Variation and reason analysis of temperature and precipitation of Weihe River in Guanzhong area in the last 60 years
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Abstract:
The identification of changes and reasons for hydrological factors has practical significance for resource utilization and the ecological health of river basin. Based on the data from 1951-2013 of Weihe River in Guanzhong area, the trend and mutation of temperature and precipitation were analyzed with linear regression, Mann-Kendall test, concentration degree and concentration time. The change reasons of temperature and precipitation were elaborated. The results were as follows: 1) The annual average temperature showed a significant increasing trend, with 0.206℃/10a, and winter contributed most. Obvious mutations occurred in the mid-1990s for the annual and seasonal mean temperature. 2) The annual precipitation showed an insignificant decrease of about 0.5775 mm per year. Spring and autumn contributed greatly to the downward trend. The mutations were complicated, with varying degrees in each era. The distribution of precipitation was stable, with concentration degree and concentration time remaining at 0.5~0.6 and in July, respectively. 3) The changes of temperature and precipitation were mainly the combined results of natural factors and human factors. Natural factors included solar activity, atmospheric circulation and monsoon impact, and the human factors were mainly greenhouse gas emissions and land cover changes.
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