Variation of ecological water demand and its contributing factors in the southern three outlets of Jingjiang River in the Yangtze River under the condition of hydrologic variation

doi:10.13287/j.1001-9332.201708.029

Abstract

Abstract: Based on the measured original runoff data series at five hydrological stations in the southern three outlets of Jingjiang River in the Yangtze River from 1951 to 2015, variation years of runoff were tested by Mann-Kendall methods. Instream ecological water demands in the southern three outlets of Jingjiang River were calculated through GEV’s maximum flow of probability density. Spatial temporal variation of ecological water demand and its contributing factors were analyzed from the perspective of multi temporal and spatial scales. The results showed that, in the studied periods, the first variation years of runoff were respectively 1990, 1959, 1959, 1972 and 1972 at five hydrological Stations of Xinjiangkou, Shadaoguan, Kangjiagang, Guanjiapu and Mituosi. The monthly average flow sequence before the first variation was used as the hydrological sequence before hydrological variation. Under the conditions of hydrological variation, the ecological water demands each month were respectively 69.63, 26.15, 55.65, 452.65, 2166.44, 4660.83, 10875.66, 9966.49, 7868.38, 4773.60, 1655.01 and 338.49 m³·s^-1 from January to December. The average annual ecological water demands in the five hydrological stations of Xinjiangkou, Shadaoguan, Kangjiagang, Guanjiapu and Mituosi were 901.57, 507.00, 221.30, 1438.03 and 581.62 m³·s^-1 respectively. After the hydrologic variation, the frequency of meeting instream ecological water demand decreased significantly from more than 55% before the hydrologic variation to less than 20% after the hydrologic variation in the three outlets of southern Jingjiang River, and the shortage of ecological water demand became very serious. The main factors affecting the spatial and temporal changes of ecological water demand in the southern three outlets of Jingjiang River in the Yangtze River were human activities of water conservancy projects in the different periods and water consumption in different industries.

HE Meng, LYU Dian-qing, LI Jing-bao, DAI Wen, XU Zhi. Variation of ecological water demand and its contributing factors in the southern three outlets of Jingjiang River in the Yangtze River under the condition of hydrologic variation[J]. Chinese Journal of Applied Ecology, 2017, 28(8): 2554-2562.

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