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| DOI：10.13522/j.cnki.ggps.2023220 |
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| Spatial and Temporal Dynamic Characteristics of Groundwater Burial Depth at Different Levels and Its Response to Precipitation in Changping District, Beijing |
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GUAN Ning, BI Huaxing, ZHANG Qingtao, LI Susu, JIAO Zhenhuan
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1. College of Soil and Water Conservation,Beijing Forestry University, Beijing 100083, China; 2. State Key Laboratory of Efficient Production of Forest Resources, Beijing 100083, China; 3. Key Laboratory of State Forestry and Grass Administration on Soil and Water Conservation, Beijing 100083, China; 4. Beijing Engineering Research Center of Soil and Water Conservation,
Beijing 100083, China; 5. Engineering Research Center of Forestry Ecological Engineering. Ministry of Education,
Beijing 100083, China; 6. Changping Hydrology and Water Quality Monitoring Center, Beijing 102200, China
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| Abstract: |
| 【Objective】 To explore the temporal and spatial dynamic characteristics of groundwater depth at different levels and its response to precipitation in Changping District, Beijing. 【Method】Based on the measured groundwater depth data and precipitation observation data from 98 automatic groundwater monitoring Wells (75 shallow Wells, 16 deep Wells, and 7 bedrock Wells) in Changping District, Beijing from 2021 to 2022, combined with Kriging interpolation method and cross-correlation method, The spatial distribution, temporal dynamic change of groundwater depth and its response to precipitation at different levels in Changping District are analyzed. 【Result】The spatial distribution of groundwater depth in Changping region was higher in the southeast and lower in the northwest. In shallow groundwater depth, there was a descending funnel in both observation years; in deep groundwater, there was a descending funnel in 2021, but it disappeared in 2022; in bedrock groundwater depth, there was no descending funnel. The spatial variability of buried depth distribution of deep groundwater is obviously higher than that of shallow and bedrock layers. The shallow groundwater and deep groundwater showed a simultaneous increase or decrease trend in each month, with the maximum buried depth appearing in June 2021 and May 2022, and the minimum buried depth appearing in December 2021 and December 2022, respectively. The monthly variation of groundwater depth in bedrock is obviously different from that in shallow layer and deep layer. The overall variation of groundwater depth in different layers on the monthly scale is bedrock layer > deep layer > shallow layer. 【Conclusion】The overall groundwater depth in 2021 is higher than that in 2022, which is related to the inter-annual variation of precipitation. The response of groundwater to monthly precipitation is different in different layers, and the response of groundwater depth of bedrock to precipitation has an obvious lag time of 6 months. There is no obvious time lag between shallow and deep groundwater. |
| Key words: Changping District; groundwater; precipitation; response time lag |
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