Numerical modelling study on non-steady-state groundwater flow systems in response to changing rainfall
Objective Geological, climatic, and topographical conditions control regional groundwater flow systems. Previous researchers have made significant advancements in developing the theory of groundwater flow systems under steady-state climatic conditions. However, there has been limited progress in com...
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| Format: | Article |
| Language: | zho |
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Editorial Department of Bulletin of Geological Science and Technology
2023-07-01
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| Series: | 地质科技通报 |
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| Online Access: | https://dzkjqb.cug.edu.cn/en/article/doi/10.19509/j.cnki.dzkq.tb20230030 |
| _version_ | 1797277580015960064 |
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| author | Xiaolang Zhang Jiu Jiao Jimmy |
| author_facet | Xiaolang Zhang Jiu Jiao Jimmy |
| author_sort | Xiaolang Zhang |
| collection | DOAJ |
| description | Objective Geological, climatic, and topographical conditions control regional groundwater flow systems. Previous researchers have made significant advancements in developing the theory of groundwater flow systems under steady-state climatic conditions. However, there has been limited progress in comprehensively understanding transient groundwater flow systems. Methods To address this gap, we constructed a two-dimensional numerical model that couples groundwater and surface water using HydroGeoSphere. We then examined the relationships among the subsystems of transient groundwater flow systems in response to variations in rainfall. Results The results demonstrate that the areas occupied by subsystems change with rainfall fluctuations. Local groundwater flow systems may neither expand during wet seasons nor contract during dry seasons. The relationships among the penetration depths, which indicate the elevation of the lowest point in a local flow system, can be positive, negative, or unrelated. This variation mainly arises from the high activity of intermediate groundwater flow systems under transient conditions, where their inputs, outputs, flow paths, and areas of recharge and discharge vary with rainfall fluctuations. These relationships are also sensitive to factors such as geology (hydraulic conductivity, specific storage), climate (rainfall rate), and topography (local and regional). Conclusion Based on a sensitivity analysis of five scenarios, changes in local flow systems are more influenced by aquifer anisotropy. Future research should prioritize conducting a more comprehensive analysis of the non-steady-state response patterns exhibited by groundwater flow systems, considering climate fluctuations on a seasonal scale, over multiple years, and even across centuries. |
| first_indexed | 2024-03-07T15:50:28Z |
| format | Article |
| id | doaj.art-86ad4b5b35df427ba3e5a27b03611cf3 |
| institution | Directory Open Access Journal |
| issn | 2096-8523 |
| language | zho |
| last_indexed | 2024-03-07T15:50:28Z |
| publishDate | 2023-07-01 |
| publisher | Editorial Department of Bulletin of Geological Science and Technology |
| record_format | Article |
| series | 地质科技通报 |
| spelling | doaj.art-86ad4b5b35df427ba3e5a27b03611cf32024-03-05T02:39:25ZzhoEditorial Department of Bulletin of Geological Science and Technology地质科技通报2096-85232023-07-0142415416110.19509/j.cnki.dzkq.tb20230030dzkjtb-42-4-154Numerical modelling study on non-steady-state groundwater flow systems in response to changing rainfallXiaolang Zhang0Jiu Jiao Jimmy1School of Earth Sciences, The Ohio State University, Columbus, Ohio 43210, USADepartment of Earth Sciences, The University of Hong Kong, Hong Kong 999077, ChinaObjective Geological, climatic, and topographical conditions control regional groundwater flow systems. Previous researchers have made significant advancements in developing the theory of groundwater flow systems under steady-state climatic conditions. However, there has been limited progress in comprehensively understanding transient groundwater flow systems. Methods To address this gap, we constructed a two-dimensional numerical model that couples groundwater and surface water using HydroGeoSphere. We then examined the relationships among the subsystems of transient groundwater flow systems in response to variations in rainfall. Results The results demonstrate that the areas occupied by subsystems change with rainfall fluctuations. Local groundwater flow systems may neither expand during wet seasons nor contract during dry seasons. The relationships among the penetration depths, which indicate the elevation of the lowest point in a local flow system, can be positive, negative, or unrelated. This variation mainly arises from the high activity of intermediate groundwater flow systems under transient conditions, where their inputs, outputs, flow paths, and areas of recharge and discharge vary with rainfall fluctuations. These relationships are also sensitive to factors such as geology (hydraulic conductivity, specific storage), climate (rainfall rate), and topography (local and regional). Conclusion Based on a sensitivity analysis of five scenarios, changes in local flow systems are more influenced by aquifer anisotropy. Future research should prioritize conducting a more comprehensive analysis of the non-steady-state response patterns exhibited by groundwater flow systems, considering climate fluctuations on a seasonal scale, over multiple years, and even across centuries.https://dzkjqb.cug.edu.cn/en/article/doi/10.19509/j.cnki.dzkq.tb20230030groundwater flow systemlocal flow systempenetration depthrainfall fluctuation |
| spellingShingle | Xiaolang Zhang Jiu Jiao Jimmy Numerical modelling study on non-steady-state groundwater flow systems in response to changing rainfall 地质科技通报 groundwater flow system local flow system penetration depth rainfall fluctuation |
| title | Numerical modelling study on non-steady-state groundwater flow systems in response to changing rainfall |
| title_full | Numerical modelling study on non-steady-state groundwater flow systems in response to changing rainfall |
| title_fullStr | Numerical modelling study on non-steady-state groundwater flow systems in response to changing rainfall |
| title_full_unstemmed | Numerical modelling study on non-steady-state groundwater flow systems in response to changing rainfall |
| title_short | Numerical modelling study on non-steady-state groundwater flow systems in response to changing rainfall |
| title_sort | numerical modelling study on non steady state groundwater flow systems in response to changing rainfall |
| topic | groundwater flow system local flow system penetration depth rainfall fluctuation |
| url | https://dzkjqb.cug.edu.cn/en/article/doi/10.19509/j.cnki.dzkq.tb20230030 |
| work_keys_str_mv | AT xiaolangzhang numericalmodellingstudyonnonsteadystategroundwaterflowsystemsinresponsetochangingrainfall AT jiujiaojimmy numericalmodellingstudyonnonsteadystategroundwaterflowsystemsinresponsetochangingrainfall |