Passive to active tie-in for soil gas surveys: Improved technique for source-area, spatial variability, remediation-monitoring, and vapor-intrusion assessment

2009 ◽  
Vol 19 (2) ◽  
pp. 71-83 ◽  
Author(s):  
Joseph E. Odencrantz ◽  
Harry O'Neill
Keyword(s):  
Spatial Variability ◽  
Source Area ◽  
Soil Gas ◽  
Vapor Intrusion ◽  
Improved Technique

scholarly journals A Petroleum Vapor Intrusion Model Involving Upward Advective Soil Gas Flow Due to Methane Generation

2015 ◽  
Vol 49 (19) ◽  
pp. 11577-11585 ◽  
Author(s):  
Yijun Yao ◽  
Yun Wu ◽  
Yue Wang ◽  
Iason Verginelli ◽  
Tian Zeng ◽  
...  
Keyword(s):  
Gas Flow ◽  
Soil Gas ◽  
Vapor Intrusion ◽  
Methane Generation

scholarly journals Influence of Soil Moisture on Soil Gas Vapor Concentration for Vapor Intrusion

2013 ◽  
Vol 30 (10) ◽  
pp. 628-637 ◽  
Author(s):  
Rui Shen ◽  
Kelly G. Pennell ◽  
Eric M. Suuberg
Keyword(s):  
Soil Moisture ◽  
Soil Gas ◽  
Vapor Concentration ◽  
Vapor Intrusion

Spatial variability of soil organic carbon in a typical watershed in the source area of the middle Dan River, China

Soil Research ◽  
2013 ◽  
Vol 51 (1) ◽  
pp. 41 ◽  
Author(s):  
Guo-Ce Xu ◽  
Zhan-Bin Li ◽  
Peng Li ◽  
Ke-Xin Lu ◽  
Yun Wang
Keyword(s):  
Land Use ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Spatial Variability ◽  
Spatial Heterogeneity ◽  
Spatial Variation ◽  
Soil Depth ◽  
Source Area ◽  
Soil Layers ◽  
Land Use Types

Soil organic carbon (SOC) plays an important role in maintaining and improving soil fertility and quality, in addition to mitigating climate change. Understanding SOC spatial variability is fundamental for describing soil resources and predicting SOC. In this study, SOC content and SOC mass were estimated based on a soil survey of a small watershed in the Dan River, China. The spatial heterogeneity of SOC distribution and the impacts of land-use types, elevation, slope, and aspect on SOC were also assessed. Field sampling was carried out based on a 100 m by 100 m grid system overlaid on the topographic map of the study area, and samples were collected in three soil layers to a depth of 40 cm. In total, 222 sites were sampled and 629 soil samples were collected. The results showed that classical kriging could successfully interpolate SOC content in the watershed. Contents of SOC showed strong spatial heterogeneity based on the values of the coefficient of variation and the nugget ratio, and this was attributed largely to the type of land use. The range of the semi-variograms increased with increasing soil depth. The SOC content in the soil profile decreased as soil depth increased, and there were significant (P < 0.01) differences among the three soil layers. Land use had a great impact on the SOC content. ANOVA indicated that the spatial variation of SOC contents under different land use types was significant (P < 0.05). The SOC mass of different land-use types followed the order grassland > forestland > cropland. Mean SOC masses of grassland, forestland, and cropland at a depth of 0–40 cm were 5.87, 5.61, and 5.07 kg m–2, respectively. The spatial variation of SOC masses under different land-use types was significant (P < 0.05). ANOVA also showed significant (P < 0.05) impact of aspect on SOC mass in soil at 0–40 cm. Soil bulk density played an important role in the assessment of SOC mass. In conclusion, carbon in soils in the source area of the middle Dan River would increase with conversion from agricultural land to forest or grassland.

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