| Cite this article: | 张可心.气候变化下陇东地区近60年地表水资源变化特征分析[J].灌溉排水学报,,():-. |
| Zhang Kexin.气候变化下陇东地区近60年地表水资源变化特征分析[J].灌溉排水学报,,():-. |
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| DOI： |
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| Analysis on the Change Characteristics of Surface Water Resources in Longdong Area under Climate Change in Recent 60 Years |
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Zhang Kexin
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Qingyang Meteorological Bureau
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| Abstract: |
| Based on the data of surface runoff in the Longdong Area and meteorological elements such as precipitation and temperature from the National Weather Station, this paper analyzed the changes of surface water resources and its influencing factors in the east of Gansu under the background of climate change. The results are as follows: During the period from 1956 to 2016, the surface water resources in Longdong area showed a significant downward trend. The runoff of the Jinghe, Malian and Puhe Rivers has been reduced by 1.05×108 m3, 0.28×108 m3, and 0.28 ×108 m3 for every 10 years on average.The seasonal surface runoff was: summer >autumn > spring > winter. The runoff was unevenly distributed throughout the year, all showed "single peak", with the peak mainly concentrated in July to September. The high-water periods of the Jinghe, Malian, and Puhe rivers were all before 1980s, and the low-water period started in 1990s. Mann-Kendall mutation test showed that the decreasing trend has reached a very significant level after the 21st century. The analysis of meteorological elements showed that the precipitation has a weak increasing trend, while the temperature and potential evapotranspiration all have a significant increasing trend. Pearson correlation coefficient analysis showed that precipitation and potential evapotranspiration are the main factors affecting surface runoff changes in Longdong area, and the correlation is relatively high. The annual average temperature has a high correlation with the annual runoff of the Jinghe and Puhe rivers, but a weak correlation with the Malian river. |
| Key words: climate change; Longdong area; Surface water resources; Mann-Kendall mutation test |
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