Effect of VG Model Parameter Changes on Soil Infiltration Under Varying-head Infiltration
In order to explore the influence of various parameters of Van Genuchten model on infiltration characteristics of soils of different textures in the condition of varying-head infiltration,based on the HYDRUS-1D model,this paper analyzes the sensitivity of VG model parameters under different soil tex...
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Editorial Office of Pearl River
2021-01-01
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| Series: | Renmin Zhujiang |
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| Online Access: | http://www.renminzhujiang.cn/thesisDetails#10.3969/j.issn.1001-9235.2021.09.011 |
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| author | LI Xinli CHEN Li |
| author_facet | LI Xinli CHEN Li |
| author_sort | LI Xinli |
| collection | DOAJ |
| description | In order to explore the influence of various parameters of Van Genuchten model on infiltration characteristics of soils of different textures in the condition of varying-head infiltration,based on the HYDRUS-1D model,this paper analyzes the sensitivity of VG model parameters under different soil texture and output variables by the partial analysis method.The results show that:The influence of each parameter on the pressure head decreases as the soil texture becomes finer,and the parameter sensitivity of soils with same texture reaches the maximum at the end of the rainfall,and then decreases with the increase of time;The effects of positive and negative perturbation of the same parameter on cumulative infiltration are basically the same;n、K<sub>s</sub>、θ<sub>s</sub> have greater influence on pressure head and cumulative infiltration;The influence of VG model parameters on the wetting front transport distance for soil of different textures varies greatly,and the sensitivity of each parameter is ranked as follows:θ<sub>s</sub>＞K<sub>s</sub>＞α＞n＞θ<sub>r</sub>(sandy loam),α＞θ<sub>s</sub>＞K<sub>s</sub>＞θ<sub>r</sub>＞n(loam),n＞α＞θ<sub>r</sub>＞θ<sub>s</sub>＞K<sub>s</sub>(clay loam).Boundary conditions are one of the important factors affecting parameter sensitivity of VG model.Therefore,when applying the model,more attention should be paid to the choice of boundary conditions and the accuracy of the parameters θ<sub>s</sub>、α、n、K<sub>s</sub>. |
| format | Article |
| id | doaj-art-2e318ce5ac7341198cd4565a69851074 |
| institution | Kabale University |
| issn | 1001-9235 |
| language | zho |
| publishDate | 2021-01-01 |
| publisher | Editorial Office of Pearl River |
| record_format | Article |
| series | Renmin Zhujiang |
| spelling | doaj-art-2e318ce5ac7341198cd4565a698510742025-01-15T02:28:14ZzhoEditorial Office of Pearl RiverRenmin Zhujiang1001-92352021-01-014247646466Effect of VG Model Parameter Changes on Soil Infiltration Under Varying-head InfiltrationLI XinliCHEN LiIn order to explore the influence of various parameters of Van Genuchten model on infiltration characteristics of soils of different textures in the condition of varying-head infiltration,based on the HYDRUS-1D model,this paper analyzes the sensitivity of VG model parameters under different soil texture and output variables by the partial analysis method.The results show that:The influence of each parameter on the pressure head decreases as the soil texture becomes finer,and the parameter sensitivity of soils with same texture reaches the maximum at the end of the rainfall,and then decreases with the increase of time;The effects of positive and negative perturbation of the same parameter on cumulative infiltration are basically the same;n、K<sub>s</sub>、θ<sub>s</sub> have greater influence on pressure head and cumulative infiltration;The influence of VG model parameters on the wetting front transport distance for soil of different textures varies greatly,and the sensitivity of each parameter is ranked as follows:θ<sub>s</sub>＞K<sub>s</sub>＞α＞n＞θ<sub>r</sub>(sandy loam),α＞θ<sub>s</sub>＞K<sub>s</sub>＞θ<sub>r</sub>＞n(loam),n＞α＞θ<sub>r</sub>＞θ<sub>s</sub>＞K<sub>s</sub>(clay loam).Boundary conditions are one of the important factors affecting parameter sensitivity of VG model.Therefore,when applying the model,more attention should be paid to the choice of boundary conditions and the accuracy of the parameters θ<sub>s</sub>、α、n、K<sub>s</sub>.http://www.renminzhujiang.cn/thesisDetails#10.3969/j.issn.1001-9235.2021.09.011sensitivity analysisvan Genuchten modelvarying-head infiltrationnumerical simulation |
| spellingShingle | LI Xinli CHEN Li Effect of VG Model Parameter Changes on Soil Infiltration Under Varying-head Infiltration Renmin Zhujiang sensitivity analysis van Genuchten model varying-head infiltration numerical simulation |
| title | Effect of VG Model Parameter Changes on Soil Infiltration Under Varying-head Infiltration |
| title_full | Effect of VG Model Parameter Changes on Soil Infiltration Under Varying-head Infiltration |
| title_fullStr | Effect of VG Model Parameter Changes on Soil Infiltration Under Varying-head Infiltration |
| title_full_unstemmed | Effect of VG Model Parameter Changes on Soil Infiltration Under Varying-head Infiltration |
| title_short | Effect of VG Model Parameter Changes on Soil Infiltration Under Varying-head Infiltration |
| title_sort | effect of vg model parameter changes on soil infiltration under varying head infiltration |
| topic | sensitivity analysis van Genuchten model varying-head infiltration numerical simulation |
| url | http://www.renminzhujiang.cn/thesisDetails#10.3969/j.issn.1001-9235.2021.09.011 |
| work_keys_str_mv | AT lixinli effectofvgmodelparameterchangesonsoilinfiltrationundervaryingheadinfiltration AT chenli effectofvgmodelparameterchangesonsoilinfiltrationundervaryingheadinfiltration |