干旱区地理2024，Vol.47Issue(12)：2115-2123,9.DOI:10.12118/j.issn.1000-6060.2023.646
哈密市峡沟水库中小洪水特征及气象成因
Characteristics and meteorological causes of medium and small floods in Xiagou Reservoir of Hami City
摘要
Abstract
Using water regime data from Xiagou Reservoir and Yiwu Hydrological Station in Yiwu County,Hami City,Xinjiang,China alongside hourly precipitation observations from five automatic weather stations in the res-ervoir's upstream basin,routine upper-air observations,and NCEP reanalysis data,this study analyzed the hydro-logical characteristics and precipitation features of eight medium and small flood events at Xiagou Reservoir dur-ing 2015-2022.The findings are as follows:(1)Upstream-type floods exhibit peak durations within 10 hours,with concentrated flood volumes and stable rising and falling stages.In contrast,downstream-type floods rise rap-idly and have peak durations exceeding 10 h.While the average rainfall and maximum hourly rainfall intensity of upstream-type flood-inducing heavy precipitation are lower than those of downstream-type,and the average rain-fall duration is longer.The flood peak durations exceeding the blue warning threshold are shorter for upstream-type floods,and their corresponding maximum peak discharge,highest water level,and reservoir storage increase are significantly less than those of downstream-type floods.(2)A positive correlation exists between the peak dis-charge at Yiwu Hydrological Station and maximum rainfall during different time periods within the basin above the reservoir.The peak discharge shows the strongest correlation with maximum 3-hour precipitation at upstream meteorological stations and maximum 6-hour precipitation at downstream meteorological stations.(3)During downstream-type flood-inducing heavy precipitation,the 100 hPa South Asian High adopts a double-lobed struc-ture,with the Central Asian long-wave trough and 500 hPa low trough positioned further south compared to up-stream-type floods,while the subtropical high is located further north.Specific humidity between 700 hPa and 500 hPa,the 700 hPa moisture flux and vorticity,and the pseudo-equivalent potential temperature between 700 hPa and 500 hPa are higher during downstream-type flood-inducing heavy precipitation,serving as favorable indi-cators for forecasting such events.This study provides insights into the distinct characteristics of upstream-and downstream-type floods and offers valuable indicators for forecasting flood-inducing heavy precipitation.关键词
峡沟水库/洪水特征/环流特征/洪峰流量Key words
Xiagou Reservoir/flood characteristics/circulation features/peak discharge引用本文复制引用
白松竹,关清,江远安,栾亚睿,张俊..哈密市峡沟水库中小洪水特征及气象成因[J].干旱区地理,2024,47(12):2115-2123,9.基金项目
新疆维吾尔自治区重点研发任务专项(2022B03027-3)资助 （2022B03027-3）
