| Title: |
The response of hydraulic conductivity to air-trapped saturation in a dissolution process of trapped-air in quasi-saturated fine sands media |
| Authors: |
Donghui CHENG, Yingbo LAN, Jing YUAN, Lin XIANG, Xiaoting YANG, Xiaoying QIAO, Lin DENG, Zilin WANG, Qing WANG |
| Source: |
Shuiwen dizhi gongcheng dizhi, Vol 51, Iss 6, Pp 1-7 (2024) |
| Publisher Information: |
Editorial Office of Hydrogeology & Engineering Geology, 2024. |
| Publication Year: |
2024 |
| Collection: |
LCC:Geology |
| Subject Terms: |
quasi-saturated fine sands media, air-trapped saturation, hydraulic conductivity, van genuchten model, faybishenko model, Geology, QE1-996.5 |
| More Details: |
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. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
Chinese |
| ISSN: |
1000-3665 |
| Relation: |
https://doaj.org/toc/1000-3665 |
| DOI: |
10.16030/j.cnki.issn.1000-3665.202401015 |
| Access URL: |
https://doaj.org/article/56bbe41de9d64f3d9242e9afc3ab75bc |
| Accession Number: |
edsdoj.56bbe41de9d64f3d9242e9afc3ab75bc |
| Database: |
Directory of Open Access Journals |
