摘要
对荆江监利河段的水沙特性进行了初步概括，以期抛砖引玉。根据监利河段代表水文站一监利水文站多年统计资料（1950－2006年），监利河段年径流量变化过程与年输沙量变化过程均呈不规则周期性变化，水沙过程变幅略大，2006年为长江枯水少沙年份，径流量、输沙量均为历年来最低值。河段径流量年内分配与输沙量基本一致，均集中于汛期5～10月。通过分析可知，监利河段来水来沙总体呈正相关性，即径流量越大，输沙量也就越大，而2000年以来年径流量序列与年输沙量序列无相关性，河段输沙量呈现明显减少趋势。监利河段的水沙变化除了受长江上游来水来沙变化的影响外，下荆江裁弯工程、荆江三口分流分沙变化、三峡工程等水利枢纽建设及洞庭湖出流顶托等，均是主要影响因素。
Jianli river reach is the key river reach of lower Jingjiang river （the middle reach of Changjiang River）. In this paper, the characteristics of water and sediment load of Jianli river reach was summarized preliminaryly. By analyzing the 1950-2006 prototype data of representative hydrological station-Jianli station in Jianli river reach, results and conclusions would come to as follows. The annual runoff and sediment load of Jianli river reach all changed irregularly and periodically, and have a little large amplitude of variation. In 2006, the annual runoff and sediment load of Jianli river are the lowest in the past years. The distribution of runoff and sediment load in one year is uneven,mainly concentrated in flood season from May to October. The runoff and sediment load have direct correlation on the whole, that is, the more the runoff, the more the sediment load. While since 2000, the annual runoff and sediment load have no correlation, and the annual sediment load showed an obvious decreasing tendency. Besides the incoming water and sediment from the upstreem river reach, the cut-off works in lower Jingjiang river reach, the variation of the flow division through three branches in J ingjiang river, the construction of large-scale water conservancy projects, such as TGP, the jacking action by the outflow of Dongting lake,are all the main influencing factors of water and sediment load variation in Jianli river reach.
出处
《中国农村水利水电》
北大核心
2009年第2期26-29,共4页
China Rural Water and Hydropower
基金
"十一五"国家科技支撑计划"三峡工程运用后泥沙与防洪关键技术研究"之课题3"三峡工程运用后初期长江中下游干流河道响应过程及江湖关系变化研究"(课题编号:2006BAB05B03)
关键词
长江
监利河段
水沙变化
相关分析
影响因素
Changjiang River
Jianli river reach
water and sediment load variation
correlation analysis
influencing factor
