| 1996~2017年枯水期地下水排泄对洞庭湖水量均衡的贡献及其时间变异性 |
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| 引用本文： | 孙晓梁,杜尧,邓娅敏,陶艳秋,马腾.1996~2017年枯水期地下水排泄对洞庭湖水量均衡的贡献及其时间变异性[J].地球科学,2021,46(7):2555-2564. |
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| 作者姓名： | 孙晓梁 杜尧 邓娅敏 陶艳秋 马腾 |
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| 作者单位： | 1.中国地质大学地质调查研究院, 湖北武汉 430074 |
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| 基金项目： | 中国地质调查局项目121201001000150121中国地质调查局项目12120114069301 |
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| 摘 要： | 地下水排泄在湖泊水量及营养盐均衡中发挥着重要作用，其中地下水向湖泊排泄的量化是关键，但目前对其时间变异性的研究却十分薄弱.针对这一科学问题，以长江中游重要调蓄湖泊-洞庭湖为例，通过收集1996~2017年洞庭湖流域的水文和气象数据，基于质量平衡模型，查明地下水排泄对洞庭湖水量均衡的贡献以及地下水向洞庭湖排泄强度随时间的变化.结果显示:（1）枯水期时地下水排泄量为（0.17~1.51）亿m3/d，地下水排泄强度为38.74~207.26 mm/d，地下水排泄对湖泊水量均衡的贡献为8.70%~30.37%；（2）地下水排泄量、地下水排泄强度、地下水排泄对湖泊水量均衡的贡献在1996~2017年间均呈现出明显的先降低再升高的变化趋势，三峡水库蓄水后至三峡工程全面竣工初期的地下水排泄相较于三峡水库蓄水前和三峡工程全面运行后显著降低；（3）三峡工程运行对长江水位及地下水位的改变可能是引起湖底地下水排泄时间变异性的重要原因.为洞庭湖区域的水量均衡提供了新的认识，也为今后洞庭湖区域水资源开发利用和区域生态安全管理提供了理论支撑.
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| 关 键 词： | 地下水 洞庭湖 质量平衡模型 时间变异性 水量均衡 |
| 收稿时间： | 2020-07-07 |
Contribution and Its Temporal Variation of Groundwater Discharge to the Water Mass Balance of Dongting Lake from 1996 to 2017 |
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| Sun Xiaoliang,Du Yao,Deng Yamin,Tao Yanqiu,Ma Teng.Contribution and Its Temporal Variation of Groundwater Discharge to the Water Mass Balance of Dongting Lake from 1996 to 2017[J].Earth Science-Journal of China University of Geosciences,2021,46(7):2555-2564. |
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| Authors: | Sun Xiaoliang Du Yao Deng Yamin Tao Yanqiu Ma Teng |
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| Abstract: | Groundwater discharge plays an important role in lake water and nutrient mass balance, for which the key is to quantify lacustrine groundwater discharge (LGD). However, the temporal variation of LGD has been poorly known. In response to this scientific problem, this study takes the important lake in the middle reaches of the Yangtze River-Dongting Lake as an example. By collecting hydrological and meteorological data from the Dongting Lake basin in 1996-2017, the contribution of groundwater discharge to Dongting Lake and the temporal variation of LGD rate were determined based on the mass balance model. The results indicated that: (1) The LGD volume during the dry season was (0.17-1.51)×108 m3/d, the LGD rate was 38.74-207.26 mm/d, and the contribution of LGD to Dongting Lake was 8.70%-30.37%; (2) the LGD volume, rate and its contribution to Dongting Lake showed a decreasing tendency during 2003-2010 and an increasing tendency during 2010-2017, and the LGD from the impoundment of the Three Gorges Reservoir to the completion of the Three Gorges Project was significantly lower than that before the impoundment of the Three Gorges Reservoir and the completion of the Three Gorges Project; (3) the changes of the Yangtze River stage and groundwater table induced by the operation of the Three Gorges Project may be an important cause for the temporal variability of LGD. This study provides a new understanding of the water balance in the Dongting Lake area, as well as the theoretical support for the future utilization of water resources and regional ecological security management in the Dongting Lake area. |
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