摘要
本文根据渭河下游华县站水文资料研究了多沙河流中河流离子含量与水沙变化之间的关系。研究发现,河流离子含量与流量的对数呈显著负相关关系。河流中悬移质泥沙含量小于20kg m3时,随泥沙浓度的升高,离子含量降低;而在悬移质泥沙含量大于20kg m3时,二者之间则呈正相关关系。在汛期和非汛期,河流离子含量与水沙变化之间表现出不同的关系。在汛期河流离子含量与水沙变化的关系较为复杂,这种复杂关系是与流域内土壤侵蚀,特别是高含沙水流出现有关。进一步分析发现在汛期河流的离子含量是悬移质泥沙和水流共同作用的结果,而在非汛期河流离子含量取决于水流。
Ionic concentration in river flow reflects the chemical denudation in river basin. In this paper the relationship between ionic concentration and variation of flow-sediment in lower Weihe River is analyzed according to the data obtained at Huaxian hydrological station. It is found that the ionic concentration is negatively related to flow discharge of the river and decreases with the increase of the concentration of suspended sediment if the concentration of suspension is lower than 20kg/m^3. The relationship is very complicated during flood season due to the heavy erosion especially when hyper-concentrated flow is happened. Further analysis shows that in flood season the ionic concentration in flow is the result of combined effect due to flow and sediment, but it depends upon the flow discharge only in dry season.
出处
《水利学报》
EI
CSCD
北大核心
2004年第8期54-58,共5页
Journal of Hydraulic Engineering
基金
国家自然科学基金项目(50109006)
中国科学院地理科学与资源研究所知识创新工程领域前沿项目(CXIOG A00 05 01)
关键词
离子含量
悬移质含沙量
流量
汛期
非汛期
ionic concentration
concentration of suspended sediment
discharge
flood season
dry season
