| Cite this article: | 岳永杰,乌云珠拉,李旭,等.根河流域近40年来气候和径流的变化特征分析[J].灌溉排水学报,2020,(5):-. |
| yueyongjie,wuyunzhula,lixu,et al.根河流域近40年来气候和径流的变化特征分析[J].灌溉排水学报,2020,(5):-. |
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| DOI： |
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| Analysis of climatic and hydrological changes in the GEN he river basin over the past 40 years |
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yueyongjie1, wuyunzhula1, lixu1, wangyaqian2, yilixi2
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1.Inner Mongolia Agricultural University;2.College of forestry, Inner Mongolia agricultural university
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| Abstract: |
| The genhe river basin is located in the cold temperate zone of China. The climate and natural environment are quite special, with a large area of permafrost, which is very sensitive to climate change.[objective] to explore the relationship between climate and hydrology by analyzing the changes of meteorology and hydrology in the gen river basin, and to provide theoretical basis for the scientific management of water resources in the basin.[methods] this paper took the gen river basin of erguna system as the research object, and used m-k test and Hurst index to analyze the meteorological and hydrological change trend and interaction relationship of the gen river basin in recent 40 years.[results] (1) the annual average temperature in the gen river basin increased by 1.1℃ during the period from 1980 to 2017, and tended to increase at the level of alpha =0.01, with a strong continuous upward trend (H=0.75).Among them, the temperature change in the growing season was the most intense (Z=4.63).(2) the growing season precipitation in the geen river basin accounts for 85% of the annual precipitation, and the growing season precipitation in the geen river basin tends to decline, with a decline rate of 1.68mm/a.
(3) relative humidity of air in the gen river basin during the initial freezing period and the complete freezing period decreased significantly at the levels of a =0.001 and a =0.01, and the decline trend was very persistent (H=1.0), with a change range of 0.05%/a.
(4) the runoff in the genhe river basin tends to decline, and the abrupt change occurs in 1997 and 1999, which is basically consistent with the abrupt change of annual precipitation, and the change trend of rainfall and runoff is consistent. The correlation analysis shows that the correlation coefficient of rainfall and runoff is 0.91.
(5) the correlation coefficient between runoff and average annual temperature in the gan river basin is 0.50. Temperature mainly influences runoff by increasing evapotranspiration of various factors in the basin, as well as the freezing and melting time or area of soil and river. |
| Key words: GEN he river basin;Mann-Kendall trend;climate change;trend analysis |
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