摘要
随着金沙江上游梯级水库的建设运行,高坝泄洪导致的总溶解气体(TDG)过饱和问题较为突出,且不同泄洪强度下,过饱和TDG在深水水库中的输移特性尚不明晰。采用原型观测和立面二维数学模型相结合的研究手段,分析了不同泄洪强度情景下溪洛渡-向家坝区间过饱和TDG输移规律。结果表明:溪洛渡水库泄洪流量与泄洪时长驱动向家坝库区过饱和TDG输移衰减过程,过饱和TDG输移速率随泄洪流量及泄洪时间增大而加快,最快可达21.25 km/d;溪洛渡水库泄洪流量增加导致库区内部累积的过饱和TDG总量增加,衰减速率降低;在设计工况背景下,过饱和TDG衰减速率随泄洪时间增加而降低,当溪洛渡水库持续泄洪约24 h后,向家坝库区TDG过饱和状态趋于稳定,衰减速率最低仅为0.74%/d。
With the construction and operation of cascade reservoirs in the upper reaches of Jinsha River,the problem of total dissolved gas(TDG)supersaturation caused by high dam flood discharge is more prominent,and the transport characteristics of supersaturated TDG in deep-water reservoirs under different flood discharge intensities are still unclear.In this paper,the transport law of supersaturated TDG in the Xiluodu-Xiangjiaba section under different flood discharge intensity scenarios was analyzed by combining prototype observation and a vertical two-dimensional mathematical model.The results showed that the discharge flow quantity and discharge duration of Xiluodu Reservoir drove the attenuation process of supersaturated TDG transport to the Xiangjiaba Reservoir area.The supersaturated TDG transport rate increased with the increase in discharge quantity and discharge time,and the fastest rate could reach 21.25 km/d.The increase in flood discharge from Xiluodu Reservoir led to an increase of the total amount of supersaturated TDG accumulated and the decrease of the attenuation rate in the Xiluodu-Xiangjiaba section.Under the design conditions,the attenuation rate of supersaturated TDG decreased with the increase in flood discharge time.After the Xiluodu Reservoir had discharged for about 24 hours,the TDG supersaturation state in the Xiluodu-Xiangjiaba section tended to be stable,and the minimum attenuation rate was only 0.74%/d.
作者
申赵勇
石浩洋
侯春尧
周哲成
王智欣
郭辉
SHEN Zhaoyong;SHI Haoyang;HOU Chunyao;ZHOU Zhecheng;WANG Zhixin;GUO Hui(China Three Gorges Corporation River Basin Hub Administration Center,Yichang 443100,China;Institute of Hydraulics,Changjiang River Scientific Research Institute,Wuhan 430010,China;Hubei Provincial Laboratory of Water Resources and Ecological Environment Science,Changjiang River Scientific Research Institute,Wuhan 430010,China;Xiluodu Power Plant,China Yangtze Power Co.,Ltd.,Zhaotong 657000,China;College of Water Resources and Hydropower,Hohai University,Nanjing 210098,China)
出处
《人民长江》
北大核心
2023年第12期179-187,共9页
Yangtze River
基金
国家重点研发计划项目(2022YFC3203904)
国家自然科学基金项目(52130903)
中央级科研院所基本科研业务费(CKSF2023401/SL)
中国长江三峡集团有限公司科研项目(0704179)。
关键词
过饱和TDG
泄洪流量
泄洪时间
数值模拟
深水库区
溪洛渡水库
向家坝水库
supersaturation total dissolved gas(TDG)
flood discharge quantity
discharge time
numerical simulation
deep-water reservoir area
Xiluodu Reservoir
Xiangjiabo Reservoir
