The response of hydraulic conductivity to air-trapped saturation in a dissolution process of trapped-air in quasi-saturated fine sands media
The hydraulic conductivity of a quasi-saturated aquifer decreases with the increase of air-trapped saturation, but it is difficult to obtain a continuous data on air-trapped saturation through the traditional displacement experiments due to limitations in experimental operations and measurement accu...
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| Format: | Article |
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Editorial Office of Hydrogeology & Engineering Geology
2024-11-01
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| Series: | Shuiwen dizhi gongcheng dizhi |
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| Online Access: | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202401015 |
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| author | Donghui CHENG Yingbo LAN Jing YUAN Lin XIANG Xiaoting YANG Xiaoying QIAO Lin DENG Zilin WANG Qing WANG |
| author_facet | Donghui CHENG Yingbo LAN Jing YUAN Lin XIANG Xiaoting YANG Xiaoying QIAO Lin DENG Zilin WANG Qing WANG |
| author_sort | Donghui CHENG |
| collection | DOAJ |
| description | The hydraulic conductivity of a quasi-saturated aquifer decreases with the increase of air-trapped saturation, but it is difficult to obtain a continuous data on air-trapped saturation through the traditional displacement experiments due to limitations in experimental operations and measurement accuracy. It limits the accurate characterization of the relationship between small air-trapped saturation and the corresponding quasi-saturated hydraulic conductivity. This study designed an oxygen-trapped dissolution experiment in quasi-saturated fine sands media, instead of air-trapped, in which the soluble oxygen in water and the corresponding hydraulic conductivity can be accurately measured. Then a large amount of continuous data on air-trapped saturation and its quasi-saturated hydraulic conductivity were obtained. The experimental results show that when the air-trapped saturation is less than 5%, trapped gas may enter the ineffective pores and thus has a little effect on the value of the hydraulic conductivity. However, when the trapped gas saturation is between 5%－6%, it forms a pore throat block effect, which intensifies the influence on the hydraulic conductivity. Furthermore, a new model, i.e., van Genuchten model, was constructed to predict the quasi-saturated hydraulic conductivity. This model overcomes the shortcomings of the traditional power-law model and well characterized the feature that the small air-trapped saturation has little effect on the hydraulic conductivity. At high air-trapped saturation, the performance of van Genuchten model is comparable to the traditional model. The proposed model in this study can provide foundation for studying quasi-saturated water flow and solute transport. |
| format | Article |
| id | doaj-art-56bbe41de9d64f3d9242e9afc3ab75bc |
| institution | Kabale University |
| issn | 1000-3665 |
| language | zho |
| publishDate | 2024-11-01 |
| publisher | Editorial Office of Hydrogeology & Engineering Geology |
| record_format | Article |
| series | Shuiwen dizhi gongcheng dizhi |
| spelling | doaj-art-56bbe41de9d64f3d9242e9afc3ab75bc2025-01-18T03:53:12ZzhoEditorial Office of Hydrogeology & Engineering GeologyShuiwen dizhi gongcheng dizhi1000-36652024-11-015161710.16030/j.cnki.issn.1000-3665.202401015202401015The response of hydraulic conductivity to air-trapped saturation in a dissolution process of trapped-air in quasi-saturated fine sands mediaDonghui CHENG0Yingbo LAN1Jing YUAN2Lin XIANG3Xiaoting YANG4Xiaoying QIAO5Lin DENG6Zilin WANG7Qing WANG8School of Water and Environment, Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Water and Environment, Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Water and Environment, Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Water and Environment, Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Water and Environment, Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Water and Environment, Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Water and Environment, Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Water and Environment, Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Water and Environment, Chang’an University, Xi’an, Shaanxi 710054, ChinaThe hydraulic conductivity of a quasi-saturated aquifer decreases with the increase of air-trapped saturation, but it is difficult to obtain a continuous data on air-trapped saturation through the traditional displacement experiments due to limitations in experimental operations and measurement accuracy. It limits the accurate characterization of the relationship between small air-trapped saturation and the corresponding quasi-saturated hydraulic conductivity. This study designed an oxygen-trapped dissolution experiment in quasi-saturated fine sands media, instead of air-trapped, in which the soluble oxygen in water and the corresponding hydraulic conductivity can be accurately measured. Then a large amount of continuous data on air-trapped saturation and its quasi-saturated hydraulic conductivity were obtained. The experimental results show that when the air-trapped saturation is less than 5%, trapped gas may enter the ineffective pores and thus has a little effect on the value of the hydraulic conductivity. However, when the trapped gas saturation is between 5%－6%, it forms a pore throat block effect, which intensifies the influence on the hydraulic conductivity. Furthermore, a new model, i.e., van Genuchten model, was constructed to predict the quasi-saturated hydraulic conductivity. This model overcomes the shortcomings of the traditional power-law model and well characterized the feature that the small air-trapped saturation has little effect on the hydraulic conductivity. At high air-trapped saturation, the performance of van Genuchten model is comparable to the traditional model. The proposed model in this study can provide foundation for studying quasi-saturated water flow and solute transport.https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202401015quasi-saturated fine sands mediaair-trapped saturationhydraulic conductivityvan genuchten modelfaybishenko model |
| spellingShingle | Donghui CHENG Yingbo LAN Jing YUAN Lin XIANG Xiaoting YANG Xiaoying QIAO Lin DENG Zilin WANG Qing WANG The response of hydraulic conductivity to air-trapped saturation in a dissolution process of trapped-air in quasi-saturated fine sands media Shuiwen dizhi gongcheng dizhi quasi-saturated fine sands media air-trapped saturation hydraulic conductivity van genuchten model faybishenko model |
| title | The response of hydraulic conductivity to air-trapped saturation in a dissolution process of trapped-air in quasi-saturated fine sands media |
| title_full | The response of hydraulic conductivity to air-trapped saturation in a dissolution process of trapped-air in quasi-saturated fine sands media |
| title_fullStr | The response of hydraulic conductivity to air-trapped saturation in a dissolution process of trapped-air in quasi-saturated fine sands media |
| title_full_unstemmed | The response of hydraulic conductivity to air-trapped saturation in a dissolution process of trapped-air in quasi-saturated fine sands media |
| title_short | The response of hydraulic conductivity to air-trapped saturation in a dissolution process of trapped-air in quasi-saturated fine sands media |
| title_sort | response of hydraulic conductivity to air trapped saturation in a dissolution process of trapped air in quasi saturated fine sands media |
| topic | quasi-saturated fine sands media air-trapped saturation hydraulic conductivity van genuchten model faybishenko model |
| url | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202401015 |
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