塔布河流域潜在蒸散量时空变化特征及成因

doi:10.13866/j.azr.2024.09.10

Abstract

Abstract:

Potential evapotranspiration (ET₀) has an important impact on the hydrological cycle of the Tabu River Basin. Temporal and spatial variations in ET₀ values in response to meteorological factors can inform water resource management in basins. For this study, daily meteorological data were collected from 7 meteorological stations in the Tabu River Basin and surrounding areas from 1981 to 2023. The Penman-Monteith (P-M) formula was used to estimate the ET₀ to analyze temporal and spatial distribution patterns. The Beven sensitivity formula was used to calculate the sensitivity coefficient of seasonal and annual changes in ET₀ to key meteorological factors and to explore trends in the sensitivity coefficient. Quantitative analysis was performed to determine the dominant factors affecting ET₀ changes based on the relative changes in meteorological factors over time. The annual ET₀ in the Tabu River Basin increased by 4.09 mm·(10a)^-1, with a multiyear average of 1024.51 mm. Spatially, the annual ET₀ was lowest in the southeast and highest in the northwest. The absolute values of the sensitivity coefficient of annual ET₀ to various meteorological factors in decreasing order are relative humidity>maximum temperature>wind speed>sunshine hours>minimum temperature. The coefficients for relative humidity were highest for spring, autumn, and winter, while temperature had the highest coefficient for summer. The main factors affecting the change in annual ET₀ were maximum temperature and wind speed, with contributions of 4.86% and-4.37%, respectively. On a seasonal scale, the main factors affecting ET₀ changes in spring, summer, autumn, and winter were maximum temperature, wind speed, and relative humidity. An increase in maximum temperature and a decrease in relative humidity in the basin are the main reasons for the rise in ET₀.

Key words: potential evapotranspiration, P-M equation, sensitivity coefficient, contribution rate, Tabu River Basin

WANG Jiashuang, GAO Xiaoyu, LI Weiping, CHI Zhaonan, ZHANG Jiapeng, WU Yixuan. Spatial-temporal variation characteristics and attribution analysis of potential evapotranspiration in the Tabu River Basin[J].Arid Zone Research, 2024, 41(9): 1538-1547.

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References 28

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时段	春季		夏季		秋季		冬季		年
时段	ET₀均值/mm	Z值	ET₀均值/mm	Z值	ET₀均值/mm	Z值	ET₀均值/mm	Z值	ET₀均值/mm	Z值
1981—1996年	320.93	-1.17	446.10	-1.98	190.18	-0.27	57.58	2.70	1014.79	-1.89
1997—2023年	328.42	1.98	453.45	-0.23	190.50	-1.15	60.13	-0.06	1030.27	0.15
1981—2023年	325.63	1.56	450.71	0.16	190.38	-0.76	59.18	1.43	1024.51	0.83

季节	评价指标	气象要素
季节	评价指标	最高气温	最低气温	相对湿度	日照时数	风速
春季	敏感系数均值	0.34	0.03	-0.37	0.21	0.21
春季	倾向率	0.01	0	0.02	0	0.01^*
夏季	敏感系数均值	0.44	0.03	-0.40	0.30	0.16
夏季	倾向率	0	0.05	0.02	0	0.01^*
秋季	敏感系数均值	0.32	0.03	-0.73	0.29	0.13
秋季	倾向率	0	-0.01	0.01	0	0.01^*
冬季	敏感系数均值	0.23	0.08	-1.04	0.02	0.32
冬季	倾向率	0.01	-0.11	0.05^**	0	0.01^*
年	敏感系数均值	0.33	0.04	-0.63	0.16	0.24
年	倾向率	0.01	-0.02	0.03^*	0	0.01^*

气象要素	春季		夏季		秋季		冬季		年
气象要素	多年相对变化率	贡献率	多年相对变化率	贡献率	多年相对变化率	贡献率	多年相对变化率	贡献率	多年相对变化率	贡献率
最高气温	18.75	6.38	6.74	2.97	13.52	4.33	18.50	4.26	14.74	4.86
最低气温	132.97	3.99	10.71	0.32	86.30	2.59	-1.10	-0.09	52.43	2.10
相对湿度	-10.91	4.04	-4.46	1.78	1.24	-0.91	-8.15	8.48	-5.16	3.25
日照时数	-3.78	-0.79	-5.22	-1.57	-6.70	-0.87	-1.28	-0.03	-4.17	-0.67
风速	-16.93	-3.55	-20.26	-3.24	-17.50	-5.08	-16.18	-5.18	-18.22	-4.37

	最高气温		最低气温		相对湿度		日照时数		风速
	多年相对变化率	贡献率	多年相对变化率	贡献率	多年相对变化率	贡献率	多年相对变化率	贡献率	多年相对变化率	贡献率
四子王旗	15.14	4.95	48.59	0.66	-5.04	3.28	-4.59	-0.75	-12.76	-3.23
希拉穆仁	14.81	5.04	46.87	5.57	-3.56	2.73	-2.70	-0.44	-28.24	-6.28
达茂旗	14.18	5.25	172.69	21.76	-10.41	5.76	-4.13	-0.57	-30.18	-8.79
固阳县	8.69	2.77	156.18	16.20	-3.72	1.85	-12.26	-2.03	10.61	2.79
武川县	11.34	3.34	144.21	15.72	-10.83	6.49	-0.98	-0.16	-9.31	-2.14
满都拉	11.16	4.90	194.5	31.91	-11.89	6.81	-12.91	-1.51	-20.66	-6.51
察右中旗	19.10	5.63	58.33	7.59	-9.88	7.55	5.27	0.90	16.39	3.23

Spatial-temporal variation characteristics and attribution analysis of potential evapotranspiration in the Tabu River Basin

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