| 郑 沛,钟 亮,赵瑜健.长江上游宜宾至重庆河段水沙情势变化特征*[J].水运工程,2025,(1):113-121 |
| 长江上游宜宾至重庆河段水沙情势变化特征* |
| Change characteristics in water and sediment conditions in upper reaches of the Yangtze River from Yibin to Chongqing |
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| DOI： |
| 中文关键词: 长江上游 径流量 输沙量 趋势性 突变性 周期性 变化特征 |
| 英文关键词:upper Yangtze River runoff sediment load trend mutability cyclicity change characteristics |
| 基金项目:重庆市基础科学与前沿技术研究项目（cstc2017jcyjAX0278） |
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| 中文摘要: |
| 长江上游宜宾至重庆河段是长江黄金航道的重要组成部分，在自然因素和人为因素的综合作用下，该河段近期水沙情势发生了一定变化。基于长江朱沱站、寸滩站（简称“两站”）1956—2020年的径流量和悬移质输沙量原型观测资料，分析长江宜宾至重庆河段的水沙趋势性、突变性和周期性变化特征，结果表明：1）朱沱站径流量呈上升趋势，寸滩站径流量呈下降趋势，但均不显著；两站输沙量均呈异常显著下降趋势。2）两站径流量和输沙量均出现突变特征，径流量突变发生在1960—1969年，2000年以来也存在径流量突变情况；而输沙量的突变主要发生在2000年至今。3）朱沱站径流量在28 a的时间尺度下周期震荡最剧烈，径流变化的平均周期约为19 a，相当于经历了3.5个丰水期和枯水期的转换；输沙量在93 a时间尺度下，呈现出明显的周期性，径流变化的平均周期约为57 a；寸滩站径流量序列中，14、28、47 a时间尺度下，周期性变化较明显，寸滩站输沙量变化的主周期约为93 a。 |
| 英文摘要: |
| The upper reaches of the Yangtze River from Yibin to Chongqing is an important part of the Yangtze River's golden waterway,and under the combined effect of natural and human factors,the water and sediment conditions in this section has changed to some extent recently.The trend of runoff and sediment,mutability and cyclic change characteristics of the Yibin to Chongqing section of the Yangtze River are analyzed,based on the prototype observation data of runoff and suspended sediment transport from 1956 to 2020 at the Zhutuo and Cuntan stations of the Yangtze River ( abbreviated as two stations ).The results show that:1) The runoff at Zhutuo station shows an increasing trend,the runoff at Cuntan station shows a decreasing trend,but neither is significant.The sediment load at both stations show an unusually significant decreasing trend.2) Runoff and sediment load of the two stations have mutation characteristics,runoff mutation occurs from 1960 to1969,and runoff mutation also exists since 2000,and the mutation of sediment load mainly occurs from 2000 to now.3) Runoff at Zhutuo station has the most drastic cyclic oscillations under the 28 years time scale.The average cycle of runoff change is about 19 years,which is equivalent to experiencing the conversion of 3.5 water-abundance periods and dry periods.The sand content shows obvious cyclicity under the 93 years time scale,and the average cycle of runoff change is about 57 years.In the sequence of runoff at Cuntan station,the cyclic changes are more obvious under the time scales of 14,28,and 47 years,and the main cycle of the change of the sediment load at Cuntan station is about 93 years. |
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