capacity (AC) of a vadose zone is essential for determining groundwater vulnerability to contamination from upper sources. However, it remains unclear how the physicochemical properties of vadose zone soils affect AC owing to their complexity and spatial heterogeneity. In this study, we developed a regression model for estimating the AC of a vadose zone against diesel using datasets from different soils with a wide range of physicochemical properties. Among the 17 properties, six (i.e., organic matter (OM), total phosphorous (TP), coefficient of uniformity, particle size (D30), van Genuchten's n, saturation degree (SD)) were selected as primary regressors. The results indicate that biogeochemical factors, including OM and TP, have decisive effects on the AC. Finally, the regression model was expanded to a GIS-based spatial model and applied to Namyangju, Korea using the index-overlay method. The produced AC map showed a nonmonotonic decrease along the depth, and the areas closer to the water bodies generally represented low AC values, most English Elsevier BV Empirical relationship between vadose zone properties and diesel attenuation capacity: A complement for intrinsic vulnerability models Article 10.1016/j.jhazmat.2024.135314 1 Journal of Hazardous Materials, v.477 Journal of Hazardous Materials 477 Y scie scopus 001283972800001 2-s2.0-85199679399 Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology Article GROUNDWATER VULNERABILITY DRASTIC MODEL NATURAL ATTENUATION ORGANIC-MATTER SOIL PROFILES PHOSPHORUS NITRATE BIODEGRADATION BIOSTIMULATION BIOREMEDIATION Attenuation capacity Groundwater vulnerability Petroleum hydrocarbons Vadose zone