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71.
黑河径流时空演变规律分析 总被引:4,自引:2,他引:4
以黑河的祁连站、莺落峡站和正义峡站为代表站,选取1945~2000年的月平均径流资料,采用Mann-Kendall趋势检验法和谱分析方法对黑河径流的趋势变化和周期变化进行分析,结果表明:近半个世纪以来,黑河流域的径流呈现出明显的减少趋势,并显示出2~3年和9年的周期变化规律. 相似文献
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城市暴雨内涝与极端降雨事件息息相关。为揭示城市暴雨内涝成因,利用海口站1953-2012年日降雨量资料,采用线性倾向估计法、Mann-Kendall趋势检验法、Mann-Kendall突变检验法和小波分析法等探讨了海口市极端降雨事件演变规律。结果表明:近60年来海口市极端降雨指标均呈现出上升趋势,但极端降雨日数上升趋势较弱,短历时暴雨强度增加,对城市内涝带来较大压力;极端降雨事件的突变年份在2007年附近,暗示海口市在2007年附近对土地的开发利用是一个节点;海口市降雨周期性不是很显著。 相似文献
73.
为揭示普洱市相对湿度的变化趋势,以普洱市6个气象站1961-2015年共55年逐日相对湿度序列为研究对象,采用线性回归分析和Mann-Kendall检验法对普洱市年和四季相对湿度的趋势性和突变性进行分析,结果表明:①普洱市相对湿度年内变化曲线呈现单峰单谷型,相对湿度最小出现在3月,7月达到最大,夏秋季节均在80%以上;②近55年来,普洱市年和四季平均相对湿度均呈现出显著减少趋势,其平均变化速率为-0.81%/10年,从四季来看,冬季相对湿度减小幅度最大,夏季、秋季次之,春季最小;③普洱市各站平均相对湿度在空间上也存在差异,整体呈现自西北到东南逐渐增加的规律。 相似文献
74.
Unusually severe weather is occurring more frequently due to global climate change. Heat waves, rainstorms, snowstorms, and droughts are becoming increasingly common all over the world, threatening human lives and property. Both temperature and precipitation are representative variables usually used to directly reflect and forecast the influences of climate change. In this study, daily data (from 1953 to 1995) and monthly data (from 1950 to 2010) of temperature and precipitation in five regions of the Amur River were examined. The significance of changes in temperature and precipitation was tested using the Mann-Kendall test method. The amplitudes were computed using the linear least-squares regression model, and the extreme temperature and precipitation were analyzed using hydrological statistical methods. The results show the following: the mean annual temperature increased significantly from 1950 to 2010 in the five regions, mainly due to the warming in spring and winter; the annual precipitation changed significantly from 1950 to 2010 only in the lower mainstream of the Amur River; the frequency of extremely low temperature events decreased from 1953 to 1995 in the mainstream of the Amur River; the frequency of high temperature events increased from 1953 to 1995 in the mainstream of the Amur River; and the frequency of extreme precipitation events did not change significantly from 1953 to 1995 in the mainstream of the Amur River. This study provides a valuable theoretical basis for settling disputes between China and Russia on sustainable development and utilization of water resources of the Amur River. 相似文献
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Kim KH Shon ZH Nguyen HT Jung K Park CG Bae GN 《The Science of the total environment》2011,409(19):3801-3811
Concentrations of total gaseous mercury (TGM) were measured continuously at four urban residential locations (G (Guro-gu); N (Nowon-gu); S (Songpa-gu); and Y (Yongsan-gu)) in Seoul, Korea from 2004 to 2009. The mean concentrations of Hg at these sites were found on the order of N (3.98 ± 1.68 ng m− 3), S (3.87 ± 1.56 ng m− 3), G (3.80 ± 1.60 ng m− 3), and Y (3.36 ± 1.55 ng m− 3). Evidence indicates that the spatial distribution of Hg should be affected by the combined effects of both local anthropogenic (incineration facilities and thermal power plants) and natural (soil) emission sources in association with the meteorological parameters. Inspection of the Hg temporal patterns indicates the co-existence of contrasting seasonal patterns between the central site Y (winter dominance) and all other outbound sites near city borders (summer dominance). The long-term trend of Hg, if examined by combining our previous studies and the present one, shows that Hg levels in this urban area declined gradually across decadal periods despite slight variabilities in spatial scale: (1) above 10 ng m− 3 in the late 1980s, (2) ~ 5 ng m− 3 in the late 1990s, and (3) ~ 3 ng m− 3 toward the late 2000s. The results of the principal component analysis along with observed differences in seasonal patterns (between study sites) suggest that Hg distributions between different urban sites are greatly distinguishable with strong source signatures at each individual site. 相似文献
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