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三峡水库对长江中游水文过程和地下水循环的影响
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摘要
基于1965~2015年长江中游4个水文站实测水文资料,利用Mann-Kendall趋势性检验法、突变性检验法、小波分析法及数值模拟法,系统分析了长江中游年径流的趋势性、突变性和周期性特征以及周边地下水循环变化特征。研究结果表明:过去51年宜昌站、监利站、螺山站和汉口站径流均呈下降趋势,未来保持下降趋势的可能性很大,并且径流序列在2001年、2006年、2003年和2005年发生突变:长江中游年径流呈现多种周期不同尺度的振荡特性,变化周舛以11~13a和24~27a最为显著。三峡水库运行后长江中游径流集中度在减小,径流量呈下降趋势,年际变异系数增加。三峡水库运行后洪湖地区长江补给地下水天数增加至200d以上,地下水排泄方式由以蒸发排泄和河流排泄为主转变为蒸发排泄和侧向排泄。
Based on the measured hydrological data from 1965 to 2015 from four hydrological stations,the Mann-Kendall test method,mutation test method and wavelet analysis method were adopted to diagnose the tendency,mutation and periodicity of annual runoff in the middle reaches of the Yangtze River.The groundwater numerical simulation method was also used for a systematic study on the variation characteristics of groundwater circulation alongshore.The results indicated that annual runoff of Yichang,Jianli,Luoshan and Hankou stations had shown a declining trend in the past 51 years through Mann-Kendall test method and would maintain the decreasing tendency in the future through R/S analysis.Annual runoff of these stations had significant changes,which respectively occurred in 2001,2006,2003 and 2005.[t was also found that the hydrologic meteorological oscillation over the middle reaches of the Yangtze River presented a variety in time scales.Annual runoff variations were mostly in time periods of 11-13 years and 24-27 years over the middle reaches.Since the Three Gorges Reservoirs(TGR) operation,the concentration degrees(RCD) and the amount of runoff have been decreasing.While,the interannual variation coefficient has increased.In addition,the period,when the Yangtze River recharged groundwater in Honghu,has increased to over 200 days.The groundwater discharge has changed from the form of evaporation and river discharge to the form of evaporation and lateral discharge.
引文
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