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111 / 2024-02-06 16:53:45
Groundwater dynamics in a Zoige peatland watershed on the northeastern Qinghai-Tibet Plateau
Groundwater；water level; peatland; gully erosion
Subtheme 2: Integrated Water Resources Management
摘要录用
Zhiwei Li / ； Wuhan University；State Key Laboratory of Water Resources Engineering and Management
Zixuan Liu / Changsha University of Science & Technology
Shimin Tian / Yellow River Institute of Hydraulic Research







Zoige basin is the largest alpine peatland in China, which plays a vital role in water conservation, carbon sequestration, and biodiversity protection. The change of groundwater level is an important aspect of the hydrological processes in peatland, which directly affects the annual fluctuation of water conservation. However, the spatiotemporal change of groundwater level is still an unclear problem to be in situ monitored. In this study, a typical peatland watershed in the upper Black River in the Zoige Basin in the Source Region of the Yellow River was selected. The groundwater level monitoring data, meteorological data, and unmanned aerial vehicle aerial survey data in 2018-2022 were used to statistically analyze the spatiotemporal changes of the groundwater level in the peatland watershed and calculate the water depth and discharge process of the channel outlet in the watershed. Results show that the changing trend of groundwater level in the watershed is consistent with that of precipitation, which increases with the increase of the ratio of precipitation to evaporation, indicating that precipitation is the dominant factor of groundwater level dynamics. The groundwater level in the monitoring points in the middle sites fluctuates more violently than that in the upper sites, and the average value of groundwater level in the upper sites is higher than that in the middle sites, indicating that the water storage capacity in the middle portion is decreasing. Finally, the empirical relationship between gully water depth and discharge in the watershed is obtained, and the daily discharge is calculated. With the increase of gully depth along the course, groundwater discharge rate and drainage zone range will increase. Along the gully cutting through the peat layer, the maximum drainage zone reaches 16.5 m. This study reveals the groundwater dynamics and discharge process in the typical peatland, which is of importance for understanding runoff variation, wetland shrinkage, and functional degradation in the alpine peatland.

重要日期

  • 会议日期

    10月14日

    2024

    至

    10月17日

    2024

  • 09月30日 2024

    初稿截稿日期

  • 10月17日 2024

    注册截止日期

主办单位
国际水利与环境工程学会亚太地区分会
承办单位
长江水利委员会长江科学院
四川大学
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