[1]DAI Wen,ZHANG Meizhu,WANG Jinfeng,et al.Runoff Characteristics in the Three Outlets of Southern Jingjiang River Based on the Variation of Water System Connection Function[J].Research of Soil and Water Conservation,2021,28(01):380-386.
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Runoff Characteristics in the Three Outlets of Southern Jingjiang River Based on the Variation of Water System Connection Function
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 01
Page number:
380-386
Column:
Public date:
2021-01-10
- Title:
- Runoff Characteristics in the Three Outlets of Southern Jingjiang River Based on the Variation of Water System Connection Function
- Keywords:
- connecting function of water system; fuzzy comprehensive evaluation; non-uniformity coefficient; Morlet wavelet analysis; the three Outlets of Southern Jingjiang River
- CLC:
- TV213.4
- DOI:
- -
- Abstract:
- In order to investigate the influence of the connectivity of the river system on the runoff of the river basin, taking the three Outlets of Southern Jingjiang River Basin as the research object, we used the fuzzy comprehensive assessment method to evaluate the connectivity of the river system, and used the monthly runoff accounted for the annual runoff percentage, the annual uneven distribution coefficient, Morlet wavelet analysis, Sen's slope and other methods to quantitatively analyze the runoff characteristics of the three Outlets of Southern Jingjiang River Basin under the variation of the connectivity of the water system. The results showed that:(1)the connectivity of the water system of the three Outlets of Southern Jingjiang River-watershed changed from Grade I in 1956 to Grade Ⅲ in 1989 to Grade Ⅱ in 2008, remained Grade Ⅱ in 2016, and the year of 1989 was the year of variation in the connectivity of the water system; before and after the variation, there were differences in indicators such as the channel cutoff rate, channel cutoff rate after the variation was greater than before the variation;(2)under the variation of the connectivity function of the river system, the monthly runoff percentage of the annual runoff in the three Outlets of Southern Jingjiang River was more concentrated in the flood months, and the coefficient of uneven distribution during the year increased, indicating that the distribution of runoff during the year was more uneven, which was likely to cause drought and flood disasters;(3)the periodic change scale of the runoff sequence evolution process under the variation of the connectivity of the water system changed from 3～6 years, 7～18 years, 22～32 years to 3～6 years, 7～8 years, 9～12 years, 13～16 years, and the first main cycle reduced from 12 to 13 years, the second main period reduced by 3 to 4 yrears, and the third main period reduced by 1 to 2 years; the number of runoff shocks increased by 1 to 4 times, indicating that the frequency of runoff alternation between three Outlets of Southern Jingjiang River watershed was obvious;(4)the runoff trend of the three Outlets of Southern Jingjiang River watershed changed to various degrees under the variation of the connectivity of the river system; runoff of the Songzi River West Branch, the Songzi River East Branch, the Hudu River Runoff, and the Wuchi River West Branch decreased significantly, and the runoff reduction rate of Songzi River West Branch was faster; The runoff reduction rates of the eastern branch of the Songzi River and the western branch of the Muchi River slowed down, and the runoff reduction rate of the runoff of the Hudu River increased slightly, but there was no significant change in the eastern branch of the Muchi River.
- References:
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Last Update:
2021-01-15