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Impacts of climate change/variability on the streamflow in the Yellow River Basin, China

机译：气候变化/变异性对中国黄河流域水流的影响

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摘要

Changes of streamflow reflect combined effects of climate, soil and vegetation in the basin scale. This study was conducted to investigate the response of streamflow to the climate changes/variability in different scales of the Yellow River Basin (YRB). The spatial distribution and temporal trends were explored for precipitation and potential evapotranspiration (PE) during 1961-2000 to illustrate climate change/variability and impacts of climate change/variability on streamflow were explained by investigating the relationship of precipitation, PE and streamflow in the YRB. The results presented that: (i) precipitation and PE exhibited different spatial distribution patterns and temporal trends in different regions, and most stations showed negative trends for precipitation in the basin; (ii) the relationship of streamflow with precipitation and PE showed high nonlinearity, and the magnitudes and patterns of streamflow response to precipitation and PE displayed different patterns varied with the dry conditions in different region or years; and (iii) the precipitation elasticity of streamflow (e{open}_P) was 1.80, 1.08, 1.78 and 1.95 in Lanzhou, Toudaoguai, Huayuankou and Lijin respectively, while the PE elasticity of streamflow (e{open}_(ET)) was -3.41, -4.40, -4.52 and -4.20 in above four scales, respectively, from which can be seen that streamflow was more sensitive to precipitation in wet region than in arid region and inversely it was more sensitive to PE in arid regions than in wet regions. Furthermore, precipitation elasticity of streamflow calculated from the partial correlation presented a reasonable result to show the combined effect of precipitation and PE on streamflow.
机译：径流的变化反映了流域尺度上气候，土壤和植被的综合影响。进行这项研究以调查黄河流域（YRB）不同尺度下水流对气候变化/变化的响应。探索了1961-2000年期间降水和潜在蒸散量（PE）的空间分布和时间趋势，以说明气候变化/变异性，并通过调查YRB中的降水，PE和流量的关系解释了气候变化/变异性对水流的影响。 。研究结果表明：（i）降水和PE在不同地区表现出不同的空间分布格局和时间趋势，大多数台站的降水呈负趋势; （ii）径流与降水和PE的关系表现出高度的非线性，并且径流和降水对PE和PE的响应的大小和模式显示出不同的模式，这取决于不同地区或年份的干旱条件; （iii）兰州，头岛拐，花园口和利津的水流降水弹性（e {open} _（ET））分别为1.80、1.08、1.78和1.95，而水流的PE弹性（e {open} _（ET））在以上四个尺度上分别为-3.41，-4.40，-4.52和-4.20，从中可以看出，在湿润地区，水流对降水的敏感性高于干旱地区，而在干旱地区，水流对PE的敏感性高于干旱地区在潮湿的地区。此外，由偏相关性计算得到的水流的降水弹性给出了合理的结果，表明降水和PE对水流的综合影响。

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