| 引用本文: | 曹思佳,李云良,李宁宁,陈静,宋炎炎,赵贵章,李志萍.鄱阳湖典型洪泛区地下水数值模拟研究.湖泊科学,2023,35(1):298-312. DOI:10.18307/2023.0123 |
| Cao Sijia,Li Yunliang,Li Ningning,Chen Jing,Song Yanyan,Zhao Guizhang,Li Zhiping.Groundwater numerical simulation in the typical floodplain of Lake Poyang. J. Lake Sci.2023,35(1):298-312. DOI:10.18307/2023.0123 |
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| 鄱阳湖典型洪泛区地下水数值模拟研究 |
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曹思佳1, 李云良2,3, 李宁宁4, 陈静3,5, 宋炎炎2, 赵贵章1, 李志萍1
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1.华北水利水电大学地球科学与工程学院, 郑州 450045;2.中国科学院南京地理与湖泊研究所, 南京 210008;3.河海大学水文水资源与水利工程科学国家重点实验室, 南京 210009;4.江西省地质局工程地质大队, 南昌 330000;5.江西省水文监测中心, 南昌 330002
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| 摘要: |
| 受地表河湖系统水情变化干扰,高度动态和异质性的洪泛区地下水文对河湖水资源、水污染以及生态环境功能等方面具有重要影响和贡献。鄱阳湖洪泛区湿地在长江中下游具有重要区位优势和研究特色,但变化环境下其水动力特征和水量交换情况等仍存在许多不确定性。本文以鄱阳湖典型洪泛区为研究区,采用地下水流二维数值模型,开展了洪泛区地表-地下水转化作用与水量变化的模拟研究。结果表明,鄱阳湖季节性水位变化很大程度上决定了主湖区与周边地下水之间的动态补排模式,即洪泛区地下水补给湖泊主要发生在枯水和退水时期,而湖泊补给地下水主要发生在涨水和高洪水位时期。一般情况下,整个洪泛区地下水位与湖水位的年内变化态势基本一致,主湖区附近的地下水位年内变幅较大,而大部分洪泛区的地下水位变幅相对较小。北部地下水流速明显大于南部,主湖区附近地下水流速明显大于洪泛区,地下水流速基本小于1~2 m/d。水均衡分析发现,洪泛区地下水系统以接受降雨输入(52%)和主湖区补给(39%)为主,以地下水蒸发输出(72%)和向湖排泄(24%)为主,但补给主要发生在春、夏季,而排泄则发生在秋、冬季。地形地貌对洪泛区地下水位分布以及流速场演化具有主控作用,但湖水位动态变化却是一个关键的外部驱动力,形成了地下水-湖水交互过程的季节转变。本文研究结果可为后续鄱阳湖洪泛区的水资源优化管理与配置以及生态环境的可持续发展提供科学支撑。 |
| 关键词: 鄱阳湖湿地 洪泛区 湖水-地下水相互作用 数值模型 水动力场 水均衡 |
| DOI：10.18307/2023.0123 |
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| 基金项目:国家重点研发计划项目(2019YFC0409002)、国家自然科学基金项目(42071036)、河海大学水文水资源与水利工程科学国家重点实验室“一带一路”水与可持续发展科技基金项目(2020491311)、江西省水文局青年科技创新基金项目(SWJJ-KT201904)、江西省水利厅科技项目(202022YBKT11)和中国科学院青年创新促进会项目(Y9CJH01001)联合资助。 |
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| Groundwater numerical simulation in the typical floodplain of Lake Poyang |
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Cao Sijia1, Li Yunliang2,3, Li Ningning4, Chen Jing3,5, Song Yanyan2, Zhao Guizhang1, Li Zhiping1
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1.School of Earth Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, P. R. China;2.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;3.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210009, P. R. China;4.Jiangxi Geological Survey, Nanchang 330000, P. R. China;5.Monitoring Center of Jiangxi Hydrology, Nanchang 330002, P. R. China
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| Abstract: |
| Groundwater dynamics and variabilities of floodplains play an important role in affecting river and lake water resources, water pollution and eco-environment functions, due to the change of its hydrological regimes. The floodplain wetlands of Lake Poyang are located strategically in the middle and lower reaches of the Changjiang River, while its dynamic behaviors of water resources and water exchanges have many uncertainties. This study focuses on the typical floodplain area of Lake Poyang. We used a two-dimensional groundwater flow model to simulate floodplain surface water-groundwater interactions and the associated exchange fluxes. The results show that floodplain groundwater recharges to lake during the dry and recession periods, while lake recharges to groundwater during the rising and flooding periods. Groundwater levels across the whole floodplain exhibit a similar variation trend to lake water levels. Variation amplitudes of groundwater levels adjacent to the main lake are distinctly higher than those of the floodplain. In general, groundwater flow velocities in the northern area are obviously higher than those in the southern area, and the main lake regions are higher than the lake's floodplain, with velocity values less than about 1-2 m/d. Water budget analysis indicates that floodplain groundwater system mainly receives rainfall (52%) and lake inputs (39%), and losses water by groundwater evaporation (72%) and discharging to lake (24%). Additionally, recharge process of the groundwater system mainly occurs during the spring and summer seasons, and discharge process occurs during the autumn and winter seasons. In conclusion, surface topographical features play a dominant role in controlling groundwater level distributions and flow fields, but the dynamics of lake water levels are regarded as a key force that leads to a seasonal variation of the lake-groundwater exchange. The outcomes of this study can provide scientific references for future water resources management, allocation, and sustainable development of the eco-environment ofthe Lake Poyang floodplain wetlands. |
| Key words: Lake Poyang wetlands floodplain area lake-groundwater interaction numerical model hydrodynamic field water budget |
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