衢江水沙变化趋势分析
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P33

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国家自然科学基金(41401011)


Trend analysis of runoff and sediment load variation in Qujiang River
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    摘要:

    以衢州水文站以上流域为研究区域,基于衢江衢州水文站1958—2006年径流量和输沙量序列,采用Mann-Kendall趋势检验法、Sens坡度检验法、累加滤波器法与双累积曲线法,探讨近50年来衢江径流量和输沙量的变化趋势以及水沙关系的变化特征,并分析引起水沙序列变化的可能影响因素。结果表明:衢江年径流量无明显的变化趋势,而枯水月份(8月至次年1月)的径流量呈现显著增大的趋势,丰水月份中5月的径流量则呈现减小的趋势。输沙量变化趋势较为明显,自1980年以来衢江输沙量呈显著减小的趋势。从降水情况、水库拦沙和水土流失的治理状况等方面分析了引起衢江水沙变化的原因,提出衢江流域内水库所发挥的“蓄丰补枯”补水调节作用可能造成了径流量的变化,而水库建设与水土保持措施可能是流域输沙量减小的重要原因。

    Abstract:

    Taking the Qujiang River Basin above the Quzhou Hydrological Station as the study site, the characteristics of the annual runoff and sediment load during the period from 1958 to 2006 were analyzed based on the hydro-data of the Quzhou Hydrological Station. The variation trends and features of runoff and sediment load in the study period were investigated using the Mann-Kendall trend test, Sen s slope method, cumulative filter method, and double mass curve method, and the influencing factors were analyzed. The results indicate that there was no significant change in the time series of annual runoff, while the runoff in the dry season(from August to January of the next year)showed a significant increasing trend and the runoff in the flood season(in May)showed a significant decreasing trend. The annual sediment load had shown a significant decreasing trend since 1980. The major factors correlated with the runoff and sediment load changes such as precipitation, sediment detention in reservoirs, and soil conservation were also analyzed. Water replenishing and regulating from the reservoirs in the Qujiang River Basin might cause the changes of runoff. The construction of reservoirs and implementation of soil conservation measures were the main factors that resulted in the decrease of sediment load in the basin.

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宋逸云,黄峰.衢江水沙变化趋势分析[J].水资源保护,2017,33(4):40-46.(SONG Yiyun, HUANG Feng. Trend analysis of runoff and sediment load variation in Qujiang River[J]. Water Resources Protection,2017,33(4):40-46.(in Chinese))

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  • 收稿日期:2016-11-26
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  • 在线发布日期: 2017-07-12
  • 出版日期: 2017-07-20