Variations in water and sediment fluxes in Oujiang River during flooding and non-flooding seasons

doi:10.3969/j.issn.1001-909X.2023.02.005

Abstract

Abstract:

Oujiang River is a typical mountain river whose water and sediment fluxes are characterized by a great disparity between flood and dry seasons. Based on the measured data of water discharge and sediment load at the mainstream control hydrological station of Oujiang River in the past 71 years (1950—2020) and 43 years (1956—1998), respectively, the coefficient of nonuniformity, Mann-Kendall non-parametric statistical test and double mass curve were used to analyze the variations of runoff and sediment load during the flood seasons (including plum rain season from April to June and typhoon season from July to September) and dry seasons (non-flooding season from October to March in next year) in the Oujiang River. The results showed that: (1) The peak and valley month of runoff were the same as sediment load. The peak month of both runoff and sediment load appeared in June, while their valley month appeared in December. The plum rain season was the most important period of water and sediment transporting to sea from Oujiang River. (2) The runoff showed significant decreasing trend in the plum rain season, significant increasing trend in non-flooding season, and non-significant trend in typhoon season during 1950—2020 in Oujiang River. The nonuniformity of intra-annual distribution for runoff had become more uniform obviously, resulting from the regulation of reservoirs. (3) The sediment load showed significant decreasing trend in the plum rain season due to the interception of reservoirs, and no significant trend in typhoon season and non-flooding season during 1956—1998 in Oujiang River. The nonuniformity of intra-annual distribution for sediment load showed little change, which might relate to the nonuniformity of intra-annual distribution for precipitation. (4) The relationship between sediment load and runoff during typhoon and non-flooding season changed in 1975 and 1959, respectively, both of which were related to the heavy rainfall within the river basins.

Key words: Oujiang River, flooding season, non-flooding season, water and sediment fluxes, the nonuniformity coefficient

CLC Number:

ZHANG Wanying, LU Shasha, XIA Xiaoming, LIU Jingui. Variations in water and sediment fluxes in Oujiang River during flooding and non-flooding seasons[J]. Journal of Marine Sciences, 2023, 41(2): 61-70.

Figures/Tables 10

Fig.1 Study area

Fig.2 Multi-year monthly average water discharge, sediment load and precipitation in Oujiang River

Fig.3 The variations of the nonuniformity coefficients for runoff, sediment load and precipitation in Oujiang River

Fig.4 The change trends of water discharge during 1950-2020 in Oujiang River

Fig.5 The change trends of sediment load during 1956-1998 in Oujiang River

Fig.6 The change trends of precipitation during 1960-2019 in Oujiang River

Fig.7 Double mass curves of annual runoff and precipitation in Oujiang River

Fig.8 Double mass curves of annual sediment load and runoff in Oujiang River

Tab.1 The values of Cv for precipitation and runoff before and after the construction of reservoirs as well as their changing rates

项目	C_v
项目	建库前	建库后	变化率
降水量	0.57	0.55	-3.5%
径流量	0.91	0.74	-18.7%

Tab.2 The average runoff and sediment load before and after the construction of reservoirs during plum rain, typhoon and non-flooding seasons as well as their changing rates

时期	年均径流量			年均输沙量
时期	建库前/(10⁸ m³·a^-1)	建库后/(10⁸ m³·a^-1)	变化率/%	建库前/(10⁷ kg·a^-1)	建库后/(10⁷ kg·a^-1)	变化率/%
梅汛期	67.2	68.6	2.1	101.9	83.5	-18.1
台汛期	31.4	40.3	28.3	57.5	80.9	40.7
非汛期	32.8	41.8	27.4	14.1	16.4	16.3

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