河口河槽季节性冲淤变化及其对河流来水来沙响应的统计分析——以长江口南槽为例  

The Statistical Analysis of Response of the River Mouth Passage to Water and Sediment Discharges from the Changjiang River

作　　者：赵庆英[1] 杨世伦[2] 朱骏[2] 

机构地区：[1]国家海洋局第二海洋研究所,浙江杭州310012 [2]华东师范大学河口海岸国家重点实验室,上海200062

出　　处：《地理科学》2003年第1期112-117,共6页Scientia Geographica Sinica

基　　金：国家自然科学基金资助项目 (编号 :40 0 760 2 7);教育部高校骨干教师资助计划项目 ("淤泥质潮间带短期冲淤过程及其主控因子")部分成果。

摘　　要：利用长江口南槽 1989年 12个月的实测地形图和大通站相应的水沙资料 ,采用GIS技术和数理统计技术分析了南槽的地形变化与河流来水来沙的关系。结果表明 :南槽水深与大通站各月平均流量、输沙率和含沙量之间有明显的相关性 ,说明河口冲淤对流域水沙变化有敏感响应 ;河槽的响应具有 1～ 1.5月的滞后性。Based on the data of the south passage of the Changjiang River Mouth and the data of water and sediment in Datong Gauging Station, and with the technology of GIS and mathematical statistics, this article analyzed the relationship of the change of the topography of south passage in the Changjiang River Mouth and water and sediment discharges from the Cangjiang River. The results are as follows: (1) There is a law of accretion in flood season and erosion in dry season in the south passage of the Changjiang River Mouth. The mean thickness of erosion and accretion is biggest in August and smallest in March. The biggest thickness of accretion is in August and the biggest thickness of erosion is in December. (2) There is good negative correlation between the monthly mean water depth in the south passage and the monthly mean riverine discharge, the monthly mean rate of the sediment discharge and the monthly mean suspended sediment concentration. The correlation is best when the monthly mean water depth is lagged about one month or one and half months from the monthly mean riverine discharges, the monthly mean rate of the sediment discharge and the monthly mean suspended sediment concentration. The reason may be that there is a distance about 640 km from Datong Gauging Station to the estuary and it must take some time for the river to reach the estuary from Datong Gauging Station. In fact, the negative correlation between the monthly mean depth and the monthly mean riverine discharge is false,for there is evident positive correlation between the riverine discharges, the rate of sediment discharge and the suspended sediment concentration. (3) In their correlation, the correlation between the monthly mean depth and the monthly mean suspended sediment concentration is best and the correlation between the monthly mean depth and the monthly mean riverine discharge is worst. This shows that the factor of sediment is more important than that of water for the erosion and accretion in the river passage. (4) According to the exami

关 键 词：GIS 河海相互作用 长江口 统计分析 地理信息系统 地形 

分 类 号：TV148[水利工程—水力学及河流动力学]