皇甫川流域水沙变化特征及其影响因素

doi:10.13866/j.azr.2021.06.02

Abstract

Abstract:

Based on monitoring data of precipitation, runoff, and sediment discharge in the Huangfuchuan basin during 1954-2018, the characteristics of water and sediment cycle evolution in Huangfuchuan basin were studied using linear trend methods, Mann-Kendall tests, and cumulative anomaly methods. The contribution rates of precipitation change and human activities to runoff and sediment transport change in the Huangfuchuan basin were quantitatively evaluated using hydrological analysis methods. The results show that precipitation does not significantly decrease with time, whereas runoff and sediment transport significantly decrease with time, with a greater decreasing trend in runoff than sediment transport. The abrupt change of runoff and sediment transport from abundant to dry occurred in 1986. Using 1954-1986 as a reference period, the impacts of human activity on runoff and sediment transport in the Huangfuchuan basin from 1987 to 2018 were 83.04% and 75.24%, respectively. The impact of precipitation change on runoff and sediment transport in the Huangfuchuan basin was 16.96% and 24.76%, respectively. Further, reduced runoff capacity contributed more than 85% to changes in sediment transport. Precipitation change and human activities are both important factors influencing reduced runoff and sediment in the Huangfuchuan basin. Increasing human activities in the basin are the main factors reducing runoff and sediment transport in the Huangfuchuan basin, with reduced precipitation caused by climate change as a secondary factor.

Key words: Huangfuchuan basin, precipitation, human activities, runoff, sediment runoff

LIU Qiang,YU Feihong,CHANG Kangfei,WANG Rui,JING Yuanning,MU Xingmin. Characteristics of water and sediment variation in the Huangfuchuan basin and its influencing factors[J].Arid Zone Research, 2021, 38(6): 1506-1513.

Figures/Tables 11

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References 18

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时期	平均值/mm	变异系数 (C_v)	极值比 (EVR)
1954—1969年	470.68	0.37	3.39
1970—1986年	398.72	0.25	2.47
1987—2001年	373.03	0.26	2.31
2002—2018年	444.68	0.29	2.75
1954—2018年	419.78	0.30	2.73

时期	径流量			输沙量
时期	平均值/10⁸ m³	变异系数(C_v)	极值比(EVR)	平均值/10⁸ t	变异系数(C_v)	极值比(EVR)
1954—1969年	2.07	0.64	12.36	0.61	0.80	32.75
1970—1986年	1.58	0.56	6.76	0.53	0.63	14.13
1987—2001年	0.92	0.75	17.92	0.29	1.07	44.04
2002—2018年	0.34	1.01	21	0.06	1.39	41.48
1954—2018年	1.23	0.74	14.51	0.37	0.97	33.05

时期	实测径流量 /10⁸ m³	计算径流量 /10⁸ m³	实测年降水量		降水影响		人类活动影响
时期	实测径流量 /10⁸ m³	计算径流量 /10⁸ m³	减少量 /10⁸ m³	百分比 /%	减少量 /10⁸ m³	百分比 /%	减少量 /10⁸ m³	百分比 /%
1954—1986年	58.13	60.20	-	-	-	-	-	-
1987—2018年	20.12	51.68	38.01	65.38	6.45	16.96%	31.56	83.04%

时期	实测输沙量 /10⁸t	计算输沙量 /10⁸t	实测年降水量		降水影响		人类活动影响
时期	实测输沙量 /10⁸t	计算输沙量 /10⁸t	减少量 /10⁸ t	百分比 /%	减少量 /10⁸ t	百分比 /%	减少量 /10⁸ t	百分比 /%
1954—1986年	18.33	18.63	-	-	-	-	-	-
1987—2018年	5.77	15.23	12.56	68.52	3.11	24.76%	9.45	75.24%

因子	1954—2018年	1954—1986年	1986—2018年
P/(%·a^-1)	-0.07	-0.09	-0.06
f/(%·a^-1)	0.42	0.49	0.33
s/(%·a^-1)	0.14	0.17	0.09
总计	0.49	0.54	0.36

Characteristics of water and sediment variation in the Huangfuchuan basin and its influencing factors

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