地理研究 ›› 1991, Vol. 10 ›› Issue (4): 19-28.doi: 10.11821/yj1991040003

• 论文 • 上一篇    下一篇

长江上游离子径流量的估算及时空变化特征

许越先, 谢明, 张永忠   

  1. 中国科学院、国家计划委员会地理研究所
  • 收稿日期:1990-12-20 修回日期:1991-07-24 出版日期:1991-12-15 发布日期:1991-12-15

CALCULATION OF AMOUNT OF THE CHEMICAL FLOW AT THE UPPER REACHES OF CHANGJIANG RIVER AND ANATYSIS OF ITS TEMPORAL AND SPATIAL VARIATION

Xu Yuexian, Xie Ming, Zhang Yongzhong   

  1. Institute of Geography, Chinese Academy of Sciences and State Planning Commission of the People's Republic of China
  • Received:1990-12-20 Revised:1991-07-24 Online:1991-12-15 Published:1991-12-15

摘要: 离子径流是河流水文要素之一。本文估算了流域侵蚀强度较大的长江上遊地区的离子径流量为9140.3×104t,平均离子总量为202.7mg/l,离子流量为2898k's,离子径流模数为90.9t'km2;初步分析了这些离子径流特征值的时空变化特征。

关键词: 离子径流量, 离子总量, 离子径流模数, 侵蚀强度, 时空变化

Abstract: Erosion at the upper reaches of Changjiang River is intensive.It is of significance to study the chemical flow and the corrosion in this area for analysing the composition and the chemical characteristics of the suspended materials in the Changjiang River and the Chemical and physical processes in this river system.The annual average content of ions at the upper reaches of Changjiang (Yichang Station)is estimated to be 202.7mg/1. The discharge of ions is 2898.kg/s. The total amount of transported ions is 91.403 million tons, accounting for 61.7% of the total amount in the Changjiang River Basin and 26.5% of the total amount of transported ions in China. The intensity of corrosion can be reflected by the modulus of chemical flow. The average modulus of chemical flow at the upper reaches of Changjiang River is 90.9t/km2·a, which is higher than the country's average.The highest value occurs in the wujiang River Basin in the southern section of the studied area, which is 133t/km2·a. The smallest value, which is only 62t/km2·a, occurs in Jinshajiang River and yagongjiang River basins in the western part of the studied area.

Key words: chemical flow, corrosion, total amount of transported ions, modulus of chemical flow