| Response characteristics of runoff to precipitation variation in Tuwei river basin |
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| DOI：10.7606/j.issn.1000-7601.2017.04.23 |
| Key Words: runoff precipitation variation response characteristics Tuwei river |
| Author Name | Affiliation | | LIU Jing | College of water resources and architectural engineering, Northwest A&F university, Yangling, Shaanxi 712100, China | | YAN Bao-wen | College of water resources and architectural engineering, Northwest A&F university, Yangling, Shaanxi 712100, China | | WANG Shuang-yin | College of water resources and architectural engineering, Northwest A&F university, Yangling, Shaanxi 712100, China | | SUN Zhao-feng | College of water resources and architectural engineering, Northwest A&F university, Yangling, Shaanxi 712100, China |
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| Abstract: |
| In order to study the response characteristics of runoff to precipitation in Tuwei river basin, the response of runoff to precipitation at different length of time was explored on the basis of the relationship analysis of annual and seasonal rainfall-runoff obtained through double mass curve and correlation analysis, and a quantitative analysis was made on the degree of the response of runoff to precipitation changes with multiple linear regression method. Results showed: (1) Annual runoff decreased significantly, while the annual precipitation decreased at first and then increased. (2) Seasonal runoff significantly decreased, and the variation of annual runoff was in accord with summer runoff. Precipitation in spring increased, decreased in summer, decreased at first and increased then in autumn and winter. Variation of annual precipitation was mainly affected precipitation in summer and autumn. (3) The correlation between runoff in summer and precipitation in summer was the most significant, and the weakest in winter. Annual runoff was relevant most to the maximum precipitation of one month, which was followed by summer. (4) Compared to the baseline period, during soil and water conservation effect period (1978—1998) response proportion of runoff to precipitation change was 27.4%, and human activities and other factors accounted for 72. 6%, 13.9% of which was water intake. In resources development period (1999—2000), response proportion of annual runoff to precipitation was 21.4%, and human activities and other factors accounted for 78. 6%, 17.4% of which was water intake. Human activities were the major factor accounting for runoff reduction since the large-scale activities of human beings. The proportion of water taking increased, and the effect of rainfall on runoff decreased. |
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