Variation of Water-Sediment Relationship and the Driving Factors Above the Cuntan Station of the Yangtze River Main Stream in Recent 70 Years

doi:10.13870/j.cnki.stbcxb.2021.01.011

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Variation of Water-Sediment Relationship and the Driving Factors Above the Cuntan Station of the Yangtze River Main Stream in Recent 70 Years

更新时间：2025-03-12

- Variation of Water-Sediment Relationship and the Driving Factors Above the Cuntan Station of the Yangtze River Main Stream in Recent 70 Years
- Vol. 35, Issue 1, Pages: 79-84(2021)
- 作者机构：
  
  1. 长江科学院水土保持研究所,武汉,430010
  2. 水利部山洪地质灾害防治工程技术研究中心,武汉,430010
  3. 长江科学院科研计划处,武汉,430010
  4. 中南安全环境技术研究院股份有限公司,武汉,430071
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.01.011
  CLC：
- Published：2021
- 稿件说明：
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Variation of Water-Sediment Relationship and the Driving Factors Above the Cuntan Station of the Yangtze River Main Stream in Recent 70 Years[J]. 2021, 35(1): 79-84.
DOI：

Variation of Water-Sediment Relationship and the Driving Factors Above the Cuntan Station of the Yangtze River Main Stream in Recent 70 Years[J]. 2021, 35(1): 79-84. DOI： 10.13870/j.cnki.stbcxb.2021.01.011.

摘要

以长江干流寸滩水文站以上流域为研究对象，基于1953-2018年的实测水沙资料，采用线性回归、Mann-Kendall趋势检验和水沙关系曲线分析径流、输沙的时间趋势及其关系变化，并采用双累积曲线法分析水沙变化的驱动因素。结果表明：寸滩站以上流域多年平均径流量为3 425亿m

，多年平均输沙量为3.61亿t；多年平均月径流量为294.8亿m

，多年平均月输沙量为3 013万t，且主要分布在6-10月，分别占年径流泥沙总量的70%和95%以上。趋势分析显示，流域年降雨量和径流量变化趋势不明显，年输沙量呈极显著减小趋势；月径流量在1-4月显著增加，其他月份变化不显著，而各月输沙量均呈显著减少趋势。水沙关系曲线均可用幂函数拟合，拟合参数受时间尺度影响，统计检验显示悬移质输沙量实测值与水沙关系曲线的估算值差异不显著。双累积曲线分析发现水利工程建设和水土保持等人类活动是寸滩水文站输沙减少的主要原因，其作用占69%~93%，其中2000年以来人类活动的贡献超过90%。

Abstract

Based on the measured runoff and sediment data of Cuntan hydrologic station that at upper situating Yangtze River's main stream

this study analyzed the temporal trends of runoff and sediment transport as well as the variations of their relationships during 1953-2018 by statistical methods including linear regression

Mann-Kendall test

and sediment rating curve. Double mass curve was further used to analyze the driving factors of water and sediment variation. The results showed that the average annual water and sediment discharge of Cuntan station was 342.5 billion m

and 361 million tons

respectively. The average monthly water and sediment discharge was 29.48 billion m

and 30.13 million

tons

respectively

which mainly distributed in June to October

accounting for more than 70% and 95% of the total annual runoff and sediment

respectively. The trend analysis indicated that the variation trends of annual precipitation and runoff were not obvious

however

annual sediment discharge showed a significantly decreasing trend. The monthly runoff increased significantly from January to April and the changes in other months were not significant

while the monthly sediment discharge showed a significantly decreasing trend in each month. In this study

the relationships between water and sediment could be fitted by power functios

and the fitting parameters were affected by the time scale. Statistical test detected that there was no significant difference between the measured value suspended sediment load and the estimated values by sediment rating curve. Double mass curve analysis found that human activities

such as water conservancy construction and soil and water conservation

were the main factors driving the sediment reduction in Cuntan station

accounting for 69%~93% in different decades

among which human activities had contributed more than 90% since 2000.

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