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9140.3×10^(4t),平均离子总量为202.7mg/l,离子流量为2898kg/s,离子径流模数为90.9t/km^2;初步分析了这些离子径流特征值的时空变化特征。
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 90.9 t/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 133 t/km2·a. The smallest value, which is only 62 t/km2 · a, occurs in Jinshajiang River and yagongjiang River basins in the western part of the studied area.
出处
《地理研究》
CSSCI
CSCD
北大核心
1991年第4期19-28,共10页
Geographical Research
关键词
离子
径流量
时空变化
模数
径流
chemical flow, corrosion, total amount of transported ions, modulus of chemical flow
