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首页> 外文会议>International Yellow River forum on ecological civilization and river ethics;2009 IYRF >Annual Evolving Laws of the Sediment in Jialing River Runoff during Past 50 Years and its Driving Factors
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Annual Evolving Laws of the Sediment in Jialing River Runoff during Past 50 Years and its Driving Factors

机译：近50年来嘉陵江流域泥沙年变化规律及其驱动因素。

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Annual runoff of discharge and sediment loads of hydrological gauging station of the Jialing River from 1956 to 2006 were analyzed in this paper by using Mann-Kendall trend analysis and average difference T test method. The result indicates that the annual runoff of discharge does not show significant trend at >95% confidence level while the annual sediment load appears significant decrease trend in recent 50 years (this decreasing trend is significant at >95% confidence level). Moreover, with the method of Value Difference t-test, it was concluded that the history of annual discharge change in the Jialing River could be divided into two periods, 1956～1992 and 1993～2006, with a decrement of 184.73×108 m3; the history of annual sediment load change could be divided into four periods, 1956～1967,1968～1984,1985～1988,1989～1993, and 1993～2000; the average annual sediment loads during four periods above are 1.81×108 t, 1.35×108 t, 0.71×108 t,0.34×108 t, respectively; and the decrements of each stage sediment load are 0.46×108 t,0.64×108 t,0.37×108 t, respectively. This result is consistent with the results of the double cumulative curve. The driving factors that cause the sediment load variation was analyzed from two aspects of nature factors and human activities. Results show that water reservoirs exerted more influences on changes of sediment loads than on runoff, which is the main reason for the decreasing trend of sediment loads.
机译：运用Mann-Kendall趋势分析和平均差T检验方法，对嘉陵江水文测站1956年至2006年的年径流量和泥沙量进行了分析。结果表明，在> 95％置信度下，年径流量没有显着趋势，而在最近50年中，年沉积物负荷呈现出显着的下降趋势（在> 95％置信度下，这种下降趋势是显着的）。此外，采用价值差t检验的方法得出的结论是，嘉陵江年流量变化的历史可分为两个时期，分别为1956〜1992年和1993〜2006年，减量为184.73×108 m3。年度泥沙负荷变化的历史可分为四个时期：1956〜1967、1968〜1984、1985〜1988、1989〜1993、1993〜2000。上述四个时期的年平均沉积物负荷分别为1.81×108 t，1.35×108 t，0.71×108 t，0.34×108 t。每个阶段的沉积物减量分别为0.46×108 t，0.64×108 t，0.37×108 t。该结果与双累积曲线的结果一致。从自然因素和人类活动两个方面分析了造成泥沙负荷变化的驱动因素。结果表明，水库对泥沙负荷变化的影响大于对径流量的影响，这是造成泥沙负荷下降趋势的主要原因。

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