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- Title
郭城驿流域水沙演变对降水和水保措施的响应.
- Authors
周 蕊; 张 富; 李晓雅; 靳 峰; 胡彦婷; 赵秀兰
- Abstract
In order to understand the climate change trend (precipitation) and the process and medumism of runoff and transportation of sediments in the Guochengyi watershed which is located in the semi-arid loess northern China and provide theoretical support and technical guidance for local soil and water conservation work, this study was aimed with the following objectives. In order to calculate the average rainfall of the basin area, Tyson polygon method was used. In addition, in order to find the climate change trend (annual precipitation) and analyze the annual runoff and annual sediment transport, Mann-Kendall test method was used in this study. Moreover, to estimate the dynamic cycle of rainfall, runoff and sediment transport annually, Morlet wavelet analysis was performed. Furthermore, regression analysis was done in order to check the multivariate function i.e. the relationship between runoff and sediment transportation annually with annual precipitation and treatment degree of river basin. The results show that the long-term annual precipitation in Guochengyi watershed from 1957 to 2016 has periodic changes in three-time scales of 16-32 a, 6-16 a and 3 -6 a respectively. There is no significant reduction trend in the whole study period. The annual runoff and sediment transport have notably periodic changes in three-time scales of 16-32 a, 6-12 a and 3-6 a respectively. The consequences show that during the study period, the annual sediment discharge decreases significantly on the whole and the decrease of annual sediment discharge is greater than that of annual runoff. Additionally, the annual runoff and annual sediment transport increase with the increase of annual precipitation and decrease with the increase of control degree. The annual runoff and annual sediment transport have a strong relationship with annual rainfall and watershed treatment degree. The main reason for the noticeably reduction of annual runoff and sediment transport under the condition of non-significant annual precipitation reduction is that the degree of watershed management is greatly improved, especially closely related to the construction of terraced fields and afforestation and grass planting.
- Publication
Yellow River, 2021, Vol 43, Issue 5, p116
- ISSN
1000-1379
- Publication type
Article
- DOI
10.3969/j.issn.1000-1379.2021.05.022